[88] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Int 13h function AH=25h, Get Drive Information. |
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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 | ; Int 13h function AH=25h, Get Drive Information. |
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| 9 | ; |
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| 10 | ; AH25h_HandlerForGetDriveInformation |
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| 11 | ; Parameters: |
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[148] | 12 | ; ES: Same as in INTPACK |
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| 13 | ; DL: Translated Drive number |
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| 14 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 15 | ; SS:BP: Ptr to INTPACK |
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| 16 | ; Parameters on INTPACK in SS:BP: |
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[3] | 17 | ; ES:BX: Ptr to buffer to receive 512-byte drive information |
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[148] | 18 | ; Returns with INTPACK in SS:BP: |
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[3] | 19 | ; AH: Int 13h return status |
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| 20 | ; CF: 0 if succesfull, 1 if error |
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| 21 | ;-------------------------------------------------------------------- |
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| 22 | ALIGN JUMP_ALIGN |
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| 23 | AH25h_HandlerForGetDriveInformation: |
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| 24 | ; Wait until previously selected drive is ready |
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| 25 | call HDrvSel_SelectDriveAndDisableIRQ |
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[148] | 26 | jc SHORT .ReturnWithErrorCodeInAH ; Return if error |
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[3] | 27 | |
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| 28 | ; Get drive information |
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[148] | 29 | mov bx, [bp+INTPACK.bx] |
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[3] | 30 | call HPIO_NormalizeDataPointer |
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| 31 | push bx |
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| 32 | mov dx, [RAMVARS.wIdeBase] ; Load base port address |
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| 33 | eMOVZX bx, BYTE [di+DPT.bIdeOff] ; Load offset to IDEVARS |
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| 34 | mov bl, [cs:bx+IDEVARS.bBusType]; Load bus type to BL |
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| 35 | mov bh, [di+DPT.bDrvSel] ; Load drive sel byte to BH |
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| 36 | pop di ; Pop buffer offset to DI |
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| 37 | call AH25h_GetDriveInfo ; Get drive information |
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[148] | 38 | .ReturnWithErrorCodeInAH: |
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| 39 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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[3] | 40 | |
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| 41 | |
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| 42 | ;-------------------------------------------------------------------- |
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| 43 | ; Gets drive information using Identify Device command. |
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| 44 | ; |
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| 45 | ; AH25h_GetDriveInfo |
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| 46 | ; Parameters: |
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| 47 | ; BH: Drive Select byte for Drive and Head Select Register |
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| 48 | ; BL: Bus type |
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| 49 | ; DX: IDE Controller base port address |
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| 50 | ; DS: Segment to RAMVARS |
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| 51 | ; ES:DI: Ptr to buffer to receive 512 byte drive information |
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| 52 | ; Returns: |
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| 53 | ; AH: Int 13h return status (will be stored to BDA) |
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| 54 | ; CF: 0 if succesfull, 1 if error |
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| 55 | ; Corrupts registers: |
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| 56 | ; AL, CX |
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| 57 | ;-------------------------------------------------------------------- |
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| 58 | ALIGN JUMP_ALIGN |
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| 59 | AH25h_GetDriveInfo: |
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| 60 | push di |
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| 61 | push dx |
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| 62 | push bx |
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| 63 | |
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| 64 | ; Select Master or Slave drive. |
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| 65 | ; DO NOT WAIT UNTIL CURRENTLY SELECTED IS READY! |
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| 66 | ; It makes slave drive detection impossible if master is not present. |
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| 67 | mov [RAMVARS.wIdeBase], dx ; Store IDE Base port to RAMVARS |
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| 68 | add dx, BYTE REG_IDE_DRVHD ; DX to Drive and Head Sel Register |
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| 69 | mov al, bh ; Drive Select byte to AL |
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| 70 | out dx, al ; Select Master or Slave drive |
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| 71 | sub dx, BYTE REG_IDE_DRVHD ; Back to IDE Base port |
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[120] | 72 | |
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| 73 | ; Wait until ready to accept commands |
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| 74 | xor bh, bh ; BX now contains bus type |
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| 75 | mov cl, B_TIMEOUT_DRVINFO ; Load short timeout |
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| 76 | cmp [RAMVARS.bDrvCnt], bh ; Detecting first drive? |
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| 77 | eCMOVE cl, B_TIMEOUT_RESET ; If so, load long timeout |
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[3] | 78 | call HStatus_WaitRdy ; Wait until ready to accept commands |
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[148] | 79 | jc SHORT .ReturnWithErrorCodeInAH |
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[3] | 80 | |
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| 81 | ; Output command |
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| 82 | mov al, HCMD_ID_DEV ; Load Identify Device command to AL |
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| 83 | out dx, al ; Output command |
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| 84 | call HStatus_WaitDrqDefTime ; Wait until ready to transfer (no IRQ!) |
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[148] | 85 | jc SHORT .ReturnWithErrorCodeInAH |
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[3] | 86 | |
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| 87 | ; Transfer data |
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| 88 | sub dx, BYTE REGR_IDE_ST ; DX to IDE Data Reg |
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| 89 | mov cx, 256 ; Transfer 256 words (single sector) |
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| 90 | cld ; INSW to increment DI |
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| 91 | call [cs:bx+g_rgfnPioRead] ; Read ID sector |
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| 92 | call HStatus_WaitRdyDefTime ; Wait until drive ready |
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| 93 | |
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[148] | 94 | .ReturnWithErrorCodeInAH: |
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[3] | 95 | pop bx |
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| 96 | pop dx |
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| 97 | pop di |
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| 98 | ret |
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