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changing names of values to match spec more

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also added prototype for FS info printer that will print some basic santity check type info.
This commit is contained in:
Elaina Claus
2024-10-17 07:50:37 -04:00
parent e33f010f73
commit e12ea89fda
3 changed files with 44 additions and 28 deletions
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16
include/fat32/FAT32_SYS.inc
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@@ -76,6 +76,22 @@ InitFATDriver:
.error:
ERROR STAGE2_FAT32_INIT_CF
ALIGN4, db 0x90
FSInfoPrinter:
__CDECL16_ENTRY
.func:
;info we want to print to validate we are loading stuff from the disk correctly
; BPB Info
; BS_OEMName = ident_8
; BPB_BytsPerSec = bytes_per_sector_16
; BPB_SecPerClus = sectors_per_cluster_8
;
.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
;
; SFN is a 8.3 file name, all uppercase, and padded with spaces

54
include/fat32/fat32_structures.inc
View File

@@ -63,20 +63,20 @@
; resulting in a value which does not fit in the Number of Sectors entry at 0x13.
struc FAT32_bpb_t
.reserved_init resb 3
.ident_8 resb 8
.bytes_per_sector_16 resb 2
.sectors_per_cluster_8 resb 1
.reserved_sectors_16 resb 2
.fat_count_8 resb 1
.dir_entry_count_16 resb 2
.sector_count_16 resb 2
.media_desc_8 resb 1
.sectors_per_fat_16 resb 2
.sectors_per_track_16 resb 2
.head_count_16 resb 2
.hidden_sectors_32 resb 4
.sector_count_32 resb 4
.reserved_jmpboot resb 3
.ident resb 8
.bytes_per_sector_word resb 2
.sectors_per_cluster_byte resb 1
.reserved_sectors_word resb 2
.fat_count_byte resb 1
.unused1_ZERO_word resb 2 ; Root entry count field, 0 on fat32
.unused2_ZERO_word resb 2 ; total sectors size 16, 0 on fat32
.media_desc_byte resb 1
.unused3_ZERO_word resb 2 ; FAT size 16, 0 on fat32
.sectors_per_track_word resb 2
.head_count_word resb 2
.hidden_sectors_dword resb 4
.total_sectors_dword resb 4
endstruc
; EBPB Information (FAT32)
@@ -96,19 +96,19 @@ endstruc
; 8 System identifier string. Always "FAT32 ". The spec says never to trust the contents of this string for any use.
struc FAT32_ebpb_t
.sectors_per_fat_32 resb 4
.fat32_flags_16 resb 2
.fat32_version_16 resb 2
.root_dir_cluster_32 resb 4
.fsinfo_sector_16 resb 2
.backup_boot_sector_16 resb 2
.reserved1 resb 12
.drive_number_8 resb 1
.nt_flags_8 resb 1
.signature_8 resb 1
.volume_serial_32 resb 4
.volume_label resb 11
.system_ident resb 8
.FATSz_dword resb 4
.extflags_word resb 2
.FSVersion_word resb 2
.root_clus_dword resb 4
.FSInfo_word resb 2
.BkBootSec_word resb 2
.reserved1 resb 12
.drive_number_byte resb 1
.nt_flags_byte resb 1
.signature_byte resb 1
.volume_id_dword resb 4
.volume_label_bytea resb 11
.system_ident_bytea resb 8
endstruc
; ## Standard 8.3 structure ###