mirror of
https://github.com/reactos/reactos.git
synced 2024-09-18 08:42:34 +00:00
144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: bios.c
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* PURPOSE: VDM BIOS Support Library
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* PROGRAMMERS: Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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/* INCLUDES *******************************************************************/
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#define NDEBUG
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#include "emulator.h"
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#include "cpu/callback.h"
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#include "cpu/bop.h"
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#include "bios.h"
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#include "bios32/bios32.h"
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#include "rom.h"
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#include "io.h"
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#include "hardware/cmos.h"
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/* DEFINES ********************************************************************/
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/* BOP Identifiers */
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#define BOP_RESET 0x00 // Windows NTVDM (SoftPC) BIOS calls BOP 0x00
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// to let the virtual machine initialize itself
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// the IVT and its hardware.
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#define BOP_EQUIPLIST 0x11
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#define BOP_GETMEMSIZE 0x12
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/* PRIVATE VARIABLES **********************************************************/
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static BOOLEAN Bios32Loaded = FALSE;
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PBIOS_DATA_AREA Bda;
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PBIOS_CONFIG_TABLE Bct;
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/* PRIVATE FUNCTIONS **********************************************************/
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/* PUBLIC FUNCTIONS ***********************************************************/
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VOID WINAPI BiosEquipmentService(LPWORD Stack)
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{
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/* Return the equipment list */
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setAX(Bda->EquipmentList);
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}
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VOID WINAPI BiosGetMemorySize(LPWORD Stack)
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{
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/* Return the conventional memory size in kB, typically 640 kB */
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setAX(Bda->MemorySize);
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}
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BOOLEAN
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BiosInitialize(IN LPCSTR BiosFileName)
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{
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BOOLEAN Success = FALSE;
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/* Disable interrupts */
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setIF(0);
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/* Initialize the BDA and the BCT pointers */
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Bda = (PBIOS_DATA_AREA)SEG_OFF_TO_PTR(BDA_SEGMENT, 0x0000);
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// The BCT is found at F000:E6F5 for 100% compatible BIOSes.
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Bct = (PBIOS_CONFIG_TABLE)SEG_OFF_TO_PTR(BIOS_SEGMENT, 0xE6F5);
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/**** HACK! HACK! for Windows NTVDM BIOS ****/
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// WinNtVdmBiosSupportInitialize();
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// /* Register the BIOS support BOPs */
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// RegisterBop(BOP_EQUIPLIST , BiosEquipmentService);
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// RegisterBop(BOP_GETMEMSIZE, BiosGetMemorySize);
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if (BiosFileName && BiosFileName[0] != '\0')
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{
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PVOID BiosLocation = NULL;
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DWORD BiosSize = 0;
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Success = LoadBios(BiosFileName, &BiosLocation, &BiosSize);
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DPRINT1("BIOS loading %s ; GetLastError() = %u\n", Success ? "succeeded" : "failed", GetLastError());
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if (!Success) return FALSE;
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DisplayMessage(L"First bytes at 0x%p: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n"
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L"3 last bytes at 0x%p: 0x%02x 0x%02x 0x%02x",
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BiosLocation,
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 0),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 1),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 2),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 3),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 4),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 5),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 6),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 7),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 8),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + 9),
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(PVOID)((ULONG_PTR)BiosLocation + BiosSize - 2),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + BiosSize - 2),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + BiosSize - 1),
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*(PCHAR)((ULONG_PTR)REAL_TO_PHYS(BiosLocation) + BiosSize - 0));
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DisplayMessage(L"POST at 0x%p: 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x",
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TO_LINEAR(getCS(), getIP()),
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*(PCHAR)((ULONG_PTR)SEG_OFF_TO_PTR(getCS(), getIP()) + 0),
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*(PCHAR)((ULONG_PTR)SEG_OFF_TO_PTR(getCS(), getIP()) + 1),
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*(PCHAR)((ULONG_PTR)SEG_OFF_TO_PTR(getCS(), getIP()) + 2),
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*(PCHAR)((ULONG_PTR)SEG_OFF_TO_PTR(getCS(), getIP()) + 3),
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*(PCHAR)((ULONG_PTR)SEG_OFF_TO_PTR(getCS(), getIP()) + 4));
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/* Boot it up */
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/*
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* The CPU is already in reset-mode so that
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* CS:IP points to F000:FFF0 as required.
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*/
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DisplayMessage(L"CS=0x%p ; IP=0x%p", getCS(), getIP());
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// setCS(0xF000);
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// setIP(0xFFF0);
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Success = TRUE;
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}
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else
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{
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Success = Bios32Loaded = Bios32Initialize();
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}
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// /* Enable interrupts */
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// setIF(1);
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return Success;
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}
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VOID
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BiosCleanup(VOID)
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{
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if (Bios32Loaded) Bios32Cleanup();
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}
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/* EOF */
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