mirror of
https://github.com/reactos/reactos.git
synced 2024-10-22 22:09:47 +00:00
59e28c4f15
Fix jump conditions. [NTVDM] Implement BIOS teletype output command. Start implementation of a new CPU emulator to replace softx86. svn path=/branches/ntvdm/; revision=59450
186 lines
4.7 KiB
C
186 lines
4.7 KiB
C
/*
|
|
* COPYRIGHT: GPL - See COPYING in the top level directory
|
|
* PROJECT: ReactOS Virtual DOS Machine
|
|
* FILE: emulator.h
|
|
* PURPOSE: Minimal x86 machine emulator for the VDM (header file)
|
|
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
|
|
*/
|
|
|
|
#ifndef _EMULATOR_H_
|
|
#define _EMULATOR_H_
|
|
|
|
/* INCLUDES *******************************************************************/
|
|
|
|
#include "ntvdm.h"
|
|
|
|
#ifndef NEW_EMULATOR
|
|
#include <softx86/softx86.h>
|
|
#include <softx86/softx87.h>
|
|
#endif
|
|
|
|
/* DEFINES ********************************************************************/
|
|
|
|
/* FLAGS */
|
|
#define EMULATOR_FLAG_CF (1 << 0)
|
|
#define EMULATOR_FLAG_PF (1 << 2)
|
|
#define EMULATOR_FLAG_AF (1 << 4)
|
|
#define EMULATOR_FLAG_ZF (1 << 6)
|
|
#define EMULATOR_FLAG_SF (1 << 7)
|
|
#define EMULATOR_FLAG_TF (1 << 8)
|
|
#define EMULATOR_FLAG_IF (1 << 9)
|
|
#define EMULATOR_FLAG_DF (1 << 10)
|
|
#define EMULATOR_FLAG_OF (1 << 11)
|
|
#define EMULATOR_FLAG_NT (1 << 14)
|
|
#define EMULATOR_FLAG_RF (1 << 16)
|
|
#define EMULATOR_FLAG_VM (1 << 17)
|
|
#define EMULATOR_FLAG_AC (1 << 18)
|
|
#define EMULATOR_FLAG_VIF (1 << 19)
|
|
#define EMULATOR_FLAG_VIP (1 << 20)
|
|
#define EMULATOR_FLAG_ID (1 << 21)
|
|
|
|
/* CR0 */
|
|
#define EMULATOR_CR0_PE (1 << 0)
|
|
#define EMULATOR_CR0_MP (1 << 1)
|
|
#define EMULATOR_CR0_EM (1 << 2)
|
|
#define EMULATOR_CR0_TS (1 << 3)
|
|
#define EMULATOR_CR0_ET (1 << 4)
|
|
#define EMULATOR_CR0_NE (1 << 5)
|
|
#define EMULATOR_CR0_WP (1 << 16)
|
|
#define EMULATOR_CR0_AM (1 << 18)
|
|
#define EMULATOR_CR0_NW (1 << 29)
|
|
#define EMULATOR_CR0_CD (1 << 30)
|
|
#define EMULATOR_CR0_PG (1 << 31)
|
|
|
|
/* GDT Access byte */
|
|
#define GDT_SEG_ACCESSED (1 << 0)
|
|
#define GDT_DATA_WRITEABLE (1 << 1)
|
|
#define GDT_CODE_READABLE (1 << 1)
|
|
#define GDT_CONFORMING (1 << 2)
|
|
#define GDT_DIRECTION (1 << 2)
|
|
#define GDT_CODE_SEGMENT (1 << 3)
|
|
#define GDT_PRESENT (1 << 7)
|
|
|
|
/* GDT flags */
|
|
#define GDT_32BIT_SEGMENT (1 << 2)
|
|
#define GDT_PAGE_GRANULARITY (1 << 3)
|
|
|
|
/* Common definitions */
|
|
#define EMULATOR_NUM_GENERAL_REGS 8
|
|
#define EMULATOR_NUM_SEGMENT_REGS 6
|
|
#define EMULATOR_NUM_CONTROL_REGS 8
|
|
#define EMULATOR_NUM_DEBUG_REGS 8
|
|
#define MAX_GDT_ENTRIES 8192
|
|
#define SPECIAL_INT_NUM 0xFF
|
|
|
|
enum
|
|
{
|
|
EMULATOR_EXCEPTION_DIVISION_BY_ZERO,
|
|
EMULATOR_EXCEPTION_DEBUG,
|
|
EMULATOR_EXCEPTION_NMI,
|
|
EMULATOR_EXCEPTION_BREAKPOINT,
|
|
EMULATOR_EXCEPTION_OVERFLOW,
|
|
EMULATOR_EXCEPTION_BOUND,
|
|
EMULATOR_EXCEPTION_INVALID_OPCODE,
|
|
EMULATOR_EXCEPTION_NO_FPU,
|
|
EMULATOR_EXCEPTION_DOUBLE_FAULT,
|
|
EMULATOR_EXCEPTION_FPU_SEGMENT,
|
|
EMULATOR_EXCEPTION_INVALID_TSS,
|
|
EMULATOR_EXCEPTION_NO_SEGMENT,
|
|
EMULATOR_EXCEPTION_STACK_SEGMENT,
|
|
EMULATOR_EXCEPTION_GPF,
|
|
EMULATOR_EXCEPTION_PAGE_FAULT
|
|
};
|
|
|
|
enum
|
|
{
|
|
EMULATOR_REG_AX,
|
|
EMULATOR_REG_CX,
|
|
EMULATOR_REG_DX,
|
|
EMULATOR_REG_BX,
|
|
EMULATOR_REG_SP,
|
|
EMULATOR_REG_BP,
|
|
EMULATOR_REG_SI,
|
|
EMULATOR_REG_DI,
|
|
EMULATOR_REG_ES,
|
|
EMULATOR_REG_CS,
|
|
EMULATOR_REG_SS,
|
|
EMULATOR_REG_DS,
|
|
EMULATOR_REG_FS,
|
|
EMULATOR_REG_GS
|
|
};
|
|
|
|
typedef union
|
|
{
|
|
struct
|
|
{
|
|
BYTE LowByte;
|
|
BYTE HighByte;
|
|
};
|
|
WORD LowWord;
|
|
DWORD Long;
|
|
} EMULATOR_REGISTER, *PEMULATOR_REGISTER;
|
|
|
|
typedef struct
|
|
{
|
|
ULONG Limit : 16;
|
|
ULONG Base : 24;
|
|
ULONG AccessByte : 8;
|
|
ULONG LimitHigh : 4;
|
|
ULONG Flags : 4;
|
|
ULONG BaseHigh : 8;
|
|
} EMULATOR_GDT_ENTRY;
|
|
|
|
typedef struct
|
|
{
|
|
ULONG Offset : 16;
|
|
ULONG Selector : 16;
|
|
ULONG Zero : 8;
|
|
ULONG TypeAndAttributes : 8;
|
|
ULONG OffsetHigh : 16;
|
|
} EMULATOR_IDT_ENTRY;
|
|
|
|
typedef struct
|
|
{
|
|
WORD Size;
|
|
DWORD Address;
|
|
} EMULATOR_TABLE_REGISTER;
|
|
|
|
typedef struct
|
|
{
|
|
EMULATOR_REGISTER Registers[EMULATOR_NUM_GENERAL_REGS
|
|
+ EMULATOR_NUM_SEGMENT_REGS];
|
|
EMULATOR_REGISTER Flags;
|
|
EMULATOR_REGISTER InstructionPointer;
|
|
EMULATOR_REGISTER ControlRegisters[EMULATOR_NUM_CONTROL_REGS];
|
|
EMULATOR_REGISTER DebugRegisters[EMULATOR_NUM_DEBUG_REGS];
|
|
ULONGLONG TimeStampCounter;
|
|
BOOLEAN OperandSizeOverload;
|
|
BOOLEAN AddressSizeOverload;
|
|
EMULATOR_TABLE_REGISTER Gdtr, Idtr;
|
|
EMULATOR_GDT_ENTRY CachedDescriptors[EMULATOR_NUM_SEGMENT_REGS];
|
|
UINT ExceptionCount;
|
|
} EMULATOR_CONTEXT, *PEMULATOR_CONTEXT;
|
|
|
|
typedef VOID (*EMULATOR_OPCODE_HANDLER)(PEMULATOR_CONTEXT Context, BYTE Opcode);
|
|
|
|
/* FUNCTIONS ******************************************************************/
|
|
|
|
BOOLEAN EmulatorInitialize();
|
|
VOID EmulatorSetStack(WORD Segment, WORD Offset);
|
|
VOID EmulatorExecute(WORD Segment, WORD Offset);
|
|
VOID EmulatorInterrupt(BYTE Number);
|
|
VOID EmulatorExternalInterrupt(BYTE Number);
|
|
ULONG EmulatorGetRegister(ULONG Register);
|
|
VOID EmulatorSetRegister(ULONG Register, ULONG Value);
|
|
BOOLEAN EmulatorGetFlag(ULONG Flag);
|
|
VOID EmulatorSetFlag(ULONG Flag);
|
|
VOID EmulatorClearFlag(ULONG Flag);
|
|
VOID EmulatorStep();
|
|
VOID EmulatorCleanup();
|
|
VOID EmulatorSetA20(BOOLEAN Enabled);
|
|
|
|
#endif
|
|
|
|
/* EOF */
|
|
|