1 /**************************************************************************** 2 * 3 * Realmode X86 Emulator Library 4 * 5 * Copyright (C) 1991-2004 SciTech Software, Inc. 6 * Copyright (C) David Mosberger-Tang 7 * Copyright (C) 1999 Egbert Eich 8 * 9 * ======================================================================== 10 * 11 * Permission to use, copy, modify, distribute, and sell this software and 12 * its documentation for any purpose is hereby granted without fee, 13 * provided that the above copyright notice appear in all copies and that 14 * both that copyright notice and this permission notice appear in 15 * supporting documentation, and that the name of the authors not be used 16 * in advertising or publicity pertaining to distribution of the software 17 * without specific, written prior permission. The authors makes no 18 * representations about the suitability of this software for any purpose. 19 * It is provided "as is" without express or implied warranty. 20 * 21 * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 22 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO 23 * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR 24 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF 25 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 26 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 27 * PERFORMANCE OF THIS SOFTWARE. 28 * 29 * ======================================================================== 30 * 31 * Language: ANSI C 32 * Environment: Any 33 * Developer: Kendall Bennett 34 * 35 * Description: This file includes subroutines which are related to 36 * programmed I/O and memory access. Included in this module 37 * are default functions that do nothing. For real uses these 38 * functions will have to be overriden by the user library. 39 * 40 ****************************************************************************/ 41 42 #include "x86emu/x86emui.h" 43 44 #if defined(CONFIG_BIOSEMU) 45 46 /*------------------------- Global Variables ------------------------------*/ 47 48 X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ 49 X86EMU_intrFuncs _X86EMU_intrTab[256]; 50 51 int debug_intr; 52 53 /*----------------------------- Implementation ----------------------------*/ 54 55 /**************************************************************************** 56 PARAMETERS: 57 addr - Emulator memory address to read 58 59 RETURNS: 60 Byte value read from emulator memory. 61 62 REMARKS: 63 Reads a byte value from the emulator memory. 64 ****************************************************************************/ 65 u8 X86API rdb(u32 addr) 66 { 67 return 0; 68 } 69 70 /**************************************************************************** 71 PARAMETERS: 72 addr - Emulator memory address to read 73 74 RETURNS: 75 Word value read from emulator memory. 76 77 REMARKS: 78 Reads a word value from the emulator memory. 79 ****************************************************************************/ 80 u16 X86API rdw(u32 addr) 81 { 82 return 0; 83 } 84 85 /**************************************************************************** 86 PARAMETERS: 87 addr - Emulator memory address to read 88 89 RETURNS: 90 Long value read from emulator memory. 91 REMARKS: 92 Reads a long value from the emulator memory. 93 ****************************************************************************/ 94 u32 X86API rdl(u32 addr) 95 { 96 return 0; 97 } 98 99 /**************************************************************************** 100 PARAMETERS: 101 addr - Emulator memory address to read 102 val - Value to store 103 104 REMARKS: 105 Writes a byte value to emulator memory. 106 ****************************************************************************/ 107 void X86API wrb(u32 addr, u8 val) 108 { 109 } 110 111 /**************************************************************************** 112 PARAMETERS: 113 addr - Emulator memory address to read 114 val - Value to store 115 116 REMARKS: 117 Writes a word value to emulator memory. 118 ****************************************************************************/ 119 void X86API wrw(u32 addr, u16 val) 120 { 121 } 122 123 /**************************************************************************** 124 PARAMETERS: 125 addr - Emulator memory address to read 126 val - Value to store 127 128 REMARKS: 129 Writes a long value to emulator memory. 130 ****************************************************************************/ 131 void X86API wrl(u32 addr, u32 val) 132 { 133 } 134 135 /**************************************************************************** 136 PARAMETERS: 137 addr - PIO address to read 138 RETURN: 139 0 140 REMARKS: 141 Default PIO byte read function. Doesn't perform real inb. 142 ****************************************************************************/ 143 static u8 X86API p_inb(X86EMU_pioAddr addr) 144 { 145 DB(if (DEBUG_IO_TRACE()) 146 printk("inb %#04x \n", addr);) 147 return 0; 148 } 149 150 /**************************************************************************** 151 PARAMETERS: 152 addr - PIO address to read 153 RETURN: 154 0 155 REMARKS: 156 Default PIO word read function. Doesn't perform real inw. 157 ****************************************************************************/ 158 static u16 X86API p_inw(X86EMU_pioAddr addr) 159 { 160 DB(if (DEBUG_IO_TRACE()) 161 printk("inw %#04x \n", addr);) 162 return 0; 163 } 164 165 /**************************************************************************** 166 PARAMETERS: 167 addr - PIO address to read 168 RETURN: 169 0 170 REMARKS: 171 Default PIO long read function. Doesn't perform real inl. 172 ****************************************************************************/ 173 static u32 X86API p_inl(X86EMU_pioAddr addr) 174 { 175 DB(if (DEBUG_IO_TRACE()) 176 printk("inl %#04x \n", addr);) 177 return 0; 178 } 179 180 /**************************************************************************** 181 PARAMETERS: 182 addr - PIO address to write 183 val - Value to store 184 REMARKS: 185 Default PIO byte write function. Doesn't perform real outb. 186 ****************************************************************************/ 187 static void X86API p_outb(X86EMU_pioAddr addr, u8 val) 188 { 189 DB(if (DEBUG_IO_TRACE()) 190 printk("outb %#02x -> %#04x \n", val, addr);) 191 return; 192 } 193 194 /**************************************************************************** 195 PARAMETERS: 196 addr - PIO address to write 197 val - Value to store 198 REMARKS: 199 Default PIO word write function. Doesn't perform real outw. 200 ****************************************************************************/ 201 static void X86API p_outw(X86EMU_pioAddr addr, u16 val) 202 { 203 DB(if (DEBUG_IO_TRACE()) 204 printk("outw %#04x -> %#04x \n", val, addr);) 205 return; 206 } 207 208 /**************************************************************************** 209 PARAMETERS: 210 addr - PIO address to write 211 val - Value to store 212 REMARKS: 213 Default PIO ;ong write function. Doesn't perform real outl. 214 ****************************************************************************/ 215 static void X86API p_outl(X86EMU_pioAddr addr, u32 val) 216 { 217 DB(if (DEBUG_IO_TRACE()) 218 printk("outl %#08x -> %#04x \n", val, addr);) 219 return; 220 } 221 222 /*------------------------- Global Variables ------------------------------*/ 223 224 u8(X86APIP sys_rdb) (u32 addr) = rdb; 225 u16(X86APIP sys_rdw) (u32 addr) = rdw; 226 u32(X86APIP sys_rdl) (u32 addr) = rdl; 227 void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb; 228 void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw; 229 void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl; 230 u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb; 231 u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw; 232 u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl; 233 void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb; 234 void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw; 235 void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl; 236 237 /*----------------------------- Setup -------------------------------------*/ 238 239 /**************************************************************************** 240 PARAMETERS: 241 funcs - New memory function pointers to make active 242 243 REMARKS: 244 This function is used to set the pointers to functions which access 245 memory space, allowing the user application to override these functions 246 and hook them out as necessary for their application. 247 ****************************************************************************/ 248 void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs) 249 { 250 sys_rdb = funcs->rdb; 251 sys_rdw = funcs->rdw; 252 sys_rdl = funcs->rdl; 253 sys_wrb = funcs->wrb; 254 sys_wrw = funcs->wrw; 255 sys_wrl = funcs->wrl; 256 } 257 258 /**************************************************************************** 259 PARAMETERS: 260 funcs - New programmed I/O function pointers to make active 261 262 REMARKS: 263 This function is used to set the pointers to functions which access 264 I/O space, allowing the user application to override these functions 265 and hook them out as necessary for their application. 266 ****************************************************************************/ 267 void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs) 268 { 269 sys_inb = funcs->inb; 270 sys_inw = funcs->inw; 271 sys_inl = funcs->inl; 272 sys_outb = funcs->outb; 273 sys_outw = funcs->outw; 274 sys_outl = funcs->outl; 275 } 276 277 /**************************************************************************** 278 PARAMETERS: 279 funcs - New interrupt vector table to make active 280 281 REMARKS: 282 This function is used to set the pointers to functions which handle 283 interrupt processing in the emulator, allowing the user application to 284 hook interrupts as necessary for their application. Any interrupts that 285 are not hooked by the user application, and reflected and handled internally 286 in the emulator via the interrupt vector table. This allows the application 287 to get control when the code being emulated executes specific software 288 interrupts. 289 ****************************************************************************/ 290 void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[]) 291 { 292 int i; 293 294 for (i = 0; i < 256; i++) 295 _X86EMU_intrTab[i] = NULL; 296 if (funcs) { 297 for (i = 0; i < 256; i++) 298 _X86EMU_intrTab[i] = funcs[i]; 299 } 300 } 301 302 /**************************************************************************** 303 PARAMETERS: 304 int - New software interrupt to prepare for 305 306 REMARKS: 307 This function is used to set up the emulator state to exceute a software 308 interrupt. This can be used by the user application code to allow an 309 interrupt to be hooked, examined and then reflected back to the emulator 310 so that the code in the emulator will continue processing the software 311 interrupt as per normal. This essentially allows system code to actively 312 hook and handle certain software interrupts as necessary. 313 ****************************************************************************/ 314 void X86EMU_prepareForInt(int num) 315 { 316 push_word((u16) M.x86.R_FLG); 317 CLEAR_FLAG(F_IF); 318 CLEAR_FLAG(F_TF); 319 push_word(M.x86.R_CS); 320 M.x86.R_CS = mem_access_word(num * 4 + 2); 321 push_word(M.x86.R_IP); 322 M.x86.R_IP = mem_access_word(num * 4); 323 M.x86.intr = 0; 324 } 325 326 #endif 327