| [400] | 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Memory mapped IDE Device transfer functions.
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| 3 |
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| 4 | ;
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| [412] | 5 | ; XTIDE Universal BIOS and Associated Tools
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| [400] | 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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| [412] | 12 | ;
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| [400] | 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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| [412] | 16 | ; GNU General Public License for more details.
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| [400] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| [412] | 18 | ;
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| [400] | 19 |
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| 20 | ; Structure containing variables for PIO transfer functions.
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| 21 | ; This struct must not be larger than IDEPACK without INTPACK.
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| [414] | 22 | struc MEMPIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc.
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| 23 | .wSectorsInBlock resb 2 ; 0-1, Block size in sectors
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| 24 | .fpDPT resb 4 ; 2-5, Far pointer to DPT
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| 25 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer
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| [400] | 26 | resb 1 ; 7, IDEPACK.bDeviceControl
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| [414] | 27 | .bSectorsDone resb 1 ; 8, Number of sectors xferred
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| [400] | 28 | endstruc
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| 29 |
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| [473] | 30 | SECTOR_ACCESS_WINDOW_SIZE EQU 512 ; 512 bytes
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| [400] | 31 |
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| [473] | 32 |
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| [400] | 33 | ; Section containing code
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| 34 | SECTION .text
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| 35 |
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| 36 | ;--------------------------------------------------------------------
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| 37 | ; JrIdeTransfer_StartWithCommandInAL
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| 38 | ; Parameters:
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| 39 | ; AL: IDE command that was used to start the transfer
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| 40 | ; (all PIO read and write commands including Identify Device)
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| [474] | 41 | ; ES:SI: Ptr to normalized data buffer
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| [400] | 42 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 43 | ; SS:BP: Ptr to IDEPACK
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| 44 | ; Returns:
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| 45 | ; AH: INT 13h Error Code
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| 46 | ; CX: Number of successfully transferred sectors
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| 47 | ; CF: Cleared if success, Set if error
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| 48 | ; Corrupts registers:
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| 49 | ; AL, BX, DX, SI, ES
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| 50 | ;--------------------------------------------------------------------
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| 51 | ALIGN JUMP_ALIGN
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| 52 | JrIdeTransfer_StartWithCommandInAL:
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| [473] | 53 | ; Initialize MEMPIOVARS
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| 54 | xchg cx, ax ; IDE command to CL
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| 55 | xor ax, ax
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| 56 | mov [bp+MEMPIOVARS.bSectorsDone], al
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| 57 | mov al, [bp+IDEPACK.bSectorCount]
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| 58 | mov [bp+MEMPIOVARS.bSectorsLeft], al
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| 59 | mov al, [di+DPT_ATA.bBlockSize]
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| 60 | mov [bp+MEMPIOVARS.wSectorsInBlock], ax
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| [400] | 61 | mov [bp+MEMPIOVARS.fpDPT], di
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| 62 | mov [bp+MEMPIOVARS.fpDPT+2], ds
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| 63 |
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| [473] | 64 | ; Get far pointer to Sector Access Window
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| 65 | mov dx, [di+DPT.wBasePort]
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| 66 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
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| 67 | jne SHORT .GetSectorAccessWindowForXTCF
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| 68 |
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| 69 | ; Get Sector Access Window for JR-IDE/ISA
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| 70 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
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| 71 | mov ds, dx ; Segment for JR-IDE/ISA
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| 72 | jmp SHORT .SectorAccessWindowLoadedToDSDI
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| 73 |
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| 74 | .GetSectorAccessWindowForXTCF:
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| 75 | xor di, di
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| 76 | add dl, XTCF_CONTROL_REGISTER
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| 77 | in al, dx ; Read high byte for Sector Access Window segment
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| 78 | xchg ah, al
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| 79 | mov ds, ax
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| 80 |
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| [400] | 81 | ; Are we reading or writing?
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| [473] | 82 | .SectorAccessWindowLoadedToDSDI:
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| 83 | test cl, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
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| [400] | 84 | jnz SHORT WriteToSectorAccessWindow
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| [473] | 85 | cmp cl, COMMAND_WRITE_MULTIPLE
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| [400] | 86 | je SHORT WriteToSectorAccessWindow
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| 87 | ; Fall to ReadFromSectorAccessWindow
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| 88 |
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| 89 | ;--------------------------------------------------------------------
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| 90 | ; ReadFromSectorAccessWindow
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| 91 | ; Parameters:
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| [473] | 92 | ; DS:DI: Ptr to Sector Access Window
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| [400] | 93 | ; ES:SI: Normalized ptr to buffer to receive data
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| 94 | ; SS:BP: Ptr to MEMPIOVARS
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| 95 | ; Returns:
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| 96 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 97 | ; AH: BIOS Error code
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| 98 | ; CX: Number of successfully transferred sectors
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| 99 | ; CF: 0 if transfer successful
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| 100 | ; 1 if any error
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| 101 | ; Corrupts registers:
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| [475] | 102 | ; AL, BX, DX, SI
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| [400] | 103 | ;--------------------------------------------------------------------
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| 104 | ReadFromSectorAccessWindow:
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| [473] | 105 | xchg si, di ; DS:SI = source, ES:DI = Destination
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| [400] | 106 | call WaitUntilReadyToTransferNextBlock
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| 107 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 108 |
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| [475] | 109 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] ; Clears CH
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| [412] | 110 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 111 | jbe SHORT .ReadLastBlockFromDrive
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| [400] | 112 |
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| 113 | ALIGN JUMP_ALIGN
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| 114 | .ReadNextBlockFromDrive:
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| 115 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 116 | call WaitUntilReadyToTransferNextBlock
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| 117 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 118 |
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| [476] | 119 | ; Update number of successfully read sectors and sectors left to transfer.
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| 120 | ; We cannot use SUB instruction as a comparison since it will not
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| 121 | ; work in this situation:
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| 122 | ; Before SUB we have 2 full blocks left to transfer. SUB command
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| 123 | ; then compares 2 full blocks against one full block and updates
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| 124 | ; sectors left to one full block and jumps to .ReadNextBlockFromDrive,
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| 125 | ; since we have one full block left to transfer. After it has been
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| 126 | ; transferred, there will be a wait for next block but DRQ is never
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| 127 | ; set since all is transferred! Then we get timeout error.
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| [400] | 128 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| [476] | 129 | sub [bp+MEMPIOVARS.bSectorsLeft], cl
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| [412] | 130 | add [bp+MEMPIOVARS.bSectorsDone], cl
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| [476] | 131 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| [412] | 132 | ja SHORT .ReadNextBlockFromDrive
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| [400] | 133 |
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| 134 | ALIGN JUMP_ALIGN
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| 135 | .ReadLastBlockFromDrive:
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| 136 | mov cl, [bp+MEMPIOVARS.bSectorsLeft]
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| [419] | 137 | push cx
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| [400] | 138 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 139 |
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| 140 | ; Check for errors in last block
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| 141 | CheckErrorsAfterTransferringLastMemoryMappedBlock:
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| 142 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| [417] | 143 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY)
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| [400] | 144 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| [419] | 145 | pop cx ; [bp+MEMPIOVARS.bSectorsLeft]
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| 146 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| [400] | 147 |
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| [445] | 148 | ; All sectors successfully transferred
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| [475] | 149 | add cl, [bp+MEMPIOVARS.bSectorsDone] ; Never sets CF
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| [419] | 150 | ret
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| 151 |
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| [400] | 152 | ; Return number of successfully transferred sectors
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| 153 | ReturnWithMemoryIOtransferErrorInAH:
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| 154 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 155 | %ifdef USE_386
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| [475] | 156 | movzx cx, BYTE [bp+MEMPIOVARS.bSectorsDone]
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| [400] | 157 | %else
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| [475] | 158 | mov ch, 0 ; Preserve CF
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| [400] | 159 | mov cl, [bp+MEMPIOVARS.bSectorsDone]
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| 160 | %endif
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| 161 | ret
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| 162 |
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| 163 |
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| 164 | ;--------------------------------------------------------------------
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| 165 | ; WriteToSectorAccessWindow
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| 166 | ; Parameters:
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| [473] | 167 | ; DS:DI: Ptr to Sector Access Window
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| [400] | 168 | ; ES:SI: Normalized ptr to buffer containing data
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| 169 | ; SS:BP: Ptr to MEMPIOVARS
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| 170 | ; Returns:
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| 171 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 172 | ; AH: BIOS Error code
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| 173 | ; CX: Number of successfully transferred sectors
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| 174 | ; CF: 0 if transfer successful
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| 175 | ; 1 if any error
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| 176 | ; Corrupts registers:
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| 177 | ; AL, BX, DX, SI, ES
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| 178 | ;--------------------------------------------------------------------
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| 179 | ALIGN JUMP_ALIGN
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| 180 | WriteToSectorAccessWindow:
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| 181 | push es
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| [473] | 182 | push ds
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| 183 | pop es ; ES:DI = Sector Access Window (destination)
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| 184 | pop ds ; DS:SI = Ptr to source buffer
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| [400] | 185 |
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| 186 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 187 | call WaitUntilReadyToTransferNextBlock
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| 188 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 189 |
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| 190 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| [412] | 191 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 192 | jbe SHORT .WriteLastBlockToDrive
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| [400] | 193 |
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| 194 | ALIGN JUMP_ALIGN
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| 195 | .WriteNextBlockToDrive:
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| 196 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 197 | call WaitUntilReadyToTransferNextBlock
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| 198 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 199 |
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| 200 | ; Increment number of successfully written WORDs
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| 201 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| [476] | 202 | sub [bp+MEMPIOVARS.bSectorsLeft], cl
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| [412] | 203 | add [bp+MEMPIOVARS.bSectorsDone], cl
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| [476] | 204 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| [412] | 205 | ja SHORT .WriteNextBlockToDrive
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| [400] | 206 |
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| 207 | ALIGN JUMP_ALIGN
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| 208 | .WriteLastBlockToDrive:
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| 209 | mov cl, [bp+MEMPIOVARS.bSectorsLeft]
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| [419] | 210 | push cx
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| [400] | 211 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock
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| 212 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 213 |
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| 214 | ;--------------------------------------------------------------------
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| 215 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 216 | ; Parameters:
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| 217 | ; CX: Number of sectors in block
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| 218 | ; DS:SI: Normalized ptr to source buffer
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| 219 | ; ES:DI: Ptr to Sector Access Window
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| 220 | ; Returns:
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| 221 | ; CX, DX: Zero
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| 222 | ; SI: Updated
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| 223 | ; Corrupts registers:
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| 224 | ; BX
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| 225 | ;--------------------------------------------------------------------
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| 226 | ALIGN JUMP_ALIGN
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| 227 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI:
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| 228 | mov bx, di
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| 229 | mov dx, cx
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| 230 | xor cl, cl
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| 231 | ALIGN JUMP_ALIGN
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| [475] | 232 | .WriteNextSector:
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| [473] | 233 | mov ch, SECTOR_ACCESS_WINDOW_SIZE >> 9
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| [400] | 234 | rep movsw
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| 235 | mov di, bx ; Reset for next sector
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| 236 | dec dx
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| [475] | 237 | jnz SHORT .WriteNextSector
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| [400] | 238 | ret
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| 239 |
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| 240 |
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| 241 | ;--------------------------------------------------------------------
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| 242 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 243 | ; Parameters:
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| [475] | 244 | ; CX Number of sectors in full block or sectors in last partial block
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| [400] | 245 | ; ES:DI: Normalized ptr to buffer to receive data (destination)
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| 246 | ; DS:SI: Ptr to Sector Access Window (source)
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| 247 | ; Returns:
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| 248 | ; CX, DX: Zero
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| 249 | ; DI: Updated
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| 250 | ; Corrupts registers:
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| 251 | ; BX
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| 252 | ;--------------------------------------------------------------------
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| 253 | ALIGN JUMP_ALIGN
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| 254 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI:
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| 255 | mov bx, si
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| 256 | mov dx, cx
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| 257 | xor cl, cl
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| 258 | ALIGN JUMP_ALIGN
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| [475] | 259 | .ReadNextSector:
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| [473] | 260 | mov ch, SECTOR_ACCESS_WINDOW_SIZE >> 9
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| [400] | 261 | rep movsw
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| 262 | mov si, bx ; Reset for next sector
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| 263 | dec dx
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| [475] | 264 | jnz SHORT .ReadNextSector
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| [400] | 265 | ret
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| 266 |
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| 267 |
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| 268 | ;--------------------------------------------------------------------
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| 269 | ; WaitUntilReadyToTransferNextBlock
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| 270 | ; Parameters:
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| 271 | ; SS:BP: Ptr to MEMPIOVARS
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| 272 | ; Returns:
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| 273 | ; AH: INT 13h Error Code
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| 274 | ; CF: Cleared if success, Set if error
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| 275 | ; Corrupts registers:
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| 276 | ; AL, BX, CX, DX
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| 277 | ;--------------------------------------------------------------------
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| 278 | ALIGN JUMP_ALIGN
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| 279 | WaitUntilReadyToTransferNextBlock:
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| 280 | push ds
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| 281 | push di
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| 282 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 283 | call IdeWait_IRQorDRQ ; Always polls
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| 284 | pop di
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| 285 | pop ds
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| 286 | ret
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| 287 |
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| 288 |
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| [473] | 289 | %if SECTOR_ACCESS_WINDOW_SIZE <> 512
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| 290 | %error "SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. JrIdeTransfer.asm needs changes."
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| [400] | 291 | %endif
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