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 * 39 * Jason ported this file to u-boot to run the ATI video card 40 * video BIOS. 41 * 42 ****************************************************************************/ 43 44 #if defined(CONFIG_BIOSEMU) 45 46 #include "biosemui.h" 47 48 /*----------------------------- Implementation ----------------------------*/ 49 50 /**************************************************************************** 51 PARAMETERS: 52 intno - Interrupt number being serviced 53 54 REMARKS: 55 Handler for undefined interrupts. 56 ****************************************************************************/ 57 static void X86API undefined_intr(int intno) 58 { 59 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) { 60 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);) 61 } else 62 X86EMU_prepareForInt(intno); 63 } 64 65 /**************************************************************************** 66 PARAMETERS: 67 intno - Interrupt number being serviced 68 69 REMARKS: 70 This function handles the default system BIOS Int 10h (the default is stored 71 in the Int 42h vector by the system BIOS at bootup). We only need to handle 72 a small number of special functions used by the BIOS during POST time. 73 ****************************************************************************/ 74 static void X86API int42(int intno) 75 { 76 if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) { 77 if (M.x86.R_AL == 0) { 78 /* Enable CPU accesses to video memory */ 79 PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02); 80 return; 81 } else if (M.x86.R_AL == 1) { 82 /* Disable CPU accesses to video memory */ 83 PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02); 84 return; 85 } 86 #ifdef DEBUG 87 else { 88 printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n", 89 M.x86.R_AL); 90 } 91 #endif 92 } 93 #ifdef DEBUG 94 else { 95 printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n", 96 M.x86.R_AH, M.x86.R_AL, M.x86.R_BL); 97 } 98 #endif 99 } 100 101 /**************************************************************************** 102 PARAMETERS: 103 intno - Interrupt number being serviced 104 105 REMARKS: 106 This function handles the default system BIOS Int 10h. If the POST code 107 has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this 108 by simply calling the int42 interrupt handler above. Very early in the 109 BIOS POST process, the vector gets replaced and we simply let the real 110 mode interrupt handler process the interrupt. 111 ****************************************************************************/ 112 static void X86API int10(int intno) 113 { 114 if (BE_rdw(intno * 4 + 2) == BIOS_SEG) 115 int42(intno); 116 else 117 X86EMU_prepareForInt(intno); 118 } 119 120 /* Result codes returned by the PCI BIOS */ 121 122 #define SUCCESSFUL 0x00 123 #define FUNC_NOT_SUPPORT 0x81 124 #define BAD_VENDOR_ID 0x83 125 #define DEVICE_NOT_FOUND 0x86 126 #define BAD_REGISTER_NUMBER 0x87 127 #define SET_FAILED 0x88 128 #define BUFFER_TOO_SMALL 0x89 129 130 /**************************************************************************** 131 PARAMETERS: 132 intno - Interrupt number being serviced 133 134 REMARKS: 135 This function handles the default Int 1Ah interrupt handler for the real 136 mode code, which provides support for the PCI BIOS functions. Since we only 137 want to allow the real mode BIOS code *only* see the PCI config space for 138 its own device, we only return information for the specific PCI config 139 space that we have passed in to the init function. This solves problems 140 when using the BIOS to warm boot a secondary adapter when there is an 141 identical adapter before it on the bus (some BIOS'es get confused in this 142 case). 143 ****************************************************************************/ 144 static void X86API int1A(int unused) 145 { 146 u16 pciSlot; 147 148 #ifdef __KERNEL__ 149 u8 interface, subclass, baseclass; 150 151 /* Initialise the PCI slot number */ 152 pciSlot = ((int)_BE_env.vgaInfo.bus << 8) | 153 ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function; 154 #else 155 /* Fail if no PCI device information has been registered */ 156 if (!_BE_env.vgaInfo.pciInfo) 157 return; 158 159 pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8); 160 #endif 161 switch (M.x86.R_AX) { 162 case 0xB101: /* PCI bios present? */ 163 M.x86.R_AL = 0x00; /* no config space/special cycle generation support */ 164 M.x86.R_EDX = 0x20494350; /* " ICP" */ 165 M.x86.R_BX = 0x0210; /* Version 2.10 */ 166 M.x86.R_CL = 0; /* Max bus number in system */ 167 CLEAR_FLAG(F_CF); 168 break; 169 case 0xB102: /* Find PCI device */ 170 M.x86.R_AH = DEVICE_NOT_FOUND; 171 #ifdef __KERNEL__ 172 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID && 173 M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) { 174 #else 175 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID && 176 M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID && 177 M.x86.R_SI == 0) { 178 #endif 179 M.x86.R_AH = SUCCESSFUL; 180 M.x86.R_BX = pciSlot; 181 } 182 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 183 break; 184 case 0xB103: /* Find PCI class code */ 185 M.x86.R_AH = DEVICE_NOT_FOUND; 186 #ifdef __KERNEL__ 187 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG, 188 &interface); 189 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE, 190 &subclass); 191 pci_read_config_byte(_BE_env.vgaInfo.pcidev, 192 PCI_CLASS_DEVICE + 1, &baseclass); 193 if (M.x86.R_CL == interface && M.x86.R_CH == subclass 194 && (u8) (M.x86.R_ECX >> 16) == baseclass) { 195 #else 196 if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface && 197 M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass && 198 (u8) (M.x86.R_ECX >> 16) == 199 _BE_env.vgaInfo.pciInfo->BaseClass) { 200 #endif 201 M.x86.R_AH = SUCCESSFUL; 202 M.x86.R_BX = pciSlot; 203 } 204 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 205 break; 206 case 0xB108: /* Read configuration byte */ 207 M.x86.R_AH = BAD_REGISTER_NUMBER; 208 if (M.x86.R_BX == pciSlot) { 209 M.x86.R_AH = SUCCESSFUL; 210 #ifdef __KERNEL__ 211 pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI, 212 &M.x86.R_CL); 213 #else 214 M.x86.R_CL = 215 (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE, 216 _BE_env.vgaInfo.pciInfo); 217 #endif 218 } 219 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 220 break; 221 case 0xB109: /* Read configuration word */ 222 M.x86.R_AH = BAD_REGISTER_NUMBER; 223 if (M.x86.R_BX == pciSlot) { 224 M.x86.R_AH = SUCCESSFUL; 225 #ifdef __KERNEL__ 226 pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI, 227 &M.x86.R_CX); 228 #else 229 M.x86.R_CX = 230 (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD, 231 _BE_env.vgaInfo.pciInfo); 232 #endif 233 } 234 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 235 break; 236 case 0xB10A: /* Read configuration dword */ 237 M.x86.R_AH = BAD_REGISTER_NUMBER; 238 if (M.x86.R_BX == pciSlot) { 239 M.x86.R_AH = SUCCESSFUL; 240 #ifdef __KERNEL__ 241 pci_read_config_dword(_BE_env.vgaInfo.pcidev, 242 M.x86.R_DI, &M.x86.R_ECX); 243 #else 244 M.x86.R_ECX = 245 (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD, 246 _BE_env.vgaInfo.pciInfo); 247 #endif 248 } 249 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 250 break; 251 case 0xB10B: /* Write configuration byte */ 252 M.x86.R_AH = BAD_REGISTER_NUMBER; 253 if (M.x86.R_BX == pciSlot) { 254 M.x86.R_AH = SUCCESSFUL; 255 #ifdef __KERNEL__ 256 pci_write_config_byte(_BE_env.vgaInfo.pcidev, 257 M.x86.R_DI, M.x86.R_CL); 258 #else 259 PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE, 260 _BE_env.vgaInfo.pciInfo); 261 #endif 262 } 263 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 264 break; 265 case 0xB10C: /* Write configuration word */ 266 M.x86.R_AH = BAD_REGISTER_NUMBER; 267 if (M.x86.R_BX == pciSlot) { 268 M.x86.R_AH = SUCCESSFUL; 269 #ifdef __KERNEL__ 270 pci_write_config_word(_BE_env.vgaInfo.pcidev, 271 M.x86.R_DI, M.x86.R_CX); 272 #else 273 PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD, 274 _BE_env.vgaInfo.pciInfo); 275 #endif 276 } 277 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 278 break; 279 case 0xB10D: /* Write configuration dword */ 280 M.x86.R_AH = BAD_REGISTER_NUMBER; 281 if (M.x86.R_BX == pciSlot) { 282 M.x86.R_AH = SUCCESSFUL; 283 #ifdef __KERNEL__ 284 pci_write_config_dword(_BE_env.vgaInfo.pcidev, 285 M.x86.R_DI, M.x86.R_ECX); 286 #else 287 PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD, 288 _BE_env.vgaInfo.pciInfo); 289 #endif 290 } 291 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); 292 break; 293 default: 294 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n", 295 M.x86.R_AX); 296 } 297 } 298 299 /**************************************************************************** 300 REMARKS: 301 This function initialises the BIOS emulation functions for the specific 302 PCI display device. We insulate the real mode BIOS from any other devices 303 on the bus, so that it will work correctly thinking that it is the only 304 device present on the bus (ie: avoiding any adapters present in from of 305 the device we are trying to control). 306 ****************************************************************************/ 307 #define BE_constLE_32(v) ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16)) 308 309 void _BE_bios_init(u32 * intrTab) 310 { 311 int i; 312 X86EMU_intrFuncs bios_intr_tab[256]; 313 314 for (i = 0; i < 256; ++i) { 315 intrTab[i] = BE_constLE_32(BIOS_SEG << 16); 316 bios_intr_tab[i] = undefined_intr; 317 } 318 bios_intr_tab[0x10] = int10; 319 bios_intr_tab[0x1A] = int1A; 320 bios_intr_tab[0x42] = int42; 321 bios_intr_tab[0x6D] = int10; 322 X86EMU_setupIntrFuncs(bios_intr_tab); 323 } 324 #endif 325