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 #if defined(CONFIG_BIOSEMU)
50 /*----------------------------- Implementation ----------------------------*/
52 /****************************************************************************
54 intno - Interrupt number being serviced
57 Handler for undefined interrupts.
58 ****************************************************************************/
59 static void X86API undefined_intr(int intno)
61 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
62 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
64 X86EMU_prepareForInt(intno);
67 /****************************************************************************
69 intno - Interrupt number being serviced
72 This function handles the default system BIOS Int 10h (the default is stored
73 in the Int 42h vector by the system BIOS at bootup). We only need to handle
74 a small number of special functions used by the BIOS during POST time.
75 ****************************************************************************/
76 static void X86API int42(int intno)
78 if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) {
79 if (M.x86.R_AL == 0) {
80 /* Enable CPU accesses to video memory */
81 PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02);
83 } else if (M.x86.R_AL == 1) {
84 /* Disable CPU accesses to video memory */
85 PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
90 printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
97 printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",
98 M.x86.R_AH, M.x86.R_AL, M.x86.R_BL);
103 /****************************************************************************
105 intno - Interrupt number being serviced
108 This function handles the default system BIOS Int 10h. If the POST code
109 has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
110 by simply calling the int42 interrupt handler above. Very early in the
111 BIOS POST process, the vector gets replaced and we simply let the real
112 mode interrupt handler process the interrupt.
113 ****************************************************************************/
114 static void X86API int10(int intno)
116 if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
119 X86EMU_prepareForInt(intno);
122 /* Result codes returned by the PCI BIOS */
124 #define SUCCESSFUL 0x00
125 #define FUNC_NOT_SUPPORT 0x81
126 #define BAD_VENDOR_ID 0x83
127 #define DEVICE_NOT_FOUND 0x86
128 #define BAD_REGISTER_NUMBER 0x87
129 #define SET_FAILED 0x88
130 #define BUFFER_TOO_SMALL 0x89
132 /****************************************************************************
134 intno - Interrupt number being serviced
137 This function handles the default Int 1Ah interrupt handler for the real
138 mode code, which provides support for the PCI BIOS functions. Since we only
139 want to allow the real mode BIOS code *only* see the PCI config space for
140 its own device, we only return information for the specific PCI config
141 space that we have passed in to the init function. This solves problems
142 when using the BIOS to warm boot a secondary adapter when there is an
143 identical adapter before it on the bus (some BIOS'es get confused in this
145 ****************************************************************************/
146 static void X86API int1A(int unused)
151 u8 interface, subclass, baseclass;
153 /* Initialise the PCI slot number */
154 pciSlot = ((int)_BE_env.vgaInfo.bus << 8) |
155 ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function;
157 /* Fail if no PCI device information has been registered */
158 if (!_BE_env.vgaInfo.pciInfo)
161 pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
163 switch (M.x86.R_AX) {
164 case 0xB101: /* PCI bios present? */
165 M.x86.R_AL = 0x00; /* no config space/special cycle generation support */
166 M.x86.R_EDX = 0x20494350; /* " ICP" */
167 M.x86.R_BX = 0x0210; /* Version 2.10 */
168 M.x86.R_CL = 0; /* Max bus number in system */
171 case 0xB102: /* Find PCI device */
172 M.x86.R_AH = DEVICE_NOT_FOUND;
174 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
175 M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
177 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
178 M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
181 M.x86.R_AH = SUCCESSFUL;
182 M.x86.R_BX = pciSlot;
184 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
186 case 0xB103: /* Find PCI class code */
187 M.x86.R_AH = DEVICE_NOT_FOUND;
189 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
191 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
193 pci_read_config_byte(_BE_env.vgaInfo.pcidev,
194 PCI_CLASS_DEVICE + 1, &baseclass);
195 if (M.x86.R_CL == interface && M.x86.R_CH == subclass
196 && (u8) (M.x86.R_ECX >> 16) == baseclass) {
198 if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
199 M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
200 (u8) (M.x86.R_ECX >> 16) ==
201 _BE_env.vgaInfo.pciInfo->BaseClass) {
203 M.x86.R_AH = SUCCESSFUL;
204 M.x86.R_BX = pciSlot;
206 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
208 case 0xB108: /* Read configuration byte */
209 M.x86.R_AH = BAD_REGISTER_NUMBER;
210 if (M.x86.R_BX == pciSlot) {
211 M.x86.R_AH = SUCCESSFUL;
213 pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
217 (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
218 _BE_env.vgaInfo.pciInfo);
221 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
223 case 0xB109: /* Read configuration word */
224 M.x86.R_AH = BAD_REGISTER_NUMBER;
225 if (M.x86.R_BX == pciSlot) {
226 M.x86.R_AH = SUCCESSFUL;
228 pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
232 (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
233 _BE_env.vgaInfo.pciInfo);
236 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
238 case 0xB10A: /* Read configuration dword */
239 M.x86.R_AH = BAD_REGISTER_NUMBER;
240 if (M.x86.R_BX == pciSlot) {
241 M.x86.R_AH = SUCCESSFUL;
243 pci_read_config_dword(_BE_env.vgaInfo.pcidev,
244 M.x86.R_DI, &M.x86.R_ECX);
247 (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
248 _BE_env.vgaInfo.pciInfo);
251 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
253 case 0xB10B: /* Write configuration byte */
254 M.x86.R_AH = BAD_REGISTER_NUMBER;
255 if (M.x86.R_BX == pciSlot) {
256 M.x86.R_AH = SUCCESSFUL;
258 pci_write_config_byte(_BE_env.vgaInfo.pcidev,
259 M.x86.R_DI, M.x86.R_CL);
261 PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
262 _BE_env.vgaInfo.pciInfo);
265 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
267 case 0xB10C: /* Write configuration word */
268 M.x86.R_AH = BAD_REGISTER_NUMBER;
269 if (M.x86.R_BX == pciSlot) {
270 M.x86.R_AH = SUCCESSFUL;
272 pci_write_config_word(_BE_env.vgaInfo.pcidev,
273 M.x86.R_DI, M.x86.R_CX);
275 PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
276 _BE_env.vgaInfo.pciInfo);
279 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
281 case 0xB10D: /* Write configuration dword */
282 M.x86.R_AH = BAD_REGISTER_NUMBER;
283 if (M.x86.R_BX == pciSlot) {
284 M.x86.R_AH = SUCCESSFUL;
286 pci_write_config_dword(_BE_env.vgaInfo.pcidev,
287 M.x86.R_DI, M.x86.R_ECX);
289 PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
290 _BE_env.vgaInfo.pciInfo);
293 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
296 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
301 /****************************************************************************
303 This function initialises the BIOS emulation functions for the specific
304 PCI display device. We insulate the real mode BIOS from any other devices
305 on the bus, so that it will work correctly thinking that it is the only
306 device present on the bus (ie: avoiding any adapters present in from of
307 the device we are trying to control).
308 ****************************************************************************/
309 #define BE_constLE_32(v) ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))
311 void _BE_bios_init(u32 * intrTab)
314 X86EMU_intrFuncs bios_intr_tab[256];
316 for (i = 0; i < 256; ++i) {
317 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
318 bios_intr_tab[i] = undefined_intr;
320 bios_intr_tab[0x10] = int10;
321 bios_intr_tab[0x1A] = int1A;
322 bios_intr_tab[0x42] = int42;
323 bios_intr_tab[0x6D] = int10;
324 X86EMU_setupIntrFuncs(bios_intr_tab);