path: root/board/MAI/bios_emulator/scitech/src/v86bios/x86emu.c

/*
 * Copyright 1999 Egbert Eich
 *
 * 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.
 */
#include "debug.h"

#define IF_MASK     0x00000200
#define VIF_MASK    0x00080000  /* virtual interrupt flag */
#define VIP_MASK    0x00100000  /* virtual interrupt pending */

#include </usr/include/unistd.h>
#include <errno.h>
#include <asm/unistd.h>
/*#include <syscall-list.h> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#ifdef __alpha__
#include <sys/io.h>
#endif
#include <signal.h>
#include <setjmp.h>
#include "AsmMacros.h"
#include "v86bios.h"
# define DEBUG
#include "x86emu.h"
#undef DEBUG

#define M            _X86EMU_env
#define CPU_REG(reg) M.x86.R_##reg

struct pio P;

void
setup_io(void)
{
    if (!Config.PrintPort && !Config.IoStatistics) {

#if defined (__i386__)
    P.inb = (u8(*)(u16))inb;
    P.inw = (u16(*)(u16))inw;
    P.outb = (void(*)(u16,u8))outb;
    P.outw = (void(*)(u16,u16))outw;
#else
    P.inb = p_inb;
    P.inw = p_inw;
    P.outb = p_outb;
    P.outw = p_outw;
#endif
#if defined (__i386__) && ! defined(NEED_PCI_IO)
    P.inl = (u32(*)(u16))inl;
    P.outl = (void(*)(u16,u32))outl;
#else
    P.inl = p_inl;
    P.outl = p_outl;
#endif
    } else {
    P.inb = p_inb;
    P.inw = p_inw;
    P.inl = p_inl;
    P.outb = p_outb;
    P.outw = p_outw;
    P.outl = p_outl;
    }
}

void
x86emu_do_int(int num)
{
    struct regs86 regs;

    i_printf("int 0x%x received: ax:0x%x",num,CPU_REG(AX));
    if (Config.PrintIp)
	i_printf(" at: 0x%x\n",getIP());
    else
	i_printf("\n");

    /* try to run bios interrupt */

    /* if not installed fall back */
#define COPY(x,y) regs.y = M.x86.x
#define COPY_R(x,y) M.x86.x = regs.y

    COPY(R_EAX,eax);
    COPY(R_EBX,ebx);
    COPY(R_ECX,ecx);
    COPY(R_EDX,edx);
    COPY(R_ESI,esi);
    COPY(R_EDI,edi);
    COPY(R_EBP,ebp);
    COPY(R_EIP,eip);
    COPY(R_ESP,esp);
    COPY(R_CS,cs);
    COPY(R_SS,ss);
    COPY(R_DS,ds);
    COPY(R_ES,es);
    COPY(R_FS,fs);
    COPY(R_GS,gs);
    COPY(R_EFLG,eflags);

    if (!(int_handler(num,&regs))) {
	if (!run_bios_int(num,&regs))
	    goto unknown_int;
	else
	    return;
    }

    COPY_R(R_EAX,eax);
    COPY_R(R_EBX,ebx);
    COPY_R(R_ECX,ecx);
    COPY_R(R_EDX,edx);
    COPY_R(R_ESI,esi);
    COPY_R(R_EDI,edi);
    COPY_R(R_EBP,ebp);
    COPY_R(R_EIP,eip);
    COPY_R(R_ESP,esp);
    COPY_R(R_CS,cs);
    COPY_R(R_SS,ss);
    COPY_R(R_DS,ds);
    COPY_R(R_ES,es);
    COPY_R(R_FS,fs);
    COPY_R(R_GS,gs);
    COPY_R(R_EFLG,eflags);
    return;

 unknown_int:
    fprintf(stderr,"\nUnknown vm86_int: %X\n\n",num);
    X86EMU_halt_sys();
    return;

#undef COPY
#undef COPY_R
}

void
setup_x86emu(unsigned long bios_start, i86biosRegsPtr regs)
{
    int i;
    CARD32 eip;
    CARD16 cs;
    X86EMU_intrFuncs intFuncs[256];

    X86EMU_pioFuncs pioFuncs = {
	(u8(*)(u16))P.inb,
	(u16(*)(u16))P.inw,
	(u32(*)(u16))P.inl,
	(void(*)(u16,u8))P.outb,
	(void(*)(u16,u16))P.outw,
	(void(*)(u16,u32))P.outl
    };
#ifdef __alpha__
    X86EMU_memFuncs memFuncs = {
      (u8(*)(u32))mem_rb,
      (u16(*)(u32))mem_rw,
      (u32(*)(u32))mem_rl,
      (void(*)(u32,u8))mem_wb,
      (void(*)(u32,u16))mem_ww,
      (void(*)(u32,u32))mem_wl
    };
#endif
    M.mem_base = 0;
    M.mem_size = 1024*1024 + 1024;
    /*  M.x86.debug = DEBUG_DISASSEMBLE_F | DEBUG_TRACE_F | DEBUG_DECODE_F; */
    /*  M.x86.debug |= DEBUG_DECODE_F |  DEBUG_TRACE_F; */
/*
 * For single step tracing compile x86emu with option -DDEBUG
 */
    M.x86.debug = 0;
    if (Config.PrintIp)
	M.x86.debug = DEBUG_SAVE_CS_IP;

    if (Config.Trace)
	X86EMU_trace_on();

    X86EMU_setupPioFuncs(&pioFuncs);
#ifdef __alpha__
    X86EMU_setupMemFuncs(&memFuncs);
#endif
    for (i=0;i<256;i++)
	intFuncs[i] = x86emu_do_int;
    X86EMU_setupIntrFuncs(intFuncs);

    eip = bios_start & 0xFFFF;
    cs = (bios_start & 0xFF0000) >> 4;

    CPU_REG(EAX) = regs->ax;
    CPU_REG(EBX) = regs->bx;
    CPU_REG(ECX) = regs->cx;
    CPU_REG(EDX) = regs->dx;
    CPU_REG(ESI) = regs->si;
    CPU_REG(EDI) = regs->di;
    CPU_REG(EBP) = 0;
    CPU_REG(EIP) = eip;
    CPU_REG(CS) = cs;
    CPU_REG(SP) = 0x100;
    CPU_REG(SS) = 0x30;               /* This is the standard pc bios stack */
    CPU_REG(ES) = regs->es;
    CPU_REG(DS) = regs->ds;
    CPU_REG(FS) = 0;
    CPU_REG(GS) = 0;
    CPU_REG(EFLG) |= (VIF_MASK | VIP_MASK | IF_MASK | 0x2);
}

void
collect_bios_regs(i86biosRegsPtr regs)
{
    regs->ax = CPU_REG(EAX);
    regs->bx = CPU_REG(EBX);
    regs->cx = CPU_REG(ECX);
    regs->dx = CPU_REG(EDX);
    regs->es = CPU_REG(ES);
    regs->ds = CPU_REG(DS);
    regs->di = CPU_REG(EDI);
    regs->si = CPU_REG(ESI);
}

static void
do_x86emu(void)
{
    X86EMU_exec();
}

static jmp_buf x86_esc;
static void
vmexit(int unused)
{
    longjmp(x86_esc,1);
}

void
do_x86(unsigned long bios_start, i86biosRegsPtr regs)
{
    static void (*org_handler)(int);

    setup_x86emu(bios_start,regs);
    if (setjmp(x86_esc) == 0) {
	org_handler = signal(2,vmexit);
	do_x86emu();
	signal(2,org_handler);
	collect_bios_regs(regs);
    } else {
	signal(2,org_handler);
	printf("interrupted at 0x%x\n",((CARD16)CPU_REG(CS)) << 4
	       | (CARD16)CPU_REG(EIP));
    }
}

int
run_bios_int(int num, struct regs86 *regs)
{
#ifdef V86BIOS_DEBUG
    static int firsttime = 1;
#endif
    /* check if bios vector is initialized */
    if (((CARD16*)0)[(num<<1)+1] == 0x0000) { /* SYS_BIOS_SEG ?*/
#ifdef V86BIOS_DEBUG
	i_printf("card BIOS not loaded\n");
#endif
	return 0;
    }

#ifdef V86BIOS_DEBUG
    if (firsttime) {
	dprint(0,0x3D0);
	firsttime = 0;
    }
#endif

    i_printf("calling card BIOS at: ");
    i_printf("0x%x:%x\n",((CARD16 *) 0)[(num << 1) + 1],
	     (CARD32)((CARD16 *) 0)[num << 1]);
    X86EMU_prepareForInt(num);

    return 1;
}

CARD32
getIntVect(int num)
{
  return ((CARD32*)0)[num];
}

CARD32
getIP(void)
{
    return (M.x86.saved_cs << 4) + M.x86.saved_ip;
}