[116] | 1 | ; Project name : XTIDE Universal BIOS
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[3] | 2 | ; Description : PIO transfer functions.
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| 3 |
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| 4 | ; Structure containing variables for PIO transfer functions
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[86] | 5 | struc PIOVARS, -6
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[3] | 6 | .fnXfer resb 2 ; Offset to transfer function
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| 7 | .wBlockSize resb 2 ; Block size in WORDs
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| 8 | .wWordsLeft resb 2 ; Number of WORDs left to transfer
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| 9 | ; (full sectors, can be partial block)
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| 10 | endstruc
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| 11 |
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| 12 |
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| 13 | ; Section containing code
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| 14 | SECTION .text
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| 15 |
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| 16 | ;--------------------------------------------------------------------
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| 17 | ; Reads sectors from hard disk using PIO transfer mode.
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| 18 | ;
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| 19 | ; HPIO_ReadBlock
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| 20 | ; Parameters:
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| 21 | ; AL: Number of sectors to read (1...255)
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| 22 | ; ES:BX: Pointer to buffer to recieve data
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| 23 | ; DS:DI: Ptr to Disk Parameter Table
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| 24 | ; Returns:
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| 25 | ; AH: BIOS Error code
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| 26 | ; CF: 0 if transfer succesfull
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| 27 | ; 1 if any error
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| 28 | ; Corrupts registers:
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| 29 | ; AL, BX, CX, DX
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| 30 | ;--------------------------------------------------------------------
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| 31 | ALIGN JUMP_ALIGN
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| 32 | HPIO_ReadBlock:
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| 33 | push es
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| 34 |
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| 35 | ; Create PIOVARS to stack
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| 36 | eENTER PIOVARS_size, 0
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[86] | 37 |
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[3] | 38 | push si
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| 39 | mov si, g_rgfnPioRead ; Offset to read function lookup
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| 40 | call HPIO_InitializePIOVARS ; Store word count and block size
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| 41 | pop si
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| 42 |
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| 43 | ; Start to read data
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| 44 | xchg bx, di ; DS:BX points DPT, ES:DI points buffer
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| 45 | mov dx, [RAMVARS.wIdeBase] ; Load IDE Base Port address
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| 46 | call HPIO_ReadFromDrive
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| 47 |
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| 48 | ; Destroy stack frame
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| 49 | eLEAVE
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| 50 | mov di, bx ; Restore DI
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| 51 | pop es
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| 52 | ret
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| 53 |
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| 54 |
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| 55 | ;--------------------------------------------------------------------
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| 56 | ; Initializes PIOVARS members.
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| 57 | ;
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| 58 | ; HPIO_InitializePIOVARS
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| 59 | ; Parameters:
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| 60 | ; AL: Number of sectors to transfer (1...255)
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| 61 | ; SI: Offset to transfer function lookup table
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| 62 | ; DS:DI: Ptr to Disk Parameter Table
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| 63 | ; ES:BX: Ptr to source or destination data buffer
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| 64 | ; SS:BP: Ptr to PIOVARS
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| 65 | ; Returns:
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| 66 | ; ES:BX: Normalized pointer to data buffer
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| 67 | ; Corrupts registers:
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| 68 | ; AX, CX
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| 69 | ;--------------------------------------------------------------------
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| 70 | ALIGN JUMP_ALIGN
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| 71 | HPIO_InitializePIOVARS:
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| 72 | ; Store number of WORDs to transfer
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| 73 | mov ah, al ; Number of WORDs to transfer...
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| 74 | xor al, al ; ...to AX
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| 75 | mov [bp+PIOVARS.wWordsLeft], ax ; Store WORD count
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| 76 |
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| 77 | ; Store block size in WORDs
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| 78 | mov ah, [di+DPT.bSetBlock] ; AX = block size in WORDs
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| 79 | mov [bp+PIOVARS.wBlockSize], ax ; Store block size
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| 80 |
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| 81 | ; Get transfer function based on bus type
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| 82 | xchg ax, bx ; Backup BX
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| 83 | eMOVZX bx, BYTE [di+DPT.bIdeOff] ; CS:BX now points to IDEVARS
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| 84 | mov bl, BYTE [cs:bx+IDEVARS.bBusType] ; Load bus type to BX
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| 85 | mov bx, [cs:bx+si] ; Load offset to transfer function
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| 86 | mov [bp+PIOVARS.fnXfer], bx ; Store offset to transfer function
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| 87 | xchg bx, ax
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[116] | 88 | ; Fall to HPIO_NormalizeDataPointer
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[3] | 89 |
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| 90 | ;--------------------------------------------------------------------
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[116] | 91 | ; Normalizes far pointers so that offset overflows won't happen
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| 92 | ; when transferring data using PIO.
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[3] | 93 | ;
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[116] | 94 | ; HPIO_NormalizeDataPointer
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[3] | 95 | ; Parameters:
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| 96 | ; ES:BX: Ptr to source or destination data buffer
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| 97 | ; Returns:
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| 98 | ; ES:BX: Normalized pointer to data buffer
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| 99 | ; Corrupts registers:
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| 100 | ; AX, CX
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| 101 | ;--------------------------------------------------------------------
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| 102 | ;ALIGN JUMP_ALIGN
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| 103 | HPIO_NormalizeDataPointer:
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[116] | 104 | NORMALIZE_FAR_POINTER es, bx, ax, cx
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[3] | 105 | ret
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| 106 |
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| 107 |
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| 108 | ;--------------------------------------------------------------------
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| 109 | ; Reads blocks using PIO transfers.
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| 110 | ;
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| 111 | ; HPIO_ReadFromDrive
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| 112 | ; Parameters:
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| 113 | ; DX: IDE Data port address
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| 114 | ; DS:BX: Ptr to DPT (in RAMVARS segment)
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| 115 | ; ES:DI: Normalized ptr to buffer to recieve data
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| 116 | ; SS:BP: Ptr to PIOVARS
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| 117 | ; Returns:
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| 118 | ; AH: BIOS Error code
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| 119 | ; CF: 0 if transfer succesfull
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| 120 | ; 1 if any error
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| 121 | ; Corrupts registers:
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| 122 | ; AL, CX, DX, DI
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| 123 | ;--------------------------------------------------------------------
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| 124 | ALIGN JUMP_ALIGN
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| 125 | HPIO_ReadFromDrive:
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| 126 | cld ; INS to increment DI
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| 127 | ALIGN JUMP_ALIGN
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| 128 | .BlockLoop:
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| 129 | call HStatus_WaitIrqOrDrq ; Wait until ready to transfer
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[86] | 130 | jc SHORT HPIO_WriteToDrive.RetError ; Return if error (code in AH)
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[3] | 131 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size
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| 132 | sub [bp+PIOVARS.wWordsLeft], cx ; Transferring last (possibly partial) block?
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| 133 | jbe SHORT .XferLastBlock ; If so, jump to transfer
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| 134 | call [bp+PIOVARS.fnXfer] ; Transfer full block
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| 135 | jmp SHORT .BlockLoop ; Loop while blocks left
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| 136 | ALIGN JUMP_ALIGN
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| 137 | .XferLastBlock:
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| 138 | add cx, [bp+PIOVARS.wWordsLeft] ; CX to partial block size
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| 139 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 140 | jmp HStatus_WaitBsyDefTime ; Check for errors
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| 141 |
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| 142 |
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| 143 | ;--------------------------------------------------------------------
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| 144 | ; Writes sectors to hard disk using PIO transfer mode.
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| 145 | ;
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| 146 | ; HPIO_WriteBlock
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| 147 | ; Parameters:
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| 148 | ; AL: Number of sectors to write (1...255)
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| 149 | ; ES:BX: Pointer to buffer containing data
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| 150 | ; DS:DI: Ptr to Disk Parameter Table
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| 151 | ; Returns:
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| 152 | ; AH: BIOS Error code
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| 153 | ; CF: 0 if transfer successfull
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| 154 | ; 1 if any error
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| 155 | ; Corrupts registers:
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| 156 | ; AL, BX, CX, DX
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| 157 | ;--------------------------------------------------------------------
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| 158 | ALIGN JUMP_ALIGN
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| 159 | HPIO_WriteBlock:
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| 160 | push es
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| 161 | push si
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| 162 |
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| 163 | ; Create PIOVARS to stack
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| 164 | eENTER PIOVARS_size, 0
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[86] | 165 |
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[3] | 166 | mov si, g_rgfnPioWrite ; Offset to write function lookup
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| 167 | call HPIO_InitializePIOVARS ; Store word count and block size
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| 168 |
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| 169 | ; Prepare pointers and start transfer
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| 170 | mov si, bx ; ES:SI now points source buffer
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| 171 | mov bx, di ; DS:BX now points DPT
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| 172 | call HPIO_WriteToDrive
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| 173 |
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| 174 | ; Destroy stack frame
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| 175 | eLEAVE
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[86] | 176 |
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[3] | 177 | pop si
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| 178 | pop es
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| 179 | ret
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| 180 |
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[86] | 181 |
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[3] | 182 | ;--------------------------------------------------------------------
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| 183 | ; Writes blocks using PIO transfers.
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| 184 | ;
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| 185 | ; HPIO_WriteToDrive
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| 186 | ; Parameters:
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| 187 | ; DS:BX: Ptr to DPT (in RAMVARS segment)
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| 188 | ; ES:SI: Normalized ptr to buffer containing data
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| 189 | ; SS:BP: Ptr to PIOVARS
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| 190 | ; Returns:
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| 191 | ; AH: BIOS Error code
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| 192 | ; CF: 0 if transfer succesfull
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| 193 | ; 1 if any error
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| 194 | ; Corrupts registers:
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| 195 | ; AL, CX, DX, SI
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| 196 | ;--------------------------------------------------------------------
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| 197 | ALIGN JUMP_ALIGN
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| 198 | HPIO_WriteToDrive:
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| 199 | cld ; OUTS to increment SI
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[28] | 200 | call HStatus_WaitDrqDefTime ; Always poll DRQ for first block, get status reg to DX
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[3] | 201 | jc SHORT .RetError ; Return if error (code in AH)
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| 202 | sub dx, BYTE REGR_IDE_ST ; DX to Data Port address
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| 203 | ALIGN JUMP_ALIGN
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| 204 | .BlockLoop:
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| 205 | mov cx, [bp+PIOVARS.wBlockSize] ; Load block size
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| 206 | sub [bp+PIOVARS.wWordsLeft], cx ; Transferring last (possibly partial) block?
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| 207 | jbe SHORT .XferLastBlock ; If so, jump to transfer
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| 208 | call [bp+PIOVARS.fnXfer] ; Transfer full block
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| 209 | call HStatus_WaitIrqOrDrq ; Wait until ready to transfer
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| 210 | jnc SHORT .BlockLoop ; If no error, loop while blocks left
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| 211 | .RetError:
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[86] | 212 | ret ; This ret is shared with HPIO_ReadFromDrive
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[3] | 213 | ALIGN JUMP_ALIGN
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| 214 | .XferLastBlock:
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| 215 | add cx, [bp+PIOVARS.wWordsLeft] ; CX to partial block size
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| 216 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 217 | jmp HStatus_WaitIrqOrRdy ; Check for errors
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| 218 |
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[26] | 219 |
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[3] | 220 | ;--------------------------------------------------------------------
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| 221 | ; Bus specific transfer functions and lookup table.
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| 222 | ;
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| 223 | ; HPIO_DualByteRead Dual port 8-bit XTIDE PIO read transfer
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| 224 | ; HPIO_WordRead Normal 16-bit IDE PIO read transfer
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| 225 | ; HPIO_DualByteWrite Dual port 8-bit XTIDE PIO write transfer
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| 226 | ; HPIO_WordWrite Normal 16-bit IDE PIO write transfer
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| 227 | ; Parameters:
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| 228 | ; CX: Block size in WORDs
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| 229 | ; DX: IDE Data port address
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| 230 | ; ES:DI: Normalized ptr to buffer to recieve data (read only)
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| 231 | ; ES:SI: Normalized ptr to buffer containing data (write only)
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| 232 | ; Returns:
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| 233 | ; Nothing
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| 234 | ; Corrupts registers:
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| 235 | ; AX, CX
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| 236 | ;--------------------------------------------------------------------
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| 237 | ALIGN JUMP_ALIGN
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| 238 | HPIO_DualByteRead:
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| 239 | eREP_DUAL_BYTE_PORT_INSW
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| 240 | ret
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| 241 | ALIGN JUMP_ALIGN
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| 242 | HPIO_WordRead:
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| 243 | rep
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| 244 | db 6Dh ; INSW
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| 245 | ret
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| 246 | ALIGN JUMP_ALIGN
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| 247 | HPIO_DWordRead:
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| 248 | shr cx, 1 ; WORD count to DWORD count
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| 249 | rep
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| 250 | db 66h ; Override operand size to 32-bit
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| 251 | db 6Dh ; INSW/INSD
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| 252 | ret
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| 253 | ALIGN JUMP_ALIGN
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| 254 | HPIO_SingleByteRead:
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| 255 | eREP_SINGLE_BYTE_PORT_INSW
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| 256 | ret
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| 257 |
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| 258 | ALIGN JUMP_ALIGN
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| 259 | HPIO_DualByteWrite:
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| 260 | eREP_DUAL_BYTE_PORT_OUTSW
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| 261 | ret
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| 262 | ALIGN JUMP_ALIGN
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| 263 | HPIO_WordWrite:
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| 264 | eSEG es ; Source is ES segment
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| 265 | rep
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| 266 | db 6Fh ; OUTSW
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| 267 | ret
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| 268 | ALIGN JUMP_ALIGN
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| 269 | HPIO_DWordWrite:
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| 270 | shr cx, 1 ; WORD count to DWORD count
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| 271 | eSEG es ; Source is ES segment
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| 272 | rep
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| 273 | db 66h ; Override operand size to 32-bit
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| 274 | db 6Fh ; OUTSW/OUTSD
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| 275 | ret
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| 276 | ALIGN JUMP_ALIGN
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| 277 | HPIO_SingleByteWrite:
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| 278 | eREP_SINGLE_BYTE_PORT_OUTSW
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| 279 | ret
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| 280 |
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| 281 | ALIGN WORD_ALIGN
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| 282 | g_rgfnPioRead:
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| 283 | dw HPIO_DualByteRead ; 8-bit dual port reads
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| 284 | dw HPIO_WordRead ; 16-bit reads
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| 285 | dw HPIO_DWordRead ; 32-bit reads
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| 286 | dw HPIO_SingleByteRead ; 8-bit single port reads
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| 287 | g_rgfnPioWrite:
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| 288 | dw HPIO_DualByteWrite ; 8-bit dual port writes
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| 289 | dw HPIO_WordWrite ; 16-bit writes
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| 290 | dw HPIO_DWordWrite ; 32-bit writes
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| 291 | dw HPIO_SingleByteWrite ; 8-bit single port writes
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