| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for accessing ATA information read with
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| 3 | ; IDENTIFY DEVICE command.
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| 4 |
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| 5 | ; Section containing code
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| 6 | SECTION .text
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| 7 |
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| 8 | ;--------------------------------------------------------------------
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| 9 | ; AtaID_GetPCHStoAXBLBHfromAtaInfoInESSI
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| 10 | ; Parameters:
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| 11 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 12 | ; Returns:
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| 13 | ; AX: Number of user specified P-CHS cylinders
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| 14 | ; BH: Number of user specified P-CHS sectors per track
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| 15 | ; BL: Number of user specified P-CHS heads
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| 16 | ; Corrupts registers:
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| 17 | ; Nothing
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| 18 | ;--------------------------------------------------------------------
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| 19 | AtaID_GetPCHStoAXBLBHfromAtaInfoInESSI:
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| 20 | mov ax, [es:si+ATA1.wCylCnt] ; Cylinders (1...16383)
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| 21 | mov bl, [es:si+ATA1.wHeadCnt] ; Heads (1...16)
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| 22 | mov bh, [es:si+ATA1.wSPT] ; Sectors per Track (1...63)
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| 23 | ret
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| 24 |
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| 25 |
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| 26 | ;--------------------------------------------------------------------
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| 27 | ; AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
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| 28 | ; Parameters:
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| 29 | ; ES:SI: Ptr to 512-byte ATA information read from the drive
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| 30 | ; Returns:
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| 31 | ; BX:DX:AX: 48-bit sector count
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| 32 | ; Corrupts registers:
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| 33 | ; Nothing
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| 34 | ;--------------------------------------------------------------------
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| 35 | AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI:
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| 36 | mov bx, Registers_ExchangeDSSIwithESDI
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| 37 | call bx ; ATA info now in DS:DI
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| 38 | push bx ; We will return via Registers_ExchangeDSSIwithESDI
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| 39 | xor bx, bx
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| 40 | test BYTE [di+ATA1.wCaps+1], A1_wCaps_LBA>>8
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| 41 | jz SHORT .GetChsSectorCount
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| 42 | ; Fall to .GetLbaSectorCount
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| 43 |
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| 44 | ;--------------------------------------------------------------------
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| 45 | ; .GetLbaSectorCount
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| 46 | ; .GetLba28SectorCount
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| 47 | ; .GetChsSectorCount
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| 48 | ; Parameters:
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| 49 | ; BX: Zero
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| 50 | ; DS:DI: Ptr to 512-byte ATA information read from the drive
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| 51 | ; Returns:
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| 52 | ; BX:DX:AX: 48-bit sector count
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| 53 | ; Corrupts registers:
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| 54 | ; Nothing
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| 55 | ;--------------------------------------------------------------------
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| 56 | .GetLbaSectorCount:
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| 57 | test BYTE [di+ATA6.wSetSup83+1], A6_wSetSup83_LBA48>>8
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| 58 | jz SHORT .GetLba28SectorCount
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| 59 | mov ax, [di+ATA6.qwLBACnt]
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| 60 | mov dx, [di+ATA6.qwLBACnt+2]
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| 61 | mov bx, [di+ATA6.qwLBACnt+4]
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| 62 | ret
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| 63 |
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| 64 | .GetLba28SectorCount:
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| 65 | mov ax, [di+ATA1.dwLBACnt]
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| 66 | mov dx, [di+ATA1.dwLBACnt+2]
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| 67 | ret
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| 68 |
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| 69 | .GetChsSectorCount:
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| 70 | mov al, [di+ATA1.wSPT] ; AL=Sectors per track
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| 71 | mul BYTE [di+ATA1.wHeadCnt] ; AX=Sectors per track * number of heads
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| 72 | mul WORD [di+ATA1.wCylCnt] ; DX:AX=Sectors per track * number of heads * number of cylinders
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| 73 | ret
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