| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for managing IDEPACK struct.
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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 | ; Idepack_FakeToSSBP
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| 9 | ; Parameters:
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| 10 | ; Nothing
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| 11 | ; Returns:
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| 12 | ; SS:BP: Ptr to IDEPACK
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| 13 | ; Corrupts registers:
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| 14 | ; AX
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| 15 | ;--------------------------------------------------------------------
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| 16 | Idepack_FakeToSSBP:
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| 17 | pop ax
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| 18 | sub sp, BYTE EXTRA_BYTES_FOR_INTPACK
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| 19 | mov bp, sp
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| 20 | jmp ax
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| 21 |
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Idepack_ConvertDapToIdepackAndIssueCommandFromAH
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| 25 | ; Parameters:
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| 26 | ; AH: IDE command to issue
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| 27 | ; BH: Timeout ticks
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| 28 | ; BL: IDE Status Register flag to wait after command
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| 29 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 30 | ; ES:SI: Ptr to DAP (EBIOS Disk Address Packet)
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| 31 | ; SS:BP: Ptr to IDEPACK
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| 32 | ; Returns:
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| 33 | ; AH: INT 13h Error Code
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| 34 | ; CF: Cleared if success, Set if error
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| 35 | ; Corrupts registers:
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| 36 | ; AL, BX, CX, DX, SI, ES
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| 37 | ;--------------------------------------------------------------------
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| 38 | ALIGN JUMP_ALIGN
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| 39 | Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
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| 40 | mov [bp+IDEPACK.bCommand], ah
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| 41 | mov al, [es:si+DAP.wSectorCount]
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| 42 | mov [bp+IDEPACK.bSectorCount], al
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| 43 |
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| 44 | mov al, [es:si+DAP.qwLBA] ; LBA byte 0
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| 45 | mov [bp+IDEPACK.bLbaLow], al
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| 46 | mov ax, [es:si+DAP.qwLBA+1] ; LBA bytes 1 and 2
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| 47 | mov [bp+IDEPACK.wLbaMiddleAndHigh], ax
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| 48 | mov ah, [es:si+DAP.qwLBA+3] ; LBA byte 3, LBA28 bits 24...27
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| 49 | mov [bp+IDEPACK.bLbaLowExt], ah
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| 50 | mov cx, [es:si+DAP.qwLBA+4] ; LBA bytes 4 and 5
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| 51 | mov [bp+IDEPACK.wLbaMiddleAndHighExt], cx
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| 52 |
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| 53 | and ah, 0Fh ; Limit bits for LBA28
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| 54 | call AccessDPT_GetDriveSelectByteToAL
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| 55 | or al, ah
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| 56 | mov [bp+IDEPACK.bDrvAndHead], al
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| 57 | les si, [es:si+DAP.dwMemoryAddress]
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| 58 | jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer
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| 59 |
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| 60 |
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| 61 | ;--------------------------------------------------------------------
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| 62 | ; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
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| 63 | ; Parameters:
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| 64 | ; AH: IDE command to issue
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| 65 | ; AL: Number of sectors to transfer (1...255, 0=256)
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| 66 | ; BH: Timeout ticks
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| 67 | ; BL: IDE Status Register flag to wait after command
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| 68 | ; CH: Cylinder number, bits 7...0
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| 69 | ; CL: Bits 7...6: Cylinder number bits 9 and 8
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| 70 | ; Bits 5...0: Starting sector number (1...63)
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| 71 | ; DH: Starting head number (0...255)
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| 72 | ; ES:SI: Ptr to data buffer
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| 73 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 74 | ; SS:BP: Ptr to IDEPACK
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| 75 | ; Returns:
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| 76 | ; AH: INT 13h Error Code
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| 77 | ; CF: Cleared if success, Set if error
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| 78 | ; Corrupts registers:
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| 79 | ; AL, BX, CX, DX
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| 80 | ;--------------------------------------------------------------------
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| 81 | ALIGN JUMP_ALIGN
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| 82 | Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH:
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| 83 | mov [bp+IDEPACK.bSectorCount], al
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| 84 | mov [bp+IDEPACK.bCommand], ah
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| 85 |
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| 86 | push bx
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| 87 | call Address_OldInt13hAddressToIdeAddress
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| 88 | call AccessDPT_GetDriveSelectByteToAL
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| 89 | or al, bh ; AL now has Drive and Head Select Byte
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| 90 | mov [bp+IDEPACK.bDrvAndHead], al
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| 91 | mov [bp+IDEPACK.bLbaLow], bl
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| 92 | mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
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| 93 | pop bx
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| 94 |
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| 95 | GetDeviceControlByteToIdepackAndStartTransfer:
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| 96 | call AccessDPT_GetDeviceControlByteToAL
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| 97 | mov [bp+IDEPACK.bDeviceControl], al
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| 98 | jmp Device_OutputCommandWithParameters
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| 99 |
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| 100 |
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| 101 | ;--------------------------------------------------------------------
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| 102 | ; Idepack_StoreNonExtParametersAndIssueCommandFromAL
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| 103 | ; Parameters:
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| 104 | ; BH: Timeout ticks
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| 105 | ; BL: IDE Status Register flag to wait after command
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| 106 | ; AL: IDE command to issue
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| 107 | ; AH: Parameter to Drive and Head Select Register (Head bits only)
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| 108 | ; DL: Parameter to Sector Count Register
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| 109 | ; DH: Parameter to LBA Low / Sector Number Register
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| 110 | ; CL: Parameter to LBA Middle / Cylinder Low Register
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| 111 | ; CH: Parameter to LBA High / Cylinder High Register
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| 112 | ; SI: Parameter to Features Register
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| 113 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 114 | ; SS:BP: Ptr to IDEPACK
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| 115 | ; Returns:
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| 116 | ; AH: INT 13h Error Code
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| 117 | ; CF: Cleared if success, Set if error
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| 118 | ; Corrupts registers:
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| 119 | ; AL, BX, CX, DX
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| 120 | ;--------------------------------------------------------------------
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| 121 | ALIGN JUMP_ALIGN
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| 122 | Idepack_StoreNonExtParametersAndIssueCommandFromAL:
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| 123 | mov [bp+IDEPACK.bFeatures], si
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| 124 | mov [bp+IDEPACK.bCommand], al
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| 125 | mov [bp+IDEPACK.wSectorCountAndLbaLow], dx
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| 126 | mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
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| 127 |
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| 128 | ; Drive and Head select byte
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| 129 | and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only
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| 130 | call AccessDPT_GetDriveSelectByteToAL
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| 131 | or al, ah
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| 132 | mov [bp+IDEPACK.bDrvAndHead], al
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| 133 |
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| 134 | ; Device Control byte with interrupts disabled
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| 135 | call AccessDPT_GetDeviceControlByteToAL
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| 136 | or al, FLG_DEVCONTROL_nIEN ; Disable interrupt
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| 137 | mov [bp+IDEPACK.bDeviceControl], al
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| 138 |
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| 139 | jmp Device_OutputCommandWithParameters
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