| 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : IDE Status Register polling functions. |
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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 | ; Waits Hard Disk IRQ when not transferring data. |
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| 9 | ; If interrupts are disabled, RDY flag is polled. |
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| 10 | ; |
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| 11 | ; HStatus_WaitIrqOrRdy |
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| 12 | ; Parameters: |
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| 13 | ; DS:BX: Ptr to DPT |
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| 14 | ; Returns: |
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| 15 | ; AH: BIOS Error code |
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| 16 | ; CF: 0 if wait succesfull |
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| 17 | ; 1 if any error |
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| 18 | ; Corrupts registers: |
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| 19 | ; AL, CX, DX |
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| 20 | ;-------------------------------------------------------------------- |
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| 21 | ALIGN JUMP_ALIGN |
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| 22 | HStatus_WaitIrqOrRdy: |
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| 23 | call HIRQ_WaitForIRQ |
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| 24 | jnc SHORT .PollRdySinceNoWaitingOnOsHook |
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| 25 | jmp HError_ProcessErrorsAfterPollingBSY |
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| 26 | |
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| 27 | ALIGN JUMP_ALIGN |
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| 28 | .PollRdySinceNoWaitingOnOsHook: |
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| 29 | mov cl, B_TIMEOUT_DRQ ; Load DRQ (not RDY) timeout |
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| 30 | jmp SHORT HStatus_WaitRdy ; Jump to poll RDY |
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| 31 | |
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| 32 | |
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| 33 | ;-------------------------------------------------------------------- |
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| 34 | ; Waits until Hard Disk is ready to transfer data. |
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| 35 | ; |
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| 36 | ; HStatus_WaitIrqOrDrq |
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| 37 | ; Parameters: |
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| 38 | ; DS:BX: Ptr to DPT (in RAMVARS segment) |
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| 39 | ; Returns: |
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| 40 | ; AH: BIOS Error code |
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| 41 | ; CF: 0 if wait succesfull |
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| 42 | ; 1 if any error |
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| 43 | ; Corrupts registers: |
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| 44 | ; AL |
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| 45 | ;-------------------------------------------------------------------- |
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| 46 | ALIGN JUMP_ALIGN |
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| 47 | HStatus_WaitIrqOrDrq: |
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| 48 | call HIRQ_WaitForIRQ |
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| 49 | jnc SHORT .PollDrqSinceNoWaitingOnOsHook |
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| 50 | jmp HError_ProcessErrorsAfterPollingBSY |
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| 51 | |
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| 52 | ALIGN JUMP_ALIGN |
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| 53 | .PollDrqSinceNoWaitingOnOsHook: |
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| 54 | push dx |
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| 55 | push cx |
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| 56 | call HStatus_WaitDrqDefTime |
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| 57 | pop cx |
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| 58 | pop dx |
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| 59 | ret |
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| 60 | |
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| 61 | |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ; Waits until busy flag is cleared from selected Hard Disk drive. |
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| 64 | ; |
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| 65 | ; HStatus_WaitBsyDefTime Uses default timeout |
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| 66 | ; HStatus_WaitBsy Uses user defined timeout |
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| 67 | ; HStatus_WaitBsyBase Uses user base port address and timeout |
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| 68 | ; Parameters: |
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| 69 | ; CL: Timeout value in system timer ticks (not HStatus_WaitBsyDefTime) |
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| 70 | ; DX: IDE Base port address (HUtil_WaitBsyBase only) |
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| 71 | ; DS: Segment to RAMVARS |
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| 72 | ; Returns: |
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| 73 | ; AH: BIOS Error code |
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| 74 | ; DX: IDE Status Register Address |
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| 75 | ; CF: 0 if wait succesfull |
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| 76 | ; 1 if any error |
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| 77 | ; Corrupts registers: |
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| 78 | ; AL, CX |
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| 79 | ;-------------------------------------------------------------------- |
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| 80 | ALIGN JUMP_ALIGN |
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| 81 | HStatus_WaitBsyDefTime: |
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| 82 | mov cl, B_TIMEOUT_BSY ; Load timeout value |
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| 83 | ALIGN JUMP_ALIGN |
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| 84 | HStatus_WaitBsy: |
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| 85 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
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| 86 | ALIGN JUMP_ALIGN |
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| 87 | HStatus_WaitBsyBase: |
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| 88 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
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| 89 | jmp SHORT HStatus_PollBsy ; Wait until not busy |
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| 90 | |
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| 91 | |
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| 92 | ;-------------------------------------------------------------------- |
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| 93 | ; Waits until Hard Disk is ready to accept commands. |
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| 94 | ; |
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| 95 | ; HStatus_WaitRdyDefTime Uses default timeout |
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| 96 | ; HStatus_WaitRdy Uses user defined timeout |
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| 97 | ; HStatus_WaitRdyBase Uses user base port address and timeout |
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| 98 | ; Parameters: |
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| 99 | ; CL: Timeout value in system timer ticks (not HStatus_WaitRdyDefTime) |
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| 100 | ; DX: IDE Base port address (HStatus_WaitRdyBase only) |
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| 101 | ; DS: Segment to RAMVARS |
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| 102 | ; Returns: |
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| 103 | ; AH: BIOS Error code |
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| 104 | ; DX: IDE Status Register Address |
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| 105 | ; CF: 0 if wait succesfull |
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| 106 | ; 1 if any error |
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| 107 | ; Corrupts registers: |
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| 108 | ; AL, CX |
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| 109 | ;-------------------------------------------------------------------- |
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| 110 | ALIGN JUMP_ALIGN |
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| 111 | HStatus_WaitRdyDefTime: |
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| 112 | mov cl, B_TIMEOUT_RDY ; Load timeout value |
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| 113 | ALIGN JUMP_ALIGN |
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| 114 | HStatus_WaitRdy: |
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| 115 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
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| 116 | ALIGN JUMP_ALIGN |
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| 117 | HStatus_WaitRdyBase: |
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| 118 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
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| 119 | mov ah, FLG_IDE_ST_DRDY ; Flag to poll |
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| 120 | jmp SHORT HStatus_PollBsyAndFlg ; Wait until flag set |
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| 121 | |
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| 122 | |
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| 123 | ;-------------------------------------------------------------------- |
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| 124 | ; Waits until Hard Disk is ready to transfer data. |
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| 125 | ; Note! This function polls DRQ even if interrupts are enabled! |
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| 126 | ; |
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| 127 | ; HStatus_WaitDrqDefTime Uses default timeout |
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| 128 | ; HStatus_WaitDrq Uses user defined timeout |
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| 129 | ; HStatus_WaitDrqBase Uses user base port address and timeout |
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| 130 | ; Parameters: |
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| 131 | ; CL: Timeout value in system timer ticks (not HStatus_WaitDrqDefTime) |
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| 132 | ; DX: IDE Base port address (HStatus_WaitDrqBase only) |
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| 133 | ; DS: Segment to RAMVARS |
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| 134 | ; Returns: |
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| 135 | ; AH: BIOS Error code |
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| 136 | ; DX: IDE Status Register Address |
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| 137 | ; CF: 0 if wait succesfull |
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| 138 | ; 1 if any error |
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| 139 | ; Corrupts registers: |
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| 140 | ; AL, CX |
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| 141 | ;-------------------------------------------------------------------- |
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| 142 | ALIGN JUMP_ALIGN |
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| 143 | HStatus_WaitDrqDefTime: |
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| 144 | mov cl, B_TIMEOUT_DRQ ; Load timeout value |
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| 145 | ALIGN JUMP_ALIGN |
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| 146 | HStatus_WaitDrq: |
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| 147 | mov dx, [RAMVARS.wIdeBase] ; Load offset to base port |
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| 148 | ALIGN JUMP_ALIGN |
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| 149 | HStatus_WaitDrqBase: |
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| 150 | add dx, BYTE REGR_IDE_ST ; Add offset to status reg |
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| 151 | mov ah, FLG_IDE_ST_DRQ ; Flag to poll |
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| 152 | ; Fall to HStatus_PollBsyAndFlg |
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| 153 | |
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| 154 | ;-------------------------------------------------------------------- |
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| 155 | ; IDE Status register polling. |
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| 156 | ; This function first waits until controller is not busy. |
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| 157 | ; When not busy, IDE Status Register is polled until wanted flag is set. |
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| 158 | ; |
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| 159 | ; HStatus_PollBusyAndFlg |
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| 160 | ; Parameters: |
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| 161 | ; AH: Status Register Flag to poll (until set) when not busy |
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| 162 | ; CL: Timeout value in system timer ticks |
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| 163 | ; DX: IDE Status Register Address |
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| 164 | ; DS: Segment to RAMVARS |
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| 165 | ; Returns: |
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| 166 | ; AH: BIOS Error code |
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| 167 | ; CF: Clear if wait completed successfully (no errors) |
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| 168 | ; Set if any error |
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| 169 | ; Corrupts registers: |
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| 170 | ; AL, CX |
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| 171 | ;-------------------------------------------------------------------- |
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| 172 | ALIGN JUMP_ALIGN |
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| 173 | HStatus_PollBsyAndFlg: |
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| 174 | call InitializeTimeoutWithTicksInCL ; Initialize timeout counter |
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| 175 | in al, dx ; Discard contents for first read |
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| 176 | ; (should read Alternate Status Register) |
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| 177 | ALIGN JUMP_ALIGN |
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| 178 | .PollLoop: |
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| 179 | in al, dx ; Load IDE Status Register |
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| 180 | test al, FLG_IDE_ST_BSY ; Controller busy? |
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| 181 | jnz SHORT .UpdateTimeout ; If so, jump to timeout update |
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| 182 | test al, ah ; Test secondary flag |
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| 183 | jnz SHORT GetErrorCodeFromPollingToAH ; If set, break loop |
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| 184 | ALIGN JUMP_ALIGN |
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| 185 | .UpdateTimeout: |
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| 186 | call SetCFifTimeout |
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| 187 | jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout) |
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| 188 | jmp HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit |
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| 189 | |
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| 190 | ;-------------------------------------------------------------------- |
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| 191 | ; IDE Status register polling. |
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| 192 | ; This function waits until controller is not busy. |
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| 193 | ; |
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| 194 | ; HStatus_PollBsy |
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| 195 | ; Parameters: |
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| 196 | ; CL: Timeout value in system timer ticks |
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| 197 | ; DX: IDE Status Register Address |
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| 198 | ; DS: Segment to RAMVARS |
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| 199 | ; Returns: |
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| 200 | ; AH: BIOS Error code |
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| 201 | ; CF: Clear if wait completed successfully (no errors) |
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| 202 | ; Set if any error |
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| 203 | ; Corrupts registers: |
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| 204 | ; AL, CX |
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| 205 | ;-------------------------------------------------------------------- |
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| 206 | ALIGN JUMP_ALIGN |
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| 207 | HStatus_PollBsy: |
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| 208 | call InitializeTimeoutWithTicksInCL ; Initialize timeout counter |
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| 209 | in al, dx ; Discard contents for first read |
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| 210 | ; (should read Alternate Status Register) |
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| 211 | ALIGN JUMP_ALIGN |
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| 212 | .PollLoop: |
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| 213 | in al, dx ; Load IDE Status Reg |
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| 214 | test al, FLG_IDE_ST_BSY ; Controller busy? |
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| 215 | jz SHORT GetErrorCodeFromPollingToAH ; If not, jump to check errors |
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| 216 | call SetCFifTimeout ; Update timeout counter |
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| 217 | jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout) |
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| 218 | ALIGN JUMP_ALIGN |
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| 219 | GetErrorCodeFromPollingToAH: |
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| 220 | jmp HError_ProcessErrorsAfterPollingBSY |
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| 221 | |
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| 222 | |
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| 223 | ;-------------------------------------------------------------------- |
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| 224 | ; InitializeTimeoutWithTicksInCL |
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| 225 | ; Parameters: |
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| 226 | ; CL: Timeout value in system timer ticks |
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| 227 | ; DS: Segment to RAMVARS |
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| 228 | ; Returns: |
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| 229 | ; Nothing |
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| 230 | ; Corrupts registers: |
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| 231 | ; CX |
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| 232 | ;-------------------------------------------------------------------- |
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| 233 | ALIGN JUMP_ALIGN |
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| 234 | InitializeTimeoutWithTicksInCL: |
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| 235 | push bx |
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| 236 | xchg cx, ax |
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| 237 | |
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| 238 | xor ah, ah ; Timeout ticks now in AX |
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| 239 | mov bx, RAMVARS.wTimeoutCounter |
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| 240 | call TimerTicks_InitializeTimeoutFromAX |
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| 241 | |
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| 242 | xchg ax, cx ; Restore AX |
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| 243 | pop bx |
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| 244 | ret |
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| 245 | |
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| 246 | ;-------------------------------------------------------------------- |
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| 247 | ; SetCFifTimeout |
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| 248 | ; Parameters: |
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| 249 | ; DS: Segment to RAMVARS |
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| 250 | ; Returns: |
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| 251 | ; Nothing |
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| 252 | ; Corrupts registers: |
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| 253 | ; CX |
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| 254 | ;-------------------------------------------------------------------- |
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| 255 | ALIGN JUMP_ALIGN |
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| 256 | SetCFifTimeout: |
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| 257 | push bx |
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| 258 | xchg cx, ax |
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| 259 | |
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| 260 | mov bx, RAMVARS.wTimeoutCounter |
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| 261 | call TimerTicks_GetTimeoutTicksLeftToAXfromDSBX |
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| 262 | |
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| 263 | xchg ax, cx ; Restore AX |
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| 264 | pop bx |
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| 265 | ret |
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