2a6792ae01
moved varibles passed from vbr to .data section
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this is to work around having to save them without .bss ready
2024-12-19 15:18:28 -05:00
2c5e5ccbee
might have fixed some of the boot_drive issues with ext_read
2024-12-19 13:13:46 -05:00
38bcd93ced
some debuging text for fat32 stuff
2024-10-15 20:37:49 -04:00
e085cbbab7
remove jmp short init at the start of stage2
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also correct total size output as combined .data + .text
2024-10-15 18:33:57 -04:00
915ac4c8ae
align to 16 byte bounds and add git info to build
2024-10-15 18:28:06 -04:00
e65220fece
correct size of operand in PrintDWORD
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added some magic debug points for stuff that isn't working as well.
2024-10-15 13:32:36 -04:00
47a47051b2
turn off magic debug in mbr/vbr stages
2024-10-15 13:31:32 -04:00
8e2ca06406
removed bpb_offset_bx dep
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reworked init: process
512 byte stack...should be more than enough for the vbr
2024-10-15 12:57:54 -04:00
2b9d0d9946
moved stack to end of bss & reduced size for now.
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removed redzone label
reordered sp/bp setup and bss zeroing in init:
fixed kmemcpy call stack usage
2024-10-15 12:56:12 -04:00
1ce3f67263
reduced stack size in mbr stage
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removed some unused data in bss
reordered how/when in init we set sp/bp and zero bss
we now push the top of the stack pointer/bp at the top of the stack, which makes the stack frame more 'normal'
also use movsb instead of movsw
2024-10-15 12:53:22 -04:00
ad2d37c63b
use bochs magic breakpoints in the error printer
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makes it easier to get a good state to do some investigating before reseting.
2024-10-13 20:53:13 -04:00
e4b9c5d77f
added partition_table and fat32_bpb params to stage2
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also the partition table and fat32_bpb and passed/copied from the mbr/vbr now
2024-10-13 17:54:06 -04:00
e3a646675f
bss for vbr stage
2024-10-13 17:52:28 -04:00
9d33469e32
fixed bss init in mbr
2024-10-13 17:52:09 -04:00
dd1a74bff0
pass location of partition_table structure to vbr
2024-10-13 16:41:39 -04:00
832141efb4
bss convertion for mbr stage
2024-10-13 16:36:11 -04:00
c919144496
turns out huge unreal mode isn't supported in bochs
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huge unreal mode is 4GiB code in 16bit mode + 4GiB data
we will just use the regular big flat model instead (64KiB code/4GiB data)
2024-10-13 14:50:49 -04:00
a62f3de26f
unreal gdt tweaks & fixes
2024-10-13 13:22:01 -04:00
bd40d6d324
relocate code sections to end up with stage2 starting at 0x500
2024-10-12 22:14:47 -04:00
d1f8ec4a9e
follow standard proceedure and reallocate the mbr to 0x600
2024-10-12 21:21:43 -04:00
2fa03c31d7
partially roll back changing the segment to 0x07E0
2024-10-12 20:25:04 -04:00
f535840572
big step...and also its completely broken right now
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we are going to use 0x07E0 as our base segment so we have a bit
more memory to work with until we are fully in 32bit protected mode.
this commit is broken but is just one step towards a working release.
2024-10-12 15:41:39 -04:00
276fe70572
use early_mem.inc
2024-10-12 15:38:47 -04:00
31c45051e6
minor cleanup related to memory refactor
2024-10-12 12:57:56 -04:00
a523e17d27
moved stuff that is only referenced in Stage2 to stage2 bss
2024-10-12 12:55:29 -04:00
65e5a83eb4
stage2 is now a multisection binary file
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also preparing to move memory globals to bss section.
2024-10-12 11:29:20 -04:00
cd048933ec
output symbol maps to ease debuging
2024-10-12 11:28:25 -04:00
60aaf5cdd9
move far jump setup in EnterUnrealMode to right after we save CS
2024-10-11 21:51:07 -04:00
075e51c8bc
move macro definition super early
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fix a few mistakes in macro defs
2024-10-11 19:31:31 -04:00
48cd0f742d
added macros to define cstr and str
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aligned all the entry points for proceedures to 4 bytes
added a PrintString wraper macro
2024-10-11 19:05:15 -04:00
e5fb1b41eb
added bochs debug wrappers
2024-10-11 19:03:27 -04:00
802d47fbf7
fix passing stage2 wrong data for boot drive
2024-10-11 13:09:17 -04:00
056551fdd1
rename file to BOOT.BIN
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K.I.S.S.
2024-10-11 12:16:01 -04:00
00daf92df5
unreal gdt now has 2 selectors 1 code, 1 data
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ss, and e/f/g segments are loaded to the same flat 4gb segment
moved gdt notes to documentation
2024-10-08 20:22:21 -04:00
6ae68d1a19
ensure 2 byte jmp rel8 thunk to init
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surpress reloc abs warnings
corrected include paths/filenames
2024-10-08 08:55:17 -04:00
4218a08658
force the first jump to init in all stages to be the rel8 version
2024-10-07 20:39:39 -04:00
2bbdaddb68
jmp imm32 vs jmp rel8 (5 bytes vs 2 bytes)
2024-10-06 21:46:32 -04:00
213ea11209
cutting out everything from miniboot
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this file has always just been a place holder to get some code to load from the disk
I wanted to cut out all the extra stuff in it just to simplify things down.
2024-10-06 18:52:20 -04:00
e41b597056
surpress some of the relocation warnings for mbr, vbr & stage2
2024-10-06 18:50:32 -04:00
145e9fbaa9
fixed read_disk_raw in ReadFATCluster
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boot_drive and partition_offset are global pointers now
removed an extra error from mbr disk read
and some general formating and cleanup 😅
2024-10-05 20:14:00 -04:00
8f95c8f267
tons more work on modularizing the code
2024-10-05 18:55:00 -04:00
5440a1ae61
more modularization and updating date in MIT licence header
2024-10-05 13:35:39 -04:00
a4fa48949c
Move fat32 and BIOS functions to their own files
2024-10-05 12:04:40 -04:00
e162e268c4
remove the dword stack macros and just use the 32bit override
2024-10-05 10:13:18 -04:00
62f036b645
change test kernel stage name
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also pointed up a bug in memory.inc
2024-10-04 22:17:35 -04:00
d93236d298
some bpb/ebpb tweaks
2024-10-04 11:48:25 -04:00
3f029e6b4c
vbr cdecl overhaul
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refactored read_disk_raw to read_stage2_raw
switched to new kmem functions
2024-10-04 09:56:41 -04:00
30c4f1b82c
move cdecl macros to nearly the top so early functions can use them
2024-10-04 09:55:45 -04:00
597132df9f
cdecl16 overhaul for mbr code
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switch to cdecl kmem* functions
refactored read_disk_raw to read_vbr_raw
fixed a small issue where the mbr wasn't checking its signature
2024-10-04 09:55:19 -04:00
36b8869140
add bpb and ebpb reserve area back to vbr.nasm
2024-10-03 21:00:02 -04:00
