[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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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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