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Merge branch 'fat32_sys_rewrite' into trunk

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Elaina Claus
2025-08-22 11:52:48 -04:00
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@@ -7,3 +7,4 @@ bx_enh_dbg.ini
stevia-log stevia-log
.vscode/ .vscode/
*.map *.map
compose-dev.yaml

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into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

27
LICENSE.md
View File

@@ -1,19 +1,14 @@
Copyright (c) 2023 Elaina Claus Copyright (C) 2025 Elaina Claus
Permission is hereby granted, free of charge, to any person obtaining a copy This program is free software: you can redistribute it and/or modify
of this software and associated documentation files (the "Software"), to deal it under the terms of the GNU General Public License as published by
in the Software without restriction, including without limitation the rights the Free Software Foundation, either version 3 of the License, or
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell (at your option) any later version.
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all This program is distributed in the hope that it will be useful,
copies or substantial portions of the Software. but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR You should have received a copy of the GNU General Public License
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, along with this program. If not, see <https://www.gnu.org/licenses/>.
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

15
Makefile
View File

@@ -1,3 +1,18 @@
# Copyright (C) 2025 Elaina Claus
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
include := './include' include := './include'
mbr_source_files := $(wildcard src/mbr/*.nasm) mbr_source_files := $(wildcard src/mbr/*.nasm)

21
bochsrc.bxrc
View File

@@ -1,20 +1,18 @@
# configuration file generated by Bochs # configuration file generated by Bochs
plugin_ctrl: voodoo=false, unmapped=true, biosdev=true, speaker=true, extfpuirq=true, parallel=true, serial=true, busmouse=false, e1000=false, es1370=false, gameport=true, ne2k=false, sb16=false, usb_uhci=false, usb_ohci=false, usb_ehci=false, usb_xhci=false plugin_ctrl: voodoo=false, unmapped=true, biosdev=true, speaker=true, extfpuirq=true, parallel=true, serial=true, busmouse=false, e1000=false, es1370=false, gameport=true, iodebug=true, ne2k=false, sb16=false, usb_uhci=false, usb_ohci=false, usb_ehci=false, usb_xhci=false
config_interface: win32config config_interface: win32config
display_library: win32 display_library: win32
memory: guest=64, host=64, block_size=128 memory: guest=64, host=64, block_size=128
romimage: file="C:\Program Files\Bochs-2.8\BIOS-bochs-latest", address=0x00000000, options=none, flash_data=none romimage: file="C:\Program Files\Bochs-2.8\BIOS-bochs-legacy", address=0x00000000, options=none, flash_data=none
vgaromimage: file="C:\Program Files\Bochs-2.8\VGABIOS-lgpl-latest" vgaromimage: file="C:\Program Files\Bochs-2.8\VGABIOS-lgpl-latest"
boot: disk boot: disk
floppy_bootsig_check: disabled=0 floppy_bootsig_check: disabled=1
floppya: type=1_44 floppya: type=1_44
# no floppyb # no floppyb
ata0: enabled=true, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14 ata0: enabled=true, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
ata0-master: type=disk, path=".\disk.img", mode=flat, cylinders=0, heads=0, spt=0, sect_size=512, model="Stevia Disk", biosdetect=auto, translation=lba ata0-master: type=disk, path=".\disk.img", mode=flat, cylinders=0, heads=16, spt=63, sect_size=512, model="Stevia Disk", biosdetect=auto, translation=auto
ata0-slave: type=none ata0-slave: type=none
ata1: type=none ata1: enabled=false
ata1-master: type=none
ata1-slave: type=none
ata2: enabled=false ata2: enabled=false
ata3: enabled=false ata3: enabled=false
optromimage1: file=none optromimage1: file=none
@@ -29,7 +27,10 @@ pci: enabled=1, chipset=i440fx, slot1=none, slot2=none, slot3=none, slot4=none,
vga: extension=vbe, update_freq=10, realtime=1, ddc=builtin vga: extension=vbe, update_freq=10, realtime=1, ddc=builtin
cpu: count=1, ips=1000000, model=p3_katmai, reset_on_triple_fault=1, cpuid_limit_winnt=0, ignore_bad_msrs=1, mwait_is_nop=0 cpu: count=1, ips=1000000, model=p3_katmai, reset_on_triple_fault=1, cpuid_limit_winnt=0, ignore_bad_msrs=1, mwait_is_nop=0
print_timestamps: enabled=0 print_timestamps: enabled=0
port_e9_hack: enabled=false, all_rings=false debugger_log: -
magic_break: enabled=1
port_e9_hack: enabled=true, all_rings=false
iodebug: all_rings=0
private_colormap: enabled=0 private_colormap: enabled=0
clock: sync=none, time0=local, rtc_sync=0 clock: sync=none, time0=local, rtc_sync=0
# no cmosimage # no cmosimage
@@ -43,9 +44,9 @@ keyboard: type=mf, serial_delay=150, paste_delay=100000, user_shortcut=none
mouse: type=none, enabled=false, toggle=ctrl+mbutton mouse: type=none, enabled=false, toggle=ctrl+mbutton
sound: waveoutdrv=dummy, waveout=none, waveindrv=dummy, wavein=none, midioutdrv=dummy, midiout=none sound: waveoutdrv=dummy, waveout=none, waveindrv=dummy, wavein=none, midioutdrv=dummy, midiout=none
speaker: enabled=true, mode=sound, volume=15 speaker: enabled=true, mode=sound, volume=15
parport1: enabled=true, file=none parport1: enabled=false
parport2: enabled=false parport2: enabled=false
com1: enabled=true, mode=null com1: enabled=false
com2: enabled=false com2: enabled=false
com3: enabled=false com3: enabled=false
com4: enabled=false com4: enabled=false

27
include/BIOS/BIOS_SYS.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%include 'BIOS/func/a20enable.nasm' %include 'BIOS/func/a20enable.nasm'
%include 'BIOS/func/E820_memory_map.nasm' %include 'BIOS/func/E820_memory_map.nasm'

27
include/BIOS/func/E820_memory_map.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_E820MEMORY_MAP %ifndef __INC_E820MEMORY_MAP

27
include/BIOS/func/a20enable.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_A20ENABLE %ifndef __INC_A20ENABLE
; ;

36
include/BIOS/func/ext_read.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_EXT_READ %ifndef __INC_EXT_READ
;Offset Size Description ;Offset Size Description
@@ -98,15 +93,20 @@ read_disk_raw:
mov ax, [bp + 12] mov ax, [bp + 12]
mov word [bx + LBAPkt_t.xfer_size], ax mov word [bx + LBAPkt_t.xfer_size], ax
mov eax, [bp + 8] mov eax, dword [bp + 8]
mov dword [bx + LBAPkt_t.lower_lba], eax mov dword [bx + LBAPkt_t.lower_lba], eax
; upper_lba is zero from kmemset
; TODO: possiblly support >32bit LBA addresses in the future, this limits us to 4GiB
mov ax, [bp + 6] mov ax, [bp + 6]
mov word [bx + LBAPkt_t.offset], ax mov word [bx + LBAPkt_t.offset], ax
movzx ax, byte [bp + 4] mov ax, [bp + 4]
mov word [bx + LBAPkt_t.segment], ax mov word [bx + LBAPkt_t.segment], ax
xor ax, ax
xor dx, dx
mov si, bx ; ds:si LBAPkt_t mov si, bx ; ds:si LBAPkt_t
mov ah, 0x42 ; call # mov ah, 0x42 ; call #
mov dl, byte [bp + 14] ; drive # mov dl, byte [bp + 14] ; drive #

27
include/BIOS/func/video.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_VIDEO %ifndef __INC_VIDEO
; Sets output to 80x25 16 color text mode via BIOS call ; Sets output to 80x25 16 color text mode via BIOS call

42
include/cdecl16.inc
View File

@@ -1,22 +1,18 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifnmacro __CDECL16_ENTRY %ifnmacro __CDECL16_ENTRY
%macro __CDECL16_ENTRY 0 %macro __CDECL16_ENTRY 0
push bp push bp
@@ -55,3 +51,17 @@
pop ax pop ax
%endmacro %endmacro
%endif %endif
%ifnmacro __FASTCALL16_ENTRY
%macro __FASTCALL16_ENTRY 0
push bp
mov bp, sp
%endmacro
%endif
%ifnmacro __FASTCALL16_EXIT
%macro __FASTCALL16_EXIT 0
mov sp, bp
pop bp
%endmacro
%endif

27
include/config.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_STEVIA_CONFIG %ifndef __INC_STEVIA_CONFIG

27
include/early_mem.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_EARLY_MEM %ifndef __INC_EARLY_MEM

27
include/entry.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_ENTRY %ifndef __INC_ENTRY

29
include/error_codes.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_ERROR_CODES %ifndef __INC_ERROR_CODES
@@ -63,7 +58,7 @@
%define STAGE2_FAT32_NCLUS_CFDIVZ 'K' %define STAGE2_FAT32_NCLUS_CFDIVZ 'K'
%define STAGE2_FAT32_CLS2LBA_CF 'L' %define STAGE2_FAT32_CLS2LBA_CF 'L'
%define STAGE2_FAT32_INIT_CF 'M' %define STAGE2_FAT32_INIT_CF 'M'
%define STAGE2_ERROR_RESERVED_N 'N' %define STAGE2_ERROR_INFOPRINTER 'N'
%define STAGE2_ERROR_RESERVED_O 'O' %define STAGE2_ERROR_RESERVED_O 'O'
%define STAGE2_ERROR_RESERVED_P 'P' %define STAGE2_ERROR_RESERVED_P 'P'
%define STAGE2_ERROR_RESERVED_Q 'Q' %define STAGE2_ERROR_RESERVED_Q 'Q'

205
include/fat32/FAT32_SYS.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_FAT32_SYS %ifndef __INC_FAT32_SYS
@@ -24,6 +19,8 @@
%include "fat32/bpb_offset_bx.inc" %include "fat32/bpb_offset_bx.inc"
%include "fat32/fat32_structures.inc" %include "fat32/fat32_structures.inc"
; Clobbers: eax, edx
; returns: none
ALIGN 4, db 0x90 ALIGN 4, db 0x90
InitFATDriver: InitFATDriver:
__CDECL16_ENTRY __CDECL16_ENTRY
@@ -38,44 +35,64 @@ InitFATDriver:
sub sp, 0x6 sub sp, 0x6
.calc_active_part: .calc_active_part:
mov bx, [partition_offset_ptr] mov ax, word [partition_offset]
mov ax, word [ds:bx] mov di, fat32_state
mov dx, partition_table mov dx, partition_table
add dx, ax ; dx points to the partition that was booted from add dx, ax ; dx points to the partition that was booted from
mov bx, dx ; set bx, should point at our partition mov bx, dx ; set bx, should point at our partition
mov eax, dword [bx + PartEntry_t.lba_start] mov eax, dword [bx + PartEntry_t.lba_start]
mov dword [fat32_state + FAT32_State_t.active_drive_lba_32], eax mov dword [di + FAT32_State_t.curr_drive_lba_32], eax
mov si, fat32_bpb
mov bx, fat32_ebpb
.calc_first_fat: .calc_first_fat:
movzx eax, word [fat32_bpb + FAT32_bpb_t.reserved_sectors_16] ; first fat from start of partition movzx eax, word [si + FAT32_bpb_t.reserved_sectors_word] ; first fat from start of partition
add eax, dword [fat32_state + FAT32_State_t.active_drive_lba_32] ; calculate offset from start of drive add eax, dword [di + FAT32_State_t.curr_drive_lba_32] ; calculate offset from start of drive
jc InitFATDriver.error
mov dword [fat32_state + FAT32_State_t.first_fat_sector_32], eax mov dword [di + FAT32_State_t.first_fat_sector_32], eax
.calc_total_fat: .calc_total_fat:
mov ebx, dword [fat32_ebpb + FAT32_ebpb_t.sectors_per_fat_32] mov edx, dword [bx + FAT32_ebpb_t.FATSz_dword]
movzx eax, byte [fat32_bpb + FAT32_bpb_t.fat_count_8] movzx eax, byte [si + FAT32_bpb_t.fat_count_byte]
mul ebx ; result in EDX:EAX, CF set on > 32bit return value mul edx ; result in EDX:EAX, CF set on > 32bit return value
jc InitFATDriver.error ; as a catch for unhandled overflow, just error if value is greater than 32bits jc InitFATDriver.error ; as a catch for unhandled overflow, just error if value is greater than 32bits
mov dword [fat32_state + FAT32_State_t.fat_size_32], eax mov dword [di + FAT32_State_t.fat_size_32], eax
.calc_first_data: .calc_first_data:
mov edx, dword [fat32_state + FAT32_State_t.first_fat_sector_32] mov edx, dword [di + FAT32_State_t.first_fat_sector_32]
add eax, edx add eax, edx
jc InitFATDriver.error
mov dword [fat32_state + FAT32_State_t.first_data_sector_32], eax mov dword [di + FAT32_State_t.first_data_sector_32], eax
.get_first_root_dir: .set_first_dir:
mov eax, [fat32_ebpb + FAT32_ebpb_t.root_dir_cluster_32] mov eax, dword [bx + FAT32_ebpb_t.root_clus_dword]
mov dword [fat32_state + FAT32_State_t.first_root_dir_sector_32], eax ; this only works when 1 cluster = 1 sector mov dword [di + FAT32_State_t.curr_dir_cluster_32], eax
mov dword [fat32_state + FAT32_State_t.active_dir_cluster_32], eax
.endp: .endp:
__CDECL16_EXIT __CDECL16_EXIT
ret ret
.error: .error:
ERROR STAGE2_FAT32_INIT_CF ERROR STAGE2_FAT32_INIT_CF
ALIGN 4, db 0x90
FSInfoPrinter:
__CDECL16_ENTRY
.func:
;info we want to print to validate we are loading stuff from the disk correctly
; boot_drive # (i.e 0x80)
; active/bootable partition info (lba_start, lba_length, part_type)
; BPB Info: BS_OEMName = ident_8, BPB_BytsPerSec = bytes_per_sector_16, BPB_SecPerClus = sectors_per_cluster_8
; eBPB info: FATSz_dword, volid, vol label
;
; print entire FAT32 state
;
.endp:
__CDECL16_EXIT
ret
.error:
ERROR STAGE2_ERROR_INFOPRINTER
; this involves using the low memory buffer for the bios call and moving the file sector by sector to high memory ; this involves using the low memory buffer for the bios call and moving the file sector by sector to high memory
; ;
; SFN is a 8.3 file name, all uppercase, and padded with spaces ; SFN is a 8.3 file name, all uppercase, and padded with spaces
@@ -89,10 +106,10 @@ ALIGN 4, db 0x90
SearchFATDIR: SearchFATDIR:
__CDECL16_ENTRY __CDECL16_ENTRY
.file_lookup: .file_lookup:
print_string SearchFATDIR_INFO_cstr print_string SearchFATDIR_info
mov bx, fat32_state
.load_first_dir: .load_first_dir:
mov eax, dword [fat32_state + FAT32_State_t.active_dir_cluster_32] mov eax, dword [bx + FAT32_State_t.curr_dir_cluster_32]
push dword eax ; cluster push dword eax ; cluster
mov ax, dir_buffer mov ax, dir_buffer
push ax ; offset push ax ; offset
@@ -108,19 +125,19 @@ SearchFATDIR:
; if eax >= 0x0FFFFFF8 then there are no more clusters (end of chain) ; if eax >= 0x0FFFFFF8 then there are no more clusters (end of chain)
; if eax == 0x0FFFFFF7 then this is a cluster that is marked as bad ; if eax == 0x0FFFFFF7 then this is a cluster that is marked as bad
mov eax, dword [fat32_state + FAT32_State_t.active_dir_cluster_32] mov eax, dword [bx + FAT32_State_t.curr_dir_cluster_32]
push dword eax push dword eax
call NextCluster ; uint32_t NextCluster(uint32_t active_cluster); call NextCluster ; uint32_t NextCluster(uint32_t active_cluster);
add sp, 0x4 add sp, 0x4
cmp eax, 0x0fff_fff7 cmp eax, 0x0fff_fff7
je SearchFATDIR.bad_cluster ;je SearchFATDIR.bad_cluster ; TODO: Implement Bad cluster checks
jb SearchFATDIR.load_next_dir_next_OK jb SearchFATDIR.load_next_dir_next_OK
ERROR STAGE2_FAT32_END_OF_CHAIN ERROR STAGE2_FAT32_END_OF_CHAIN
.load_next_dir_next_OK: .load_next_dir_next_OK:
; load 512 bytes of directory entries from data sector ; load 512 bytes of directory entries from data sector
mov eax, [fat32_state + FAT32_State_t.active_dir_cluster_32] mov eax, [bx + FAT32_State_t.curr_dir_cluster_32]
push dword eax ; cluster push dword eax ; cluster
mov ax, dir_buffer mov ax, dir_buffer
@@ -157,8 +174,9 @@ SearchFATDIR:
jae SearchFATDIR.load_next_dir jae SearchFATDIR.load_next_dir
jmp SearchFATDIR.empty_dir_entry jmp SearchFATDIR.empty_dir_entry
; TODO: move this to a seperate string search function
.parse_dir: .parse_dir:
print_string MaybeFound_Boot_INFO_cstr print_string MaybeFound_Boot_info
.lfn_check: .lfn_check:
; check for ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID (0x0F) in offset 11 ; check for ATTR_READ_ONLY | ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME_ID (0x0F) in offset 11
; TODO: going to skip LFN for now, since all valid volumes will have SFN's ; TODO: going to skip LFN for now, since all valid volumes will have SFN's
@@ -170,7 +188,7 @@ SearchFATDIR:
mov cx, 0xA ; max of 11 filename length of 11 characters mov cx, 0xA ; max of 11 filename length of 11 characters
; si points to the start of the current directory entry ; si points to the start of the current directory entry
mov di, BootTarget_str ; current memory location (8.3 name is at offset 0) mov di, BootTarget ; current memory location (8.3 name is at offset 0)
repe cmpsb ; compare the strings repe cmpsb ; compare the strings
pop di pop di
@@ -194,48 +212,44 @@ ALIGN 4, db 0x90
NextCluster: NextCluster:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
print_string NextFATCluster_INFO_cstr print_string NextFATCluster_info
mov ax, FAT32_NextClusterData_t_size
push ax ; length
xor ax, ax
push ax ; init with zero
mov ax, fat32_nc_data
push ax ; address of structure
call kmemset
sub sp, 0x6
mov edx, dword [bp + 4] mov edx, dword [bp + 4]
mov si, fat32_nc_data ; instead of push/pop and moving the data back mov si, fat32_nc_data ; instead of push/pop and moving the data back
mov di, fat32_bpb ; load si & di then use xchg mov di, fat32_bpb ; load si & di then use xchg
mov bx, fat32_state
.calc_offset: .calc_offset:
; fat_offset = active_cluster * 4 ; fat_offset = active_cluster * 4
mov eax, 4 mov eax, 4
mul edx mul edx
jc NextCluster.error_cfdivz jc NextCluster.error_cfdivz
mov dword [si + FAT32_NextClusterData_t.fat_offset], eax ; move lower 32 bits to fat offset mov dword [si + FAT32_NextClusterData_t.fat_offset], eax ; move lower 32 bits to fat offset
.calc_fat_sector: .calc_fat_sector:
; fat_sector = first_fat_sector + (fat_offset / sector_size) ; fat_sector = first_fat_sector + (fat_offset / sector_size)
; entry_offset = fat_offset % sector_size ; entry_offset = fat_offset % sector_size
mov edx, 0xffff_0000 xor edx, edx
and edx, eax movzx ecx, word [di + FAT32_bpb_t.bytes_per_sector_word]
shr edx, 16 cmp eax, 0
xchg si, di ; switch to fat32_bpb in si
mov cx, word [si + FAT32_bpb_t.bytes_per_sector_16]
xchg si, di
cmp edx, 0
je NextCluster.error_cfdivz je NextCluster.error_cfdivz
div cx ; DX:AX / cx = fat_sector - first_fat_sector in AX div ecx ; eDX:eAX / eCX = fat_sector - first_fat_sector in eAX
; DX = remainder (fat_offset mod sector_size) ; eDX = remainder (fat_offset mod sector_size)
mov ecx, 0x0000_ffff
and edx, ecx
mov dword [si + FAT32_NextClusterData_t.entry_offset], edx mov dword [si + FAT32_NextClusterData_t.entry_offset], edx
mov ecx, dword [bx + FAT32_State_t.first_fat_sector_32]
xchg si, di ; switch to fat32_bpb in si
mov ecx, dword [si + FAT32_State_t.first_fat_sector_32]
xchg si, di
mov edx, 0x0000ffff
and eax, edx
add eax, ecx ; fat_sector + first_fat_sector add eax, ecx ; fat_sector + first_fat_sector
mov dword [si + FAT32_NextClusterData_t.fat_sector], eax mov dword [si + FAT32_NextClusterData_t.fat_sector], eax
.load_fat_table: .load_fat_table:
mov bx, word [boot_drive_ptr] xor ax, ax
movzx ax, byte [ds:bx] mov al, byte [boot_drive]
push ax push ax
mov ax, 0x1 mov ax, 0x1
@@ -250,20 +264,6 @@ NextCluster:
xor ax, ax xor ax, ax
push ax push ax
; BUG: something about this function causes this BIOS call to come back wrong
; somehow the drive number is being read in wrong, but I can't find evidence of it being modified or writen
; to memory incorrectly.
; 00007109574i[BIOS ] Booting from 0000:7c00
; 00007123227i[CPU0 ] [7123227] Stopped on MAGIC BREAKPOINT
; (0) Magic breakpoint
; Next at t=7123227
; (0) [0x000000000502] 0000:0502 (unk. ctxt): cli ; fa
; <bochs:2> c
; 00007252963i[BIOS ] int13_diskette: unsupported AH=42
; 00007253071i[CPU0 ] [7253071] Stopped on MAGIC BREAKPOINT
; (0) Magic breakpoint
; Next at t=7253071
; (0) [0x00000000095c] 0000:095c (unk. ctxt): mov al, 0x47 ; b047
call read_disk_raw call read_disk_raw
add sp, 0xC add sp, 0xC
; uint8_t read_stage2_raw(uint16_t buf_segment, uint16_t buf_offset, ; uint8_t read_stage2_raw(uint16_t buf_segment, uint16_t buf_offset,
@@ -280,52 +280,39 @@ NextCluster:
.error_cfdivz: .error_cfdivz:
ERROR STAGE2_FAT32_NCLUS_CFDIVZ ERROR STAGE2_FAT32_NCLUS_CFDIVZ
; uint32_t ClusterToLBA(uint32_t cluster)
ALIGN 4, db 0x90
ClusterToLBA:
__CDECL16_ENTRY
.func:
mov dword eax, [bp + 4]
sub eax, 2
movzx edx, byte [fat32_bpb + FAT32_bpb_t.sectors_per_cluster_8]
mul edx
jc ClusterToLBA.error
add eax, dword [fat32_state + FAT32_State_t.first_data_sector_32]
; eax contains the LBA now
.endp:
__CDECL16_EXIT
ret
.error:
ERROR STAGE2_FAT32_CLS2LBA_CF
; bp - 2 - byte boot_drive
; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster) ; uint8_t ReadFATCluster(uint16_t seg, uint16_t offset, uint32_t cluster)
ALIGN 4, db 0x90 ALIGN 4, db 0x90
ReadFATCluster: ReadFATCluster:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
print_string ReadFATCluster_INFO_cstr print_string ReadFATCluster_info
mov bx, word [boot_drive_ptr] mov bx, fat32_bpb
movzx ax, byte [ds:bx] mov si, fat32_ebpb
xor ax, ax
mov al, byte [boot_drive]
push ax push ax
mov ax, 0x1 ; count = 1 mov ax, 0x1 ; count = 1
push ax push ax
mov eax, dword [bp + 8] mov eax, dword [bp + 8] ; cluster
push dword eax sub eax, 2
call ClusterToLBA movzx edx, byte [bx + FAT32_bpb_t.sectors_per_cluster_byte]
add sp, 0x4 mul edx ; result in eax, error on carry
jc ReadFATCluster.error
add eax, dword [si + FAT32_State_t.first_data_sector_32]
jc ReadFATCluster.error
; eax contains the LBA now ; eax contains the LBA now
push dword eax ; lba = ClusterToLBA(..) push dword eax ; lba = ClusterToLBA(..)
mov ax, fat_buffer ; offset = fat_buffer (in mem.inc) mov ax, word [bp + 6] ; offset
push ax push ax
xor ax, ax ; segment = 0x0000, our buffer is in the first 64 KiB mov ax, word [bp + 4]
push ax push ax
; uint8_t read_stage2_raw(uint16_t buf_segment, uint16_t buf_offset, ; uint8_t read_disk_raw(uint16_t buf_segment, uint16_t buf_offset,
; uint32_t lba, ; uint32_t lba,
; uint16_t count, uint16_t drive_num) ; uint16_t count, uint16_t drive_num)
call read_disk_raw call read_disk_raw
@@ -333,6 +320,8 @@ ReadFATCluster:
.endp: .endp:
__CDECL16_EXIT __CDECL16_EXIT
ret ret
.error:
ERROR STAGE2_FAT32_CLS2LBA_CF
%endif %endif
%define __INC_FAT32_SYS %define __INC_FAT32_SYS

27
include/fat32/bpb_offset_bx.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_BPD_OFFSET_BX %ifndef __INC_BPD_OFFSET_BX

156
include/fat32/fat32_structures.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2023 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_FAT32_STRUCT %ifndef __INC_FAT32_STRUCT
@@ -63,20 +58,20 @@
; resulting in a value which does not fit in the Number of Sectors entry at 0x13. ; resulting in a value which does not fit in the Number of Sectors entry at 0x13.
struc FAT32_bpb_t struc FAT32_bpb_t
.reserved_init resb 3 .reserved_jmpboot resb 3
.ident_8 resb 8 .ident resb 8
.bytes_per_sector_16 resb 2 .bytes_per_sector_word resb 2
.sectors_per_cluster_8 resb 1 .sectors_per_cluster_byte resb 1
.reserved_sectors_16 resb 2 .reserved_sectors_word resb 2
.fat_count_8 resb 1 .fat_count_byte resb 1
.dir_entry_count_16 resb 2 .unused1_ZERO_word resb 2 ; Root entry count field, 0 on fat32
.sector_count_16 resb 2 .unused2_ZERO_word resb 2 ; total sectors size 16, 0 on fat32
.media_desc_8 resb 1 .media_desc_byte resb 1
.sectors_per_fat_16 resb 2 .unused3_ZERO_word resb 2 ; FAT size 16, 0 on fat32
.sectors_per_track_16 resb 2 .sectors_per_track_word resb 2
.head_count_16 resb 2 .head_count_word resb 2
.hidden_sectors_32 resb 4 .hidden_sectors_dword resb 4
.sector_count_32 resb 4 .total_sectors_dword resb 4
endstruc endstruc
; EBPB Information (FAT32) ; EBPB Information (FAT32)
@@ -96,19 +91,19 @@ endstruc
; 8 System identifier string. Always "FAT32 ". The spec says never to trust the contents of this string for any use. ; 8 System identifier string. Always "FAT32 ". The spec says never to trust the contents of this string for any use.
struc FAT32_ebpb_t struc FAT32_ebpb_t
.sectors_per_fat_32 resb 4 .FATSz_dword resb 4
.fat32_flags_16 resb 2 .extflags_word resb 2
.fat32_version_16 resb 2 .FSVersion_word resb 2
.root_dir_cluster_32 resb 4 .root_clus_dword resb 4
.fsinfo_sector_16 resb 2 .FSInfo_word resb 2
.backup_boot_sector_16 resb 2 .BkBootSec_word resb 2
.reserved1 resb 12 .reserved1 resb 12
.drive_number_8 resb 1 .drive_number_byte resb 1
.nt_flags_8 resb 1 .nt_flags_byte resb 1
.signature_8 resb 1 .signature_byte resb 1
.volume_serial_32 resb 4 .volume_id_dword resb 4
.volume_label resb 11 .volume_label_bytea resb 11
.system_ident resb 8 .system_ident_bytea resb 8
endstruc endstruc
; ## Standard 8.3 structure ### ; ## Standard 8.3 structure ###
@@ -134,19 +129,43 @@ endstruc
; 26 2 Low 16 bits of entry's first cluster ; 26 2 Low 16 bits of entry's first cluster
; 28 4 File size in bytes ; 28 4 File size in bytes
; FSInfo
; 0 0x0 4 Lead signature (must be 0x41615252 to indicate a valid FSInfo structure)
; 4 0x4 480 Reserved, these bytes should never be used
; 484 0x1E4 4 Another signature (must be 0x61417272)
; 488 0x1E8 4 Contains the last known free cluster count on the volume. If the value is 0xFFFFFFFF, then the free count is unknown and must be computed.
; However, this value might be incorrect and should at least be range checked (<= volume cluster count)
;
; 492 0x1EC 4 Indicates the cluster number at which the filesystem driver should start looking for available clusters.
; If the value is 0xFFFFFFFF, then there is no hint and the driver should start searching at 2.
; Typically this value is set to the last allocated cluster number. As the previous field, this value should be range checked.
;
; 496 0x1F0 12 Reserved
; 508 0x1FC 4 Trail signature (0xAA550000)
struc FAT32_FSInfo_t
.head_sig_dword resd 1 ; 0x41615252
.reserved1 resb 480 ; fill zero
.body_sig_dword resd 1 ; 0x61417272
.free_count_dword resd 1
.next_free_dword resd 1
.reserved2 resb 12 ; fill zero
.tail_sig_dword resd 1 ; 0xAA550000
endstruc
struc FAT32_SFN_t struc FAT32_SFN_t
.label resb 11 .label_83 resb 11
.attributes_8 resb 1 .attributes_byte resb 1
.nt_res_8 resb 1 .nt_res_byte resb 1
.csec_8 resb 1 .csec_byte resb 1
.ctime_16 resb 2 .ctime_word resb 2
.cdate_16 resb 2 .cdate_word resb 2
.adate_16 resb 2 .adate_word resb 2
.cluster_16_high resb 2 .cluster_16_high resb 2
.mtime_16 resb 2 .mtime_word resb 2
.mdate_16 resb 2 .mdate_word resb 2
.cluster_16_low resb 2 .cluster_16_low resb 2
.size_32 resb 4 .size_dword resb 4
endstruc endstruc
; ## Long file name (LFN) structure format ## ; ## Long file name (LFN) structure format ##
@@ -176,41 +195,14 @@ struc FAT32_LFN_t
.lfn_last2 resb 4 .lfn_last2 resb 4
endstruc endstruc
; FSInfo
; 0 0x0 4 Lead signature (must be 0x41615252 to indicate a valid FSInfo structure)
; 4 0x4 480 Reserved, these bytes should never be used
; 484 0x1E4 4 Another signature (must be 0x61417272)
; 488 0x1E8 4 Contains the last known free cluster count on the volume. If the value is 0xFFFFFFFF, then the free count is unknown and must be computed.
; However, this value might be incorrect and should at least be range checked (<= volume cluster count)
;
; 492 0x1EC 4 Indicates the cluster number at which the filesystem driver should start looking for available clusters.
; If the value is 0xFFFFFFFF, then there is no hint and the driver should start searching at 2.
; Typically this value is set to the last allocated cluster number. As the previous field, this value should be range checked.
;
; 496 0x1F0 12 Reserved
; 508 0x1FC 4 Trail signature (0xAA550000)
struc FAT32_FSInfo_t
.head_signature_32 resd 1
.reserved1 resb 480
.body_signature_32 resd 1
.free_cluster_count_32 resd 1
.first_avail_cluster_32 resd 1
.reserved2 resd 3
.tail_signature_32 resd 1
endstruc
; 32 bytes ; 32 bytes
struc FAT32_State_t struc FAT32_State_t
.first_root_dir_sector_32 resd 1
.first_data_sector_32 resd 1 .first_data_sector_32 resd 1
.first_fat_sector_32 resd 1 .first_fat_sector_32 resd 1
.fat_size_32 resd 1 .fat_size_32 resd 1
.active_cluster_32 resd 1 .curr_FAT_cluster_32 resd 1
.active_FAT_cluster_32 resd 1 .curr_dir_cluster_32 resd 1
.active_dir_cluster_32 resd 1 .curr_drive_lba_32 resd 1
.active_drive_lba_32 resd 1
endstruc endstruc
; 16 bytes ; 16 bytes

27
include/partition_table.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_PART_TABLE %ifndef __INC_PART_TABLE

27
include/util/bochs_magic.inc
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_BOCHS_DEBUG_MAGIC %ifndef __INC_BOCHS_DEBUG_MAGIC

27
include/util/error_func.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_ERROR_FUNC %ifndef __INC_ERROR_FUNC

37
include/util/kmem_func.nasm
View File

@@ -1,43 +1,38 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_KMEM_FUNC %ifndef __INC_KMEM_FUNC
%include 'cdecl16.inc' %include 'cdecl16.inc'
; uint8_t* kmemset_byte(void* dst, uint8_t val, uint16_t len); ; void* kmemset_byte(void* dst, uint8_t val, uint16_t len);
ALIGN 4, db 0x90 ALIGN 4, db 0x90
kmemset: kmemset:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
mov cx, [bp + 8] ; size_t len mov cx, [bp + 8] ; uint16_t len
mov al, [bp + 6] ; uint8_t val mov al, byte [bp + 6] ; uint8_t val
mov di, [bp + 4] ; void * dst mov di, [bp + 4] ; void * dst
cld cld
rep stosb rep stosb
mov ax, di ; return pointer to dest mov ax, di ; return pointer to dest + len (last elem of dest)
.endp: .endp:
__CDECL16_EXIT __CDECL16_EXIT
ret ret
; uint8_t* kmemset(uint8_t* dest, uint8_t* src, uint8_t len); ; uint8_t* kmemset(uint16_t* dest, uint16_t* src, uint16_t len);
; not overlap safe ; not overlap safe
ALIGN 4, db 0x90 ALIGN 4, db 0x90
kmemcpy: kmemcpy:

27
include/util/kmemcpy5_func.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_KMEMCPY5_FUNC %ifndef __INC_KMEMCPY5_FUNC
%include 'cdecl16.inc' %include 'cdecl16.inc'

27
include/util/kmemset4_func.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2024 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
%ifndef __INC_KMEMSET4_FUNC %ifndef __INC_KMEMSET4_FUNC
%include 'cdecl16.inc' %include 'cdecl16.inc'

31
scripts/create-disk.sh
View File

@@ -1,24 +1,19 @@
#!/usr/bin/env bash #!/usr/bin/env bash
# Copyright (c) 2023 Elaina Claus # Copyright (C) 2025 Elaina Claus
# #
# Permission is hereby granted, free of charge, to any person obtaining a copy # This program is free software: you can redistribute it and/or modify
# of this software and associated documentation files (the "Software"), to deal # it under the terms of the GNU General Public License as published by
# in the Software without restriction, including without limitation the rights # the Free Software Foundation, either version 3 of the License, or
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # (at your option) any later version.
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# #
# The above copyright notice and this permission notice shall be included in all # This program is distributed in the hope that it will be useful,
# copies or substantial portions of the Software. # but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# #
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # You should have received a copy of the GNU General Public License
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # along with this program. If not, see <https://www.gnu.org/licenses/>.
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
if ! [ $(id -u) = 0 ]; then if ! [ $(id -u) = 0 ]; then
echo "Script must be run as root!" >&2 echo "Script must be run as root!" >&2
@@ -170,7 +165,7 @@ elif [[ "$OSTYPE" == "darwin"* ]]; then
sfdisk_path="/usr/local/opt/util-linux/sbin/sfdisk" sfdisk_path="/usr/local/opt/util-linux/sbin/sfdisk"
if [ -e $mbr_file ] && [ -e $vbr_file ]; then if [ -e $mbr_file ] && [ -e $vbr_file ]; then
# use hdiutil to attach our empty disk image # use hdiutil to attach our empty disk image
ld_path_raw=$(hdiutil attach -readwrite -imagekey diskimage-class=CRawDiskImage -nomount -blocksize 512 -noverify disk.img) ld_path_raw=$(hdiutil attach -readwrite -imagekey diskimage-class=CRawDiskImage -nomount -blocksize 512 -noverify /tmp/disk.img)
ld=$(echo $ld_path_raw | sed s:/dev/::) ld=$(echo $ld_path_raw | sed s:/dev/::)
ld_path="/dev/$ld" ld_path="/dev/$ld"
@@ -193,7 +188,7 @@ elif [[ "$OSTYPE" == "darwin"* ]]; then
unset ld unset ld
unset ld_path_raw unset ld_path_raw
ld_path_raw=$(hdiutil attach -readwrite -imagekey diskimage-class=CRawDiskImage -nomount -blocksize 512 -noverify disk.img) ld_path_raw=$(hdiutil attach -readwrite -imagekey diskimage-class=CRawDiskImage -nomount -blocksize 512 -noverify /tmp/disk.img)
ld=$(echo $ld_path_raw | grep "FDisk_partition_scheme" | awk '{print $1}' | sed s:/dev/::) ld=$(echo $ld_path_raw | grep "FDisk_partition_scheme" | awk '{print $1}' | sed s:/dev/::)
ld_path="/dev/$ld" ld_path="/dev/$ld"

27
src/mbr/mbr.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2023 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
[BITS 16] [BITS 16]
[ORG 0x8C00] [ORG 0x8C00]

27
src/miniboot32/BOOTi686.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2023 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
[BITS 32] [BITS 32]
[ORG 0x100000] [ORG 0x100000]

190
src/stage2/stage2.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2023 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
[BITS 16] [BITS 16]
[ORG 0x0500] ; IF YOU CHANGE ORG CHANGE THE SIGN OFFSET AT THE END [ORG 0x0500] ; IF YOU CHANGE ORG CHANGE THE SIGN OFFSET AT THE END
@@ -49,15 +44,20 @@
section .text section .text
begin_text: begin_text:
; dl = byte boot_drive ; dl = byte boot_drive
; si = word part_offset (active partition offset) ; ax = word part_offset (active partition offset)
; bx = ptr PartTable_t partition_table ; si = ptr PartTable_t partition_table
; dx = ptr FAT32_bpb_t fat32_bpb ; di = ptr FAT32_bpb_t fat32_bpb
ALIGN 4, db 0x90 ALIGN 4, db 0x90
init: init:
__BOCHS_MAGIC_DEBUG
cli ; We do not want to be interrupted cli ; We do not want to be interrupted
mov ax, __STAGE2_SEGMENT ; set all our segments to the configured segment, excep es ; these 4 are stored in the .data section and are effectivly const types
mov [vbr_part_table_ptr], si ; pointer to partition_table
mov [vbr_fat32_bpb_ptr], di ; pointer to fat32_bpb
mov [boot_drive], dl ; copy boot_drive to globals
mov [partition_offset], ax ; copy partition_offset to globals
mov ax, __STAGE2_SEGMENT ; set all our segments to the configured segment, except es
mov ds, ax ; * mov ds, ax ; *
mov fs, ax ; * mov fs, ax ; *
mov gs, ax ; * mov gs, ax ; *
@@ -81,7 +81,7 @@ init:
mov sp, stack_top mov sp, stack_top
mov bp, sp mov bp, sp
sub sp, 0x20 sub sp, 0x10
push bp ; setup a somewhat normal stack frame, minus a ret ptr push bp ; setup a somewhat normal stack frame, minus a ret ptr
sti sti
@@ -121,22 +121,9 @@ struc EarlyBootStruct_t
.fat32_ebpb resb FAT32_ebpb_t_size .fat32_ebpb resb FAT32_ebpb_t_size
endstruc endstruc
; bp - 2 : byte boot_drive
; bp - 4 : word part_offset
; bp - 6 : ptr PartTable_t partition_table
; bp - 8 : ptr FAT32_bpb_t fat32_bpb
ALIGN 4, db 0x90 ALIGN 4, db 0x90
main: main:
lea ax, [bp - 2] __BOCHS_MAGIC_DEBUG
mov [boot_drive_ptr], ax
lea ax, [bp - 4]
mov [partition_offset_ptr], ax ; setup pointers to boot_drive and partition offset on stack
mov byte [bp - 2], dl ; boot_drive (probably 0x80)
mov word [bp - 4], si ; partition_offset
mov word [bp - 6], bx ; partition_table
mov word [bp - 8], dx ; fat32_bpb
.check_sig: .check_sig:
mov eax, dword [STAGE2_SIG] mov eax, dword [STAGE2_SIG]
cmp eax, 0xDEADBEEF cmp eax, 0xDEADBEEF
@@ -144,54 +131,54 @@ main:
ERROR STAGE2_SIGNATURE_MISSING ERROR STAGE2_SIGNATURE_MISSING
.stage2_main: .stage2_main:
mov ax, PartTable_t_size mov ax, PartTable_t_size
push ax ; len = PartTable_t_size
mov ax, word [vbr_part_table_ptr] ; src = ptr to vbr partition_table
push ax push ax
mov ax, [bp - 6] ; ptr partition_table mov ax, partition_table ; dst
push ax push ax
mov ax, partition_table call kmemcpy ; copy partition table data to .data section in stage2
push ax
call kmemcpy ; copy partition table data
add sp, 0x6 add sp, 0x6
mov ax, (FAT32_bpb_t_size + FAT32_ebpb_t_size) ; size in byte mov ax, (FAT32_bpb_t_size + FAT32_ebpb_t_size) ; len
push ax push ax
mov ax, [bp - 8] mov ax, word [vbr_fat32_bpb_ptr] ; src
push ax push ax
mov ax, fat32_bpb ; defined in memory.inc, destination mov ax, fat32_bpb ; dst
push ax push ax
call kmemcpy ; copy bpb & ebpb to memory call kmemcpy ; copy bpb & ebpb to memory
add sp, 0x6 add sp, 0x6
call SetTextMode call SetTextMode
call disable_cursor call disable_cursor
print_string HelloPrompt_cstr print_string HelloPrompt_info
; enable A20 gate ; enable A20 gate
call EnableA20 call EnableA20
print_string A20_Enabled_OK_cstr print_string A20_Enabled_OK_info
; enter unreal mode
call EnterUnrealMode
print_string UnrealMode_OK_cstr
; get system memory map ; get system memory map
call GetMemoryMap call GetMemoryMap
print_string MemoryMap_OK_cstr print_string MemoryMap_OK_info
; enter unreal mode
call EnterUnrealMode
print_string UnrealMode_OK_info
; FAT Driver setup ; FAT Driver setup
call InitFATDriver call InitFATDriver
print_string InitFATSYS_OK_cstr print_string InitFATSYS_OK_info
; ;
; Find first cluster of bootable file ; Find first cluster of bootable file
call SearchFATDIR call SearchFATDIR
push dword eax ; save first cluster of bootable file push dword eax ; save first cluster of bootable file
print_string FileFound_OK_cstr print_string FileFound_OK_info
pop dword eax pop dword eax
push dword eax ; print Cluster of boot file push dword eax ; print Cluster of boot file
call PrintDWORD ; void PrintDWORD(uint32_t dword) call PrintDWORD ; void PrintDWORD(uint32_t dword)
print_string NewLine_cstr add sp, 0x4
; TODO: using first cluster information, start loading the kernel to memory ; TODO: using first cluster information, start loading the kernel to memory
; TODO: going to need an elf parser, some unreal mode file buffer functions to move the data ; TODO: going to need an elf parser, some unreal mode file buffer functions to move the data
@@ -209,7 +196,7 @@ hcf:
ALIGN 4, db 0x90 ALIGN 4, db 0x90
PrintString: PrintString:
__CDECL16_ENTRY __CDECL16_ENTRY
mov di, [bp + 4] ; first arg is char* mov di, [bp + 4] ; first arg is char[]
.str_len: .str_len:
xor cx, cx ; ECX = 0 xor cx, cx ; ECX = 0
not cx ; ECX = -1 == 0xFFFF not cx ; ECX = -1 == 0xFFFF
@@ -243,10 +230,7 @@ ALIGN 4, db 0x90
PrintCharacter: PrintCharacter:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
mov ax, [bp + 4] ; c movzx ax, byte [bp + 4] ; AL = character c
mov dx, 0x00ff
and ax, dx
mov ah, 0x0E ; INT 0x10, AH=0x0E call mov ah, 0x0E ; INT 0x10, AH=0x0E call
mov bx, 0x0007 ; BH = page no. BL =Text attribute 0x07 is lightgrey font on black background mov bx, 0x0007 ; BH = page no. BL =Text attribute 0x07 is lightgrey font on black background
int 0x10 ; call video interrupt int 0x10 ; call video interrupt
@@ -261,7 +245,7 @@ ALIGN 4, db 0x90
PrintDWORD: PrintDWORD:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
lea si, [IntToHex_table] mov si, IntToHex_table
mov ebx, 16 ; base-16 mov ebx, 16 ; base-16
mov eax, dword [bp + 4] ;val mov eax, dword [bp + 4] ;val
@@ -374,40 +358,57 @@ begin_data:
; Strings ; Strings
; ;
; ############# ; #############
%define CRLF 0Dh, 0Ah
%macro define_str 2
ALIGN 16
%1_str:
db %2
%define str_len %strlen(%2) ; string
%1_str_len:
dd str_len
%endmacro
; TODO: technically this is a cstr but it splices a return and newline on the end
; TODO: this probably should be seperated out and the printing functionality should
; TODO: place that newline and return
%macro define_cstr 2 %macro define_cstr 2
%define CRLF_NUL 0Dh, 0Ah, 00h
ALIGN 16 ALIGN 16
%1_cstr: %1_cstr:
db %2, CRLF_NUL db %2, 00h
%endmacro %endmacro
define_cstr HelloPrompt, "Hello from Stevia Stage2!" %macro define_info 2
define_cstr A20_Enabled_OK, "A20 Enabled OK" ALIGN 16
define_cstr MemoryMap_OK, "Memory map OK" %1_info:
define_cstr UnrealMode_OK, "Unreal mode OK" db %2, CRLF, 00h
define_cstr FileFound_OK, "Found SFN entry for bootable binary, first cluster -> " %endmacro
define_cstr InitFATSYS_OK, "FAT32 Driver Init..."
define_cstr SearchFATDIR_INFO, "Searching FAT DIR for bootable file..." define_info HelloPrompt, "Hello from Stevia Stage2!"
define_cstr NextFATCluster_INFO, "Attempting to find next FAT cluster..." define_info A20_Enabled_OK, "A20 Enabled OK"
define_cstr ReadFATCluster_INFO, "Attempting to load next FAT" define_info MemoryMap_OK, "Memory map OK"
define_cstr MaybeFound_Boot_INFO, "Maybe found a file...checking..." define_info UnrealMode_OK, "Unreal mode OK"
define_cstr NewLine, "" define_info FileFound_OK, "Found SFN entry for bootable binary, first cluster -> "
define_info InitFATSYS_OK, "FAT32 Driver Init..."
define_str BootTarget, "BOOT BIN" define_info SearchFATDIR, "Searching FAT DIR for bootable file..."
define_info NextFATCluster, "Attempting to find next FAT cluster..."
define_info ReadFATCluster, "Attempting to load next FAT"
define_info MaybeFound_Boot, "Maybe found a file...checking..."
define_cstr BootTarget, "BOOT BIN"
ALIGN 16, db 0
BootTarget:
db 'BOOT BIN'
;
; pre-bss init globals (generally const...but there are exceptions)
;
align 8, db 0x00
boot_drive:
db 0x00
align 8, db 0x00
partition_offset:
dw 0x0000
align 8, db 0x00
vbr_fat32_bpb_ptr:
dw 0x0000
align 8, db 0x00
vbr_part_table_ptr:
dw 0x0000
ALIGN 16 ALIGN 16
IntToHex_table: IntToHex_table:
@@ -503,34 +504,29 @@ section .bss follows=.sign
begin_bss: begin_bss:
; structures ; structures
align 16, resb 1 align 8, resb 1
partition_table resb PartTable_t_size partition_table resb PartTable_t_size
align 16, resb 1 align 8, resb 1
fat32_bpb resb FAT32_bpb_t_size fat32_bpb resb FAT32_bpb_t_size
fat32_ebpb resb FAT32_ebpb_t_size fat32_ebpb resb FAT32_ebpb_t_size
align 16, resb 1 align 8, resb 1
fat32_nc_data resb 16 fat32_nc_data resb 16
align 16, resb 1 align 8, resb 1
lba_packet resb LBAPkt_t_size lba_packet resb LBAPkt_t_size
align 16, resb 1 align 8, resb 1
fat32_state: fat32_state:
resb FAT32_State_t_size resb FAT32_State_t_size
align 16, resb 1 align 8, resb 1
SteviaInfo: SteviaInfo:
resd 4 resd 4
; ;
; locals ; post-bss init globals
; ;
boot_drive_ptr:
resw 1
partition_offset_ptr:
resw 1
; ;
; large continuous allocations ; large continuous allocations

39
src/vbr/vbr.nasm
View File

@@ -1,22 +1,17 @@
; Copyright (c) 2023 Elaina Claus ; Copyright (C) 2025 Elaina Claus
; ;
; Permission is hereby granted, free of charge, to any person obtaining a copy ; This program is free software: you can redistribute it and/or modify
; of this software and associated documentation files (the "Software"), to deal ; it under the terms of the GNU General Public License as published by
; in the Software without restriction, including without limitation the rights ; the Free Software Foundation, either version 3 of the License, or
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell ; (at your option) any later version.
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
; ;
; The above copyright notice and this permission notice shall be included in all ; This program is distributed in the hope that it will be useful,
; copies or substantial portions of the Software. ; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
; ;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR ; You should have received a copy of the GNU General Public License
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, ; along with this program. If not, see <https://www.gnu.org/licenses/>.
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
; SOFTWARE.
[BITS 16] [BITS 16]
[ORG 0x7C00] [ORG 0x7C00]
[CPU KATMAI] [CPU KATMAI]
@@ -126,8 +121,8 @@ main:
.check_FAT_size: ; we only support a very specific setup of FAT32 .check_FAT_size: ; we only support a very specific setup of FAT32
mov bx, fat32_bpb mov bx, fat32_bpb
cmp dword [bx + FAT32_bpb_t.sector_count_32], 0 ; SectorsHuge will not be set if FAT12/16 test word [bx + FAT32_bpb_t.unused2_ZERO_word], 0 ; TotSectors16 will not be set if FAT32
ja main.load_stage2 jz main.load_stage2
ERROR VBR_ERROR_WRONG_FAT_SIZE ERROR VBR_ERROR_WRONG_FAT_SIZE
.load_stage2: .load_stage2:
; read sectors 1-(MAX_STAGE2_BYTES / 512) to stage2 entry point ; read sectors 1-(MAX_STAGE2_BYTES / 512) to stage2 entry point
@@ -152,10 +147,10 @@ main:
call read_disk_raw call read_disk_raw
add sp, 0xC add sp, 0xC
.enter_stage2: .enter_stage2:
mov dl, byte [bp - 2] ; boot_drive mov dl, byte [bp - 2] ; byte boot_drive
mov si, word [bp - 4] ; part_offset mov ax, word [bp - 4] ; word part_offset
mov bx, partition_table mov si, partition_table ; ptr partition_table
mov dx, fat32_bpb mov di, fat32_bpb ; ptr fat32_bpb
jmp word 0x0000:STAGE2_ENTRY jmp word 0x0000:STAGE2_ENTRY
; ############### ; ###############