LXR uboot/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/****************************************************************************
  52PARAMETERS:
  53intno   - Interrupt number being serviced
  54
  55REMARKS:
  56Handler for undefined interrupts.
  57****************************************************************************/
  58static 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/****************************************************************************
  67PARAMETERS:
  68intno   - Interrupt number being serviced
  69
  70REMARKS:
  71This function handles the default system BIOS Int 10h (the default is stored
  72in the Int 42h vector by the system BIOS at bootup). We only need to handle
  73a small number of special functions used by the BIOS during POST time.
  74****************************************************************************/
  75static 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/****************************************************************************
 103PARAMETERS:
 104intno   - Interrupt number being serviced
 105
 106REMARKS:
 107This function handles the default system BIOS Int 10h. If the POST code
 108has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this
 109by simply calling the int42 interrupt handler above. Very early in the
 110BIOS POST process, the vector gets replaced and we simply let the real
 111mode interrupt handler process the interrupt.
 112****************************************************************************/
 113static 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/****************************************************************************
 132PARAMETERS:
 133intno   - Interrupt number being serviced
 134
 135REMARKS:
 136This function handles the default Int 1Ah interrupt handler for the real
 137mode code, which provides support for the PCI BIOS functions. Since we only
 138want to allow the real mode BIOS code *only* see the PCI config space for
 139its own device, we only return information for the specific PCI config
 140space that we have passed in to the init function. This solves problems
 141when using the BIOS to warm boot a secondary adapter when there is an
 142identical adapter before it on the bus (some BIOS'es get confused in this
 143case).
 144****************************************************************************/
 145static 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#ifdef CONFIG_DM_PCI
 189                dm_pci_read_config8(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
 190                                    &interface);
 191                dm_pci_read_config8(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
 192                                    &subclass);
 193                dm_pci_read_config8(_BE_env.vgaInfo.pcidev,
 194                                    PCI_CLASS_DEVICE + 1, &baseclass);
 195#else
 196                pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_PROG,
 197                                     &interface);
 198                pci_read_config_byte(_BE_env.vgaInfo.pcidev, PCI_CLASS_DEVICE,
 199                                     &subclass);
 200                pci_read_config_byte(_BE_env.vgaInfo.pcidev,
 201                                     PCI_CLASS_DEVICE + 1, &baseclass);
 202#endif
 203                if (M.x86.R_CL == interface && M.x86.R_CH == subclass
 204                    && (u8) (M.x86.R_ECX >> 16) == baseclass) {
 205#else
 206                if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface &&
 207                    M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass &&
 208                    (u8) (M.x86.R_ECX >> 16) ==
 209                    _BE_env.vgaInfo.pciInfo->BaseClass) {
 210#endif
 211                        M.x86.R_AH = SUCCESSFUL;
 212                        M.x86.R_BX = pciSlot;
 213                }
 214                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 215                break;
 216        case 0xB108:            /* Read configuration byte */
 217                M.x86.R_AH = BAD_REGISTER_NUMBER;
 218                if (M.x86.R_BX == pciSlot) {
 219                        M.x86.R_AH = SUCCESSFUL;
 220#ifdef __KERNEL__
 221# ifdef CONFIG_DM_PCI
 222                        dm_pci_read_config8(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 223                                            &M.x86.R_CL);
 224# else
 225                        pci_read_config_byte(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 226                                             &M.x86.R_CL);
 227# endif
 228#else
 229                        M.x86.R_CL =
 230                            (u8) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_BYTE,
 231                                               _BE_env.vgaInfo.pciInfo);
 232#endif
 233                }
 234                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 235                break;
 236        case 0xB109:            /* Read configuration word */
 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# ifdef CONFIG_DM_PCI
 242                        dm_pci_read_config16(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 243                                             &M.x86.R_CX);
 244# else
 245                        pci_read_config_word(_BE_env.vgaInfo.pcidev, M.x86.R_DI,
 246                                             &M.x86.R_CX);
 247# endif
 248#else
 249                        M.x86.R_CX =
 250                            (u16) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_WORD,
 251                                                _BE_env.vgaInfo.pciInfo);
 252#endif
 253                }
 254                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 255                break;
 256        case 0xB10A:            /* Read configuration dword */
 257                M.x86.R_AH = BAD_REGISTER_NUMBER;
 258                if (M.x86.R_BX == pciSlot) {
 259                        M.x86.R_AH = SUCCESSFUL;
 260#ifdef __KERNEL__
 261# ifdef CONFIG_DM_PCI
 262                        dm_pci_read_config32(_BE_env.vgaInfo.pcidev,
 263                                             M.x86.R_DI, &M.x86.R_ECX);
 264# else
 265                        pci_read_config_dword(_BE_env.vgaInfo.pcidev,
 266                                              M.x86.R_DI, &M.x86.R_ECX);
 267# endif
 268#else
 269                        M.x86.R_ECX =
 270                            (u32) PCI_accessReg(M.x86.R_DI, 0, PCI_READ_DWORD,
 271                                                _BE_env.vgaInfo.pciInfo);
 272#endif
 273                }
 274                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 275                break;
 276        case 0xB10B:            /* Write configuration byte */
 277                M.x86.R_AH = BAD_REGISTER_NUMBER;
 278                if (M.x86.R_BX == pciSlot) {
 279                        M.x86.R_AH = SUCCESSFUL;
 280#ifdef __KERNEL__
 281# ifdef CONFIG_DM_PCI
 282                        dm_pci_write_config8(_BE_env.vgaInfo.pcidev,
 283                                             M.x86.R_DI, M.x86.R_CL);
 284# else
 285                        pci_write_config_byte(_BE_env.vgaInfo.pcidev,
 286                                              M.x86.R_DI, M.x86.R_CL);
 287# endif
 288#else
 289                        PCI_accessReg(M.x86.R_DI, M.x86.R_CL, PCI_WRITE_BYTE,
 290                                      _BE_env.vgaInfo.pciInfo);
 291#endif
 292                }
 293                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 294                break;
 295        case 0xB10C:            /* Write configuration word */
 296                M.x86.R_AH = BAD_REGISTER_NUMBER;
 297                if (M.x86.R_BX == pciSlot) {
 298                        M.x86.R_AH = SUCCESSFUL;
 299#ifdef __KERNEL__
 300# ifdef CONFIG_DM_PCI
 301                        dm_pci_write_config32(_BE_env.vgaInfo.pcidev,
 302                                              M.x86.R_DI, M.x86.R_CX);
 303# else
 304                        pci_write_config_word(_BE_env.vgaInfo.pcidev,
 305                                              M.x86.R_DI, M.x86.R_CX);
 306# endif
 307#else
 308                        PCI_accessReg(M.x86.R_DI, M.x86.R_CX, PCI_WRITE_WORD,
 309                                      _BE_env.vgaInfo.pciInfo);
 310#endif
 311                }
 312                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 313                break;
 314        case 0xB10D:            /* Write configuration dword */
 315                M.x86.R_AH = BAD_REGISTER_NUMBER;
 316                if (M.x86.R_BX == pciSlot) {
 317                        M.x86.R_AH = SUCCESSFUL;
 318#ifdef __KERNEL__
 319# ifdef CONFIG_DM_PCI
 320                        dm_pci_write_config32(_BE_env.vgaInfo.pcidev,
 321                                              M.x86.R_DI, M.x86.R_ECX);
 322# else
 323                        pci_write_config_dword(_BE_env.vgaInfo.pcidev,
 324                                               M.x86.R_DI, M.x86.R_ECX);
 325# endif
 326#else
 327                        PCI_accessReg(M.x86.R_DI, M.x86.R_ECX, PCI_WRITE_DWORD,
 328                                      _BE_env.vgaInfo.pciInfo);
 329#endif
 330                }
 331                CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF);
 332                break;
 333        default:
 334                printf("biosEmu/bios.int1a: unknown function AX=%#04x\n",
 335                       M.x86.R_AX);
 336        }
 337}
 338
 339/****************************************************************************
 340REMARKS:
 341This function initialises the BIOS emulation functions for the specific
 342PCI display device. We insulate the real mode BIOS from any other devices
 343on the bus, so that it will work correctly thinking that it is the only
 344device present on the bus (ie: avoiding any adapters present in from of
 345the device we are trying to control).
 346****************************************************************************/
 347#define BE_constLE_32(v)    ((((((v)&0xff00)>>8)|(((v)&0xff)<<8))<<16)|(((((v)&0xff000000)>>8)|(((v)&0x00ff0000)<<8))>>16))
 348
 349void _BE_bios_init(u32 * intrTab)
 350{
 351        int i;
 352        X86EMU_intrFuncs bios_intr_tab[256];
 353
 354        for (i = 0; i < 256; ++i) {
 355                intrTab[i] = BE_constLE_32(BIOS_SEG << 16);
 356                bios_intr_tab[i] = undefined_intr;
 357        }
 358        bios_intr_tab[0x10] = int10;
 359        bios_intr_tab[0x1A] = int1A;
 360        bios_intr_tab[0x42] = int42;
 361        bios_intr_tab[0x6D] = int10;
 362        X86EMU_setupIntrFuncs(bios_intr_tab);
 363}
 364