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/* $NetBSD: x86emu.h,v 1.1 2007/12/01 20:14:10 joerg Exp $ */
/* $OpenBSD: x86emu.h,v 1.3 2009/06/06 03:45:05 matthieu Exp $ */
/****************************************************************************
*
* Realmode X86 Emulator Library
*
* Copyright (C) 1996-1999 SciTech Software, Inc.
* Copyright (C) David Mosberger-Tang
* Copyright (C) 1999 Egbert Eich
* Copyright (C) 2007 Joerg Sonnenberger
*
* ========================================================================
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the authors not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The authors makes no
* representations about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
****************************************************************************/
#ifndef __X86EMU_X86EMU_H
#define __X86EMU_X86EMU_H
#include <sys/types.h>
#include <sys/endian.h>
#ifdef _KERNEL
#include <sys/systm.h>
#else
#include <setjmp.h>
#endif
/*
* General EAX, EBX, ECX, EDX type registers. Note that for
* portability, and speed, the issue of byte swapping is not addressed
* in the registers. All registers are stored in the default format
* available on the host machine. The only critical issue is that the
* registers should line up EXACTLY in the same manner as they do in
* the 386. That is:
*
* EAX & 0xff === AL
* EAX & 0xffff == AX
*
* etc. The result is that alot of the calculations can then be
* done using the native instruction set fully.
*/
#ifdef __BIG_ENDIAN__
struct x86emu_register32 {
uint32_t e_reg;
};
struct x86emu_register16 {
uint16_t filler0;
uint16_t x_reg;
};
struct x86emu_register8 {
uint8_t filler0, filler1;
uint8_t h_reg, l_reg;
};
#else /* !__BIG_ENDIAN__ */
struct x86emu_register32 {
uint32_t e_reg;
};
struct x86emu_register16 {
uint16_t x_reg;
};
struct x86emu_register8 {
uint8_t l_reg, h_reg;
};
#endif /* BIG_ENDIAN */
union x86emu_register {
struct x86emu_register32 I32_reg;
struct x86emu_register16 I16_reg;
struct x86emu_register8 I8_reg;
};
struct x86emu_regs {
uint16_t register_cs;
uint16_t register_ds;
uint16_t register_es;
uint16_t register_fs;
uint16_t register_gs;
uint16_t register_ss;
uint32_t register_flags;
union x86emu_register register_a;
union x86emu_register register_b;
union x86emu_register register_c;
union x86emu_register register_d;
union x86emu_register register_sp;
union x86emu_register register_bp;
union x86emu_register register_si;
union x86emu_register register_di;
union x86emu_register register_ip;
/*
* MODE contains information on:
* REPE prefix 2 bits repe,repne
* SEGMENT overrides 5 bits normal,DS,SS,CS,ES
* Delayed flag set 3 bits (zero, signed, parity)
* reserved 6 bits
* interrupt # 8 bits instruction raised interrupt
* BIOS video segregs 4 bits
* Interrupt Pending 1 bits
* Extern interrupt 1 bits
* Halted 1 bits
*/
uint32_t mode;
volatile int intr; /* mask of pending interrupts */
uint8_t intno;
uint8_t __pad[3];
};
struct x86emu {
char *mem_base;
size_t mem_size;
void *sys_private;
struct x86emu_regs x86;
#ifdef _KERNEL
label_t exec_state;
#else
jmp_buf exec_state;
#endif
uint64_t cur_cycles;
unsigned int cur_mod:2;
unsigned int cur_rl:3;
unsigned int cur_rh:3;
uint32_t cur_offset;
uint8_t (*emu_rdb)(struct x86emu *, uint32_t addr);
uint16_t (*emu_rdw)(struct x86emu *, uint32_t addr);
uint32_t (*emu_rdl)(struct x86emu *, uint32_t addr);
void (*emu_wrb)(struct x86emu *, uint32_t addr,uint8_t val);
void (*emu_wrw)(struct x86emu *, uint32_t addr, uint16_t val);
void (*emu_wrl)(struct x86emu *, uint32_t addr, uint32_t val);
uint8_t (*emu_inb)(struct x86emu *, uint16_t addr);
uint16_t (*emu_inw)(struct x86emu *, uint16_t addr);
uint32_t (*emu_inl)(struct x86emu *, uint16_t addr);
void (*emu_outb)(struct x86emu *, uint16_t addr, uint8_t val);
void (*emu_outw)(struct x86emu *, uint16_t addr, uint16_t val);
void (*emu_outl)(struct x86emu *, uint16_t addr, uint32_t val);
void (*_x86emu_intrTab[256])(struct x86emu *, int);
};
__BEGIN_DECLS
void x86emu_init_default(struct x86emu *);
/* decode.c */
void x86emu_exec(struct x86emu *);
void x86emu_exec_call(struct x86emu *, uint16_t, uint16_t);
void x86emu_exec_intr(struct x86emu *, uint8_t);
void x86emu_halt_sys(struct x86emu *) __dead;
__END_DECLS
#endif /* __X86EMU_X86EMU_H */
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