[238] | 1 | ; Project name : XTIDE Universal BIOS
|
---|
| 2 | ; Description : Memory mapped IDE Device transfer functions.
|
---|
| 3 |
|
---|
| 4 | ; Structure containing variables for PIO transfer functions.
|
---|
| 5 | ; This struct must not be larger than IDEPACK without INTPACK.
|
---|
| 6 | struc MEMPIOVARS
|
---|
| 7 | .wWordsInBlock resb 2 ; 0, Block size in WORDs
|
---|
| 8 | .wWordsLeft resb 2 ; 2, WORDs left to transfer
|
---|
| 9 | .wWordsDone resb 2 ; 4, Number of sectors xferred
|
---|
[242] | 10 | ; TODO: The above word vars could just as well be byte vars?
|
---|
| 11 | resb 1 ; 6,
|
---|
[238] | 12 | resb 1 ; 7, IDEPACK.bDeviceControl
|
---|
| 13 | .fpDPT resb 4 ; 8, Far pointer to DPT
|
---|
| 14 | endstruc
|
---|
| 15 |
|
---|
| 16 |
|
---|
| 17 | ; Section containing code
|
---|
| 18 | SECTION .text
|
---|
| 19 |
|
---|
| 20 | ;--------------------------------------------------------------------
|
---|
| 21 | ; MemIdeTransfer_StartWithCommandInAL
|
---|
| 22 | ; Parameters:
|
---|
| 23 | ; AL: IDE command that was used to start the transfer
|
---|
| 24 | ; (all PIO read and write commands including Identify Device)
|
---|
| 25 | ; ES:SI: Ptr to normalized data buffer
|
---|
| 26 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
| 27 | ; SS:BP: Ptr to IDEPACK
|
---|
| 28 | ; Returns:
|
---|
| 29 | ; AH: INT 13h Error Code
|
---|
| 30 | ; CX: Number of successfully transferred sectors
|
---|
| 31 | ; CF: Cleared if success, Set if error
|
---|
| 32 | ; Corrupts registers:
|
---|
| 33 | ; AL, BX, DX, SI, ES
|
---|
| 34 | ;--------------------------------------------------------------------
|
---|
| 35 | ALIGN JUMP_ALIGN
|
---|
| 36 | MemIdeTransfer_StartWithCommandInAL:
|
---|
[242] | 37 | push cs ; We push CS here (segment of SAW) and later pop it to DS (reads) or ES (writes)
|
---|
| 38 |
|
---|
[238] | 39 | ; Initialize MEMPIOVARS
|
---|
[242] | 40 | xor cx, cx
|
---|
| 41 | mov [bp+MEMPIOVARS.wWordsDone], cx
|
---|
| 42 | mov ch, [bp+IDEPACK.bSectorCount]
|
---|
| 43 | mov [bp+MEMPIOVARS.wWordsLeft], cx
|
---|
| 44 | mov ch, [di+DPT_ATA.bSetBlock]
|
---|
| 45 | mov [bp+MEMPIOVARS.wWordsInBlock], cx
|
---|
[238] | 46 | mov [bp+MEMPIOVARS.fpDPT], di
|
---|
| 47 | mov [bp+MEMPIOVARS.fpDPT+2], ds
|
---|
| 48 |
|
---|
| 49 | ; Are we reading or writing?
|
---|
[242] | 50 | test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
|
---|
| 51 | jnz SHORT WriteToSectorAccessWindow
|
---|
| 52 | cmp al, COMMAND_WRITE_MULTIPLE
|
---|
| 53 | je SHORT WriteToSectorAccessWindow
|
---|
| 54 | ; Fall to ReadFromSectorAccessWindow
|
---|
[238] | 55 |
|
---|
[242] | 56 | ;--------------------------------------------------------------------
|
---|
| 57 | ; ReadFromSectorAccessWindow
|
---|
| 58 | ; Parameters:
|
---|
| 59 | ; Stack: Segment part of ptr to Sector Access Window
|
---|
| 60 | ; ES:SI: Normalized ptr to buffer to receive data
|
---|
| 61 | ; SS:BP: Ptr to MEMPIOVARS
|
---|
| 62 | ; Returns:
|
---|
| 63 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
| 64 | ; AH: BIOS Error code
|
---|
| 65 | ; CX: Number of successfully transferred sectors
|
---|
[294] | 66 | ; CF: 0 if transfer successful
|
---|
[242] | 67 | ; 1 if any error
|
---|
| 68 | ; Corrupts registers:
|
---|
| 69 | ; AL, BX, DX, SI, ES
|
---|
| 70 | ;--------------------------------------------------------------------
|
---|
| 71 | ReadFromSectorAccessWindow:
|
---|
[267] | 72 | pop ds ; CS -> DS
|
---|
| 73 | mov di, si ; ES:DI = destination
|
---|
| 74 | mov si, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET ; DS:SI = source
|
---|
[238] | 75 |
|
---|
[242] | 76 | call WaitUntilReadyToTransferNextBlock
|
---|
| 77 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
|
---|
| 78 |
|
---|
[267] | 79 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
|
---|
[242] | 80 |
|
---|
[238] | 81 | ALIGN JUMP_ALIGN
|
---|
[242] | 82 | .ReadNextBlockFromDrive:
|
---|
[267] | 83 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
|
---|
[242] | 84 | jbe SHORT .ReadLastBlockFromDrive
|
---|
| 85 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
|
---|
| 86 | call WaitUntilReadyToTransferNextBlock
|
---|
| 87 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
|
---|
[238] | 88 |
|
---|
[242] | 89 | ; Increment number of successfully read WORDs
|
---|
[267] | 90 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
|
---|
| 91 | sub [bp+MEMPIOVARS.wWordsLeft], cx
|
---|
| 92 | add [bp+MEMPIOVARS.wWordsDone], cx
|
---|
[242] | 93 | jmp SHORT .ReadNextBlockFromDrive
|
---|
[238] | 94 |
|
---|
[242] | 95 | ALIGN JUMP_ALIGN
|
---|
| 96 | .ReadLastBlockFromDrive:
|
---|
[267] | 97 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
|
---|
[242] | 98 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
|
---|
| 99 |
|
---|
| 100 | ; Check for errors in last block
|
---|
| 101 | CheckErrorsAfterTransferringLastMemoryMappedBlock:
|
---|
| 102 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
|
---|
| 103 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
|
---|
| 104 | call IDEDEVICE%+Wait_PollStatusFlagInBLwithTimeoutInBH
|
---|
| 105 |
|
---|
| 106 | ; Return number of successfully transferred sectors
|
---|
| 107 | ReturnWithMemoryIOtransferErrorInAH:
|
---|
| 108 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
|
---|
[267] | 109 | mov cx, [bp+MEMPIOVARS.wWordsDone]
|
---|
[242] | 110 | jc SHORT .ConvertTransferredWordsInCXtoSectors
|
---|
[267] | 111 | add cx, [bp+MEMPIOVARS.wWordsLeft] ; Never sets CF
|
---|
[242] | 112 | .ConvertTransferredWordsInCXtoSectors:
|
---|
| 113 | xchg cl, ch
|
---|
| 114 | ret
|
---|
| 115 |
|
---|
| 116 |
|
---|
[238] | 117 | ;--------------------------------------------------------------------
|
---|
[242] | 118 | ; WriteToSectorAccessWindow
|
---|
[238] | 119 | ; Parameters:
|
---|
[242] | 120 | ; Stack: Segment part of ptr to Sector Access Window
|
---|
| 121 | ; ES:SI: Normalized ptr to buffer containing data
|
---|
[238] | 122 | ; SS:BP: Ptr to MEMPIOVARS
|
---|
| 123 | ; Returns:
|
---|
| 124 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
|
---|
| 125 | ; AH: BIOS Error code
|
---|
| 126 | ; CX: Number of successfully transferred sectors
|
---|
[294] | 127 | ; CF: 0 if transfer successful
|
---|
[238] | 128 | ; 1 if any error
|
---|
| 129 | ; Corrupts registers:
|
---|
| 130 | ; AL, BX, DX, SI, ES
|
---|
| 131 | ;--------------------------------------------------------------------
|
---|
[242] | 132 | ALIGN JUMP_ALIGN
|
---|
| 133 | WriteToSectorAccessWindow:
|
---|
| 134 | push es
|
---|
| 135 | pop ds
|
---|
| 136 | pop es ; CS -> ES
|
---|
| 137 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
|
---|
| 138 |
|
---|
[238] | 139 | ; Always poll when writing first block (IRQs are generated for following blocks)
|
---|
| 140 | call WaitUntilReadyToTransferNextBlock
|
---|
| 141 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
|
---|
| 142 |
|
---|
[267] | 143 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
|
---|
[242] | 144 |
|
---|
[238] | 145 | ALIGN JUMP_ALIGN
|
---|
| 146 | .WriteNextBlockToDrive:
|
---|
[267] | 147 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
|
---|
[238] | 148 | jbe SHORT .WriteLastBlockToDrive
|
---|
| 149 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
|
---|
| 150 | call WaitUntilReadyToTransferNextBlock
|
---|
| 151 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
|
---|
| 152 |
|
---|
| 153 | ; Increment number of successfully written WORDs
|
---|
[267] | 154 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
|
---|
| 155 | sub [bp+MEMPIOVARS.wWordsLeft], cx
|
---|
| 156 | add [bp+MEMPIOVARS.wWordsDone], cx
|
---|
[238] | 157 | jmp SHORT .WriteNextBlockToDrive
|
---|
| 158 |
|
---|
| 159 | ALIGN JUMP_ALIGN
|
---|
| 160 | .WriteLastBlockToDrive:
|
---|
[267] | 161 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
|
---|
[266] | 162 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock
|
---|
[242] | 163 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
|
---|
[238] | 164 |
|
---|
| 165 | ;--------------------------------------------------------------------
|
---|
| 166 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
|
---|
| 167 | ; Parameters:
|
---|
[242] | 168 | ; CH: Number of sectors in block
|
---|
[238] | 169 | ; DS:SI: Normalized ptr to source buffer
|
---|
| 170 | ; ES:DI: Ptr to Sector Access Window
|
---|
| 171 | ; Returns:
|
---|
| 172 | ; CX, DX: Zero
|
---|
| 173 | ; SI: Updated
|
---|
| 174 | ; Corrupts registers:
|
---|
[242] | 175 | ; BX
|
---|
[238] | 176 | ;--------------------------------------------------------------------
|
---|
| 177 | ALIGN JUMP_ALIGN
|
---|
| 178 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI:
|
---|
[242] | 179 | mov bx, di
|
---|
| 180 | eMOVZX dx, ch
|
---|
| 181 | xor cl, cl
|
---|
| 182 | ALIGN JUMP_ALIGN
|
---|
| 183 | .WriteBlock:
|
---|
| 184 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
|
---|
[238] | 185 | rep movsw
|
---|
[242] | 186 | mov di, bx ; Reset for next sector
|
---|
[238] | 187 | dec dx
|
---|
[242] | 188 | jnz SHORT .WriteBlock
|
---|
[238] | 189 | ret
|
---|
| 190 |
|
---|
| 191 |
|
---|
| 192 | ;--------------------------------------------------------------------
|
---|
| 193 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
|
---|
| 194 | ; Parameters:
|
---|
[242] | 195 | ; CH: Number of sectors in block
|
---|
| 196 | ; ES:DI: Normalized ptr to buffer to receive data (destination)
|
---|
[238] | 197 | ; DS:SI: Ptr to Sector Access Window (source)
|
---|
| 198 | ; Returns:
|
---|
| 199 | ; CX, DX: Zero
|
---|
| 200 | ; DI: Updated
|
---|
| 201 | ; Corrupts registers:
|
---|
[242] | 202 | ; BX
|
---|
[238] | 203 | ;--------------------------------------------------------------------
|
---|
| 204 | ALIGN JUMP_ALIGN
|
---|
| 205 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI:
|
---|
[242] | 206 | mov bx, si
|
---|
| 207 | eMOVZX dx, ch
|
---|
| 208 | xor cl, cl
|
---|
| 209 | ALIGN JUMP_ALIGN
|
---|
| 210 | .ReadBlock:
|
---|
| 211 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
|
---|
[238] | 212 | rep movsw
|
---|
[242] | 213 | mov si, bx ; Reset for next sector
|
---|
[238] | 214 | dec dx
|
---|
[242] | 215 | jnz SHORT .ReadBlock
|
---|
[238] | 216 | ret
|
---|
| 217 |
|
---|
| 218 |
|
---|
| 219 | ;--------------------------------------------------------------------
|
---|
| 220 | ; WaitUntilReadyToTransferNextBlock
|
---|
| 221 | ; Parameters:
|
---|
| 222 | ; SS:BP: Ptr to MEMPIOVARS
|
---|
| 223 | ; Returns:
|
---|
| 224 | ; AH: INT 13h Error Code
|
---|
| 225 | ; CF: Cleared if success, Set if error
|
---|
| 226 | ; Corrupts registers:
|
---|
| 227 | ; AL, BX, CX, DX
|
---|
| 228 | ;--------------------------------------------------------------------
|
---|
| 229 | ALIGN JUMP_ALIGN
|
---|
| 230 | WaitUntilReadyToTransferNextBlock:
|
---|
| 231 | push ds
|
---|
| 232 | push di
|
---|
| 233 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
|
---|
| 234 | call IDEDEVICE%+Wait_IRQorDRQ ; Always polls
|
---|
| 235 | pop di
|
---|
| 236 | pop ds
|
---|
| 237 | ret
|
---|
[242] | 238 |
|
---|
| 239 |
|
---|
| 240 | %if JRIDE_SECTOR_ACCESS_WINDOW_SIZE <> 512
|
---|
| 241 | %error "JRIDE_SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. MemIdeTransfer.asm needs changes."
|
---|
| 242 | %endif
|
---|
| 243 |
|
---|