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 overridden by the user library. 39 * 40 ****************************************************************************/ 41 42 #include <common.h> 43 #include "x86emu/x86emui.h" 44 45 /*------------------------- Global Variables ------------------------------*/ 46 47 X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ 48 X86EMU_intrFuncs _X86EMU_intrTab[256]; 49 50 int debug_intr; 51 52 /*----------------------------- Implementation ----------------------------*/ 53 54 /**************************************************************************** 55 PARAMETERS: 56 addr - Emulator memory address to read 57 58 RETURNS: 59 Byte value read from emulator memory. 60 61 REMARKS: 62 Reads a byte value from the emulator memory. 63 ****************************************************************************/ 64 u8 X86API rdb(u32 addr) 65 { 66 return 0; 67 } 68 69 /**************************************************************************** 70 PARAMETERS: 71 addr - Emulator memory address to read 72 73 RETURNS: 74 Word value read from emulator memory. 75 76 REMARKS: 77 Reads a word value from the emulator memory. 78 ****************************************************************************/ 79 u16 X86API rdw(u32 addr) 80 { 81 return 0; 82 } 83 84 /**************************************************************************** 85 PARAMETERS: 86 addr - Emulator memory address to read 87 88 RETURNS: 89 Long value read from emulator memory. 90 REMARKS: 91 Reads a long value from the emulator memory. 92 ****************************************************************************/ 93 u32 X86API rdl(u32 addr) 94 { 95 return 0; 96 } 97 98 /**************************************************************************** 99 PARAMETERS: 100 addr - Emulator memory address to read 101 val - Value to store 102 103 REMARKS: 104 Writes a byte value to emulator memory. 105 ****************************************************************************/ 106 void X86API wrb(u32 addr, u8 val) 107 { 108 } 109 110 /**************************************************************************** 111 PARAMETERS: 112 addr - Emulator memory address to read 113 val - Value to store 114 115 REMARKS: 116 Writes a word value to emulator memory. 117 ****************************************************************************/ 118 void X86API wrw(u32 addr, u16 val) 119 { 120 } 121 122 /**************************************************************************** 123 PARAMETERS: 124 addr - Emulator memory address to read 125 val - Value to store 126 127 REMARKS: 128 Writes a long value to emulator memory. 129 ****************************************************************************/ 130 void X86API wrl(u32 addr, u32 val) 131 { 132 } 133 134 /**************************************************************************** 135 PARAMETERS: 136 addr - PIO address to read 137 RETURN: 138 0 139 REMARKS: 140 Default PIO byte read function. Doesn't perform real inb. 141 ****************************************************************************/ 142 static u8 X86API p_inb(X86EMU_pioAddr addr) 143 { 144 DB(if (DEBUG_IO_TRACE()) 145 printk("inb %#04x \n", addr);) 146 return 0; 147 } 148 149 /**************************************************************************** 150 PARAMETERS: 151 addr - PIO address to read 152 RETURN: 153 0 154 REMARKS: 155 Default PIO word read function. Doesn't perform real inw. 156 ****************************************************************************/ 157 static u16 X86API p_inw(X86EMU_pioAddr addr) 158 { 159 DB(if (DEBUG_IO_TRACE()) 160 printk("inw %#04x \n", addr);) 161 return 0; 162 } 163 164 /**************************************************************************** 165 PARAMETERS: 166 addr - PIO address to read 167 RETURN: 168 0 169 REMARKS: 170 Default PIO long read function. Doesn't perform real inl. 171 ****************************************************************************/ 172 static u32 X86API p_inl(X86EMU_pioAddr addr) 173 { 174 DB(if (DEBUG_IO_TRACE()) 175 printk("inl %#04x \n", addr);) 176 return 0; 177 } 178 179 /**************************************************************************** 180 PARAMETERS: 181 addr - PIO address to write 182 val - Value to store 183 REMARKS: 184 Default PIO byte write function. Doesn't perform real outb. 185 ****************************************************************************/ 186 static void X86API p_outb(X86EMU_pioAddr addr, u8 val) 187 { 188 DB(if (DEBUG_IO_TRACE()) 189 printk("outb %#02x -> %#04x \n", val, addr);) 190 return; 191 } 192 193 /**************************************************************************** 194 PARAMETERS: 195 addr - PIO address to write 196 val - Value to store 197 REMARKS: 198 Default PIO word write function. Doesn't perform real outw. 199 ****************************************************************************/ 200 static void X86API p_outw(X86EMU_pioAddr addr, u16 val) 201 { 202 DB(if (DEBUG_IO_TRACE()) 203 printk("outw %#04x -> %#04x \n", val, addr);) 204 return; 205 } 206 207 /**************************************************************************** 208 PARAMETERS: 209 addr - PIO address to write 210 val - Value to store 211 REMARKS: 212 Default PIO ;ong write function. Doesn't perform real outl. 213 ****************************************************************************/ 214 static void X86API p_outl(X86EMU_pioAddr addr, u32 val) 215 { 216 DB(if (DEBUG_IO_TRACE()) 217 printk("outl %#08x -> %#04x \n", val, addr);) 218 return; 219 } 220 221 /*------------------------- Global Variables ------------------------------*/ 222 223 u8(X86APIP sys_rdb) (u32 addr) = rdb; 224 u16(X86APIP sys_rdw) (u32 addr) = rdw; 225 u32(X86APIP sys_rdl) (u32 addr) = rdl; 226 void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb; 227 void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw; 228 void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl; 229 u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb; 230 u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw; 231 u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl; 232 void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb; 233 void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw; 234 void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl; 235 236 /*----------------------------- Setup -------------------------------------*/ 237 238 /**************************************************************************** 239 PARAMETERS: 240 funcs - New memory function pointers to make active 241 242 REMARKS: 243 This function is used to set the pointers to functions which access 244 memory space, allowing the user application to override these functions 245 and hook them out as necessary for their application. 246 ****************************************************************************/ 247 void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs) 248 { 249 sys_rdb = funcs->rdb; 250 sys_rdw = funcs->rdw; 251 sys_rdl = funcs->rdl; 252 sys_wrb = funcs->wrb; 253 sys_wrw = funcs->wrw; 254 sys_wrl = funcs->wrl; 255 } 256 257 /**************************************************************************** 258 PARAMETERS: 259 funcs - New programmed I/O function pointers to make active 260 261 REMARKS: 262 This function is used to set the pointers to functions which access 263 I/O space, allowing the user application to override these functions 264 and hook them out as necessary for their application. 265 ****************************************************************************/ 266 void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs) 267 { 268 sys_inb = funcs->inb; 269 sys_inw = funcs->inw; 270 sys_inl = funcs->inl; 271 sys_outb = funcs->outb; 272 sys_outw = funcs->outw; 273 sys_outl = funcs->outl; 274 } 275 276 void X86EMU_setupIntrFunc(int intnum, X86EMU_intrFuncs func) 277 { 278 _X86EMU_intrTab[intnum] = func; 279 } 280 281 /**************************************************************************** 282 PARAMETERS: 283 funcs - New interrupt vector table to make active 284 285 REMARKS: 286 This function is used to set the pointers to functions which handle 287 interrupt processing in the emulator, allowing the user application to 288 hook interrupts as necessary for their application. Any interrupts that 289 are not hooked by the user application, and reflected and handled internally 290 in the emulator via the interrupt vector table. This allows the application 291 to get control when the code being emulated executes specific software 292 interrupts. 293 ****************************************************************************/ 294 void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[]) 295 { 296 int i; 297 298 for (i = 0; i < 256; i++) 299 _X86EMU_intrTab[i] = NULL; 300 if (funcs) { 301 for (i = 0; i < 256; i++) 302 _X86EMU_intrTab[i] = funcs[i]; 303 } 304 } 305 306 /**************************************************************************** 307 PARAMETERS: 308 int - New software interrupt to prepare for 309 310 REMARKS: 311 This function is used to set up the emulator state to exceute a software 312 interrupt. This can be used by the user application code to allow an 313 interrupt to be hooked, examined and then reflected back to the emulator 314 so that the code in the emulator will continue processing the software 315 interrupt as per normal. This essentially allows system code to actively 316 hook and handle certain software interrupts as necessary. 317 ****************************************************************************/ 318 void X86EMU_prepareForInt(int num) 319 { 320 push_word((u16) M.x86.R_FLG); 321 CLEAR_FLAG(F_IF); 322 CLEAR_FLAG(F_TF); 323 push_word(M.x86.R_CS); 324 M.x86.R_CS = mem_access_word(num * 4 + 2); 325 push_word(M.x86.R_IP); 326 M.x86.R_IP = mem_access_word(num * 4); 327 M.x86.intr = 0; 328 } 329
