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1 | /**************************************************************************** |
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 | * | |
53677ef1 WD |
39 | * Jason ported this file to u-boot to run the ATI video card |
40 | * video BIOS. | |
ece92f85 JJ |
41 | * |
42 | ****************************************************************************/ | |
43 | ||
78cff50e | 44 | #include <common.h> |
ece92f85 JJ |
45 | #include "biosemui.h" |
46 | ||
47 | /*----------------------------- Implementation ----------------------------*/ | |
48 | ||
49 | /**************************************************************************** | |
50 | PARAMETERS: | |
51 | intno - Interrupt number being serviced | |
52 | ||
53 | REMARKS: | |
54 | Handler for undefined interrupts. | |
55 | ****************************************************************************/ | |
56 | static 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 | /**************************************************************************** | |
65 | PARAMETERS: | |
66 | intno - Interrupt number being serviced | |
67 | ||
68 | REMARKS: | |
69 | This function handles the default system BIOS Int 10h (the default is stored | |
70 | in the Int 42h vector by the system BIOS at bootup). We only need to handle | |
71 | a small number of special functions used by the BIOS during POST time. | |
72 | ****************************************************************************/ | |
73 | static 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 | /**************************************************************************** | |
101 | PARAMETERS: | |
102 | intno - Interrupt number being serviced | |
103 | ||
104 | REMARKS: | |
105 | This function handles the default system BIOS Int 10h. If the POST code | |
106 | has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this | |
107 | by simply calling the int42 interrupt handler above. Very early in the | |
108 | BIOS POST process, the vector gets replaced and we simply let the real | |
109 | mode interrupt handler process the interrupt. | |
110 | ****************************************************************************/ | |
111 | static 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 | /**************************************************************************** | |
130 | PARAMETERS: | |
131 | intno - Interrupt number being serviced | |
132 | ||
133 | REMARKS: | |
134 | This function handles the default Int 1Ah interrupt handler for the real | |
135 | mode code, which provides support for the PCI BIOS functions. Since we only | |
136 | want to allow the real mode BIOS code *only* see the PCI config space for | |
137 | its own device, we only return information for the specific PCI config | |
138 | space that we have passed in to the init function. This solves problems | |
139 | when using the BIOS to warm boot a secondary adapter when there is an | |
140 | identical adapter before it on the bus (some BIOS'es get confused in this | |
141 | case). | |
142 | ****************************************************************************/ | |
143 | static 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 | /**************************************************************************** | |
299 | REMARKS: | |
300 | This function initialises the BIOS emulation functions for the specific | |
301 | PCI display device. We insulate the real mode BIOS from any other devices | |
302 | on the bus, so that it will work correctly thinking that it is the only | |
303 | device present on the bus (ie: avoiding any adapters present in from of | |
304 | the 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 | ||
308 | void _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 | } |