blob: edda27622e88064ea624c125b107b51bfeb911ff [file] [log] [blame]
Jason Jinece92f82007-07-06 08:34:56 +08001/****************************************************************************
2*
3* BIOS emulator and interface
4* to Realmode X86 Emulator Library
5*
6* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
7* Jason Jin <Jason.jin@freescale.com>
8*
9* Copyright (C) 1996-1999 SciTech Software, Inc.
10*
11* ========================================================================
12*
13* Permission to use, copy, modify, distribute, and sell this software and
14* its documentation for any purpose is hereby granted without fee,
15* provided that the above copyright notice appear in all copies and that
16* both that copyright notice and this permission notice appear in
17* supporting documentation, and that the name of the authors not be used
18* in advertising or publicity pertaining to distribution of the software
19* without specific, written prior permission. The authors makes no
20* representations about the suitability of this software for any purpose.
21* It is provided "as is" without express or implied warranty.
22*
23* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
24* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
25* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
26* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
27* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
28* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
29* PERFORMANCE OF THIS SOFTWARE.
30*
31* ========================================================================
32*
33* Language: ANSI C
34* Environment: Any
35* Developer: Kendall Bennett
36*
37* Description: Module implementing the BIOS specific functions.
38*
Wolfgang Denk53677ef2008-05-20 16:00:29 +020039* Jason ported this file to u-boot to run the ATI video card
40* video BIOS.
Jason Jinece92f82007-07-06 08:34:56 +080041*
42****************************************************************************/
43
Michal Simek78cff502007-08-16 10:46:28 +020044#include <common.h>
Jason Jinece92f82007-07-06 08:34:56 +080045#include "biosemui.h"
46
47/*----------------------------- Implementation ----------------------------*/
48
49/****************************************************************************
50PARAMETERS:
51intno - Interrupt number being serviced
52
53REMARKS:
54Handler for undefined interrupts.
55****************************************************************************/
56static void X86API undefined_intr(int intno)
57{
58 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
59 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
60 } else
61 X86EMU_prepareForInt(intno);
62}
63
64/****************************************************************************
65PARAMETERS:
66intno - Interrupt number being serviced
67
68REMARKS:
69This function handles the default system BIOS Int 10h (the default is stored
70in the Int 42h vector by the system BIOS at bootup). We only need to handle
71a small number of special functions used by the BIOS during POST time.
72****************************************************************************/
73static void X86API int42(int intno)
74{
75 if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) {
76 if (M.x86.R_AL == 0) {
77 /* Enable CPU accesses to video memory */
78 PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02);
79 return;
80 } else if (M.x86.R_AL == 1) {
81 /* Disable CPU accesses to video memory */
82 PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
83 return;
84 }
85#ifdef DEBUG
86 else {
87 printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
88 M.x86.R_AL);
89 }
90#endif
91 }
92#ifdef DEBUG
93 else {
94 printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",
95 M.x86.R_AH, M.x86.R_AL, M.x86.R_BL);
96 }
97#endif
98}
99
100/****************************************************************************
101PARAMETERS:
102intno - Interrupt number being serviced
103
104REMARKS:
105This function handles the default system BIOS Int 10h. If the POST code
106has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
107by simply calling the int42 interrupt handler above. Very early in the
108BIOS POST process, the vector gets replaced and we simply let the real
109mode interrupt handler process the interrupt.
110****************************************************************************/
111static void X86API int10(int intno)
112{
113 if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
114 int42(intno);
115 else
116 X86EMU_prepareForInt(intno);
117}
118
119/* Result codes returned by the PCI BIOS */
120
121#define SUCCESSFUL 0x00
122#define FUNC_NOT_SUPPORT 0x81
123#define BAD_VENDOR_ID 0x83
124#define DEVICE_NOT_FOUND 0x86
125#define BAD_REGISTER_NUMBER 0x87
126#define SET_FAILED 0x88
127#define BUFFER_TOO_SMALL 0x89
128
129/****************************************************************************
130PARAMETERS:
131intno - Interrupt number being serviced
132
133REMARKS:
134This function handles the default Int 1Ah interrupt handler for the real
135mode code, which provides support for the PCI BIOS functions. Since we only
136want to allow the real mode BIOS code *only* see the PCI config space for
137its own device, we only return information for the specific PCI config
138space that we have passed in to the init function. This solves problems
139when using the BIOS to warm boot a secondary adapter when there is an
140identical adapter before it on the bus (some BIOS'es get confused in this
141case).
142****************************************************************************/
143static void X86API int1A(int unused)
144{
145 u16 pciSlot;
146
147#ifdef __KERNEL__
148 u8 interface, subclass, baseclass;
149
150 /* Initialise the PCI slot number */
151 pciSlot = ((int)_BE_env.vgaInfo.bus << 8) |
152 ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function;
153#else
154/* Fail if no PCI device information has been registered */
155 if (!_BE_env.vgaInfo.pciInfo)
156 return;
157
158 pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
159#endif
160 switch (M.x86.R_AX) {
161 case 0xB101: /* PCI bios present? */
162 M.x86.R_AL = 0x00; /* no config space/special cycle generation support */
163 M.x86.R_EDX = 0x20494350; /* " ICP" */
164 M.x86.R_BX = 0x0210; /* Version 2.10 */
165 M.x86.R_CL = 0; /* Max bus number in system */
166 CLEAR_FLAG(F_CF);
167 break;
168 case 0xB102: /* Find PCI device */
169 M.x86.R_AH = DEVICE_NOT_FOUND;
170#ifdef __KERNEL__
171 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
172 M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
173#else
174 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
175 M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
176 M.x86.R_SI == 0) {
177#endif
178 M.x86.R_AH = SUCCESSFUL;
179 M.x86.R_BX = pciSlot;
180 }
181 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
182 break;
183 case 0xB103: /* Find PCI class code */
184 M.x86.R_AH = DEVICE_NOT_FOUND;
185#ifdef __KERNEL__
186 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
187 &interface);
188 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
189 &subclass);
190 pci_read_config_byte(_BE_env.vgaInfo.pcidev,
191 PCI_CLASS_DEVICE + 1, &baseclass);
192 if (M.x86.R_CL == interface && M.x86.R_CH == subclass
193 && (u8) (M.x86.R_ECX >> 16) == baseclass) {
194#else
195 if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
196 M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
197 (u8) (M.x86.R_ECX >> 16) ==
198 _BE_env.vgaInfo.pciInfo->BaseClass) {
199#endif
200 M.x86.R_AH = SUCCESSFUL;
201 M.x86.R_BX = pciSlot;
202 }
203 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
204 break;
205 case 0xB108: /* Read configuration byte */
206 M.x86.R_AH = BAD_REGISTER_NUMBER;
207 if (M.x86.R_BX == pciSlot) {
208 M.x86.R_AH = SUCCESSFUL;
209#ifdef __KERNEL__
210 pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
211 &M.x86.R_CL);
212#else
213 M.x86.R_CL =
214 (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
215 _BE_env.vgaInfo.pciInfo);
216#endif
217 }
218 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
219 break;
220 case 0xB109: /* Read configuration word */
221 M.x86.R_AH = BAD_REGISTER_NUMBER;
222 if (M.x86.R_BX == pciSlot) {
223 M.x86.R_AH = SUCCESSFUL;
224#ifdef __KERNEL__
225 pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
226 &M.x86.R_CX);
227#else
228 M.x86.R_CX =
229 (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
230 _BE_env.vgaInfo.pciInfo);
231#endif
232 }
233 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
234 break;
235 case 0xB10A: /* Read configuration dword */
236 M.x86.R_AH = BAD_REGISTER_NUMBER;
237 if (M.x86.R_BX == pciSlot) {
238 M.x86.R_AH = SUCCESSFUL;
239#ifdef __KERNEL__
240 pci_read_config_dword(_BE_env.vgaInfo.pcidev,
241 M.x86.R_DI, &M.x86.R_ECX);
242#else
243 M.x86.R_ECX =
244 (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
245 _BE_env.vgaInfo.pciInfo);
246#endif
247 }
248 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
249 break;
250 case 0xB10B: /* Write configuration byte */
251 M.x86.R_AH = BAD_REGISTER_NUMBER;
252 if (M.x86.R_BX == pciSlot) {
253 M.x86.R_AH = SUCCESSFUL;
254#ifdef __KERNEL__
255 pci_write_config_byte(_BE_env.vgaInfo.pcidev,
256 M.x86.R_DI, M.x86.R_CL);
257#else
258 PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
259 _BE_env.vgaInfo.pciInfo);
260#endif
261 }
262 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
263 break;
264 case 0xB10C: /* Write configuration word */
265 M.x86.R_AH = BAD_REGISTER_NUMBER;
266 if (M.x86.R_BX == pciSlot) {
267 M.x86.R_AH = SUCCESSFUL;
268#ifdef __KERNEL__
269 pci_write_config_word(_BE_env.vgaInfo.pcidev,
270 M.x86.R_DI, M.x86.R_CX);
271#else
272 PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
273 _BE_env.vgaInfo.pciInfo);
274#endif
275 }
276 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
277 break;
278 case 0xB10D: /* Write configuration dword */
279 M.x86.R_AH = BAD_REGISTER_NUMBER;
280 if (M.x86.R_BX == pciSlot) {
281 M.x86.R_AH = SUCCESSFUL;
282#ifdef __KERNEL__
283 pci_write_config_dword(_BE_env.vgaInfo.pcidev,
284 M.x86.R_DI, M.x86.R_ECX);
285#else
286 PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
287 _BE_env.vgaInfo.pciInfo);
288#endif
289 }
290 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
291 break;
292 default:
293 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
294 M.x86.R_AX);
295 }
296}
297
298/****************************************************************************
299REMARKS:
300This function initialises the BIOS emulation functions for the specific
301PCI display device. We insulate the real mode BIOS from any other devices
302on the bus, so that it will work correctly thinking that it is the only
303device present on the bus (ie: avoiding any adapters present in from of
304the device we are trying to control).
305****************************************************************************/
306#define BE_constLE_32(v) ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))
307
308void _BE_bios_init(u32 * intrTab)
309{
310 int i;
311 X86EMU_intrFuncs bios_intr_tab[256];
312
313 for (i = 0; i < 256; ++i) {
314 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
315 bios_intr_tab[i] = undefined_intr;
316 }
317 bios_intr_tab[0x10] = int10;
318 bios_intr_tab[0x1A] = int1A;
319 bios_intr_tab[0x42] = int42;
320 bios_intr_tab[0x6D] = int10;
321 X86EMU_setupIntrFuncs(bios_intr_tab);
322}