| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : IDE Device wait 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 | ; IdeWait_IRQorDRQ
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| 9 | ; Parameters:
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| 10 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 11 | ; SS:BP: Ptr to IDEPACK or PIOVARS
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| 12 | ; Returns:
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| 13 | ; AH: INT 13h Error Code
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| 14 | ; CF: Cleared if success, Set if error
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| 15 | ; Corrupts registers:
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| 16 | ; AL, BX, CX, DX
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| 17 | ;--------------------------------------------------------------------
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| 18 | IdeWait_IRQorDRQ:
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| 19 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
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| 20 | test BYTE [bp+IDEPACK.bDeviceControl], FLG_DEVCONTROL_nIEN
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| 21 | jnz SHORT IdeWait_PollStatusFlagInBLwithTimeoutInBH ; Interrupt disabled
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| 22 | ; Fall to IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
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| 23 |
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| 24 |
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| 25 | ;--------------------------------------------------------------------
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| 26 | ; IdeWait_IRQorStatusFlagInBLwithTimeoutInBH
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| 27 | ; Parameters:
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| 28 | ; BH: Timeout ticks
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| 29 | ; BL: IDE Status Register bit to wait
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| 30 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 31 | ; Returns:
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| 32 | ; AH: INT 13h Error Code
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| 33 | ; CF: Cleared if success, Set if error
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| 34 | ; Corrupts registers:
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| 35 | ; AL, BX, CX, DX
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| 36 | ;--------------------------------------------------------------------
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| 37 | IdeWait_IRQorStatusFlagInBLwithTimeoutInBH:
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| 38 | call IdeIrq_WaitForIRQ
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| 39 | ; Always fall to IdeWait_PollStatusFlagInBLwithTimeoutInBH for error processing
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| 40 |
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| 41 |
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| 42 | ;--------------------------------------------------------------------
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| 43 | ; IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 44 | ; Parameters:
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| 45 | ; BH: Timeout ticks
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| 46 | ; BL: IDE Status Register bit to poll
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| 47 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 48 | ; Returns:
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| 49 | ; AH: INT 13h Error Code
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| 50 | ; CF: Cleared if success, Set if error
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| 51 | ; Corrupts registers:
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| 52 | ; AL, BX, CX, DX
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| 53 | ;--------------------------------------------------------------------
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| 54 | IdeWait_PollStatusFlagInBLwithTimeoutInBH:
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| 55 | mov ah, bl
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| 56 | mov cl, bh
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| 57 | call Timer_InitializeTimeoutWithTicksInCL
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| 58 | and ah, ~FLG_STATUS_BSY
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| 59 | jz SHORT PollBsyOnly
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| 60 | ; Fall to PollBsyAndFlgInAH
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| 61 |
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| 62 | ;--------------------------------------------------------------------
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| 63 | ; PollBsyAndFlgInAH
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| 64 | ; Parameters:
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| 65 | ; AH: Status Register Flag to poll (until set) when device not busy
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| 66 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 67 | ; Returns:
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| 68 | ; AH: BIOS Error code
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| 69 | ; CF: Clear if wait completed successfully (no errors)
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| 70 | ; Set if any error
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| 71 | ; Corrupts registers:
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| 72 | ; AL, BX, CX, DX
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| 73 | ;--------------------------------------------------------------------
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| 74 | PollBsyAndFlgInAH:
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| 75 | call ReadIdeStatusRegisterToAL ; Discard contents for first read
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| 76 | ALIGN JUMP_ALIGN
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| 77 | .PollLoop:
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| 78 | call ReadIdeStatusRegisterToAL
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| 79 | test al, FLG_STATUS_BSY ; Controller busy?
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| 80 | jnz SHORT .UpdateTimeout ; If so, jump to timeout update
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| 81 | test al, ah ; Test secondary flag
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| 82 | jnz SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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| 83 | .UpdateTimeout:
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| 84 | call Timer_SetCFifTimeout
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| 85 | jnc SHORT .PollLoop ; Loop if time left
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| 86 | call IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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| 87 | jc SHORT .ReturnErrorCodeInAH
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| 88 | mov ah, RET_HD_TIMEOUT ; Expected bit never got set
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| 89 | stc
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| 90 | .ReturnErrorCodeInAH:
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| 91 | ret
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| 92 |
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| 93 |
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| 94 | ;--------------------------------------------------------------------
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| 95 | ; PollBsyOnly
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| 96 | ; Parameters:
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| 97 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 98 | ; Returns:
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| 99 | ; AH: BIOS Error code
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| 100 | ; CF: Clear if wait completed successfully (no errors)
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| 101 | ; Set if any error
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| 102 | ; Corrupts registers:
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| 103 | ; AL, BX, CX, DX
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| 104 | ;--------------------------------------------------------------------
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| 105 | PollBsyOnly:
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| 106 | call ReadIdeStatusRegisterToAL ; Discard contents for first read
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| 107 | ALIGN JUMP_ALIGN
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| 108 | .PollLoop:
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| 109 | call ReadIdeStatusRegisterToAL
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| 110 | test al, FLG_STATUS_BSY ; Controller busy?
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| 111 | jz SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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| 112 | call Timer_SetCFifTimeout ; Update timeout counter
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| 113 | jnc SHORT .PollLoop ; Loop if time left (sets CF on timeout)
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| 114 | jmp SHORT IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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| 115 |
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| 116 |
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| 117 | ;--------------------------------------------------------------------
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| 118 | ; ReadIdeStatusRegisterToAL
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| 119 | ; Parameters:
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| 120 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 121 | ; Returns:
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| 122 | ; AL: IDE Status Register contents
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| 123 | ; Corrupts registers:
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| 124 | ; BX, DX
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| 125 | ;--------------------------------------------------------------------
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| 126 | ALIGN JUMP_ALIGN
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| 127 | ReadIdeStatusRegisterToAL:
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| 128 | mov dl, STATUS_REGISTER_in
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| 129 | jmp IdeIO_InputToALfromIdeRegisterInDL
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