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/* $OpenBSD: x86emu_util.c,v 1.5 2009/06/18 14:19:21 pirofti Exp $ */
/* $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 <sys/param.h>
#include <sys/endian.h>
#include <dev/x86emu/x86emu.h>
#include <dev/x86emu/x86emu_regs.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);
#ifdef __STRICT_ALIGNMENT
if (addr & 1) {
u_int8_t *a = emu->mem_base + addr;
u_int16_t r;
r = ((*(a + 0) << 0) & 0x00ff) |
((*(a + 1) << 8) & 0xff00);
return r;
} else
return letoh32(*(u_int32_t *)(emu->mem_base + addr));
#else
return letoh16(*(u_int16_t *)(emu->mem_base + addr));
#endif
}
/*
* 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);
#ifdef __STRICT_ALIGNMENT
if (addr & 3) {
u_int8_t *a = emu->mem_base + addr;
u_int32_t r;
r = ((*(a + 0) << 0) & 0x000000ff) |
((*(a + 1) << 8) & 0x0000ff00) |
((*(a + 2) << 16) & 0x00ff0000) |
((*(a + 3) << 24) & 0xff000000);
return r;
} else
return letoh32(*(u_int32_t *)(emu->mem_base + addr));
#else
return letoh32(*(u_int32_t *)(emu->mem_base + addr));
#endif
}
/*
* 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);
#ifdef __STRICT_ALIGNMENT
if (addr & 1) {
u_int8_t *a = emu->mem_base + addr;
*((a + 0)) = (val >> 0) & 0xff;
*((a + 1)) = (val >> 8) & 0xff;
} else
*((u_int16_t *)(emu->mem_base + addr)) = htole16(val);
#else
*((u_int16_t *)(emu->mem_base + addr)) = htole16(val);
#endif
}
/*
* 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);
#ifdef __STRICT_ALIGNMENT
if (addr & 3) {
u_int8_t *a = emu->mem_base + addr;
*((a + 0) = (val >> 0) & 0xff;
*((a + 1) = (val >> 8) & 0xff;
*((a + 2) = (val >> 16) & 0xff;
*((a + 3) = (val >> 24) & 0xff;
} else
*((u_int32_t *)(emu->mem_base + addr)) = htole32(val);
#else
*((u_int32_t *)(emu->mem_base + addr)) = htole32(val);
#endif
}
/* 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;
}
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