/*
 * COPYRIGHT:       GPL - See COPYING in the top level directory
 * PROJECT:         386/486 CPU Emulation Library
 * FILE:            common.h
 * PURPOSE:         Common functions used internally by Soft386 (header file).
 * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
 */

#ifndef _COMMON_H_
#define _COMMON_H_

/* DEFINES ********************************************************************/

#ifndef FASTCALL
#define FASTCALL __fastcall
#endif

#define SIGN_FLAG_BYTE  0x80
#define SIGN_FLAG_WORD  0x8000
#define SIGN_FLAG_LONG  0x80000000

#define GET_SEGMENT_RPL(s)          ((s) & 3)
#define GET_SEGMENT_INDEX(s)        ((s) & 0xFFF8)
#define EXCEPTION_HAS_ERROR_CODE(x) (((x) == 8) || ((x) >= 10 && (x) <= 14))

#define PAGE_ALIGN(x)   ((x) & 0xFFFFF000)
#define PAGE_OFFSET(x)  ((x) & 0x00000FFF)

#ifndef PAGE_SIZE
#define PAGE_SIZE   4096
#endif

typedef struct _SOFT386_MOD_REG_RM
{
    SOFT386_GEN_REGS Register;
    BOOLEAN Memory;
    union
    {
        SOFT386_GEN_REGS SecondRegister;
        ULONG MemoryAddress;
    };
} SOFT386_MOD_REG_RM, *PSOFT386_MOD_REG_RM;

#pragma pack(push, 1)

typedef union _SOFT386_PAGE_DIR
{
    struct
    {
        ULONG Present       : 1;
        ULONG Writeable     : 1;
        ULONG Usermode      : 1;
        ULONG WriteThrough  : 1;
        ULONG NoCache       : 1;
        ULONG Accessed      : 1;
        ULONG AlwaysZero    : 1;
        ULONG Size          : 1;
        ULONG Unused        : 4;
        ULONG TableAddress  : 20;
    };
    ULONG Value;
} SOFT386_PAGE_DIR, *PSOFT386_PAGE_DIR;

typedef union _SOFT386_PAGE_TABLE
{
    struct
    {
        ULONG Present       : 1;
        ULONG Writeable     : 1;
        ULONG Usermode      : 1;
        ULONG WriteThrough  : 1;
        ULONG NoCache       : 1;
        ULONG Accessed      : 1;
        ULONG Dirty         : 1;
        ULONG AlwaysZero    : 1;
        ULONG Global        : 1;
        ULONG Unused        : 3;
        ULONG Address       : 20;
    };
    ULONG Value;
} SOFT386_PAGE_TABLE, *PSOFT386_PAGE_TABLE;

#pragma pack(pop)

/* FUNCTIONS ******************************************************************/

BOOLEAN
Soft386ReadMemory
(
    PSOFT386_STATE State,
    SOFT386_SEG_REGS SegmentReg,
    ULONG Offset,
    BOOLEAN InstFetch,
    PVOID Buffer,
    ULONG Size
);

BOOLEAN
Soft386WriteMemory
(
    PSOFT386_STATE State,
    SOFT386_SEG_REGS SegmentReg,
    ULONG Offset,
    PVOID Buffer,
    ULONG Size
);

BOOLEAN
Soft386InterruptInternal
(
    PSOFT386_STATE State,
    USHORT SegmentSelector,
    ULONG Offset,
    BOOLEAN InterruptGate
);

VOID
FASTCALL
Soft386ExceptionWithErrorCode
(
    PSOFT386_STATE State,
    SOFT386_EXCEPTIONS ExceptionCode,
    ULONG ErrorCode
);

/* INLINED FUNCTIONS **********************************************************/

/* static */ FORCEINLINE
INT
Soft386GetCurrentPrivLevel(PSOFT386_STATE State)
{
    return GET_SEGMENT_RPL(State->SegmentRegs[SOFT386_REG_CS].Selector);
}

#include "common.inl"

#endif // _COMMON_H_

/* EOF */