| 1 | /* $NetBSD: x86emu_util.c,v 1.2 2007/12/04 17:32:22 joerg Exp $ */ |
| 2 | |
| 3 | /**************************************************************************** |
| 4 | * |
| 5 | * Realmode X86 Emulator Library |
| 6 | * |
| 7 | * Copyright (C) 1996-1999 SciTech Software, Inc. |
| 8 | * Copyright (C) David Mosberger-Tang |
| 9 | * Copyright (C) 1999 Egbert Eich |
| 10 | * Copyright (C) 2007 Joerg Sonnenberger |
| 11 | * |
| 12 | * ======================================================================== |
| 13 | * |
| 14 | * Permission to use, copy, modify, distribute, and sell this software and |
| 15 | * its documentation for any purpose is hereby granted without fee, |
| 16 | * provided that the above copyright notice appear in all copies and that |
| 17 | * both that copyright notice and this permission notice appear in |
| 18 | * supporting documentation, and that the name of the authors not be used |
| 19 | * in advertising or publicity pertaining to distribution of the software |
| 20 | * without specific, written prior permission. The authors makes no |
| 21 | * representations about the suitability of this software for any purpose. |
| 22 | * It is provided "as is" without express or implied warranty. |
| 23 | * |
| 24 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| 25 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| 26 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| 27 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
| 28 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
| 29 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 30 | * PERFORMANCE OF THIS SOFTWARE. |
| 31 | * |
| 32 | ****************************************************************************/ |
| 33 | |
| 34 | #include <x86emu/x86emu.h> |
| 35 | #include <x86emu/x86emu_regs.h> |
| 36 | |
| 37 | #include <sys/endian.h> |
| 38 | #include <sys/null.h> |
| 39 | |
| 40 | /**************************************************************************** |
| 41 | PARAMETERS: |
| 42 | addr - Emulator memory address to read |
| 43 | |
| 44 | RETURNS: |
| 45 | Byte value read from emulator memory. |
| 46 | |
| 47 | REMARKS: |
| 48 | Reads a byte value from the emulator memory. |
| 49 | ****************************************************************************/ |
| 50 | static uint8_t |
| 51 | rdb(struct X86EMU *emu, uint32_t addr) |
| 52 | { |
| 53 | if (addr > emu->mem_size - 1) |
| 54 | X86EMU_halt_sys(emu); |
| 55 | return emu->mem_base[addr]; |
| 56 | } |
| 57 | /**************************************************************************** |
| 58 | PARAMETERS: |
| 59 | addr - Emulator memory address to read |
| 60 | |
| 61 | RETURNS: |
| 62 | Word value read from emulator memory. |
| 63 | |
| 64 | REMARKS: |
| 65 | Reads a word value from the emulator memory. |
| 66 | ****************************************************************************/ |
| 67 | static uint16_t |
| 68 | rdw(struct X86EMU *emu, uint32_t addr) |
| 69 | { |
| 70 | if (addr > emu->mem_size - 2) |
| 71 | X86EMU_halt_sys(emu); |
| 72 | return le16dec(emu->mem_base + addr); |
| 73 | } |
| 74 | /**************************************************************************** |
| 75 | PARAMETERS: |
| 76 | addr - Emulator memory address to read |
| 77 | |
| 78 | RETURNS: |
| 79 | Long value read from emulator memory. |
| 80 | REMARKS: |
| 81 | Reads a long value from the emulator memory. |
| 82 | ****************************************************************************/ |
| 83 | static uint32_t |
| 84 | rdl(struct X86EMU *emu, uint32_t addr) |
| 85 | { |
| 86 | if (addr > emu->mem_size - 4) |
| 87 | X86EMU_halt_sys(emu); |
| 88 | return le32dec(emu->mem_base + addr); |
| 89 | } |
| 90 | /**************************************************************************** |
| 91 | PARAMETERS: |
| 92 | addr - Emulator memory address to read |
| 93 | val - Value to store |
| 94 | |
| 95 | REMARKS: |
| 96 | Writes a byte value to emulator memory. |
| 97 | ****************************************************************************/ |
| 98 | static void |
| 99 | wrb(struct X86EMU *emu, uint32_t addr, uint8_t val) |
| 100 | { |
| 101 | if (addr > emu->mem_size - 1) |
| 102 | X86EMU_halt_sys(emu); |
| 103 | emu->mem_base[addr] = val; |
| 104 | } |
| 105 | /**************************************************************************** |
| 106 | PARAMETERS: |
| 107 | addr - Emulator memory address to read |
| 108 | val - Value to store |
| 109 | |
| 110 | REMARKS: |
| 111 | Writes a word value to emulator memory. |
| 112 | ****************************************************************************/ |
| 113 | static void |
| 114 | wrw(struct X86EMU *emu, uint32_t addr, uint16_t val) |
| 115 | { |
| 116 | if (addr > emu->mem_size - 2) |
| 117 | X86EMU_halt_sys(emu); |
| 118 | le16enc(emu->mem_base + addr, val); |
| 119 | } |
| 120 | /**************************************************************************** |
| 121 | PARAMETERS: |
| 122 | addr - Emulator memory address to read |
| 123 | val - Value to store |
| 124 | |
| 125 | REMARKS: |
| 126 | Writes a long value to emulator memory. |
| 127 | ****************************************************************************/ |
| 128 | static void |
| 129 | wrl(struct X86EMU *emu, uint32_t addr, uint32_t val) |
| 130 | { |
| 131 | if (addr > emu->mem_size - 4) |
| 132 | X86EMU_halt_sys(emu); |
| 133 | le32enc(emu->mem_base + addr, val); |
| 134 | } |
| 135 | |
| 136 | /*----------------------------- Setup -------------------------------------*/ |
| 137 | |
| 138 | void |
| 139 | X86EMU_init_default(struct X86EMU *emu) |
| 140 | { |
| 141 | int i; |
| 142 | |
| 143 | emu->emu_rdb = rdb; |
| 144 | emu->emu_rdw = rdw; |
| 145 | emu->emu_rdl = rdl; |
| 146 | emu->emu_wrb = wrb; |
| 147 | emu->emu_wrw = wrw; |
| 148 | emu->emu_wrl = wrl; |
| 149 | |
| 150 | for (i = 0; i < 256; i++) |
| 151 | emu->_X86EMU_intrTab[i] = NULL; |
| 152 | } |
| 153 | |