summaryrefslogtreecommitdiff
path: root/src/device/oprom/x86emu/sys.c
blob: 7a9e3921ec2394c89bf2b13727fe0a830ee030a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
/****************************************************************************
*
*						Realmode X86 Emulator Library
*
*            	Copyright (C) 1996-1999 SciTech Software, Inc.
* 				     Copyright (C) David Mosberger-Tang
* 					   Copyright (C) 1999 Egbert Eich
*
*  ========================================================================
*
*  Permission to use, copy, modify, distribute, and sell this software and
*  its documentation for any purpose is hereby granted without fee,
*  provided that the above copyright notice appear in all copies and that
*  both that copyright notice and this permission notice appear in
*  supporting documentation, and that the name of the authors not be used
*  in advertising or publicity pertaining to distribution of the software
*  without specific, written prior permission.  The authors makes no
*  representations about the suitability of this software for any purpose.
*  It is provided "as is" without express or implied warranty.
*
*  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
*  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
*  EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
*  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
*  USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
*  OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
*  PERFORMANCE OF THIS SOFTWARE.
*
*  ========================================================================
*
* Language:		ANSI C
* Environment:	Any
* Developer:    Kendall Bennett
*
* Description:  This file includes subroutines which are related to
*				programmed I/O and memory access. Included in this module
*				are default functions with limited usefulness. For real
*				uses these functions will most likely be overriden by the
*				user library.
*
****************************************************************************/
/* $XFree86: xc/extras/x86emu/src/x86emu/sys.c,v 1.5 2000/08/23 22:10:01 tsi Exp $ */

#include <arch/io.h>
#include <x86emu/x86emu.h>
#include <x86emu/regs.h>
#include "debug.h"
#include "prim_ops.h"

#ifdef IN_MODULE
#include "xf86_ansic.h"
#else
#include <string.h>
#endif
/*------------------------- Global Variables ------------------------------*/

X86EMU_sysEnv _X86EMU_env;	/* Global emulator machine state */
X86EMU_intrFuncs _X86EMU_intrTab[256];

/*----------------------------- Implementation ----------------------------*/

/* compute a pointer. This replaces code scattered all over the place! */
static u8 *mem_ptr(u32 addr, int size)
{
	u8 *retaddr = 0;

	if (addr > M.mem_size - size) {
		DB(printf("mem_ptr: address %#x out of range!\n", addr);)
		    HALT_SYS();
	}
	if (addr < 0x200) {
		//printf("%x:%x updating int vector 0x%x\n",
		//       M.x86.R_CS, M.x86.R_IP, addr >> 2);
	}
	retaddr = (u8 *) (M.mem_base + addr);

	return retaddr;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read

RETURNS:
Byte value read from emulator memory.

REMARKS:
Reads a byte value from the emulator memory.
****************************************************************************/
u8 X86API rdb(u32 addr)
{
	u8 val;
	u8 *ptr;

	ptr = mem_ptr(addr, 1);

	val = *ptr;
	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 1 -> %#x\n", addr, val);)
		return val;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read

RETURNS:
Word value read from emulator memory.

REMARKS:
Reads a word value from the emulator memory.
****************************************************************************/
u16 X86API rdw(u32 addr)
{
	u16 val = 0;
	u8 *ptr;

	ptr = mem_ptr(addr, 2);
	val = *(u16 *) (ptr);

	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 2 -> %#x\n", addr, val);)
	return val;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read

RETURNS:
Long value read from emulator memory.
REMARKS:
Reads a long value from the emulator memory.
****************************************************************************/
u32 X86API rdl(u32 addr)
{
	u32 val = 0;
	u8 *ptr;

	ptr = mem_ptr(addr, 4);
       	val = *(u32 *) (ptr);

	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 4 -> %#x\n", addr, val);)
	return val;
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a byte value to emulator memory.
****************************************************************************/
void X86API wrb(u32 addr, u8 val)
{
	u8 *ptr;

	ptr = mem_ptr(addr, 1);
	*(u8 *) (ptr) = val;

	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 1 <- %#x\n", addr, val);)
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a word value to emulator memory.
****************************************************************************/
void X86API wrw(u32 addr, u16 val)
{
	u8 *ptr;

	ptr = mem_ptr(addr, 2);
	*(u16 *) (ptr) = val;

	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 2 <- %#x\n", addr, val);)
}

/****************************************************************************
PARAMETERS:
addr	- Emulator memory address to read
val		- Value to store

REMARKS:
Writes a long value to emulator memory.
****************************************************************************/
void X86API wrl(u32 addr, u32 val)
{
	u8 *ptr;

	ptr = mem_ptr(addr, 4);
	*(u32 *) (ptr) = val;

	DB(if (DEBUG_MEM_TRACE())
	   printf("%#08x 4 <- %#x\n", addr, val);)


}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO byte read function. Doesn't perform real inb.
****************************************************************************/
static u8 X86API p_inb(X86EMU_pioAddr addr)
{
	DB(if (DEBUG_IO_TRACE())
		printf("inb %#04x \n", addr);)
	return inb(addr);
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO word read function. Doesn't perform real inw.
****************************************************************************/
static u16 X86API p_inw(X86EMU_pioAddr addr)
{
	DB(if (DEBUG_IO_TRACE())
		printf("inw %#04x \n", addr);)
	return inw(addr);
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to read
RETURN:
0
REMARKS:
Default PIO long read function. Doesn't perform real inl.
****************************************************************************/
static u32 X86API p_inl(X86EMU_pioAddr addr)
{
	DB(if (DEBUG_IO_TRACE())
		printf("inl %#04x \n", addr);)
	return inl(addr);
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO byte write function. Doesn't perform real outb.
****************************************************************************/
static void X86API p_outb(X86EMU_pioAddr addr, u8 val)
{
	DB(if (DEBUG_IO_TRACE())
		printf("outb %#02x -> %#04x \n", val, addr);)
	outb(val, addr);
	return;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO word write function. Doesn't perform real outw.
****************************************************************************/
static void X86API p_outw(X86EMU_pioAddr addr, u16 val)
{
	DB(if (DEBUG_IO_TRACE())
		printf("outw %#04x -> %#04x \n", val, addr);)
	outw(val, addr);
	return;
}

/****************************************************************************
PARAMETERS:
addr	- PIO address to write
val     - Value to store
REMARKS:
Default PIO ;ong write function. Doesn't perform real outl.
****************************************************************************/
static void X86API p_outl(X86EMU_pioAddr addr, u32 val)
{
	DB(if (DEBUG_IO_TRACE())
	       printf("outl %#08x -> %#04x \n", val, addr);)

	outl(val, addr);
	return;
}

/*------------------------- Global Variables ------------------------------*/

u8(X86APIP sys_rdb) (u32 addr) = rdb;
u16(X86APIP sys_rdw) (u32 addr) = rdw;
u32(X86APIP sys_rdl) (u32 addr) = rdl;
void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb;
void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw;
void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl;
u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb;
u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw;
u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl;
void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb;
void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw;
void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl;

/*----------------------------- Setup -------------------------------------*/

/****************************************************************************
PARAMETERS:
funcs	- New memory function pointers to make active

REMARKS:
This function is used to set the pointers to functions which access
memory space, allowing the user application to override these functions
and hook them out as necessary for their application.
****************************************************************************/
void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs)
{
	sys_rdb = funcs->rdb;
	sys_rdw = funcs->rdw;
	sys_rdl = funcs->rdl;
	sys_wrb = funcs->wrb;
	sys_wrw = funcs->wrw;
	sys_wrl = funcs->wrl;
}

/****************************************************************************
PARAMETERS:
funcs	- New programmed I/O function pointers to make active

REMARKS:
This function is used to set the pointers to functions which access
I/O space, allowing the user application to override these functions
and hook them out as necessary for their application.
****************************************************************************/
void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs)
{
	sys_inb = funcs->inb;
	sys_inw = funcs->inw;
	sys_inl = funcs->inl;
	sys_outb = funcs->outb;
	sys_outw = funcs->outw;
	sys_outl = funcs->outl;
}

/****************************************************************************
PARAMETERS:
funcs	- New interrupt vector table to make active

REMARKS:
This function is used to set the pointers to functions which handle
interrupt processing in the emulator, allowing the user application to
hook interrupts as necessary for their application. Any interrupts that
are not hooked by the user application, and reflected and handled internally
in the emulator via the interrupt vector table. This allows the application
to get control when the code being emulated executes specific software
interrupts.
****************************************************************************/
void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[])
{
	int i;

	for (i = 0; i < 256; i++)
		_X86EMU_intrTab[i] = NULL;
	if (funcs) {
		for (i = 0; i < 256; i++)
			_X86EMU_intrTab[i] = funcs[i];
	}
}

/****************************************************************************
PARAMETERS:
int	- New software interrupt to prepare for

REMARKS:
This function is used to set up the emulator state to exceute a software
interrupt. This can be used by the user application code to allow an
interrupt to be hooked, examined and then reflected back to the emulator
so that the code in the emulator will continue processing the software
interrupt as per normal. This essentially allows system code to actively
hook and handle certain software interrupts as necessary.
****************************************************************************/
void X86EMU_prepareForInt(int num)
{
	push_word((u16) M.x86.R_FLG);
	CLEAR_FLAG(F_IF);
	CLEAR_FLAG(F_TF);
	push_word(M.x86.R_CS);
	M.x86.R_CS = mem_access_word(num * 4 + 2);
	push_word(M.x86.R_IP);
	M.x86.R_IP = mem_access_word(num * 4);
	M.x86.intr = 0;
}

void X86EMU_setMemBase(void *base, size_t size)
{
	M.mem_base = (unsigned long) base;
	M.mem_size = size;
}