a few fixes to complete the move
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@@ -16,7 +16,6 @@
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%ifndef __INC_FAT32_SYS
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%include "partition_table.inc"
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%include "fat32/bpb_offset_bx.inc"
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%include "fat32/fat32_structures.inc"
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; int read_mbr(int boot_drive, void* dst)
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@@ -38,7 +37,7 @@ FAT32_load_mbr:
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.check_sig:
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mov bx, [bp + 6]
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cmp word [bx + 0x1FE], 0xAA55 ; check for bytes at end
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jne ReadMbrData.error_nosign
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jne .error_nosign
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; TODO: this needs more error checking, zero checking, check the sig a bunch of stuff...
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.endp:
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__CDECL16_PROC_EXIT
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@@ -61,21 +60,21 @@ FAT32_load_vbr:
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.find_active_L0:
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mov al, [bx + PartEntry_t.attributes]
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cmp al, 0x80 ; 0x80 == 1000_0000b
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je ReadVbrData.check_fstype
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je .check_fstype
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add bx, PartEntry_t_size ; next part entry's attributes
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loop ReadVbrData.find_active_L0
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jmp ReadVbrData.error_noactive
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loop .find_active_L0
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jmp .error_noactive
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.check_fstype:
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; check for part_type = 0x0C (DOS 7.1+/W95 FAT32 w/ LBA) or 0x1C (Hidden 0x0C)
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__BOCHS_MAGIC_DEBUG
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mov al, [bx + PartEntry_t.part_type]
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cmp al, 0x0C
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je ReadVbrData.active_ok
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je .active_ok
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; *or*
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cmp al, 0x1C
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je ReadVbrData.active_ok
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je .active_ok
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jmp ReadVbrData.error_badparttype ; error if part_type != 0x1C or 0x0C
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jmp .error_badparttype ; error if part_type != 0x1C or 0x0C
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.active_ok:
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movzx ax, byte [bp + 4]
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push ax ; drive_num (2)
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@@ -92,19 +91,19 @@ FAT32_load_vbr:
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.check_sig:
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mov bx, [bp + 6]
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cmp word [bx + 0x1FE], 0xAA55 ; check for bytes at end
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jne ReadVbrData.error_nosign
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jne .error_nosign
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.check_FAT_sanity:
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; we only quickly validate that this is *probably* a FAT32 volume
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add bx, 11 ; point bx at start of bpb (skip jmp code and ident)
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cmp word [bx + FAT32_bpb_t.u16_TotalSectors16], 0 ; TotalSectors16 should be 0 (use TotalSectors32 in bpb)
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jne ReadVbrData.error_totsectors
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jne .error_totsectors
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cmp word [bx + FAT32_bpb_t.u16_FATSize16], 0 ; FatSize16 will be 0 if FAT32 (use FATSize32 in ebpb)
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jne ReadVbrData.error_fatsz
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jne .error_fatsz
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cmp word [bx + FAT32_bpb_t.u16_RootEntryCount16], 0 ; root dir info is in data clusters on fat32
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jne ReadVbrData.error_rootdir
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jne .error_rootdir
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.endp:
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__CDECL16_PROC_EXIT
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ret
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