drivers/bios_emulator/bios.c

   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