1 /****************************************************************************
3 * BIOS emulator and interface
4 * to Realmode X86 Emulator Library
6 * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
7 * Jason Jin <Jason.jin@freescale.com>
9 * Copyright (C) 1996-1999 SciTech Software, Inc.
11 * ========================================================================
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.
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.
31 * ========================================================================
35 * Developer: Kendall Bennett
37 * Description: Module implementing the BIOS specific functions.
39 * Jason ported this file to u-boot to run the ATI video card
42 ****************************************************************************/
46 /*----------------------------- Implementation ----------------------------*/
48 /****************************************************************************
50 intno - Interrupt number being serviced
53 Handler for undefined interrupts.
54 ****************************************************************************/
55 static void X86API undefined_intr(int intno)
57 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
58 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
60 X86EMU_prepareForInt(intno);
63 /****************************************************************************
65 intno - Interrupt number being serviced
68 This function handles the default system BIOS Int 10h (the default is stored
69 in the Int 42h vector by the system BIOS at bootup). We only need to handle
70 a small number of special functions used by the BIOS during POST time.
71 ****************************************************************************/
72 static void X86API int42(int intno)
74 if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) {
75 if (M.x86.R_AL == 0) {
76 /* Enable CPU accesses to video memory */
77 PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02);
79 } else if (M.x86.R_AL == 1) {
80 /* Disable CPU accesses to video memory */
81 PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
86 printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
93 printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",
94 M.x86.R_AH, M.x86.R_AL, M.x86.R_BL);
99 /****************************************************************************
101 intno - Interrupt number being serviced
104 This function handles the default system BIOS Int 10h. If the POST code
105 has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
106 by simply calling the int42 interrupt handler above. Very early in the
107 BIOS POST process, the vector gets replaced and we simply let the real
108 mode interrupt handler process the interrupt.
109 ****************************************************************************/
110 static void X86API int10(int intno)
112 if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
115 X86EMU_prepareForInt(intno);
118 /* Result codes returned by the PCI BIOS */
120 #define SUCCESSFUL 0x00
121 #define FUNC_NOT_SUPPORT 0x81
122 #define BAD_VENDOR_ID 0x83
123 #define DEVICE_NOT_FOUND 0x86
124 #define BAD_REGISTER_NUMBER 0x87
125 #define SET_FAILED 0x88
126 #define BUFFER_TOO_SMALL 0x89
128 /****************************************************************************
130 intno - Interrupt number being serviced
133 This function handles the default Int 1Ah interrupt handler for the real
134 mode code, which provides support for the PCI BIOS functions. Since we only
135 want to allow the real mode BIOS code *only* see the PCI config space for
136 its own device, we only return information for the specific PCI config
137 space that we have passed in to the init function. This solves problems
138 when using the BIOS to warm boot a secondary adapter when there is an
139 identical adapter before it on the bus (some BIOS'es get confused in this
141 ****************************************************************************/
142 static void X86API int1A(int unused)
147 u8 interface, subclass, baseclass;
149 /* Initialise the PCI slot number */
150 pciSlot = ((int)_BE_env.vgaInfo.bus << 8) |
151 ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function;
153 /* Fail if no PCI device information has been registered */
154 if (!_BE_env.vgaInfo.pciInfo)
157 pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
159 switch (M.x86.R_AX) {
160 case 0xB101: /* PCI bios present? */
161 M.x86.R_AL = 0x00; /* no config space/special cycle generation support */
162 M.x86.R_EDX = 0x20494350; /* " ICP" */
163 M.x86.R_BX = 0x0210; /* Version 2.10 */
164 M.x86.R_CL = 0; /* Max bus number in system */
167 case 0xB102: /* Find PCI device */
168 M.x86.R_AH = DEVICE_NOT_FOUND;
170 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
171 M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
173 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
174 M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
177 M.x86.R_AH = SUCCESSFUL;
178 M.x86.R_BX = pciSlot;
180 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
182 case 0xB103: /* Find PCI class code */
183 M.x86.R_AH = DEVICE_NOT_FOUND;
185 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
187 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
189 pci_read_config_byte(_BE_env.vgaInfo.pcidev,
190 PCI_CLASS_DEVICE + 1, &baseclass);
191 if (M.x86.R_CL == interface && M.x86.R_CH == subclass
192 && (u8) (M.x86.R_ECX >> 16) == baseclass) {
194 if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
195 M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
196 (u8) (M.x86.R_ECX >> 16) ==
197 _BE_env.vgaInfo.pciInfo->BaseClass) {
199 M.x86.R_AH = SUCCESSFUL;
200 M.x86.R_BX = pciSlot;
202 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
204 case 0xB108: /* Read configuration byte */
205 M.x86.R_AH = BAD_REGISTER_NUMBER;
206 if (M.x86.R_BX == pciSlot) {
207 M.x86.R_AH = SUCCESSFUL;
209 pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
213 (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
214 _BE_env.vgaInfo.pciInfo);
217 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
219 case 0xB109: /* Read configuration word */
220 M.x86.R_AH = BAD_REGISTER_NUMBER;
221 if (M.x86.R_BX == pciSlot) {
222 M.x86.R_AH = SUCCESSFUL;
224 pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
228 (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
229 _BE_env.vgaInfo.pciInfo);
232 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
234 case 0xB10A: /* Read configuration dword */
235 M.x86.R_AH = BAD_REGISTER_NUMBER;
236 if (M.x86.R_BX == pciSlot) {
237 M.x86.R_AH = SUCCESSFUL;
239 pci_read_config_dword(_BE_env.vgaInfo.pcidev,
240 M.x86.R_DI, &M.x86.R_ECX);
243 (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
244 _BE_env.vgaInfo.pciInfo);
247 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
249 case 0xB10B: /* Write configuration byte */
250 M.x86.R_AH = BAD_REGISTER_NUMBER;
251 if (M.x86.R_BX == pciSlot) {
252 M.x86.R_AH = SUCCESSFUL;
254 pci_write_config_byte(_BE_env.vgaInfo.pcidev,
255 M.x86.R_DI, M.x86.R_CL);
257 PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
258 _BE_env.vgaInfo.pciInfo);
261 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
263 case 0xB10C: /* Write configuration word */
264 M.x86.R_AH = BAD_REGISTER_NUMBER;
265 if (M.x86.R_BX == pciSlot) {
266 M.x86.R_AH = SUCCESSFUL;
268 pci_write_config_word(_BE_env.vgaInfo.pcidev,
269 M.x86.R_DI, M.x86.R_CX);
271 PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
272 _BE_env.vgaInfo.pciInfo);
275 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
277 case 0xB10D: /* Write configuration dword */
278 M.x86.R_AH = BAD_REGISTER_NUMBER;
279 if (M.x86.R_BX == pciSlot) {
280 M.x86.R_AH = SUCCESSFUL;
282 pci_write_config_dword(_BE_env.vgaInfo.pcidev,
283 M.x86.R_DI, M.x86.R_ECX);
285 PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
286 _BE_env.vgaInfo.pciInfo);
289 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
292 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
297 /****************************************************************************
299 This function initialises the BIOS emulation functions for the specific
300 PCI display device. We insulate the real mode BIOS from any other devices
301 on the bus, so that it will work correctly thinking that it is the only
302 device present on the bus (ie: avoiding any adapters present in from of
303 the device we are trying to control).
304 ****************************************************************************/
305 #define BE_constLE_32(v) ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))
307 void _BE_bios_init(u32 * intrTab)
310 X86EMU_intrFuncs bios_intr_tab[256];
312 for (i = 0; i < 256; ++i) {
313 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
314 bios_intr_tab[i] = undefined_intr;
316 bios_intr_tab[0x10] = int10;
317 bios_intr_tab[0x1A] = int1A;
318 bios_intr_tab[0x42] = int42;
319 bios_intr_tab[0x6D] = int10;
320 X86EMU_setupIntrFuncs(bios_intr_tab);