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 #include <common.h>
  45
  46 #if defined(CONFIG_BIOSEMU)
  47
  48 #include "biosemui.h"
  49
  50 /*----------------------------- Implementation ----------------------------*/
  51
  52 /****************************************************************************
  53 PARAMETERS:
  54 intno   - Interrupt number being serviced
  55
  56 REMARKS:
  57 Handler for undefined interrupts.
  58 ****************************************************************************/
  59 static void X86API undefined_intr(int intno)
  60 {
  61         if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
  62                 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
  63         } else
  64                 X86EMU_prepareForInt(intno);
  65 }
  66
  67 /****************************************************************************
  68 PARAMETERS:
  69 intno   - Interrupt number being serviced
  70
  71 REMARKS:
  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)
  77 {
  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);
  82                         return;
  83                 } else if (M.x86.R_AL == 1) {
  84                         /* Disable CPU accesses to video memory */
  85                         PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
  86                         return;
  87                 }
  88 #ifdef  DEBUG
  89                 else {
  90                         printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
  91                              M.x86.R_AL);
  92                 }
  93 #endif
  94         }
  95 #ifdef  DEBUG
  96         else {
  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);
  99         }
 100 #endif
 101 }
 102
 103 /****************************************************************************
 104 PARAMETERS:
 105 intno   - Interrupt number being serviced
 106
 107 REMARKS:
 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)
 115 {
 116         if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
 117                 int42(intno);
 118         else
 119                 X86EMU_prepareForInt(intno);
 120 }
 121
 122 /* Result codes returned by the PCI BIOS */
 123
 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
 131
 132 /****************************************************************************
 133 PARAMETERS:
 134 intno   - Interrupt number being serviced
 135
 136 REMARKS:
 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
 144 case).
 145 ****************************************************************************/
 146 static void X86API int1A(int unused)
 147 {
 148         u16 pciSlot;
 149
 150 #ifdef __KERNEL__
 151         u8 interface, subclass, baseclass;
 152
 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;
 156 #else
 157 /* Fail if no PCI device information has been registered */
 158         if (!_BE_env.vgaInfo.pciInfo)
 159                 return;
 160
 161         pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
 162 #endif
 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 */
 169                 CLEAR_FLAG(F_CF);
 170                 break;
 171         case 0xB102:            /* Find PCI device */
 172                 M.x86.R_AH = DEVICE_NOT_FOUND;
 173 #ifdef __KERNEL__
 174                 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
 175                     M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
 176 #else
 177                 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
 178                     M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
 179                     M.x86.R_SI == 0) {
 180 #endif
 181                         M.x86.R_AH = SUCCESSFUL;
 182                         M.x86.R_BX = pciSlot;
 183                 }
 184                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 185                 break;
 186         case 0xB103:            /* Find PCI class code */
 187                 M.x86.R_AH = DEVICE_NOT_FOUND;
 188 #ifdef __KERNEL__
 189                 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
 190                                      &interface);
 191                 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
 192                                      &subclass);
 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) {
 197 #else
 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) {
 202 #endif
 203                         M.x86.R_AH = SUCCESSFUL;
 204                         M.x86.R_BX = pciSlot;
 205                 }
 206                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 207                 break;
 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;
 212 #ifdef __KERNEL__
 213                         pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 214                                              &M.x86.R_CL);
 215 #else
 216                         M.x86.R_CL =
 217                             (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
 218                                                _BE_env.vgaInfo.pciInfo);
 219 #endif
 220                 }
 221                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 222                 break;
 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;
 227 #ifdef __KERNEL__
 228                         pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 229                                              &M.x86.R_CX);
 230 #else
 231                         M.x86.R_CX =
 232                             (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
 233                                                 _BE_env.vgaInfo.pciInfo);
 234 #endif
 235                 }
 236                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 237                 break;
 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;
 242 #ifdef __KERNEL__
 243                         pci_read_config_dword(_BE_env.vgaInfo.pcidev,
 244                                               M.x86.R_DI, &M.x86.R_ECX);
 245 #else
 246                         M.x86.R_ECX =
 247                             (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
 248                                                 _BE_env.vgaInfo.pciInfo);
 249 #endif
 250                 }
 251                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 252                 break;
 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;
 257 #ifdef __KERNEL__
 258                         pci_write_config_byte(_BE_env.vgaInfo.pcidev,
 259                                               M.x86.R_DI, M.x86.R_CL);
 260 #else
 261                         PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
 262                                       _BE_env.vgaInfo.pciInfo);
 263 #endif
 264                 }
 265                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 266                 break;
 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;
 271 #ifdef __KERNEL__
 272                         pci_write_config_word(_BE_env.vgaInfo.pcidev,
 273                                               M.x86.R_DI, M.x86.R_CX);
 274 #else
 275                         PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
 276                                       _BE_env.vgaInfo.pciInfo);
 277 #endif
 278                 }
 279                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 280                 break;
 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;
 285 #ifdef __KERNEL__
 286                         pci_write_config_dword(_BE_env.vgaInfo.pcidev,
 287                                                M.x86.R_DI, M.x86.R_ECX);
 288 #else
 289                         PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
 290                                       _BE_env.vgaInfo.pciInfo);
 291 #endif
 292                 }
 293                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 294                 break;
 295         default:
 296                 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
 297                        M.x86.R_AX);
 298         }
 299 }
 300
 301 /****************************************************************************
 302 REMARKS:
 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))
 310
 311 void _BE_bios_init(u32 * intrTab)
 312 {
 313         int i;
 314         X86EMU_intrFuncs bios_intr_tab[256];
 315
 316         for (i = 0; i < 256; ++i) {
 317                 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
 318                 bios_intr_tab[i] = undefined_intr;
 319         }
 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);
 325 }
 326 #endif