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 <common.h> 43 44 #if defined(CONFIG_BIOSEMU) 45 46 #include "x86emu/x86emui.h" 47 48 /*------------------------- Global Variables ------------------------------*/ 49 50 X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ 51 X86EMU_intrFuncs _X86EMU_intrTab[256]; 52 53 int debug_intr; 54 55 /*----------------------------- Implementation ----------------------------*/ 56 57 /**************************************************************************** 58 PARAMETERS: 59 addr - Emulator memory address to read 60 61 RETURNS: 62 Byte value read from emulator memory. 63 64 REMARKS: 65 Reads a byte value from the emulator memory. 66 ****************************************************************************/ 67 u8 X86API rdb(u32 addr) 68 { 69 return 0; 70 } 71 72 /**************************************************************************** 73 PARAMETERS: 74 addr - Emulator memory address to read 75 76 RETURNS: 77 Word value read from emulator memory. 78 79 REMARKS: 80 Reads a word value from the emulator memory. 81 ****************************************************************************/ 82 u16 X86API rdw(u32 addr) 83 { 84 return 0; 85 } 86 87 /**************************************************************************** 88 PARAMETERS: 89 addr - Emulator memory address to read 90 91 RETURNS: 92 Long value read from emulator memory. 93 REMARKS: 94 Reads a long value from the emulator memory. 95 ****************************************************************************/ 96 u32 X86API rdl(u32 addr) 97 { 98 return 0; 99 } 100 101 /**************************************************************************** 102 PARAMETERS: 103 addr - Emulator memory address to read 104 val - Value to store 105 106 REMARKS: 107 Writes a byte value to emulator memory. 108 ****************************************************************************/ 109 void X86API wrb(u32 addr, u8 val) 110 { 111 } 112 113 /**************************************************************************** 114 PARAMETERS: 115 addr - Emulator memory address to read 116 val - Value to store 117 118 REMARKS: 119 Writes a word value to emulator memory. 120 ****************************************************************************/ 121 void X86API wrw(u32 addr, u16 val) 122 { 123 } 124 125 /**************************************************************************** 126 PARAMETERS: 127 addr - Emulator memory address to read 128 val - Value to store 129 130 REMARKS: 131 Writes a long value to emulator memory. 132 ****************************************************************************/ 133 void X86API wrl(u32 addr, u32 val) 134 { 135 } 136 137 /**************************************************************************** 138 PARAMETERS: 139 addr - PIO address to read 140 RETURN: 141 0 142 REMARKS: 143 Default PIO byte read function. Doesn't perform real inb. 144 ****************************************************************************/ 145 static u8 X86API p_inb(X86EMU_pioAddr addr) 146 { 147 DB(if (DEBUG_IO_TRACE()) 148 printk("inb %#04x \n", addr);) 149 return 0; 150 } 151 152 /**************************************************************************** 153 PARAMETERS: 154 addr - PIO address to read 155 RETURN: 156 0 157 REMARKS: 158 Default PIO word read function. Doesn't perform real inw. 159 ****************************************************************************/ 160 static u16 X86API p_inw(X86EMU_pioAddr addr) 161 { 162 DB(if (DEBUG_IO_TRACE()) 163 printk("inw %#04x \n", addr);) 164 return 0; 165 } 166 167 /**************************************************************************** 168 PARAMETERS: 169 addr - PIO address to read 170 RETURN: 171 0 172 REMARKS: 173 Default PIO long read function. Doesn't perform real inl. 174 ****************************************************************************/ 175 static u32 X86API p_inl(X86EMU_pioAddr addr) 176 { 177 DB(if (DEBUG_IO_TRACE()) 178 printk("inl %#04x \n", addr);) 179 return 0; 180 } 181 182 /**************************************************************************** 183 PARAMETERS: 184 addr - PIO address to write 185 val - Value to store 186 REMARKS: 187 Default PIO byte write function. Doesn't perform real outb. 188 ****************************************************************************/ 189 static void X86API p_outb(X86EMU_pioAddr addr, u8 val) 190 { 191 DB(if (DEBUG_IO_TRACE()) 192 printk("outb %#02x -> %#04x \n", val, addr);) 193 return; 194 } 195 196 /**************************************************************************** 197 PARAMETERS: 198 addr - PIO address to write 199 val - Value to store 200 REMARKS: 201 Default PIO word write function. Doesn't perform real outw. 202 ****************************************************************************/ 203 static void X86API p_outw(X86EMU_pioAddr addr, u16 val) 204 { 205 DB(if (DEBUG_IO_TRACE()) 206 printk("outw %#04x -> %#04x \n", val, addr);) 207 return; 208 } 209 210 /**************************************************************************** 211 PARAMETERS: 212 addr - PIO address to write 213 val - Value to store 214 REMARKS: 215 Default PIO ;ong write function. Doesn't perform real outl. 216 ****************************************************************************/ 217 static void X86API p_outl(X86EMU_pioAddr addr, u32 val) 218 { 219 DB(if (DEBUG_IO_TRACE()) 220 printk("outl %#08x -> %#04x \n", val, addr);) 221 return; 222 } 223 224 /*------------------------- Global Variables ------------------------------*/ 225 226 u8(X86APIP sys_rdb) (u32 addr) = rdb; 227 u16(X86APIP sys_rdw) (u32 addr) = rdw; 228 u32(X86APIP sys_rdl) (u32 addr) = rdl; 229 void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb; 230 void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw; 231 void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl; 232 u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb; 233 u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw; 234 u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl; 235 void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb; 236 void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw; 237 void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl; 238 239 /*----------------------------- Setup -------------------------------------*/ 240 241 /**************************************************************************** 242 PARAMETERS: 243 funcs - New memory function pointers to make active 244 245 REMARKS: 246 This function is used to set the pointers to functions which access 247 memory space, allowing the user application to override these functions 248 and hook them out as necessary for their application. 249 ****************************************************************************/ 250 void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs) 251 { 252 sys_rdb = funcs->rdb; 253 sys_rdw = funcs->rdw; 254 sys_rdl = funcs->rdl; 255 sys_wrb = funcs->wrb; 256 sys_wrw = funcs->wrw; 257 sys_wrl = funcs->wrl; 258 } 259 260 /**************************************************************************** 261 PARAMETERS: 262 funcs - New programmed I/O function pointers to make active 263 264 REMARKS: 265 This function is used to set the pointers to functions which access 266 I/O space, allowing the user application to override these functions 267 and hook them out as necessary for their application. 268 ****************************************************************************/ 269 void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs) 270 { 271 sys_inb = funcs->inb; 272 sys_inw = funcs->inw; 273 sys_inl = funcs->inl; 274 sys_outb = funcs->outb; 275 sys_outw = funcs->outw; 276 sys_outl = funcs->outl; 277 } 278 279 /**************************************************************************** 280 PARAMETERS: 281 funcs - New interrupt vector table to make active 282 283 REMARKS: 284 This function is used to set the pointers to functions which handle 285 interrupt processing in the emulator, allowing the user application to 286 hook interrupts as necessary for their application. Any interrupts that 287 are not hooked by the user application, and reflected and handled internally 288 in the emulator via the interrupt vector table. This allows the application 289 to get control when the code being emulated executes specific software 290 interrupts. 291 ****************************************************************************/ 292 void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[]) 293 { 294 int i; 295 296 for (i = 0; i < 256; i++) 297 _X86EMU_intrTab[i] = NULL; 298 if (funcs) { 299 for (i = 0; i < 256; i++) 300 _X86EMU_intrTab[i] = funcs[i]; 301 } 302 } 303 304 /**************************************************************************** 305 PARAMETERS: 306 int - New software interrupt to prepare for 307 308 REMARKS: 309 This function is used to set up the emulator state to exceute a software 310 interrupt. This can be used by the user application code to allow an 311 interrupt to be hooked, examined and then reflected back to the emulator 312 so that the code in the emulator will continue processing the software 313 interrupt as per normal. This essentially allows system code to actively 314 hook and handle certain software interrupts as necessary. 315 ****************************************************************************/ 316 void X86EMU_prepareForInt(int num) 317 { 318 push_word((u16) M.x86.R_FLG); 319 CLEAR_FLAG(F_IF); 320 CLEAR_FLAG(F_TF); 321 push_word(M.x86.R_CS); 322 M.x86.R_CS = mem_access_word(num * 4 + 2); 323 push_word(M.x86.R_IP); 324 M.x86.R_IP = mem_access_word(num * 4); 325 M.x86.intr = 0; 326 } 327 328 #endif 329