[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for memory access. |
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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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[445] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[445] | 18 | ; |
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[376] | 19 | |
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[41] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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[46] | 24 | ; OPTIMIZE_STRING_OPERATION |
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[41] | 25 | ; Parameters |
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[592] | 26 | ; %1: String instruction without size (only MOVS and STOS is supported) |
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[46] | 27 | ; CX: Number of BYTEs to operate |
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[592] | 28 | ; DS:SI: Ptr to source data (for MOVS) |
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[46] | 29 | ; ES:DI: Ptr to destination |
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[41] | 30 | ; Returns: |
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[592] | 31 | ; CF: Cleared |
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| 32 | ; CX: Zero |
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[46] | 33 | ; SI, DI: Updated by number of bytes operated |
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| 34 | ; Corrupts registers: |
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[41] | 35 | ; Nothing |
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[46] | 36 | ;-------------------------------------------------------------------- |
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[592] | 37 | %macro OPTIMIZE_STRING_OPERATION 1 |
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| 38 | shr cx, 1 |
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| 39 | rep %1w |
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| 40 | eRCL_IM cx, 1 |
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| 41 | rep %1b |
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[46] | 42 | %endmacro |
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| 43 | |
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| 44 | |
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| 45 | ;-------------------------------------------------------------------- |
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| 46 | ; Memory_CopyCXbytesFromDSSItoESDI |
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| 47 | ; Parameters |
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| 48 | ; CX: Number of bytes to copy |
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| 49 | ; DS:SI: Ptr to source data |
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| 50 | ; ES:DI: Ptr to destination buffer |
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| 51 | ; Returns: |
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[592] | 52 | ; CF: Cleared |
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[46] | 53 | ; SI, DI: Updated by number of bytes copied |
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[41] | 54 | ; Corrupts registers: |
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[46] | 55 | ; Nothing |
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[41] | 56 | ;-------------------------------------------------------------------- |
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[592] | 57 | %ifndef EXCLUDE_FROM_XUB |
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[41] | 58 | ALIGN JUMP_ALIGN |
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[46] | 59 | Memory_CopyCXbytesFromDSSItoESDI: |
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[592] | 60 | push cx |
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| 61 | OPTIMIZE_STRING_OPERATION movs |
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| 62 | pop cx |
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[46] | 63 | ret |
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[131] | 64 | %endif |
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[41] | 65 | |
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[46] | 66 | |
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[41] | 67 | ;-------------------------------------------------------------------- |
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[46] | 68 | ; Memory_ZeroSSBPwithSizeInCX |
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[41] | 69 | ; Parameters |
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[46] | 70 | ; CX: Number of bytes to zero |
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[41] | 71 | ; SS:BP: Ptr to buffer to zero |
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| 72 | ; Returns: |
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| 73 | ; Nothing |
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| 74 | ; Corrupts registers: |
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[592] | 75 | ; CX |
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[41] | 76 | ;-------------------------------------------------------------------- |
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[489] | 77 | %ifdef INCLUDE_MENU_LIBRARY |
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[41] | 78 | ALIGN JUMP_ALIGN |
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[46] | 79 | Memory_ZeroSSBPwithSizeInCX: |
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[50] | 80 | push es |
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| 81 | push di |
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[41] | 82 | push ax |
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[105] | 83 | call Registers_CopySSBPtoESDI |
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[46] | 84 | call Memory_ZeroESDIwithSizeInCX |
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[41] | 85 | pop ax |
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[50] | 86 | pop di |
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| 87 | pop es |
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[41] | 88 | ret |
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[489] | 89 | %endif |
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[41] | 90 | |
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[526] | 91 | |
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[41] | 92 | ;-------------------------------------------------------------------- |
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[46] | 93 | ; Memory_ZeroESDIwithSizeInCX |
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[41] | 94 | ; Parameters |
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[46] | 95 | ; CX: Number of bytes to zero |
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| 96 | ; ES:DI: Ptr to destination buffer |
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[41] | 97 | ; Returns: |
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[50] | 98 | ; DI: Updated by number of BYTEs stored |
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[41] | 99 | ; Corrupts registers: |
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[592] | 100 | ; AX, CX |
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[41] | 101 | ;-------------------------------------------------------------------- |
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| 102 | ALIGN JUMP_ALIGN |
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[46] | 103 | Memory_ZeroESDIwithSizeInCX: |
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[41] | 104 | xor ax, ax |
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[46] | 105 | ; Fall to Memory_StoreCXbytesFromAccumToESDI |
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[41] | 106 | |
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| 107 | ;-------------------------------------------------------------------- |
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[46] | 108 | ; Memory_StoreCXbytesFromAccumToESDI |
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[41] | 109 | ; Parameters |
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| 110 | ; AX: Word to use to fill buffer |
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[46] | 111 | ; CX: Number of BYTEs to store |
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| 112 | ; ES:DI: Ptr to destination buffer |
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[41] | 113 | ; Returns: |
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[50] | 114 | ; DI: Updated by number of BYTEs stored |
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[41] | 115 | ; Corrupts registers: |
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[592] | 116 | ; CX |
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[41] | 117 | ;-------------------------------------------------------------------- |
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[46] | 118 | Memory_StoreCXbytesFromAccumToESDI: |
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[592] | 119 | OPTIMIZE_STRING_OPERATION stos |
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[41] | 120 | ret |
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| 121 | |
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| 122 | |
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| 123 | ;-------------------------------------------------------------------- |
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| 124 | ; Memory_ReserveCXbytesFromStackToDSSI |
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| 125 | ; Parameters |
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| 126 | ; CX: Number of bytes to reserve |
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| 127 | ; Returns: |
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| 128 | ; DS:SI: Ptr to reserved buffer |
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| 129 | ; Corrupts registers: |
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| 130 | ; AX |
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| 131 | ;-------------------------------------------------------------------- |
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[592] | 132 | %ifndef EXCLUDE_FROM_XUB |
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[41] | 133 | ALIGN JUMP_ALIGN |
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| 134 | Memory_ReserveCXbytesFromStackToDSSI: |
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| 135 | pop ax |
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| 136 | push ss |
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| 137 | pop ds |
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| 138 | sub sp, cx |
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| 139 | mov si, sp |
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| 140 | jmp ax |
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[194] | 141 | %endif |
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[440] | 142 | |
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| 143 | |
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| 144 | ;-------------------------------------------------------------------- |
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| 145 | ; Memory_SumCXbytesFromESSItoAL |
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| 146 | ; Parameters |
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| 147 | ; CX: Number of bytes to sum (0=65536) |
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| 148 | ; ES:SI: Ptr to buffer containing the bytes to sum |
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| 149 | ; Returns: |
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| 150 | ; AL: Sum of bytes |
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[445] | 151 | ; ZF: Set if result is zero |
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| 152 | ; Cleared if result is non-zero |
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[440] | 153 | ; Corrupts registers: |
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| 154 | ; CX |
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| 155 | ;-------------------------------------------------------------------- |
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[580] | 156 | %ifndef EXCLUDE_FROM_XTIDECFG OR NO_ATAID_VALIDATION |
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[440] | 157 | ALIGN JUMP_ALIGN |
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| 158 | Memory_SumCXbytesFromESSItoAL: |
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| 159 | push si |
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[445] | 160 | dec si |
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[440] | 161 | xor al, al |
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| 162 | ALIGN JUMP_ALIGN |
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| 163 | .AddNextByteToAL: |
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[445] | 164 | inc si |
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[440] | 165 | add al, [es:si] |
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| 166 | loop .AddNextByteToAL |
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| 167 | pop si |
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| 168 | ret |
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[445] | 169 | %endif |
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