153 lines
4.6 KiB
C
153 lines
4.6 KiB
C
/* $NetBSD: x86emu_util.c,v 1.2 2007/12/04 17:32:22 joerg 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.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#include <x86emu/x86emu.h>
|
|
#include <x86emu/x86emu_regs.h>
|
|
|
|
#include <sys/endian.h>
|
|
#include <sys/null.h>
|
|
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Byte value read from emulator memory.
|
|
|
|
REMARKS:
|
|
Reads a byte value from the emulator memory.
|
|
****************************************************************************/
|
|
static uint8_t
|
|
rdb(struct X86EMU *emu, uint32_t addr)
|
|
{
|
|
if (addr > emu->mem_size - 1)
|
|
X86EMU_halt_sys(emu);
|
|
return emu->mem_base[addr];
|
|
}
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Word value read from emulator memory.
|
|
|
|
REMARKS:
|
|
Reads a word value from the emulator memory.
|
|
****************************************************************************/
|
|
static uint16_t
|
|
rdw(struct X86EMU *emu, uint32_t addr)
|
|
{
|
|
if (addr > emu->mem_size - 2)
|
|
X86EMU_halt_sys(emu);
|
|
return le16dec(emu->mem_base + addr);
|
|
}
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
|
|
RETURNS:
|
|
Long value read from emulator memory.
|
|
REMARKS:
|
|
Reads a long value from the emulator memory.
|
|
****************************************************************************/
|
|
static uint32_t
|
|
rdl(struct X86EMU *emu, uint32_t addr)
|
|
{
|
|
if (addr > emu->mem_size - 4)
|
|
X86EMU_halt_sys(emu);
|
|
return le32dec(emu->mem_base + addr);
|
|
}
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a byte value to emulator memory.
|
|
****************************************************************************/
|
|
static void
|
|
wrb(struct X86EMU *emu, uint32_t addr, uint8_t val)
|
|
{
|
|
if (addr > emu->mem_size - 1)
|
|
X86EMU_halt_sys(emu);
|
|
emu->mem_base[addr] = val;
|
|
}
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a word value to emulator memory.
|
|
****************************************************************************/
|
|
static void
|
|
wrw(struct X86EMU *emu, uint32_t addr, uint16_t val)
|
|
{
|
|
if (addr > emu->mem_size - 2)
|
|
X86EMU_halt_sys(emu);
|
|
le16enc(emu->mem_base + addr, val);
|
|
}
|
|
/****************************************************************************
|
|
PARAMETERS:
|
|
addr - Emulator memory address to read
|
|
val - Value to store
|
|
|
|
REMARKS:
|
|
Writes a long value to emulator memory.
|
|
****************************************************************************/
|
|
static void
|
|
wrl(struct X86EMU *emu, uint32_t addr, uint32_t val)
|
|
{
|
|
if (addr > emu->mem_size - 4)
|
|
X86EMU_halt_sys(emu);
|
|
le32enc(emu->mem_base + addr, val);
|
|
}
|
|
|
|
/*----------------------------- Setup -------------------------------------*/
|
|
|
|
void
|
|
X86EMU_init_default(struct X86EMU *emu)
|
|
{
|
|
int i;
|
|
|
|
emu->emu_rdb = rdb;
|
|
emu->emu_rdw = rdw;
|
|
emu->emu_rdl = rdl;
|
|
emu->emu_wrb = wrb;
|
|
emu->emu_wrw = wrw;
|
|
emu->emu_wrl = wrl;
|
|
|
|
for (i = 0; i < 256; i++)
|
|
emu->_X86EMU_intrTab[i] = NULL;
|
|
}
|