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 <linux/printk.h> 44#include "x86emu/x86emui.h" 45 46/*------------------------- Global Variables ------------------------------*/ 47 48/* Note: bios.c defines this if the emulator is not enabled */ 49X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ 50X86EMU_intrFuncs _X86EMU_intrTab[256]; 51 52int debug_intr; 53 54/*----------------------------- Implementation ----------------------------*/ 55 56/**************************************************************************** 57PARAMETERS: 58addr - Emulator memory address to read 59 60RETURNS: 61Byte value read from emulator memory. 62 63REMARKS: 64Reads a byte value from the emulator memory. 65****************************************************************************/ 66u8 X86API rdb(u32 addr) 67{ 68 return 0; 69} 70 71/**************************************************************************** 72PARAMETERS: 73addr - Emulator memory address to read 74 75RETURNS: 76Word value read from emulator memory. 77 78REMARKS: 79Reads a word value from the emulator memory. 80****************************************************************************/ 81u16 X86API rdw(u32 addr) 82{ 83 return 0; 84} 85 86/**************************************************************************** 87PARAMETERS: 88addr - Emulator memory address to read 89 90RETURNS: 91Long value read from emulator memory. 92REMARKS: 93Reads a long value from the emulator memory. 94****************************************************************************/ 95u32 X86API rdl(u32 addr) 96{ 97 return 0; 98} 99 100/**************************************************************************** 101PARAMETERS: 102addr - Emulator memory address to read 103val - Value to store 104 105REMARKS: 106Writes a byte value to emulator memory. 107****************************************************************************/ 108void X86API wrb(u32 addr, u8 val) 109{ 110} 111 112/**************************************************************************** 113PARAMETERS: 114addr - Emulator memory address to read 115val - Value to store 116 117REMARKS: 118Writes a word value to emulator memory. 119****************************************************************************/ 120void X86API wrw(u32 addr, u16 val) 121{ 122} 123 124/**************************************************************************** 125PARAMETERS: 126addr - Emulator memory address to read 127val - Value to store 128 129REMARKS: 130Writes a long value to emulator memory. 131****************************************************************************/ 132void X86API wrl(u32 addr, u32 val) 133{ 134} 135 136/**************************************************************************** 137PARAMETERS: 138addr - PIO address to read 139RETURN: 1400 141REMARKS: 142Default PIO byte read function. Doesn't perform real inb. 143****************************************************************************/ 144static u8 X86API p_inb(X86EMU_pioAddr addr) 145{ 146 DB(if (DEBUG_IO_TRACE()) 147 printk("inb %#04x \n", addr);) 148 return 0; 149} 150 151/**************************************************************************** 152PARAMETERS: 153addr - PIO address to read 154RETURN: 1550 156REMARKS: 157Default PIO word read function. Doesn't perform real inw. 158****************************************************************************/ 159static u16 X86API p_inw(X86EMU_pioAddr addr) 160{ 161 DB(if (DEBUG_IO_TRACE()) 162 printk("inw %#04x \n", addr);) 163 return 0; 164} 165 166/**************************************************************************** 167PARAMETERS: 168addr - PIO address to read 169RETURN: 1700 171REMARKS: 172Default PIO long read function. Doesn't perform real inl. 173****************************************************************************/ 174static u32 X86API p_inl(X86EMU_pioAddr addr) 175{ 176 DB(if (DEBUG_IO_TRACE()) 177 printk("inl %#04x \n", addr);) 178 return 0; 179} 180 181/**************************************************************************** 182PARAMETERS: 183addr - PIO address to write 184val - Value to store 185REMARKS: 186Default PIO byte write function. Doesn't perform real outb. 187****************************************************************************/ 188static void X86API p_outb(X86EMU_pioAddr addr, u8 val) 189{ 190 DB(if (DEBUG_IO_TRACE()) 191 printk("outb %#02x -> %#04x \n", val, addr);) 192 return; 193} 194 195/**************************************************************************** 196PARAMETERS: 197addr - PIO address to write 198val - Value to store 199REMARKS: 200Default PIO word write function. Doesn't perform real outw. 201****************************************************************************/ 202static void X86API p_outw(X86EMU_pioAddr addr, u16 val) 203{ 204 DB(if (DEBUG_IO_TRACE()) 205 printk("outw %#04x -> %#04x \n", val, addr);) 206 return; 207} 208 209/**************************************************************************** 210PARAMETERS: 211addr - PIO address to write 212val - Value to store 213REMARKS: 214Default PIO ;ong write function. Doesn't perform real outl. 215****************************************************************************/ 216static void X86API p_outl(X86EMU_pioAddr addr, u32 val) 217{ 218 DB(if (DEBUG_IO_TRACE()) 219 printk("outl %#08x -> %#04x \n", val, addr);) 220 return; 221} 222 223/*------------------------- Global Variables ------------------------------*/ 224 225u8(X86APIP sys_rdb) (u32 addr) = rdb; 226u16(X86APIP sys_rdw) (u32 addr) = rdw; 227u32(X86APIP sys_rdl) (u32 addr) = rdl; 228void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb; 229void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw; 230void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl; 231u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb; 232u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw; 233u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl; 234void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb; 235void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw; 236void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl; 237 238/*----------------------------- Setup -------------------------------------*/ 239 240/**************************************************************************** 241PARAMETERS: 242funcs - New memory function pointers to make active 243 244REMARKS: 245This function is used to set the pointers to functions which access 246memory space, allowing the user application to override these functions 247and hook them out as necessary for their application. 248****************************************************************************/ 249void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs) 250{ 251 sys_rdb = funcs->rdb; 252 sys_rdw = funcs->rdw; 253 sys_rdl = funcs->rdl; 254 sys_wrb = funcs->wrb; 255 sys_wrw = funcs->wrw; 256 sys_wrl = funcs->wrl; 257} 258 259/**************************************************************************** 260PARAMETERS: 261funcs - New programmed I/O function pointers to make active 262 263REMARKS: 264This function is used to set the pointers to functions which access 265I/O space, allowing the user application to override these functions 266and hook them out as necessary for their application. 267****************************************************************************/ 268void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs) 269{ 270 sys_inb = funcs->inb; 271 sys_inw = funcs->inw; 272 sys_inl = funcs->inl; 273 sys_outb = funcs->outb; 274 sys_outw = funcs->outw; 275 sys_outl = funcs->outl; 276} 277 278void X86EMU_setupIntrFunc(int intnum, X86EMU_intrFuncs func) 279{ 280 _X86EMU_intrTab[intnum] = func; 281} 282 283/**************************************************************************** 284PARAMETERS: 285funcs - New interrupt vector table to make active 286 287REMARKS: 288This function is used to set the pointers to functions which handle 289interrupt processing in the emulator, allowing the user application to 290hook interrupts as necessary for their application. Any interrupts that 291are not hooked by the user application, and reflected and handled internally 292in the emulator via the interrupt vector table. This allows the application 293to get control when the code being emulated executes specific software 294interrupts. 295****************************************************************************/ 296void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[]) 297{ 298 int i; 299 300 for (i = 0; i < 256; i++) 301 _X86EMU_intrTab[i] = NULL; 302 if (funcs) { 303 for (i = 0; i < 256; i++) 304 _X86EMU_intrTab[i] = funcs[i]; 305 } 306} 307 308/**************************************************************************** 309PARAMETERS: 310int - New software interrupt to prepare for 311 312REMARKS: 313This function is used to set up the emulator state to exceute a software 314interrupt. This can be used by the user application code to allow an 315interrupt to be hooked, examined and then reflected back to the emulator 316so that the code in the emulator will continue processing the software 317interrupt as per normal. This essentially allows system code to actively 318hook and handle certain software interrupts as necessary. 319****************************************************************************/ 320void X86EMU_prepareForInt(int num) 321{ 322 push_word((u16) M.x86.R_FLG); 323 CLEAR_FLAG(F_IF); 324 CLEAR_FLAG(F_TF); 325 push_word(M.x86.R_CS); 326 M.x86.R_CS = mem_access_word(num * 4 + 2); 327 push_word(M.x86.R_IP); 328 M.x86.R_IP = mem_access_word(num * 4); 329 M.x86.intr = 0; 330} 331