[218] | 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for preparing data buffer for transfer.
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| 3 |
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[376] | 4 | ;
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[445] | 5 | ; XTIDE Universal BIOS and Associated Tools
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[376] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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[445] | 12 | ;
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[376] | 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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[445] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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[376] | 19 |
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[218] | 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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[221] | 23 | ;--------------------------------------------------------------------
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| 24 | ; Prepare_ByLoadingDapToESSIandVerifyingForTransfer
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| 25 | ; Parameters:
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| 26 | ; SI: Offset to DAP
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| 27 | ; DS:DI: Ptr to DPT
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| 28 | ; SS:BP: Ptr to IDEPACK
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| 29 | ; Parameters on INTPACK:
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| 30 | ; DS:SI: Ptr to Disk Address Packet
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| 31 | ; Returns:
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| 32 | ; BX: Index to command lookup table
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| 33 | ; ES:SI: Ptr to Disk Address Packet (DAP)
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| 34 | ; Exits from INT 13h if invalid DAP
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| 35 | ; Corrupts registers:
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| 36 | ; AX, DX
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| 37 | ;--------------------------------------------------------------------
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| 38 | %ifdef MODULE_EBIOS
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| 39 | ALIGN JUMP_ALIGN
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| 40 | Prepare_ByLoadingDapToESSIandVerifyingForTransfer:
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| 41 | ; Load pointer to DAP to ES:SI and make sure it is valid
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| 42 | mov es, [bp+IDEPACK.intpack+INTPACK.ds] ; ES:SI to point Disk Address Packet
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| 43 | cmp BYTE [es:si+DAP.bSize], MINIMUM_DAP_SIZE
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| 44 | jb SHORT InvalidDAP
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| 45 |
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| 46 | ; Make sure that sector count is valid
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| 47 | mov ax, [es:si+DAP.wSectorCount]
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| 48 | test ax, ax
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| 49 | jz SHORT ZeroSectorsRequestedSoNoErrors
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| 50 | cmp ax, BYTE 127
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| 51 | ja SHORT InvalidNumberOfSectorsRequested
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| 52 |
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[294] | 53 | ; Get EBIOS command index to BX
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[221] | 54 | ; LBA28 or LBA48 command
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| 55 | call Prepare_GetOldInt13hCommandIndexToBX
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[421] | 56 | mov al, [di+DPT.bFlagsLow]
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[445] | 57 | eSHL_IM al, 1 ; Set CF if LBA48 supported
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[421] | 58 | adc bl, bh ; LBA48 EXT commands
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[221] | 59 | ret
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[421] | 60 | %endif ; MODULE_EBIOS
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[221] | 61 |
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| 62 |
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| 63 | ;--------------------------------------------------------------------
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| 64 | ; Prepare_GetOldInt13hCommandIndexToBX
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| 65 | ; Parameters:
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| 66 | ; DS:DI: Ptr to DPT
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| 67 | ; Returns:
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| 68 | ; BX: Index to command lookup table
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| 69 | ; Corrupts registers:
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| 70 | ; Nothing
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| 71 | ;--------------------------------------------------------------------
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| 72 | ALIGN JUMP_ALIGN
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| 73 | Prepare_GetOldInt13hCommandIndexToBX:
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| 74 | ; Block mode or single sector
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| 75 | mov bl, [di+DPT.bFlagsHigh]
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| 76 | and bx, BYTE FLGH_DPT_BLOCK_MODE_SUPPORTED ; Bit 1
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| 77 | ret
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| 78 |
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| 79 |
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[218] | 80 | ;---------------------------------------------------------------------
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[221] | 81 | ; Prepare_BufferToESSIforOldInt13hTransfer
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[218] | 82 | ; Parameters:
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| 83 | ; AL: Number of sectors to transfer
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[474] | 84 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[218] | 85 | ; SS:BP: Ptr to IDEPACK
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| 86 | ; Parameters on INTPACK:
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| 87 | ; ES:BX: Ptr to data buffer
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| 88 | ; Returns:
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| 89 | ; ES:SI: Ptr to normalized data buffer
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| 90 | ; Exits INT 13h if error
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| 91 | ; Corrupts registers:
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| 92 | ; BX
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| 93 | ;--------------------------------------------------------------------
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| 94 | ALIGN JUMP_ALIGN
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[221] | 95 | Prepare_BufferToESSIforOldInt13hTransfer:
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[477] | 96 | mov si, [bp+IDEPACK.intpack+INTPACK.bx] ; Load offset
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[480] | 97 | mov es, [bp+IDEPACK.intpack+INTPACK.es] ; Load segment
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[221] | 98 | ; Fall to Prepare_ByValidatingSectorsInALforOldInt13h
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[218] | 99 |
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[221] | 100 | ;---------------------------------------------------------------------
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| 101 | ; Prepare_ByValidatingSectorsInALforOldInt13h
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| 102 | ; Parameters:
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| 103 | ; AL: Number of sectors to transfer
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| 104 | ; Returns:
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| 105 | ; Exits INT 13h if invalid number of sectors in AL
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| 106 | ; Corrupts registers:
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| 107 | ; Nothing
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| 108 | ;--------------------------------------------------------------------
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| 109 | Prepare_ByValidatingSectorsInALforOldInt13h:
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[218] | 110 | test al, al
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[221] | 111 | js SHORT .CheckZeroOffsetFor128Sectors ; 128 or more
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| 112 | jz SHORT InvalidNumberOfSectorsRequested ; Zero not allowed for old INT 13h
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[218] | 113 | ret ; Continue with transfer
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| 114 |
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| 115 | ALIGN JUMP_ALIGN
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| 116 | .CheckZeroOffsetFor128Sectors:
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| 117 | cmp al, 128
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[221] | 118 | ja SHORT InvalidNumberOfSectorsRequested
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[218] | 119 | test si, si ; Offset must be zero to xfer 128 sectors
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[221] | 120 | jnz SHORT CannotAlignPointerProperly
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[218] | 121 | ret ; Continue with transfer
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| 122 |
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[221] | 123 | InvalidDAP:
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| 124 | InvalidNumberOfSectorsRequested:
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| 125 | Prepare_ReturnFromInt13hWithInvalidFunctionError:
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[218] | 126 | mov ah, RET_HD_INVALID
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[322] | 127 | SKIP2B f
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| 128 | CannotAlignPointerProperly:
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| 129 | mov ah, RET_HD_BOUNDARY
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[221] | 130 | ZeroSectorsRequestedSoNoErrors:
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[218] | 131 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 132 |
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[221] | 133 |
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| 134 |
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| 135 | ; Command lookup tables
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| 136 | g_rgbReadCommandLookup:
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| 137 | db COMMAND_READ_SECTORS ; 00b, CHS or LBA28 single sector
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| 138 | db COMMAND_READ_SECTORS_EXT ; 01b, LBA48 single sector
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| 139 | db COMMAND_READ_MULTIPLE ; 10b, CHS or LBA28 block mode
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[413] | 140 | %ifdef MODULE_EBIOS
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[221] | 141 | db COMMAND_READ_MULTIPLE_EXT ; 11b, LBA48 block mode
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[413] | 142 | %endif
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[221] | 143 |
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| 144 | g_rgbWriteCommandLookup:
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| 145 | db COMMAND_WRITE_SECTORS
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| 146 | db COMMAND_WRITE_SECTORS_EXT
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| 147 | db COMMAND_WRITE_MULTIPLE
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[413] | 148 | %ifdef MODULE_EBIOS
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[221] | 149 | db COMMAND_WRITE_MULTIPLE_EXT
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[413] | 150 | %endif
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[221] | 151 |
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| 152 | g_rgbVerifyCommandLookup:
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| 153 | db COMMAND_VERIFY_SECTORS
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| 154 | db COMMAND_VERIFY_SECTORS_EXT
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| 155 | db COMMAND_VERIFY_SECTORS
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[413] | 156 | %ifdef MODULE_EBIOS
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[221] | 157 | db COMMAND_VERIFY_SECTORS_EXT
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[413] | 158 | %endif
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