[3] | 1 | ; File name : HStatus.asm |
---|
| 2 | ; Project name : IDE BIOS |
---|
| 3 | ; Created date : 15.12.2009 |
---|
[28] | 4 | ; Last update : 1.8.2010 |
---|
[3] | 5 | ; Author : Tomi Tilli |
---|
| 6 | ; Description : IDE Status Register polling functions. |
---|
| 7 | |
---|
| 8 | ; Section containing code |
---|
| 9 | SECTION .text |
---|
| 10 | |
---|
| 11 | ;-------------------------------------------------------------------- |
---|
| 12 | ; Waits Hard Disk IRQ when not transferring data. |
---|
| 13 | ; If interrupts are disabled, RDY flag is polled. |
---|
| 14 | ; |
---|
| 15 | ; HStatus_WaitIrqOrRdy |
---|
| 16 | ; Parameters: |
---|
| 17 | ; DS:BX: Ptr to DPT |
---|
| 18 | ; Returns: |
---|
| 19 | ; AH: BIOS Error code |
---|
| 20 | ; CF: 0 if wait succesfull |
---|
| 21 | ; 1 if any error |
---|
| 22 | ; Corrupts registers: |
---|
| 23 | ; AL, CX, DX |
---|
| 24 | ;-------------------------------------------------------------------- |
---|
| 25 | ALIGN JUMP_ALIGN |
---|
| 26 | HStatus_WaitIrqOrRdy: |
---|
[26] | 27 | test BYTE [bx+DPT.bDrvCtrl], FLG_IDE_CTRL_nIEN |
---|
[28] | 28 | jnz SHORT .PollRdySinceInterruptsAreDisabled |
---|
[10] | 29 | jmp HIRQ_WaitIRQ |
---|
[28] | 30 | |
---|
[10] | 31 | ALIGN JUMP_ALIGN |
---|
[28] | 32 | .PollRdySinceInterruptsAreDisabled: |
---|
[3] | 33 | mov cl, B_TIMEOUT_DRQ ; Load DRQ (not RDY) timeout |
---|
| 34 | jmp SHORT HStatus_WaitRdy ; Jump to poll RDY |
---|
| 35 | |
---|
| 36 | |
---|
| 37 | ;-------------------------------------------------------------------- |
---|
| 38 | ; Waits until Hard Disk is ready to transfer data. |
---|
| 39 | ; |
---|
| 40 | ; HStatus_WaitIrqOrDrq |
---|
| 41 | ; Parameters: |
---|
| 42 | ; DS:BX: Ptr to DPT (in RAMVARS segment) |
---|
| 43 | ; Returns: |
---|
| 44 | ; AH: BIOS Error code |
---|
| 45 | ; CF: 0 if wait succesfull |
---|
| 46 | ; 1 if any error |
---|
| 47 | ; Corrupts registers: |
---|
| 48 | ; AL |
---|
| 49 | ;-------------------------------------------------------------------- |
---|
| 50 | ALIGN JUMP_ALIGN |
---|
| 51 | HStatus_WaitIrqOrDrq: |
---|
| 52 | test BYTE [bx+DPT.bDrvCtrl], FLG_IDE_CTRL_nIEN |
---|
[28] | 53 | jnz SHORT .PollDrqSinceInterruptsAreDisabled |
---|
| 54 | jmp HIRQ_WaitIRQ |
---|
[3] | 55 | |
---|
| 56 | ALIGN JUMP_ALIGN |
---|
[28] | 57 | .PollDrqSinceInterruptsAreDisabled: |
---|
| 58 | push dx |
---|
| 59 | push cx |
---|
[3] | 60 | call HStatus_WaitDrqDefTime |
---|
| 61 | pop cx |
---|
| 62 | pop dx |
---|
| 63 | ret |
---|
| 64 | |
---|
| 65 | |
---|
| 66 | ;-------------------------------------------------------------------- |
---|
| 67 | ; Waits until busy flag is cleared from selected Hard Disk drive. |
---|
| 68 | ; |
---|
| 69 | ; HStatus_WaitBsyDefTime Uses default timeout |
---|
| 70 | ; HStatus_WaitBsy Uses user defined timeout |
---|
| 71 | ; HStatus_WaitBsyBase Uses user base port address and timeout |
---|
| 72 | ; Parameters: |
---|
| 73 | ; CL: Timeout value in system timer ticks (not HStatus_WaitBsyDefTime) |
---|
| 74 | ; DX: IDE Base port address (HUtil_WaitBsyBase only) |
---|
| 75 | ; DS: Segment to RAMVARS |
---|
| 76 | ; Returns: |
---|
| 77 | ; AH: BIOS Error code |
---|
| 78 | ; DX: IDE Status Register Address |
---|
| 79 | ; CF: 0 if wait succesfull |
---|
| 80 | ; 1 if any error |
---|
| 81 | ; Corrupts registers: |
---|
| 82 | ; AL, CX |
---|
| 83 | ;-------------------------------------------------------------------- |
---|
| 84 | ALIGN JUMP_ALIGN |
---|
| 85 | HStatus_WaitBsyDefTime: |
---|
| 86 | mov cl, B_TIMEOUT_BSY ; Load timeout value |
---|
| 87 | ALIGN JUMP_ALIGN |
---|
| 88 | HStatus_WaitBsy: |
---|
| 89 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
---|
| 90 | ALIGN JUMP_ALIGN |
---|
| 91 | HStatus_WaitBsyBase: |
---|
| 92 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
---|
| 93 | jmp SHORT HStatus_PollBsy ; Wait until not busy |
---|
| 94 | |
---|
| 95 | |
---|
| 96 | ;-------------------------------------------------------------------- |
---|
| 97 | ; Waits until Hard Disk is ready to accept commands. |
---|
| 98 | ; |
---|
| 99 | ; HStatus_WaitRdyDefTime Uses default timeout |
---|
| 100 | ; HStatus_WaitRdy Uses user defined timeout |
---|
| 101 | ; HStatus_WaitRdyBase Uses user base port address and timeout |
---|
| 102 | ; Parameters: |
---|
| 103 | ; CL: Timeout value in system timer ticks (not HStatus_WaitRdyDefTime) |
---|
| 104 | ; DX: IDE Base port address (HStatus_WaitRdyBase only) |
---|
| 105 | ; DS: Segment to RAMVARS |
---|
| 106 | ; Returns: |
---|
| 107 | ; AH: BIOS Error code |
---|
| 108 | ; DX: IDE Status Register Address |
---|
| 109 | ; CF: 0 if wait succesfull |
---|
| 110 | ; 1 if any error |
---|
| 111 | ; Corrupts registers: |
---|
| 112 | ; AL, CX |
---|
| 113 | ;-------------------------------------------------------------------- |
---|
| 114 | ALIGN JUMP_ALIGN |
---|
| 115 | HStatus_WaitRdyDefTime: |
---|
| 116 | mov cl, B_TIMEOUT_RDY ; Load timeout value |
---|
| 117 | ALIGN JUMP_ALIGN |
---|
| 118 | HStatus_WaitRdy: |
---|
| 119 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
---|
| 120 | ALIGN JUMP_ALIGN |
---|
| 121 | HStatus_WaitRdyBase: |
---|
| 122 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
---|
| 123 | mov ah, FLG_IDE_ST_DRDY ; Flag to poll |
---|
| 124 | jmp SHORT HStatus_PollBsyAndFlg ; Wait until flag set |
---|
| 125 | |
---|
| 126 | |
---|
| 127 | ;-------------------------------------------------------------------- |
---|
| 128 | ; Waits until Hard Disk is ready to transfer data. |
---|
| 129 | ; Note! This function polls DRQ even if interrupts are enabled! |
---|
| 130 | ; |
---|
| 131 | ; HStatus_WaitDrqDefTime Uses default timeout |
---|
| 132 | ; HStatus_WaitDrq Uses user defined timeout |
---|
| 133 | ; HStatus_WaitDrqBase Uses user base port address and timeout |
---|
| 134 | ; Parameters: |
---|
| 135 | ; CL: Timeout value in system timer ticks (not HStatus_WaitDrqDefTime) |
---|
| 136 | ; DX: IDE Base port address (HStatus_WaitDrqBase only) |
---|
| 137 | ; DS: Segment to RAMVARS |
---|
| 138 | ; Returns: |
---|
| 139 | ; AH: BIOS Error code |
---|
| 140 | ; DX: IDE Status Register Address |
---|
| 141 | ; CF: 0 if wait succesfull |
---|
| 142 | ; 1 if any error |
---|
| 143 | ; Corrupts registers: |
---|
| 144 | ; AL, CX |
---|
| 145 | ;-------------------------------------------------------------------- |
---|
| 146 | ALIGN JUMP_ALIGN |
---|
| 147 | HStatus_WaitDrqDefTime: |
---|
| 148 | mov cl, B_TIMEOUT_DRQ ; Load timeout value |
---|
| 149 | ALIGN JUMP_ALIGN |
---|
| 150 | HStatus_WaitDrq: |
---|
| 151 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
---|
| 152 | ALIGN JUMP_ALIGN |
---|
| 153 | HStatus_WaitDrqBase: |
---|
| 154 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
---|
| 155 | mov ah, FLG_IDE_ST_DRQ ; Flag to poll |
---|
| 156 | ; Fall to HStatus_PollBsyAndFlg |
---|
| 157 | |
---|
| 158 | ;-------------------------------------------------------------------- |
---|
| 159 | ; IDE Status register polling. |
---|
| 160 | ; This function first waits until controller is not busy. |
---|
[27] | 161 | ; When not busy, IDE Status Register is polled until wanted flag is set. |
---|
[3] | 162 | ; |
---|
| 163 | ; HStatus_PollBusyAndFlg |
---|
| 164 | ; Parameters: |
---|
| 165 | ; AH: Status Register Flag to poll (until set) when not busy |
---|
| 166 | ; CL: Timeout value in system timer ticks |
---|
| 167 | ; DX: IDE Status Register Address |
---|
| 168 | ; DS: Segment to RAMVARS |
---|
| 169 | ; Returns: |
---|
| 170 | ; AH: BIOS Error code |
---|
| 171 | ; CF: Clear if wait completed successfully (no errors) |
---|
| 172 | ; Set if any error |
---|
| 173 | ; Corrupts registers: |
---|
| 174 | ; AL, CX |
---|
| 175 | ;-------------------------------------------------------------------- |
---|
| 176 | ALIGN JUMP_ALIGN |
---|
| 177 | HStatus_PollBsyAndFlg: |
---|
[27] | 178 | call SoftDelay_InitTimeout ; Initialize timeout counter |
---|
[28] | 179 | in al, dx ; Discard contents for first read |
---|
| 180 | ; (should read Alternate Status Register) |
---|
[3] | 181 | ALIGN JUMP_ALIGN |
---|
| 182 | .PollLoop: |
---|
[27] | 183 | in al, dx ; Load IDE Status Register |
---|
| 184 | test al, FLG_IDE_ST_BSY ; Controller busy? |
---|
| 185 | jnz SHORT .UpdateTimeout ; If so, jump to timeout update |
---|
| 186 | test al, ah ; Test secondary flag |
---|
| 187 | jnz SHORT GetErrorCodeFromPollingToAH ; If set, break loop |
---|
[3] | 188 | ALIGN JUMP_ALIGN |
---|
| 189 | .UpdateTimeout: |
---|
[27] | 190 | call SoftDelay_UpdTimeout ; Update timeout counter |
---|
| 191 | jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout) |
---|
[28] | 192 | jmp HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit |
---|
[3] | 193 | |
---|
| 194 | ;-------------------------------------------------------------------- |
---|
| 195 | ; IDE Status register polling. |
---|
| 196 | ; This function waits until controller is not busy. |
---|
| 197 | ; |
---|
| 198 | ; HStatus_PollBsy |
---|
| 199 | ; Parameters: |
---|
| 200 | ; CL: Timeout value in system timer ticks |
---|
| 201 | ; DX: IDE Status Register Address |
---|
| 202 | ; DS: Segment to RAMVARS |
---|
| 203 | ; Returns: |
---|
| 204 | ; AH: BIOS Error code |
---|
| 205 | ; CF: Clear if wait completed successfully (no errors) |
---|
| 206 | ; Set if any error |
---|
| 207 | ; Corrupts registers: |
---|
| 208 | ; AL, CX |
---|
| 209 | ;-------------------------------------------------------------------- |
---|
| 210 | ALIGN JUMP_ALIGN |
---|
| 211 | HStatus_PollBsy: |
---|
[27] | 212 | call SoftDelay_InitTimeout ; Initialize timeout counter |
---|
[28] | 213 | in al, dx ; Discard contents for first read |
---|
| 214 | ; (should read Alternate Status Register) |
---|
[3] | 215 | ALIGN JUMP_ALIGN |
---|
| 216 | .PollLoop: |
---|
[27] | 217 | in al, dx ; Load IDE Status Reg |
---|
| 218 | test al, FLG_IDE_ST_BSY ; Controller busy? |
---|
| 219 | jz SHORT GetErrorCodeFromPollingToAH ; If not, jump to check errors |
---|
| 220 | call SoftDelay_UpdTimeout ; Update timeout counter |
---|
| 221 | jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout) |
---|
[3] | 222 | ALIGN JUMP_ALIGN |
---|
[27] | 223 | GetErrorCodeFromPollingToAH: |
---|
[28] | 224 | jmp HError_ProcessErrorsAfterPollingBSY |
---|