summaryrefslogtreecommitdiff
path: root/drivers/bios_emulator/bios.c
blob: 7cf48792eb7ea98f72264fad70e95cb4318080ec (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
/****************************************************************************
*
*                        BIOS emulator and interface
*                      to Realmode X86 Emulator Library
*
*  Copyright (C) 2007 Freescale Semiconductor, Inc.
*  Jason Jin <Jason.jin@freescale.com>
*
*               Copyright (C) 1996-1999 SciTech Software, Inc.
*
*  ========================================================================
*
*  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:  Module implementing the BIOS specific functions.
*
*		Jason ported this file to u-boot to run the ATI video card
*		video BIOS.
*
****************************************************************************/

#include <common.h>
#include "biosemui.h"

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

/****************************************************************************
PARAMETERS:
intno   - Interrupt number being serviced

REMARKS:
Handler for undefined interrupts.
****************************************************************************/
static void X86API undefined_intr(int intno)
{
	if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
		DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
	} else
		X86EMU_prepareForInt(intno);
}

/****************************************************************************
PARAMETERS:
intno   - Interrupt number being serviced

REMARKS:
This function handles the default system BIOS Int 10h (the default is stored
in the Int 42h vector by the system BIOS at bootup). We only need to handle
a small number of special functions used by the BIOS during POST time.
****************************************************************************/
static void X86API int42(int intno)
{
	if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) {
		if (M.x86.R_AL == 0) {
			/* Enable CPU accesses to video memory */
			PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02);
			return;
		} else if (M.x86.R_AL == 1) {
			/* Disable CPU accesses to video memory */
			PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
			return;
		}
#ifdef  DEBUG
		else {
			printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
			     M.x86.R_AL);
		}
#endif
	}
#ifdef  DEBUG
	else {
		printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",
		     M.x86.R_AH, M.x86.R_AL, M.x86.R_BL);
	}
#endif
}

/****************************************************************************
PARAMETERS:
intno   - Interrupt number being serviced

REMARKS:
This function handles the default system BIOS Int 10h. If the POST code
has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
by simply calling the int42 interrupt handler above. Very early in the
BIOS POST process, the vector gets replaced and we simply let the real
mode interrupt handler process the interrupt.
****************************************************************************/
static void X86API int10(int intno)
{
	if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
		int42(intno);
	else
		X86EMU_prepareForInt(intno);
}

/* Result codes returned by the PCI BIOS */

#define SUCCESSFUL          0x00
#define FUNC_NOT_SUPPORT    0x81
#define BAD_VENDOR_ID       0x83
#define DEVICE_NOT_FOUND    0x86
#define BAD_REGISTER_NUMBER 0x87
#define SET_FAILED          0x88
#define BUFFER_TOO_SMALL    0x89

/****************************************************************************
PARAMETERS:
intno   - Interrupt number being serviced

REMARKS:
This function handles the default Int 1Ah interrupt handler for the real
mode code, which provides support for the PCI BIOS functions. Since we only
want to allow the real mode BIOS code *only* see the PCI config space for
its own device, we only return information for the specific PCI config
space that we have passed in to the init function. This solves problems
when using the BIOS to warm boot a secondary adapter when there is an
identical adapter before it on the bus (some BIOS'es get confused in this
case).
****************************************************************************/
static void X86API int1A(int unused)
{
	u16 pciSlot;

#ifdef __KERNEL__
	u8 interface, subclass, baseclass;

	/* Initialise the PCI slot number */
	pciSlot = ((int)_BE_env.vgaInfo.bus << 8) |
	    ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function;
#else
/* Fail if no PCI device information has been registered */
	if (!_BE_env.vgaInfo.pciInfo)
		return;

	pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
#endif
	switch (M.x86.R_AX) {
	case 0xB101:		/* PCI bios present? */
		M.x86.R_AL = 0x00;	/* no config space/special cycle generation support */
		M.x86.R_EDX = 0x20494350;	/* " ICP" */
		M.x86.R_BX = 0x0210;	/* Version 2.10 */
		M.x86.R_CL = 0;	/* Max bus number in system */
		CLEAR_FLAG(F_CF);
		break;
	case 0xB102:		/* Find PCI device */
		M.x86.R_AH = DEVICE_NOT_FOUND;
#ifdef __KERNEL__
		if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
		    M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
#else
		if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
		    M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
		    M.x86.R_SI == 0) {
#endif
			M.x86.R_AH = SUCCESSFUL;
			M.x86.R_BX = pciSlot;
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB103:		/* Find PCI class code */
		M.x86.R_AH = DEVICE_NOT_FOUND;
#ifdef __KERNEL__
		pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
				     &interface);
		pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
				     &subclass);
		pci_read_config_byte(_BE_env.vgaInfo.pcidev,
				     PCI_CLASS_DEVICE + 1, &baseclass);
		if (M.x86.R_CL == interface && M.x86.R_CH == subclass
		    && (u8) (M.x86.R_ECX >> 16) == baseclass) {
#else
		if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
		    M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
		    (u8) (M.x86.R_ECX >> 16) ==
		    _BE_env.vgaInfo.pciInfo->BaseClass) {
#endif
			M.x86.R_AH = SUCCESSFUL;
			M.x86.R_BX = pciSlot;
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB108:		/* Read configuration byte */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
					     &M.x86.R_CL);
#else
			M.x86.R_CL =
			    (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
					       _BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB109:		/* Read configuration word */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
					     &M.x86.R_CX);
#else
			M.x86.R_CX =
			    (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
						_BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB10A:		/* Read configuration dword */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_read_config_dword(_BE_env.vgaInfo.pcidev,
					      M.x86.R_DI, &M.x86.R_ECX);
#else
			M.x86.R_ECX =
			    (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
						_BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB10B:		/* Write configuration byte */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_write_config_byte(_BE_env.vgaInfo.pcidev,
					      M.x86.R_DI, M.x86.R_CL);
#else
			PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
				      _BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB10C:		/* Write configuration word */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_write_config_word(_BE_env.vgaInfo.pcidev,
					      M.x86.R_DI, M.x86.R_CX);
#else
			PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
				      _BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	case 0xB10D:		/* Write configuration dword */
		M.x86.R_AH = BAD_REGISTER_NUMBER;
		if (M.x86.R_BX == pciSlot) {
			M.x86.R_AH = SUCCESSFUL;
#ifdef __KERNEL__
			pci_write_config_dword(_BE_env.vgaInfo.pcidev,
					       M.x86.R_DI, M.x86.R_ECX);
#else
			PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
				      _BE_env.vgaInfo.pciInfo);
#endif
		}
		CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
		break;
	default:
		printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
		       M.x86.R_AX);
	}
}

/****************************************************************************
REMARKS:
This function initialises the BIOS emulation functions for the specific
PCI display device. We insulate the real mode BIOS from any other devices
on the bus, so that it will work correctly thinking that it is the only
device present on the bus (ie: avoiding any adapters present in from of
the device we are trying to control).
****************************************************************************/
#define BE_constLE_32(v)    ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))

void _BE_bios_init(u32 * intrTab)
{
	int i;
	X86EMU_intrFuncs bios_intr_tab[256];

	for (i = 0; i < 256; ++i) {
		intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
		bios_intr_tab[i] = undefined_intr;
	}
	bios_intr_tab[0x10] = int10;
	bios_intr_tab[0x1A] = int1A;
	bios_intr_tab[0x42] = int42;
	bios_intr_tab[0x6D] = int10;
	X86EMU_setupIntrFuncs(bios_intr_tab);
}