1 /****************************************************************************
3 * Realmode X86 Emulator Library
5 * Copyright (C) 1991-2004 SciTech Software, Inc.
6 * Copyright (C) David Mosberger-Tang
7 * Copyright (C) 1999 Egbert Eich
9 * ========================================================================
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.
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.
29 * ========================================================================
33 * Developer: Kendall Bennett
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.
40 ****************************************************************************/
42 #include "x86emu/x86emui.h"
44 #if defined(CONFIG_BIOSEMU)
46 /*------------------------- Global Variables ------------------------------*/
48 X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */
49 X86EMU_intrFuncs _X86EMU_intrTab[256];
53 /*----------------------------- Implementation ----------------------------*/
55 /****************************************************************************
57 addr - Emulator memory address to read
60 Byte value read from emulator memory.
63 Reads a byte value from the emulator memory.
64 ****************************************************************************/
65 u8 X86API rdb(u32 addr)
70 /****************************************************************************
72 addr - Emulator memory address to read
75 Word value read from emulator memory.
78 Reads a word value from the emulator memory.
79 ****************************************************************************/
80 u16 X86API rdw(u32 addr)
85 /****************************************************************************
87 addr - Emulator memory address to read
90 Long value read from emulator memory.
92 Reads a long value from the emulator memory.
93 ****************************************************************************/
94 u32 X86API rdl(u32 addr)
99 /****************************************************************************
101 addr - Emulator memory address to read
105 Writes a byte value to emulator memory.
106 ****************************************************************************/
107 void X86API wrb(u32 addr, u8 val)
111 /****************************************************************************
113 addr - Emulator memory address to read
117 Writes a word value to emulator memory.
118 ****************************************************************************/
119 void X86API wrw(u32 addr, u16 val)
123 /****************************************************************************
125 addr - Emulator memory address to read
129 Writes a long value to emulator memory.
130 ****************************************************************************/
131 void X86API wrl(u32 addr, u32 val)
135 /****************************************************************************
137 addr - PIO address to read
141 Default PIO byte read function. Doesn't perform real inb.
142 ****************************************************************************/
143 static u8 X86API p_inb(X86EMU_pioAddr addr)
145 DB(if (DEBUG_IO_TRACE())
146 printk("inb %#04x \n", addr);)
150 /****************************************************************************
152 addr - PIO address to read
156 Default PIO word read function. Doesn't perform real inw.
157 ****************************************************************************/
158 static u16 X86API p_inw(X86EMU_pioAddr addr)
160 DB(if (DEBUG_IO_TRACE())
161 printk("inw %#04x \n", addr);)
165 /****************************************************************************
167 addr - PIO address to read
171 Default PIO long read function. Doesn't perform real inl.
172 ****************************************************************************/
173 static u32 X86API p_inl(X86EMU_pioAddr addr)
175 DB(if (DEBUG_IO_TRACE())
176 printk("inl %#04x \n", addr);)
180 /****************************************************************************
182 addr - PIO address to write
185 Default PIO byte write function. Doesn't perform real outb.
186 ****************************************************************************/
187 static void X86API p_outb(X86EMU_pioAddr addr, u8 val)
189 DB(if (DEBUG_IO_TRACE())
190 printk("outb %#02x -> %#04x \n", val, addr);)
194 /****************************************************************************
196 addr - PIO address to write
199 Default PIO word write function. Doesn't perform real outw.
200 ****************************************************************************/
201 static void X86API p_outw(X86EMU_pioAddr addr, u16 val)
203 DB(if (DEBUG_IO_TRACE())
204 printk("outw %#04x -> %#04x \n", val, addr);)
208 /****************************************************************************
210 addr - PIO address to write
213 Default PIO ;ong write function. Doesn't perform real outl.
214 ****************************************************************************/
215 static void X86API p_outl(X86EMU_pioAddr addr, u32 val)
217 DB(if (DEBUG_IO_TRACE())
218 printk("outl %#08x -> %#04x \n", val, addr);)
222 /*------------------------- Global Variables ------------------------------*/
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;
237 /*----------------------------- Setup -------------------------------------*/
239 /****************************************************************************
241 funcs - New memory function pointers to make active
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)
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;
258 /****************************************************************************
260 funcs - New programmed I/O function pointers to make active
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)
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;
277 /****************************************************************************
279 funcs - New interrupt vector table to make active
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
289 ****************************************************************************/
290 void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[])
294 for (i = 0; i < 256; i++)
295 _X86EMU_intrTab[i] = NULL;
297 for (i = 0; i < 256; i++)
298 _X86EMU_intrTab[i] = funcs[i];
302 /****************************************************************************
304 int - New software interrupt to prepare for
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)
316 push_word((u16) M.x86.R_FLG);
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);