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move fsinfo just for my easy reading

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This commit is contained in:
Elaina Claus
2024-10-17 10:33:52 -04:00
parent e12ea89fda
commit b5cc1c9ec1
1 changed files with 46 additions and 49 deletions
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95
include/fat32/fat32_structures.inc
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@@ -134,19 +134,43 @@ 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 ##
@@ -166,50 +190,23 @@ endstruc
; Max of 20 in sequence == 0x14 ; Max of 20 in sequence == 0x14
struc FAT32_LFN_t struc FAT32_LFN_t
.order resb 1 .order resb 1
.lfn_first5 resb 10 .lfn_first5 resb 10
.attributes_8 resb 1 .attributes_8 resb 1
.zero1 resb 1 .zero1 resb 1
.checksum resb 1 .checksum resb 1
.lfn_next6 resb 12 .lfn_next6 resb 12
.zero2 resb 2 .zero2 resb 2
.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
.active_drive_lba_32 resd 1 .active_drive_lba_32 resd 1
endstruc endstruc