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/* $Id: segment.h,v 1.27 2009-01-28 14:38:03 potyra Exp $
*
* Copyright (C) 2004-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __SEGMENT_H_INCLUDED
#define __SEGMENT_H_INCLUDED
#include "build_config.h"
#include <stddef.h>
#include <inttypes.h>
#include "compiler.h"
/* ==================== REAL-MODE ==================== */
#if defined(RUNTIME_RM) || defined(INIT_RM)
#include "assert.h"
extern inline unsigned short
get_cs(void)
{
unsigned short cs;
__asm__(
"movw %%cs, %0\n"
: "=r" (cs)
);
return cs;
}
extern inline unsigned short
get_ss(void)
{
unsigned short ss;
__asm__(
"movw %%ss, %0\n"
: "=r" (ss)
);
return ss;
}
extern inline void
put_byte(unsigned short seg, size_t offset, unsigned char val)
{
assert((unsigned long) offset < 0x10000);
asm volatile (
"movw %0, %%es\n"
"movb %2, %%es:(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "q" (val)
: "memory"
);
}
extern inline void
put_word(unsigned short seg, size_t offset, unsigned short val)
{
assert((unsigned long) offset < 0x10000);
asm volatile (
"movw %0, %%es\n"
"movw %2, %%es:(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "r" (val)
: "memory"
);
}
extern inline void
put_long(unsigned short seg, size_t offset, uint32_t val)
{
uint16_t val0;
uint16_t val1;
assert((unsigned long) offset < 0x10000);
val0 = (uint16_t) val;
val1 = (uint16_t) (val>>16);
asm volatile (
"movw %0, %%es\n"
"movw %2, %%es:(%1)\n"
"movw %3, %%es:2(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "r" (val0), "r" (val1)
: "memory"
);
}
extern inline unsigned char
get_byte(unsigned short seg, size_t offset)
{
unsigned char val;
assert((unsigned long) offset < 0x10000);
asm volatile (
"movw %1, %%es\n"
"movb %%es:(%2), %0\n"
: "=q" (val)
: "r" (seg), "b" (offset)
);
return val;
}
extern inline unsigned short
get_word(unsigned short seg, size_t offset)
{
unsigned short val;
assert((unsigned long) offset < 0x10000);
asm volatile (
"movw %1, %%es\n"
"movw %%es:(%2), %0\n"
: "=r" (val)
: "r" (seg), "b" (offset)
);
return val;
}
extern inline uint32_t
get_long(unsigned short seg, size_t offset)
{
uint32_t val;
uint16_t val0;
uint16_t val1;
assert((unsigned long) offset < 0x10000);
asm volatile (
"movw %2, %%es\n"
"movw %%es:(%3), %0\n"
"movw %%es:2(%3), %1\n"
: "=r" (val0), "=r" (val1)
: "r" (seg), "b" (offset)
);
val = val1;
val = (val << 16) + val0;
return val;
}
#endif /* REAL-MODE */
/* ==================== PROTECTED MODE ==================== */
#if defined(RUNTIME_PM)
extern inline void
put_byte(unsigned int seg, size_t offset, uint8_t val)
{
*((uint8_t *) PTR(seg, offset)) = val;
}
extern inline void
put_word(unsigned int seg, size_t offset, uint16_t val)
{
*((int16_t *) PTR(seg, offset)) = val;
}
extern inline void
put_long(unsigned int seg, size_t offset, uint32_t val)
{
*((uint32_t *) PTR(seg, offset)) = val;
}
extern inline uint8_t
get_byte(unsigned int seg, size_t offset)
{
return *((unsigned char *) PTR(seg, offset));
}
extern inline uint16_t
get_word(unsigned int seg, size_t offset)
{
return *((uint16_t *) PTR(seg, offset));
}
extern inline uint32_t
get_long(unsigned int seg, size_t offset)
{
return *((uint32_t *) PTR(seg, offset));
}
#endif /* PROTECTED MODE */
#endif /* __SEGMENT_H_INCLUDED */
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