| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for loading correct transfer command.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; CommandLookup_GetEbiosIndexToBX
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| 9 | ; CommandLookup_OrOldInt13hIndexToBL
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| 10 | ; Parameters:
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| 11 | ; DS:DI: Ptr to DPT
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| 12 | ; ES:SI: Ptr to DAP (Disk Address Packet)
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| 13 | ; Returns:
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| 14 | ; BX: Index to command lookup table
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| 15 | ; Corrupts registers:
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| 16 | ; AX
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| 17 | ;--------------------------------------------------------------------
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| 18 | ALIGN JUMP_ALIGN
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| 19 | CommandLookup_GetEbiosIndexToBX:
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| 20 | ; LBA28 or LBA48 command
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| 21 | xor bx, bx
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| 22 | mov ax, [es:si+DAP.qwLBA+3] ; Load LBA48 bytes 3 and 4
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| 23 | and al, ~0Fh ; Clear LBA28 bits 24...27
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| 24 | or al, [es:si+DAP.qwLBA+5]
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| 25 | cmp bx, ax ; Set CF if any of bits 28...47 set
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| 26 | rcl bx, 1 ; BX = 0 for LBA28, BX = 1 for LBA48
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| 27 |
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| 28 | ; Block mode or single sector
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| 29 | ALIGN JUMP_ALIGN
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| 30 | CommandLookup_OrOldInt13hIndexToBL:
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| 31 | mov al, FLGH_DPT_BLOCK_MODE_SUPPORTED ; Bit 1
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| 32 | and al, [di+DPT.bFlagsHigh]
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| 33 | or bl, al ; BX = index to lookup table
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| 34 | ret
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| 35 |
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| 36 |
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| 37 | g_rgbReadCommandLookup:
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| 38 | db COMMAND_READ_SECTORS ; 00b, CHS or LBA28 single sector
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| 39 | db COMMAND_READ_SECTORS_EXT ; 01b, LBA48 single sector
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| 40 | db COMMAND_READ_MULTIPLE ; 10b, CHS or LBA28 block mode
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| 41 | db COMMAND_READ_MULTIPLE_EXT ; 11b, LBA48 block mode
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| 42 |
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| 43 | g_rgbWriteCommandLookup:
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| 44 | db COMMAND_WRITE_SECTORS
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| 45 | db COMMAND_WRITE_SECTORS_EXT
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| 46 | db COMMAND_WRITE_MULTIPLE
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| 47 | db COMMAND_WRITE_MULTIPLE_EXT
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| 48 |
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| 49 | g_rgbVerifyCommandLookup:
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| 50 | db COMMAND_VERIFY_SECTORS
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| 51 | db COMMAND_VERIFY_SECTORS_EXT
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| 52 | db COMMAND_VERIFY_SECTORS
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| 53 | db COMMAND_VERIFY_SECTORS_EXT
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| 54 |
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