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base: nivirx:1e9de446f0d8dc6321c732f75b6d313b24ad7c61
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nivirx:trunk nivirx:fat_v2 nivirx:fat32_sys_rewrite
nivirx:v0.0.1
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compare: nivirx:fat_v2
Branches Tags
nivirx:fat_v2 nivirx:trunk nivirx:fat32_sys_rewrite
nivirx:v0.0.1

3 Commits
1e9de446f0 ... fat_v2

Author SHA1 Message Date
Elaina Claus
4a944bc493 minor changes in fat32 2025-09-20 08:29:43 -04:00
Elaina Claus
137735431a move stack after bss padding 2025-09-18 19:16:27 -04:00
Elaina Claus
6caaf6aa6d some structures for okteta 
put in $(qtpaths --paths GenericDataLocation)
 2025-09-18 17:20:17 -04:00
7 changed files with 123 additions and 24 deletions
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24
docs/okteta/structures/mbr/main.osd Normal file
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@@ -0,0 +1,24 @@
<?xml version="1.0" encoding="UTF-8"?>
<data>
<struct name="MBR">
<!-- 446 bytes: bootstrap code -->
<array name="bootCode" length="446">
<primitive type="UInt8"/>
</array>
<!-- 4 x 16-byte partition entries -->
<array name="partitions" length="4">
<struct name="PartitionEntry">
<primitive name="status" type="UInt8"/> <!-- 0x80=bootable -->
<array name="chsFirst" length="3"><primitive type="UInt8"/></array>
<primitive name="type" type="UInt8"/>
<array name="chsLast" length="3"><primitive type="UInt8"/></array>
<primitive name="lbaStart" type="UInt32"/>
<primitive name="lbaSectors" type="UInt32"/>
</struct>
</array>
<!-- Signature 0x55AA (little-endian UInt16 == 0xAA55 on disk) -->
<primitive name="signature" type="UInt16"/>
</struct>
</data>

12
docs/okteta/structures/mbr/metadata.desktop Normal file
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@@ -0,0 +1,12 @@
[Desktop Entry]
Icon=application-x-executable
Type=Service
ServiceTypes=KPluginInfo
Name=Stevia MBR Structure
X-KDE-PluginInfo-Author=Elaina Claus
X-KDE-PluginInfo-Name=mbr
X-KDE-PluginInfo-Version=1.0
X-KDE-PluginInfo-Website=https://chtm.me
X-KDE-PluginInfo-Category=structure
X-KDE-PluginInfo-License=MIT
X-KDE-PluginInfo-EnabledByDefault=false

57
docs/okteta/structures/vbr/main.osd Normal file
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@@ -0,0 +1,57 @@
<?xml version="1.0" encoding="UTF-8"?>
<data>
<struct name="VBR">
<!-- 3 bytes: jmp over bpb code -->
<array name="jmpcode" length="3">
<primitive name="opcode" type="UInt8"/>
</array>
<array name="bs_ident" length="8">
<primitive type="Char"/>
</array>
<struct name="FAT32_bpb">
<primitive name="BytesPerSector" type="UInt16"/>
<primitive name="SectorsPerCluster" type="UInt8"/>
<primitive name="ReservedSectors" type="UInt16"/>
<primitive name="FatCount" type="UInt8"/>
<primitive name="RootEntryCount16" type="UInt16"/>
<primitive name="TotalSectors16" type="UInt16"/>
<primitive name="MediaDesc" type="UInt8"/>
<primitive name="FATSize16" type="UInt16"/>
<primitive name="SectorsPerTrack" type="UInt16"/>
<primitive name="HeadCount" type="UInt16"/>
<primitive name="HiddenSectors" type="UInt32"/>
<primitive name="TotalSectors32" type="UInt32"/>
</struct>
<struct name="FAT32_ebpb">
<primitive name="FATSize32" type="UInt32"/>
<primitive name="ExtFlags" type="UInt16"/>
<primitive name="FSVersion" type="UInt16"/>
<primitive name="RootDirCluster" type="UInt32"/>
<primitive name="FSInfoSector" type="UInt16"/>
<primitive name="BkBootSector" type="UInt16"/>
<array name="reserved0" length="12">
<primitive type="uint8"/>
</array>
<primitive name="DriveNumber" type="UInt8"/>
<primitive name="NtFlags" type="UInt8"/>
<primitive name="Signature" type="UInt8"/>
<primitive name="VolumeId" type="UInt32"/>
<array name="VolumeLabel" length="11">
<primitive type="Char"/>
</array>
<array name="FilesystemIdent" length="8">
<primitive type="Char"/>
</array>
</struct>
<array name="BootCode" length="420">
<primitive type="UInt8"/>
</array>
<!-- Signature 0xAA55 -->
<primitive name="signature" type="UInt16"/>
</struct>
</data>

12
docs/okteta/structures/vbr/metadata.desktop Normal file
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@@ -0,0 +1,12 @@
[Desktop Entry]
Icon=application-x-executable
Type=Service
ServiceTypes=KPluginInfo
Name=Stevia FAT32 VBR Structure
X-KDE-PluginInfo-Author=Elaina Claus
X-KDE-PluginInfo-Name=vbr32
X-KDE-PluginInfo-Version=1.0
X-KDE-PluginInfo-Website=https://chtm.me
X-KDE-PluginInfo-Category=structure
X-KDE-PluginInfo-License=MIT
X-KDE-PluginInfo-EnabledByDefault=false

9
include/fat32/FAT32_SYS.nasm
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@@ -126,11 +126,12 @@ FAT32_load_vbr:
; - fill fat32_bpb_t and compute derived fields
; - read FSInfo (free count/next free)
; - ???
; int fat32_mount(uint32_t partition_lba, fat32_bpb_t* out);
; int fat32_mount(FAT32_State_t* state, uint32_t partition_lba);
FAT32_mountfs:
__CDECL16_PROC_ENTRY
.proc:
; mount: parse BPB, derive fat0_lba, data_lba, cluster0_lba.
.endp:
__CDECL16_PROC_EXIT
ret
@@ -138,7 +139,7 @@ FAT32_mountfs:
ERROR STEVIA_DEBUG_ERR
; int fat32_read_fat(const fat32_bpb_t* v, uint32_t clus, uint32_t* out);
; int fat32_read_fat(FAT32_State_t* state, uint32_t clus, uint32_t* out);
FAT32_read_fat:
__CDECL16_PROC_ENTRY
.proc:
@@ -153,7 +154,7 @@ FAT32_read_fat:
; EOC if (val & 0x0FFFFFFF) >= 0x0FFFFFF8.
; bad if == 0x0FFFFFF7.
; free if == 0x00000000.
; int fat32_next_clus(const fat32_bpb_t* v, uint32_t clus, uint32_t* out_next);
; int fat32_next_clus(FAT32_State_t* state, uint32_t clus, uint32_t* out_next);
FAT32_next_cluster:
__CDECL16_PROC_ENTRY
.proc:
@@ -165,7 +166,7 @@ FAT32_next_cluster:
ERROR STEVIA_DEBUG_ERR
; e.g:
; uint64_t clus_to_lba(const fat32_bpb_t* v, uint32_t clus) {
; uint64_t clus_to_lba(FAT32_State_t* state, uint32_t clus) {
; return v->data_lba + (uint64_t)(clus - 2) * v->secs_per_clus;
; }
FAT32_clus_to_lba:

19
include/fat32/fat32_structures.inc
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@@ -195,20 +195,11 @@ endstruc
; 32 bytes
struc FAT32_State_t
.first_data_sector_32 resd 1
.first_fat_sector_32 resd 1
.fat_size_32 resd 1
.curr_FAT_cluster_32 resd 1
.curr_dir_cluster_32 resd 1
.curr_drive_lba_32 resd 1
endstruc
; 16 bytes
struc FAT32_NextClusterData_t
.fat_offset resd 1
.fat_sector resd 1
.entry_offset resd 1
.reserved_1 resd 1
.u32_TotalClusters resd 1
.u32_DataAreaStartSector resd 1
.u32_FATAreaStartSector resd 1
.p16_FATBuffer resw 1
.p16_ClustBuffer resw 1
endstruc
; FAT32 Attributes

14
src/stage2/stage2.nasm
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@@ -453,17 +453,19 @@ align 16, resb 1
%define BIOSMemoryMap_SIZE 1024
BIOSMemoryMap:
resb BIOSMemoryMap_SIZE
align 16, resb 1
stack_bottom:
resb 2048
stack_top:
end_bss:
; !!! End bss data !!!
%define STACK_SIZE 0x1000 ; 4 KiB
; Pad to the cap (emits nothing in the file; only increases .bss virtual size).
; If BSS_SIZE > BSS_MAX_BYTES, this becomes negative and NASM errors out.
%define BSS_MAX_BYTES 0x2000
%define BSS_MAX_BYTES (0x2000 - STACK_SIZE)
resb (BSS_MAX_BYTES - (end_bss - begin_bss))
align 16, resb 1
stack_bottom:
resb STACK_SIZE
stack_top:
; Optional: keep a label for later math:
bss_cap_end: