/* 
 * All modifications in this file to the original code are
 * (C) Copyright 1992, ..., 2001 the "DOSEMU-Development-Team".
 *
 * for details see file COPYING in the DOSEMU distribution
 */

/* cpu.h, for the Linux DOS emulator
 *    Copyright (C) 1993 Robert Sanders, gt8134b@prism.gatech.edu
 */

#ifndef CPU_H
#define CPU_H

/* pic.h & dpmi.h are just for set_IF() & clear_IF() */
#include "pic.h"
extern int dpmi_eflags;  /* don't include 'dpmi.h' just for this! */
#include "types.h"

#ifdef BIOSSEG
#undef BIOSSEG
#endif
#ifdef __linux__
#include <sys/vm86.h>
#endif
#ifndef BIOSSEG
#define BIOSSEG 0xf000
#endif
#ifdef __linux__
#define _regs vm86s.regs
#endif

#include "extern.h"

/* all registers as a structure */
#ifdef __linux__
#define REGS  vm86s.regs
/* this is used like: REG(eax) = 0xFFFFFFF */
#define REG(reg) (REGS.reg)
#define READ_SEG_REG(reg) (REGS.reg)
#define WRITE_SEG_REG(reg, val) REGS.reg = (val)
#endif


#define _AL      (*(Bit8u *)&vm86s.regs.eax)
#define _BL      (*(Bit8u *)&vm86s.regs.ebx)
#define _CL      (*(Bit8u *)&vm86s.regs.ecx)
#define _DL      (*(Bit8u *)&vm86s.regs.edx)
#define _AH      (*(((Bit8u *)&vm86s.regs.eax)+1))
#define _BH      (*(((Bit8u *)&vm86s.regs.ebx)+1))
#define _CH      (*(((Bit8u *)&vm86s.regs.ecx)+1))
#define _DH      (*(((Bit8u *)&vm86s.regs.edx)+1))
#define _AX      (*(Bit16u *)&vm86s.regs.eax)
#define _BX      (*(Bit16u *)&vm86s.regs.ebx)
#define _CX      (*(Bit16u *)&vm86s.regs.ecx)
#define _DX      (*(Bit16u *)&vm86s.regs.edx)
#define _SI      (*(Bit16u *)&vm86s.regs.esi)
#define _DI      (*(Bit16u *)&vm86s.regs.edi)
#define _BP      (*(Bit16u *)&vm86s.regs.ebp)
#define _SP      (*(Bit16u *)&vm86s.regs.esp)
#define _IP      (*(Bit16u *)&vm86s.regs.eip)
#define _EAX     ((Bit32u)(vm86s.regs.eax))
#define _EBX     ((Bit32u)(vm86s.regs.ebx))
#define _ECX     ((Bit32u)(vm86s.regs.ecx))
#define _EDX     ((Bit32u)(vm86s.regs.edx))
#define _ESI     ((Bit32u)(vm86s.regs.esi))
#define _EDI     ((Bit32u)(vm86s.regs.edi))
#define _EBP     ((Bit32u)(vm86s.regs.ebp))
#define _ESP     ((Bit32u)(vm86s.regs.esp))
#define _EIP     ((Bit32u)(vm86s.regs.eip))
#define _CS      ((Bit16u)(vm86s.regs.cs))
#define _DS      ((Bit16u)(vm86s.regs.ds))
#define _SS      ((Bit16u)(vm86s.regs.ss))
#define _ES      ((Bit16u)(vm86s.regs.es))
#define _FS      ((Bit16u)(vm86s.regs.fs))
#define _GS      ((Bit16u)(vm86s.regs.gs))
#define _EFLAGS  ((Bit32u)(vm86s.regs.eflags))
#define _FLAGS   (*(Bit16u *)&vm86s.regs.eflags)


/* these are used like:  LO(ax) = 2 (sets al to 2) */
#define LO(reg)  (*(unsigned char *)&REG(e##reg))
#define HI(reg)  (*((unsigned char *)&REG(e##reg) + 1))

#define _LO(reg) (*(unsigned char *)&(scp->e##reg))
#define _HI(reg) (*((unsigned char *)&(scp->e##reg) + 1))

/* these are used like: LWORD(eax) = 65535 (sets ax to 65535) */
#define LWORD(reg)	(*((unsigned short *)&REG(reg)))
#define HWORD(reg)	(*((unsigned short *)&REG(reg) + 1))

#define _LWORD(reg)	(*((unsigned short *)&(scp->reg)))
#define _HWORD(reg)	(*((unsigned short *)&(scp->reg) + 1))

/* this is used like: SEG_ADR((char *), es, bx) */
#define SEG_ADR(type, seg, reg)  type((LWORD(seg) << 4) + LWORD(e##reg))

/* alternative SEG:OFF to linear conversion macro */
#define SEGOFF2LINEAR(seg, off)  ((((Bit32u)(seg)) << 4) + (off))

#define WRITE_FLAGS(val)    LWORD(eflags) = (val)
#define WRITE_FLAGSE(val)    REG(eflags) = (val)
#define READ_FLAGS()        LWORD(eflags)
#define READ_FLAGSE()        REG(eflags)

/*
 * nearly directly stolen from Linus : linux/kernel/vm86.c
 *
 * Boy are these ugly, but we need to do the correct 16-bit arithmetic.
 * Gcc makes a mess of it, so we do it inline and use non-obvious calling
 * conventions..
 */
#define pushw(base, ptr, val) \
__asm__ __volatile__( \
	"decw %w0\n\t" \
	"movb %h2,(%1,%0)\n\t" \
	"decw %w0\n\t" \
	"movb %b2,(%1,%0)" \
	: "=r" (ptr) \
	: "r" (base), "q" (val), "0" (ptr))

#define popw(base, ptr) \
({ unsigned long __res; \
__asm__ __volatile__( \
	"movb (%1,%0),%b2\n\t" \
	"incw %w0\n\t" \
	"movb (%1,%0),%h2\n\t" \
	"incw %w0" \
	: "=r" (ptr), "=r" (base), "=q" (__res) \
	: "0" (ptr), "1" (base), "2" (0)); \
__res; })

#define popb(base, ptr) \
({ unsigned long __res; \
__asm__ __volatile__( \
	"movb (%1,%0),%b2\n\t" \
	"incw %w0\n\t" \
	: "=r" (ptr), "=r" (base), "=q" (__res) \
	: "0" (ptr), "1" (base), "2" (0)); \
__res; })

#ifdef __linux__
static __inline__ void set_revectored(int nr, struct revectored_struct * bitmap)
{
	__asm__ __volatile__("btsl %1,%0"
		: /* no output */
		:"m" (*bitmap),"r" (nr));
}

static __inline__ void reset_revectored(int nr, struct revectored_struct * bitmap)
{
	__asm__ __volatile__("btrl %1,%0"
		: /* no output */
		:"m" (*bitmap),"r" (nr));
}
#endif

/* flags */
#define CF  (1 <<  0)
#define PF  (1 <<  2)
#define AF  (1 <<  4)
#define ZF  (1 <<  6)
#define SF  (1 <<  7)
#define TF  TF_MASK	/* (1 <<  8) */
#define IF  IF_MASK	/* (1 <<  9) */
#define DF  (1 << 10)
#define OF  (1 << 11)
#define NT  NT_MASK	/* (1 << 14) */
#define RF  (1 << 16)
#define VM  VM_MASK	/* (1 << 17) */
#define AC  AC_MASK	/* (1 << 18) */
#define VIF VIF_MASK
#define VIP VIP_MASK
#define ID  ID_MASK

#ifndef IOPL_MASK
#define IOPL_MASK  (3 << 12)
#endif

  /* Flag setting and clearing, and testing */
        /* interrupt flag */
#define set_IF() ((_EFLAGS |= (VIF | IF)), (dpmi_eflags |= IF), pic_sti())
#define clear_IF() ((_EFLAGS &= ~(VIF | IF)), (dpmi_eflags &= ~IF), pic_cli())
#define isset_IF() ((_EFLAGS & VIF) != 0)
       /* carry flag */
#define set_CF() (_EFLAGS |= CF)
#define clear_CF() (_EFLAGS &= ~CF)
#define isset_CF() ((_EFLAGS & CF) != 0)
       /* direction flag */
#define set_DF() (_EFLAGS |= DF)
#define clear_DF() (_EFLAGS &= ~DF)
#define isset_DF() ((_EFLAGS & DF) != 0)
       /* nested task flag */
#define set_NT() (_EFLAGS |= NT)
#define clear_NT() (_EFLAGS &= ~NT)
#define isset_NT() ((_EFLAGS & NT) != 0)
       /* trap flag */
#define set_TF() (_EFLAGS |= TF)
#define clear_TF() (_EFLAGS &= ~TF)
#define isset_TF() ((_EFLAGS & TF) != 0)
       /* Virtual Interrupt Pending flag */
#define set_VIP()   (_EFLAGS |= VIP)
#define clear_VIP() (_EFLAGS &= ~VIP)
#define isset_VIP()   ((_EFLAGS & VIP) != 0)

#define set_EFLAGS(eflags) ((_EFLAGS = eflags), ((_EFLAGS & IF)? set_IF(): clear_IF()))
#define set_FLAGS(flags) ((_FLAGS = flags), ((_FLAGS & IF)? set_IF(): clear_IF()))
#define read_EFLAGS() (isset_IF()? (_EFLAGS | IF):(_EFLAGS & ~IF))
#define read_FLAGS()  (isset_IF()? (_FLAGS | IF):(_FLAGS & ~IF))

#define CARRY   set_CF()
#define NOCARRY clear_CF()

#define vflags read_FLAGS()

#if 0
/* this is the array of interrupt vectors */
struct vec_t {
  unsigned short offset;
  unsigned short segment;
};

EXTERN struct vec_t *ivecs;

#endif
#ifdef TRUST_VEC_STRUCT
#define IOFF(i) ivecs[i].offset
#define ISEG(i) ivecs[i].segment
#else
#define IOFF(i) ((us *)0)[  (i)<<1    ]
#define ISEG(i) ((us *)0)[ ((i)<<1) +1]
#endif

#define IVEC(i) ((ISEG(i)<<4) + IOFF(i))
#define SETIVEC(i, seg, ofs)	{ ((us *)0)[ ((i)<<1) +1] = (us)seg; \
				  ((us *)0)[  (i)<<1    ] = (us)ofs; }

#define OP_IRET			0xcf

#ifndef USE_NEW_INT
#define IS_REDIRECTED(i)	(ISEG(i) != BIOSSEG)
#else /* USE_NEW_INT */
#include "memory.h" /* for INT_OFF */
#define IS_REDIRECTED(i)	(IVEC(i) != SEGOFF2LINEAR(BIOSSEG, INT_OFF(i)))
#endif /* USE_NEW_INT */
#define IS_IRET(i)		(*(unsigned char *)IVEC(i) == OP_IRET)

/*
#define WORD(i) (unsigned short)(i)
*/

#ifdef __linux__
  #include "Asm/sigcontext.h"
#endif


#ifdef __linux__
#define _gs     (scp->gs)
#define _fs     (scp->fs)
#define _es     (scp->es)
#define _ds     (scp->ds)
#define _edi    (scp->edi)
#define _esi    (scp->esi)
#define _ebp    (scp->ebp)
#define _esp    (scp->esp)
#define _ebx    (scp->ebx)
#define _edx    (scp->edx)
#define _ecx    (scp->ecx)
#define _eax    (scp->eax)
#define _err	(scp->err)
#define _trapno (scp->trapno)
#define _eip    (scp->eip)
#define _cs     (scp->cs)
#define _eflags (scp->eflags)
#define _ss     (scp->ss)
#define _cr2	(scp->cr2)

void dosemu_fault(int, struct sigcontext_struct);
#endif

void show_regs(char *, int), show_ints(int, int);
#ifdef USE_INT_QUEUE
__inline__ int do_hard_int(int);
#endif

int cpu_trap_0f (unsigned char *, struct sigcontext_struct *);

extern unsigned int read_port_w(unsigned short port);
extern int write_port_w(unsigned int value,unsigned short port);
int do_soft_int(int intno);

#endif /* CPU_H */
