| /**************************************************************************** |
| * |
| * BIOS emulator and interface |
| * to Realmode X86 Emulator Library |
| * |
| * Copyright (C) 1996-1999 SciTech Software, Inc. |
| * |
| * ======================================================================== |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and |
| * its documentation for any purpose is hereby granted without fee, |
| * provided that the above copyright notice appear in all copies and that |
| * both that copyright notice and this permission notice appear in |
| * supporting documentation, and that the name of the authors not be used |
| * in advertising or publicity pertaining to distribution of the software |
| * without specific, written prior permission. The authors makes no |
| * representations about the suitability of this software for any purpose. |
| * It is provided "as is" without express or implied warranty. |
| * |
| * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
| * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
| * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| * |
| * ======================================================================== |
| * |
| * Language: ANSI C |
| * Environment: Any |
| * Developer: Kendall Bennett |
| * |
| * Description: Module implementing the BIOS specific functions. |
| * |
| ****************************************************************************/ |
| |
| #include "biosemui.h" |
| |
| /*----------------------------- Implementation ----------------------------*/ |
| |
| /**************************************************************************** |
| PARAMETERS: |
| intno - Interrupt number being serviced |
| |
| REMARKS: |
| Handler for undefined interrupts. |
| ****************************************************************************/ |
| static void X86API undefined_intr( |
| int intno) |
| { |
| if (BE_rdw(intno * 4 + 2) == BIOS_SEG) |
| printk("biosEmu: undefined interrupt %xh called!\n",intno); |
| else |
| X86EMU_prepareForInt(intno); |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| intno - Interrupt number being serviced |
| |
| REMARKS: |
| This function handles the default system BIOS Int 10h (the default is stored |
| in the Int 42h vector by the system BIOS at bootup). We only need to handle |
| a small number of special functions used by the BIOS during POST time. |
| ****************************************************************************/ |
| static void X86API int42( |
| int intno) |
| { |
| if (M.x86.R_AH == 0x12 && M.x86.R_BL == 0x32) { |
| if (M.x86.R_AL == 0) { |
| /* Enable CPU accesses to video memory */ |
| PM_outpb(0x3c2, PM_inpb(0x3cc) | (u8)0x02); |
| return; |
| } |
| else if (M.x86.R_AL == 1) { |
| /* Disable CPU accesses to video memory */ |
| PM_outpb(0x3c2, PM_inpb(0x3cc) & (u8)~0x02); |
| return; |
| } |
| #ifdef DEBUG |
| else { |
| printk("biosEmu/bios.int42: unknown function AH=0x12, BL=0x32, AL=%#02x\n",M.x86.R_AL); |
| } |
| #endif |
| } |
| #ifdef DEBUG |
| else { |
| printk("biosEmu/bios.int42: unknown function AH=%#02x, AL=%#02x, BL=%#02x\n",M.x86.R_AH, M.x86.R_AL, M.x86.R_BL); |
| } |
| #endif |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| intno - Interrupt number being serviced |
| |
| REMARKS: |
| This function handles the default system BIOS Int 10h. If the POST code |
| has not yet re-vectored the Int 10h BIOS interrupt vector, we handle this |
| by simply calling the int42 interrupt handler above. Very early in the |
| BIOS POST process, the vector gets replaced and we simply let the real |
| mode interrupt handler process the interrupt. |
| ****************************************************************************/ |
| static void X86API int10( |
| int intno) |
| { |
| if (BE_rdw(intno * 4 + 2) == BIOS_SEG) |
| int42(intno); |
| else |
| X86EMU_prepareForInt(intno); |
| } |
| |
| /* Result codes returned by the PCI BIOS */ |
| |
| #define SUCCESSFUL 0x00 |
| #define FUNC_NOT_SUPPORT 0x81 |
| #define BAD_VENDOR_ID 0x83 |
| #define DEVICE_NOT_FOUND 0x86 |
| #define BAD_REGISTER_NUMBER 0x87 |
| #define SET_FAILED 0x88 |
| #define BUFFER_TOO_SMALL 0x89 |
| |
| /**************************************************************************** |
| PARAMETERS: |
| intno - Interrupt number being serviced |
| |
| REMARKS: |
| This function handles the default Int 1Ah interrupt handler for the real |
| mode code, which provides support for the PCI BIOS functions. Since we only |
| want to allow the real mode BIOS code *only* see the PCI config space for |
| its own device, we only return information for the specific PCI config |
| space that we have passed in to the init function. This solves problems |
| when using the BIOS to warm boot a secondary adapter when there is an |
| identical adapter before it on the bus (some BIOS'es get confused in this |
| case). |
| ****************************************************************************/ |
| static void X86API int1A( |
| unused) |
| { |
| u16 pciSlot; |
| |
| /* Fail if no PCI device information has been registered */ |
| if (!_BE_env.vgaInfo.pciInfo) |
| return; |
| pciSlot = (u16)(_BE_env.vgaInfo.pciInfo->slot.i >> 8); |
| switch (M.x86.R_AX) { |
| case 0xB101: /* PCI bios present? */ |
| M.x86.R_AL = 0x00; /* no config space/special cycle generation support */ |
| M.x86.R_EDX = 0x20494350; /* " ICP" */ |
| M.x86.R_BX = 0x0210; /* Version 2.10 */ |
| M.x86.R_CL = 0; /* Max bus number in system */ |
| CLEAR_FLAG(F_CF); |
| break; |
| case 0xB102: /* Find PCI device */ |
| M.x86.R_AH = DEVICE_NOT_FOUND; |
| if (M.x86.R_DX == _BE_env.vgaInfo.pciInfo->VendorID && |
| M.x86.R_CX == _BE_env.vgaInfo.pciInfo->DeviceID && |
| M.x86.R_SI == 0) { |
| M.x86.R_AH = SUCCESSFUL; |
| M.x86.R_BX = pciSlot; |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB103: /* Find PCI class code */ |
| M.x86.R_AH = DEVICE_NOT_FOUND; |
| if (M.x86.R_CL == _BE_env.vgaInfo.pciInfo->Interface && |
| M.x86.R_CH == _BE_env.vgaInfo.pciInfo->SubClass && |
| (u8)(M.x86.R_ECX >> 16) == _BE_env.vgaInfo.pciInfo->BaseClass) { |
| M.x86.R_AH = SUCCESSFUL; |
| M.x86.R_BX = pciSlot; |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB108: /* Read configuration byte */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| M.x86.R_CL = (u8)PCI_accessReg(M.x86.R_DI,0,PCI_READ_BYTE,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB109: /* Read configuration word */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| M.x86.R_CX = (u16)PCI_accessReg(M.x86.R_DI,0,PCI_READ_WORD,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB10A: /* Read configuration dword */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| M.x86.R_ECX = (u32)PCI_accessReg(M.x86.R_DI,0,PCI_READ_DWORD,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB10B: /* Write configuration byte */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| PCI_accessReg(M.x86.R_DI,M.x86.R_CL,PCI_WRITE_BYTE,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB10C: /* Write configuration word */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| PCI_accessReg(M.x86.R_DI,M.x86.R_CX,PCI_WRITE_WORD,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| case 0xB10D: /* Write configuration dword */ |
| M.x86.R_AH = BAD_REGISTER_NUMBER; |
| if (M.x86.R_BX == pciSlot) { |
| M.x86.R_AH = SUCCESSFUL; |
| PCI_accessReg(M.x86.R_DI,M.x86.R_ECX,PCI_WRITE_DWORD,_BE_env.vgaInfo.pciInfo); |
| } |
| CONDITIONAL_SET_FLAG((M.x86.R_AH != SUCCESSFUL), F_CF); |
| break; |
| default: |
| printk("biosEmu/bios.int1a: unknown function AX=%#04x\n", M.x86.R_AX); |
| } |
| } |
| |
| /**************************************************************************** |
| REMARKS: |
| This function initialises the BIOS emulation functions for the specific |
| PCI display device. We insulate the real mode BIOS from any other devices |
| on the bus, so that it will work correctly thinking that it is the only |
| device present on the bus (ie: avoiding any adapters present in from of |
| the device we are trying to control). |
| ****************************************************************************/ |
| void _BE_bios_init( |
| u32 *intrTab) |
| { |
| int i; |
| X86EMU_intrFuncs bios_intr_tab[256]; |
| |
| for (i = 0; i < 256; ++i) { |
| intrTab[i] = BIOS_SEG << 16; |
| bios_intr_tab[i] = undefined_intr; |
| } |
| bios_intr_tab[0x10] = int10; |
| bios_intr_tab[0x1A] = int1A; |
| bios_intr_tab[0x42] = int42; |
| X86EMU_setupIntrFuncs(bios_intr_tab); |
| } |
