| 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 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Idepack_FakeToSSBP
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| 25 | ; Parameters:
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| 26 | ; Nothing
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| 27 | ; Returns:
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| 28 | ; SS:BP: Ptr to IDEPACK
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| 29 | ; Corrupts registers:
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| 30 | ; AX
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| 31 | ;--------------------------------------------------------------------
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| 32 | Idepack_FakeToSSBP:
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| 33 | pop ax
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| 34 | sub sp, BYTE SIZE_OF_IDEPACK_WITHOUT_INTPACK
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| 35 | mov bp, sp
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| 36 | jmp ax
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| 37 |
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| 38 |
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| 39 | ;--------------------------------------------------------------------
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| 40 | ; Idepack_ConvertDapToIdepackAndIssueCommandFromAH
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| 41 | ; Parameters:
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| 42 | ; AH: IDE command to issue
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| 43 | ; BH: Timeout ticks
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| 44 | ; BL: IDE Status Register flag to wait after command
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| 45 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 46 | ; ES:SI: Ptr to DAP (EBIOS Disk Address Packet)
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| 47 | ; SS:BP: Ptr to IDEPACK
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| 48 | ; Returns:
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| 49 | ; AH: INT 13h Error Code
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| 50 | ; CX: Number of successfully transferred sectors (for transfer commands)
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| 51 | ; CF: Cleared if success, Set if error
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| 52 | ; Corrupts registers:
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| 53 | ; AL, BX, (CX), DX, SI, ES
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| 54 | ;--------------------------------------------------------------------
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| 55 | %ifdef MODULE_EBIOS
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| 56 | ALIGN JUMP_ALIGN
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| 57 | Idepack_ConvertDapToIdepackAndIssueCommandFromAH:
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| 58 | mov al, [es:si+DAP.wSectorCount]
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| 59 | mov [bp+IDEPACK.bSectorCount], al
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| 60 | mov [bp+IDEPACK.bCommand], ah
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| 61 |
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| 62 | mov al, [es:si+DAP.qwLBA] ; LBA byte 0
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| 63 | mov [bp+IDEPACK.bLbaLow], al
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| 64 | mov ax, [es:si+DAP.qwLBA+1] ; LBA bytes 1 and 2
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| 65 | mov [bp+IDEPACK.wLbaMiddleAndHigh], ax
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| 66 | mov ah, [es:si+DAP.qwLBA+3] ; LBA byte 3, LBA28 bits 24...27
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| 67 | mov [bp+IDEPACK.bLbaLowExt], ah
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| 68 | mov cx, [es:si+DAP.qwLBA+4] ; LBA bytes 4 and 5
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| 69 | mov [bp+IDEPACK.wLbaMiddleAndHighExt], cx
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| 70 |
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| 71 | and ah, 0Fh ; Limit bits for LBA28
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| 72 | call AccessDPT_GetDriveSelectByteForEbiosToAL
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| 73 | or al, ah
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| 74 | mov [bp+IDEPACK.bDrvAndHead], al
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| 75 |
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| 76 | ; Normalize data buffer pointer to ES:SI
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| 77 | mov ax, [es:si+DAP.wOffset]
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| 78 | mov cx, ax
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| 79 | eSHR_IM ax, 4 ; Divide offset by 16
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| 80 | add ax, [es:si+DAP.wSegment] ; Add segment
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| 81 | mov es, ax ; Segment normalized
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| 82 | mov si, cx
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| 83 | and si, BYTE 0Fh ; Offset normalized
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| 84 | jmp SHORT GetDeviceControlByteToIdepackAndStartTransfer
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| 85 | %endif ; MODULE_EBIOS
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| 86 |
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| 87 |
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| 88 | ;--------------------------------------------------------------------
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| 89 | ; Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
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| 90 | ; Parameters:
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| 91 | ; AH: IDE command to issue
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| 92 | ; AL: Number of sectors to transfer (for xfer commands)
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| 93 | ; BH: Timeout ticks
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| 94 | ; BL: IDE Status Register flag to wait after command
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| 95 | ; CH: Cylinder number, bits 7...0
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| 96 | ; CL: Bits 7...6: Cylinder number bits 9 and 8
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| 97 | ; Bits 5...0: Starting sector number (1...63)
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| 98 | ; DH: Starting head number (0...255)
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| 99 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 100 | ; ES:SI: Ptr to normalized data buffer (for xfer commands)
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| 101 | ; SS:BP: Ptr to IDEPACK (containing INTPACK)
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| 102 | ; Returns:
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| 103 | ; AH: INT 13h Error Code
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| 104 | ; CX: Number of successfully transferred sectors (for transfer commands)
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| 105 | ; CF: Cleared if success, Set if error
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| 106 | ; Corrupts registers:
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| 107 | ; AL, BX, (CX), DX
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| 108 | ;--------------------------------------------------------------------
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| 109 | ALIGN JUMP_ALIGN
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| 110 | Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH:
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| 111 | mov [bp+IDEPACK.bSectorCount], al
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| 112 | mov [bp+IDEPACK.bCommand], ah
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| 113 |
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| 114 | push bx
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| 115 | call Address_OldInt13hAddressToIdeAddress
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| 116 | call AccessDPT_GetDriveSelectByteForOldInt13hToAL
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| 117 | or al, bh ; AL now has Drive and Head Select Byte
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| 118 | mov [bp+IDEPACK.bDrvAndHead], al
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| 119 | mov [bp+IDEPACK.bLbaLow], bl
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| 120 | mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
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| 121 | pop bx
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| 122 |
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| 123 | GetDeviceControlByteToIdepackAndStartTransfer:
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| 124 | call AccessDPT_GetDeviceControlByteToAL
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| 125 | mov [bp+IDEPACK.bDeviceControl], al
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| 126 | jmp Device_OutputCommandWithParameters
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| 127 |
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| 128 |
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| 129 | ;--------------------------------------------------------------------
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| 130 | ; Idepack_StoreNonExtParametersAndIssueCommandFromAL
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| 131 | ; Parameters:
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| 132 | ; BH: Timeout ticks
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| 133 | ; BL: IDE Status Register flag to wait after command
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| 134 | ; AL: IDE command to issue
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| 135 | ; AH: Parameter to Drive and Head Select Register (Head bits only)
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| 136 | ; DL: Parameter to Sector Count Register
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| 137 | ; DH: Parameter to LBA Low / Sector Number Register
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| 138 | ; CL: Parameter to LBA Middle / Cylinder Low Register
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| 139 | ; CH: Parameter to LBA High / Cylinder High Register
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| 140 | ; SI: Parameter to Features Register
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| 141 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 142 | ; SS:BP: Ptr to IDEPACK
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| 143 | ; Returns:
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| 144 | ; AH: INT 13h Error Code
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| 145 | ; CF: Cleared if success, Set if error
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| 146 | ; Corrupts registers:
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| 147 | ; AL, BX, CX, DX
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| 148 | ;--------------------------------------------------------------------
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| 149 | ALIGN JUMP_ALIGN
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| 150 | Idepack_StoreNonExtParametersAndIssueCommandFromAL:
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| 151 | mov [bp+IDEPACK.bFeatures], si
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| 152 | mov [bp+IDEPACK.bCommand], al
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| 153 | mov [bp+IDEPACK.wSectorCountAndLbaLow], dx
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| 154 | mov [bp+IDEPACK.wLbaMiddleAndHigh], cx
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| 155 |
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| 156 | ; Drive and Head select byte
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| 157 | and ah, MASK_DRVNHEAD_HEAD ; Keep head bits only
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| 158 | call AccessDPT_GetDriveSelectByteForOldInt13hToAL
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| 159 | or al, ah
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| 160 | mov [bp+IDEPACK.bDrvAndHead], al
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| 161 |
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| 162 | ; Device Control byte with interrupts disabled
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| 163 | mov BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
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| 164 |
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| 165 | jmp Device_OutputCommandWithParameters
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