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 ****************************************************************************/
47 /*----------------------------- Implementation ----------------------------*/
49 /****************************************************************************
51 intno - Interrupt number being serviced
54 Handler for undefined interrupts.
55 ****************************************************************************/
56 static void X86API undefined_intr(int intno)
58 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
59 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
61 X86EMU_prepareForInt(intno);
64 /****************************************************************************
66 intno - Interrupt number being serviced
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)
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);
80 } else if (M.x86.R_AL == 1) {
81 /* Disable CPU accesses to video memory */
82 PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
87 printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
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);
100 /****************************************************************************
102 intno - Interrupt number being serviced
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)
113 if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
116 X86EMU_prepareForInt(intno);
119 /* Result codes returned by the PCI BIOS */
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
129 /****************************************************************************
131 intno - Interrupt number being serviced
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
142 ****************************************************************************/
143 static void X86API int1A(int unused)
148 u8 interface, subclass, baseclass;
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;
154 /* Fail if no PCI device information has been registered */
155 if (!_BE_env.vgaInfo.pciInfo)
158 pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
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 */
168 case 0xB102: /* Find PCI device */
169 M.x86.R_AH = DEVICE_NOT_FOUND;
171 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
172 M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
174 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
175 M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
178 M.x86.R_AH = SUCCESSFUL;
179 M.x86.R_BX = pciSlot;
181 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
183 case 0xB103: /* Find PCI class code */
184 M.x86.R_AH = DEVICE_NOT_FOUND;
186 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
188 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
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) {
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) {
200 M.x86.R_AH = SUCCESSFUL;
201 M.x86.R_BX = pciSlot;
203 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
210 pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
214 (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
215 _BE_env.vgaInfo.pciInfo);
218 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
225 pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
229 (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
230 _BE_env.vgaInfo.pciInfo);
233 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
240 pci_read_config_dword(_BE_env.vgaInfo.pcidev,
241 M.x86.R_DI, &M.x86.R_ECX);
244 (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
245 _BE_env.vgaInfo.pciInfo);
248 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
255 pci_write_config_byte(_BE_env.vgaInfo.pcidev,
256 M.x86.R_DI, M.x86.R_CL);
258 PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
259 _BE_env.vgaInfo.pciInfo);
262 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
269 pci_write_config_word(_BE_env.vgaInfo.pcidev,
270 M.x86.R_DI, M.x86.R_CX);
272 PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
273 _BE_env.vgaInfo.pciInfo);
276 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
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;
283 pci_write_config_dword(_BE_env.vgaInfo.pcidev,
284 M.x86.R_DI, M.x86.R_ECX);
286 PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
287 _BE_env.vgaInfo.pciInfo);
290 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
293 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
298 /****************************************************************************
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))
308 void _BE_bios_init(u32 * intrTab)
311 X86EMU_intrFuncs bios_intr_tab[256];
313 for (i = 0; i < 256; ++i) {
314 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
315 bios_intr_tab[i] = undefined_intr;
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);