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