124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
//
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// Fake Bios support initialization.
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//
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// This file provides interrim support for rom bios services initialization.
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// It is only intended for use until Insignia produces proper rom support
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// for NTVDM
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//
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#include <windows.h>
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#include <stdio.h>
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#include <conio.h>
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#include <string.h>
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#include "softpc.h"
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#include "bop.h"
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#include "xguest.h"
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#include "xbios.h"
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#include "xbiosdsk.h"
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#include "fun.h"
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#define SERVICE_LENGTH 4
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static BYTE ServiceRoutine[] = { 0xC4 , 0xC4, BOP_UNIMPINT, 0xCF };
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#define RESET_LENGTH 16
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static BYTE ResetRoutine[] = { 0xEA, 0x00, 0x00, 0x00, 0xE0, // jmpf E000:0
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BIOSDATE_MINE,
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0, 0xFE, 0 };
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static BYTE WarmBoot[] = {
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OPX_MOVAX, BYTESOFFSET(0x30),
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OPX_MOV2SEG, MODREGRM(MOD_REGISTER,REG_SS,REG_AX),
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OPX_MOVSP, BYTESOFFSET(0x100),
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OPX_MOVAX, 0x00, 0x00,
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OPX_MOV2SEG, MODREGRM(MOD_REGISTER,REG_DS,REG_AX),
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OPX_MOV2SEG, MODREGRM(MOD_REGISTER,REG_ES,REG_AX),
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OPX_MOVDX, DRIVE_FD0, 0x00, // WARNING: sync with BIOSBOOT_DRIVE
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OPX_MOVCX, 0x01, 0x00,
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OPX_MOVBX, BYTESOFFSET(BIOSDATA_BOOT),
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OPX_MOVAX, 0x01, DSKFUNC_READSECTORS,
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OPX_INT, BIOSINT_DSK,
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OPX_JB, -7,
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OPX_JMPF, BYTESCOMPOSITE(0, BIOSDATA_BOOT)
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};
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#define WARMBOOT_LENGTH sizeof(WarmBoot)
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static BYTE EquipmentRoutine[] = { // INT 11h code
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OPX_PUSHDS,
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OPX_MOVAX, 0x00, 0x00,
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OPX_MOV2SEG, MODREGRM(MOD_REGISTER,REG_DS,REG_AX),
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OPX_MOVAXOFF, BYTESOFFSET(BIOSDATA_EQUIP_FLAG),
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OPX_POPDS,
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OPX_IRET
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};
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#define EQUIPMENT_LENGTH sizeof(EquipmentRoutine)
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static BYTE MemoryRoutine[] = { // INT 12h code
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OPX_PUSHDS,
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OPX_MOVAX, 0x00, 0x00,
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OPX_MOV2SEG, MODREGRM(MOD_REGISTER,REG_DS,REG_AX),
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OPX_MOVAXOFF, BYTESOFFSET(BIOSDATA_MEMORY_SIZE),
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OPX_POPDS,
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OPX_IRET
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};
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#define MEMORY_LENGTH sizeof(MemoryRoutine)
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VOID BiosInit(int argc, char *argv[]) {
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PVOID Address, RomAddress;
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// set up IVT with unimplemented interrupt handler
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for (Address = NULL; Address < (PVOID)(0x1D * 4); (PCHAR)Address += 4) {
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*(PWORD)Address = 0x100;
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*(((PWORD)Address) + 1) = 0xF000;
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}
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RomAddress = (PVOID)(0xE000 << 4);
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// set up warm boot handler
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memcpy(RomAddress, WarmBoot, WARMBOOT_LENGTH);
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Address = RMSEGOFFTOLIN(0, BIOSINT_WBOOT * 4);
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*((PWORD)Address) = 0;
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*((PWORD)Address + 1) = 0xE000;
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(PCHAR)RomAddress += WARMBOOT_LENGTH;
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// set up equipment interrupt handler
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memcpy(RomAddress, EquipmentRoutine, EQUIPMENT_LENGTH);
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Address = RMSEGOFFTOLIN(0, BIOSINT_EQUIP * 4);
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*((PWORD)Address) = RMOFF(RomAddress);
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*((PWORD)Address + 1) = RMSEG(RomAddress);
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(PCHAR)RomAddress += EQUIPMENT_LENGTH;
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// set up memory size interrupt handler
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memcpy(RomAddress, MemoryRoutine, MEMORY_LENGTH);
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Address = RMSEGOFFTOLIN(0, BIOSINT_MEMORY * 4);
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*((PWORD)Address) = RMOFF(RomAddress);
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*((PWORD)Address + 1) = RMSEG(RomAddress);
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RomAddress = (PVOID)((0xF000 << 4) + 0x100);
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Address = (PBYTE)RomAddress + 0xFE53;
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*(PCHAR)Address = 0xCF; // IRET at f000:ff53
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// set up unimplemented interrupt handler
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memcpy(RomAddress, ServiceRoutine, SERVICE_LENGTH);
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(PCHAR)RomAddress += SERVICE_LENGTH;
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// set up reset code
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memcpy(RMSEGOFFTOLIN(BIOSROM_SEG, BIOSROM_RESET), ResetRoutine, RESET_LENGTH);
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// set up equipment byte and memory size
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*(PWORD)RMSEGOFFTOLIN(BIOSDATA_SEG, BIOSDATA_EQUIP_FLAG) =
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BIOSEQUIP_32KPLANAR;
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*(PWORD)RMSEGOFFTOLIN(BIOSDATA_SEG, BIOSDATA_MEMORY_SIZE) =
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640;
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// Initialize individual rom modules
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BiosKbdInit(argc, argv, &RomAddress);
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BiosVidInit(argc, argv, &RomAddress);
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}
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