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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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2
include/error_codes.inc
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@@ -63,7 +63,7 @@
%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'

16
include/fat32/FAT32_SYS.inc
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@@ -76,6 +76,22 @@ InitFATDriver:
.error: .error:
ERROR STAGE2_FAT32_INIT_CF 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 ; 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

54
include/fat32/fat32_structures.inc
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@@ -63,20 +63,20 @@
; 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 +96,19 @@ 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 ###