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.
   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 #define __io
  45 #include <common.h>
  46 #include <asm/io.h>
  47 #include "biosemui.h"
  48
  49 /*----------------------------- Implementation ----------------------------*/
  50
  51 /****************************************************************************
  52 PARAMETERS:
  53 intno   - Interrupt number being serviced
  54
  55 REMARKS:
  56 Handler for undefined interrupts.
  57 ****************************************************************************/
  58 static void X86API undefined_intr(int intno)
  59 {
  60         if (BE_rdw(intno * 4 + 2) == BIOS_SEG) {
  61                 DB(printf("biosEmu: undefined interrupt %xh called!\n", intno);)
  62         } else
  63                 X86EMU_prepareForInt(intno);
  64 }
  65
  66 /****************************************************************************
  67 PARAMETERS:
  68 intno   - Interrupt number being serviced
  69
  70 REMARKS:
  71 This function handles the default system BIOS Int 10h (the default is stored
  72 in the Int 42h vector by the system BIOS at bootup). We only need to handle
  73 a small number of special functions used by the BIOS during POST time.
  74 ****************************************************************************/
  75 static void X86API int42(int intno)
  76 {
  77         if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) {
  78                 if (M.x86.R_AL == 0) {
  79                         /* Enable CPU accesses to video memory */
  80                         PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8) 0x02);
  81                         return;
  82                 } else if (M.x86.R_AL == 1) {
  83                         /* Disable CPU accesses to video memory */
  84                         PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8) ~ 0x02);
  85                         return;
  86                 }
  87 #ifdef CONFIG_X86EMU_DEBUG
  88                 else {
  89                         printf("int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",
  90                              M.x86.R_AL);
  91                 }
  92 #endif
  93         }
  94 #ifdef CONFIG_X86EMU_DEBUG
  95         else {
  96                 printf("int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",
  97                      M.x86.R_AH, M.x86.R_AL, M.x86.R_BL);
  98         }
  99 #endif
 100 }
 101
 102 /****************************************************************************
 103 PARAMETERS:
 104 intno   - Interrupt number being serviced
 105
 106 REMARKS:
 107 This function handles the default system BIOS Int 10h. If the POST code
 108 has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
 109 by simply calling the int42 interrupt handler above. Very early in the
 110 BIOS POST process, the vector gets replaced and we simply let the real
 111 mode interrupt handler process the interrupt.
 112 ****************************************************************************/
 113 static void X86API int10(int intno)
 114 {
 115         if (BE_rdw(intno * 4 + 2) == BIOS_SEG)
 116                 int42(intno);
 117         else
 118                 X86EMU_prepareForInt(intno);
 119 }
 120
 121 /* Result codes returned by the PCI BIOS */
 122
 123 #define SUCCESSFUL          0x00
 124 #define FUNC_NOT_SUPPORT    0x81
 125 #define BAD_VENDOR_ID       0x83
 126 #define DEVICE_NOT_FOUND    0x86
 127 #define BAD_REGISTER_NUMBER 0x87
 128 #define SET_FAILED          0x88
 129 #define BUFFER_TOO_SMALL    0x89
 130
 131 /****************************************************************************
 132 PARAMETERS:
 133 intno   - Interrupt number being serviced
 134
 135 REMARKS:
 136 This function handles the default Int 1Ah interrupt handler for the real
 137 mode code, which provides support for the PCI BIOS functions. Since we only
 138 want to allow the real mode BIOS code *only* see the PCI config space for
 139 its own device, we only return information for the specific PCI config
 140 space that we have passed in to the init function. This solves problems
 141 when using the BIOS to warm boot a secondary adapter when there is an
 142 identical adapter before it on the bus (some BIOS'es get confused in this
 143 case).
 144 ****************************************************************************/
 145 static void X86API int1A(int unused)
 146 {
 147         u16 pciSlot;
 148
 149 #ifdef __KERNEL__
 150         u8 interface, subclass, baseclass;
 151
 152         /* Initialise the PCI slot number */
 153         pciSlot = ((int)_BE_env.vgaInfo.bus << 8) |
 154             ((int)_BE_env.vgaInfo.device << 3) | (int)_BE_env.vgaInfo.function;
 155 #else
 156 /* Fail if no PCI device information has been registered */
 157         if (!_BE_env.vgaInfo.pciInfo)
 158                 return;
 159
 160         pciSlot = (u16) (_BE_env.vgaInfo.pciInfo->slot.i >> 8);
 161 #endif
 162         switch (M.x86.R_AX) {
 163         case 0xB101:            /* PCI bios present? */
 164                 M.x86.R_AL = 0x00;      /* no config space/special cycle generation support */
 165                 M.x86.R_EDX = 0x20494350;       /* " ICP" */
 166                 M.x86.R_BX = 0x0210;    /* Version 2.10 */
 167                 M.x86.R_CL = 0; /* Max bus number in system */
 168                 CLEAR_FLAG(F_CF);
 169                 break;
 170         case 0xB102:            /* Find PCI device */
 171                 M.x86.R_AH = DEVICE_NOT_FOUND;
 172 #ifdef __KERNEL__
 173                 if (M.x86.R_DX == _BE_env.vgaInfo.VendorID &&
 174                     M.x86.R_CX == _BE_env.vgaInfo.DeviceID && M.x86.R_SI == 0) {
 175 #else
 176                 if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID &&
 177                     M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID &&
 178                     M.x86.R_SI == 0) {
 179 #endif
 180                         M.x86.R_AH = SUCCESSFUL;
 181                         M.x86.R_BX = pciSlot;
 182                 }
 183                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 184                 break;
 185         case 0xB103:            /* Find PCI class code */
 186                 M.x86.R_AH = DEVICE_NOT_FOUND;
 187 #ifdef __KERNEL__
 188                 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
 189                                      &interface);
 190                 pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
 191                                      &subclass);
 192                 pci_read_config_byte(_BE_env.vgaInfo.pcidev,
 193                                      PCI_CLASS_DEVICE + 1, &baseclass);
 194                 if (M.x86.R_CL == interface && M.x86.R_CH == subclass
 195                     && (u8) (M.x86.R_ECX >> 16) == baseclass) {
 196 #else
 197                 if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
 198                     M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
 199                     (u8) (M.x86.R_ECX >> 16) ==
 200                     _BE_env.vgaInfo.pciInfo->BaseClass) {
 201 #endif
 202                         M.x86.R_AH = SUCCESSFUL;
 203                         M.x86.R_BX = pciSlot;
 204                 }
 205                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 206                 break;
 207         case 0xB108:            /* Read configuration byte */
 208                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 209                 if (M.x86.R_BX == pciSlot) {
 210                         M.x86.R_AH = SUCCESSFUL;
 211 #ifdef __KERNEL__
 212                         pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 213                                              &M.x86.R_CL);
 214 #else
 215                         M.x86.R_CL =
 216                             (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
 217                                                _BE_env.vgaInfo.pciInfo);
 218 #endif
 219                 }
 220                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 221                 break;
 222         case 0xB109:            /* Read configuration word */
 223                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 224                 if (M.x86.R_BX == pciSlot) {
 225                         M.x86.R_AH = SUCCESSFUL;
 226 #ifdef __KERNEL__
 227                         pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 228                                              &M.x86.R_CX);
 229 #else
 230                         M.x86.R_CX =
 231                             (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
 232                                                 _BE_env.vgaInfo.pciInfo);
 233 #endif
 234                 }
 235                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 236                 break;
 237         case 0xB10A:            /* Read configuration dword */
 238                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 239                 if (M.x86.R_BX == pciSlot) {
 240                         M.x86.R_AH = SUCCESSFUL;
 241 #ifdef __KERNEL__
 242                         pci_read_config_dword(_BE_env.vgaInfo.pcidev,
 243                                               M.x86.R_DI, &M.x86.R_ECX);
 244 #else
 245                         M.x86.R_ECX =
 246                             (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
 247                                                 _BE_env.vgaInfo.pciInfo);
 248 #endif
 249                 }
 250                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 251                 break;
 252         case 0xB10B:            /* Write configuration byte */
 253                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 254                 if (M.x86.R_BX == pciSlot) {
 255                         M.x86.R_AH = SUCCESSFUL;
 256 #ifdef __KERNEL__
 257                         pci_write_config_byte(_BE_env.vgaInfo.pcidev,
 258                                               M.x86.R_DI, M.x86.R_CL);
 259 #else
 260                         PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
 261                                       _BE_env.vgaInfo.pciInfo);
 262 #endif
 263                 }
 264                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 265                 break;
 266         case 0xB10C:            /* Write configuration word */
 267                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 268                 if (M.x86.R_BX == pciSlot) {
 269                         M.x86.R_AH = SUCCESSFUL;
 270 #ifdef __KERNEL__
 271                         pci_write_config_word(_BE_env.vgaInfo.pcidev,
 272                                               M.x86.R_DI, M.x86.R_CX);
 273 #else
 274                         PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
 275                                       _BE_env.vgaInfo.pciInfo);
 276 #endif
 277                 }
 278                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 279                 break;
 280         case 0xB10D:            /* Write configuration dword */
 281                 M.x86.R_AH = BAD_REGISTER_NUMBER;
 282                 if (M.x86.R_BX == pciSlot) {
 283                         M.x86.R_AH = SUCCESSFUL;
 284 #ifdef __KERNEL__
 285                         pci_write_config_dword(_BE_env.vgaInfo.pcidev,
 286                                                M.x86.R_DI, M.x86.R_ECX);
 287 #else
 288                         PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
 289                                       _BE_env.vgaInfo.pciInfo);
 290 #endif
 291                 }
 292                 CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 293                 break;
 294         default:
 295                 printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
 296                        M.x86.R_AX);
 297         }
 298 }
 299
 300 /****************************************************************************
 301 REMARKS:
 302 This function initialises the BIOS emulation functions for the specific
 303 PCI display device. We insulate the real mode BIOS from any other devices
 304 on the bus, so that it will work correctly thinking that it is the only
 305 device present on the bus (ie: avoiding any adapters present in from of
 306 the device we are trying to control).
 307 ****************************************************************************/
 308 #define BE_constLE_32(v)    ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))
 309
 310 void _BE_bios_init(u32 * intrTab)
 311 {
 312         int i;
 313         X86EMU_intrFuncs bios_intr_tab[256];
 314
 315         for (i = 0; i < 256; ++i) {
 316                 intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
 317                 bios_intr_tab[i] = undefined_intr;
 318         }
 319         bios_intr_tab[0x10] = int10;
 320         bios_intr_tab[0x1A] = int1A;
 321         bios_intr_tab[0x42] = int42;
 322         bios_intr_tab[0x6D] = int10;
 323         X86EMU_setupIntrFuncs(bios_intr_tab);
 324 }