segment.h ( File view )

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			//// 读取fs 段中指定地址处的字节。
// 参数:addr - 指定的内存地址。
// %0 - (返回的字节_v);%1 - (内存地址addr)。
// 返回:返回内存fs:[addr]处的字节。
extern inline unsigned char
get_fs_byte (const char *addr)
{

  unsigned register char _v;

__asm__ ("movb %%fs:%1,%0": "=r" (_v):"m" (*addr));
  return _v;

}

//// 读取fs 段中指定地址处的字。
// 参数:addr - 指定的内存地址。
// %0 - (返回的字_v);%1 - (内存地址addr)。
// 返回:返回内存fs:[addr]处的字。
extern inline unsigned short
get_fs_word (const unsigned short *addr)
{

  unsigned short _v;

__asm__ ("movw %%fs:%1,%0": "=r" (_v):"m" (*addr));
  return _v;

}

//// 读取fs 段中指定地址处的长字(4 字节)。
// 参数:addr - 指定的内存地址。
// %0 - (返回的长字_v);%1 - (内存地址addr)。
// 返回:返回内存fs:[addr]处的长字。
extern inline unsigned long
get_fs_long (const unsigned long *addr)
{

  unsigned long _v;

__asm__ ("movl %%fs:%1,%0": "=r" (_v):"m" (*addr));
  return _v;

}

//// 将一字节存放在fs 段中指定内存地址处。
// 参数:val - 字节值;addr - 内存地址。
// %0 - 寄存器(字节值val);%1 - (内存地址addr)。
extern inline void
put_fs_byte (char val, char *addr)
{

  __asm__ ("movb %0,%%fs:%1"::"r" (val), "m" (*addr));

}

//// 将一字存放在fs 段中指定内存地址处。
// 参数:val - 字值;addr - 内存地址。
// %0 - 寄存器(字值val);%1 - (内存地址addr)。
extern inline void
put_fs_word (short val, short *addr)
{

  __asm__ ("movw %0,%%fs:%1"::"r" (val), "m" (*addr));

}

//// 将一长字存放在fs 段中指定内存地址处。
// 参数:val - 长字值;addr - 内存地址。
// %0 - 寄存器(长字值val);%1 - (内存地址addr)。
extern inline void
put_fs_long (unsigned long val, unsigned long *addr)
{

  __asm__ ("movl %0,%%fs:%1"::"r" (val), "m" (*addr));

}

/*
* Someone who knows GNU asm better than I should double check the followig.
* It seems to work, but I don't know if I'm doing something subtly wrong.
* --- TYT, 11/24/91
* [ nothing wrong here, Linus ]
*/
/*
* 比我更懂GNU 汇编的人应该仔细检查下面的代码。这些代码能使用,但我不知道是否
* 含有一些小错误。
* --- TYT,1991 年11 月24 日
* [ 这些代码没有错误,Linus ]
*/

//// 取fs 段寄存器值(选择符)。
// 返回:fs 段寄存器值。
extern inline unsigned long
get_fs ()
{

  unsigned short _v;
__asm__ ("mov %%fs,%%ax": "=a" (_v):);
  return _v;

}

//// 取ds 段寄存器值。
// 返回:ds 段寄存器值。
extern inline unsigned long
get_ds ()
{

  unsigned short _v;
__asm__ ("mov %%ds,%%ax": "=a" (_v):);
  return _v;

}

//// 设置fs 段寄存器。
// 参数:val - 段值(选择符)。
extern inline void
set_fs (unsigned long val)
{

  __asm__ ("mov %0,%%fs"::"a" ((unsigned short) val));

}
			
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linux0.00 B0% 04-10-07
<boot>0.00 B04-10-07 15:01
bootsect.s12.49 kB08-01-04 21:38
head.s13.22 kB08-01-04 21:38
setup.s12.42 kB08-01-04 21:38
<fs>0.00 B04-10-07 15:01
bitmap.c8.46 kB02-09-04 13:12
block_dev.c3.95 kB02-09-04 13:12
buffer.c17.71 kB02-09-04 13:12
char_dev.c4.09 kB02-09-04 13:12
exec.c18.90 kB02-09-04 13:12
fcntl.c3.33 kB02-09-04 13:12
file_dev.c4.82 kB02-09-04 13:12
file_table.c209.00 B02-09-04 13:12
inode.c14.92 kB02-09-04 13:12
ioctl.c1.94 kB02-09-04 13:12
Makefile6.80 kB08-01-04 21:45
namei.c37.20 kB02-09-04 13:12
open.c10.00 kB02-09-04 13:12
pipe.c5.42 kB02-09-04 13:12
read_write.c5.86 kB02-09-04 13:12
stat.c2.69 kB02-09-04 13:12
super.c13.57 kB02-09-04 13:12
truncate.c2.46 kB02-09-04 13:12
<include>0.00 B04-10-07 15:01
a.out.h8.22 kB02-09-04 13:14
<asm>0.00 B04-10-07 15:01
io.h772.00 B02-09-04 13:14
memory.h1.03 kB08-01-04 22:13
segment.h2.50 kB02-09-04 13:14
system.h4.08 kB02-09-04 13:14
const.h589.00 B02-09-04 13:14
ctype.h1.68 kB02-09-04 13:14
errno.h2.30 kB02-09-04 13:14
fcntl.h3.30 kB02-09-04 13:14
<linux>0.00 B04-10-07 15:01
config.h2.16 kB02-09-04 13:14
fs.h9.72 kB02-09-04 13:14
hdreg.h2.94 kB02-09-04 13:14
head.h760.00 B02-09-04 13:14
kernel.h1.44 kB02-09-04 13:14
mm.h473.00 B02-09-04 13:14
sched.h13.25 kB02-09-04 13:14
sys.h5.41 kB02-09-04 13:14
tty.h3.93 kB02-09-04 13:14
signal.h4.01 kB02-09-04 13:14
stdarg.h1.77 kB02-09-04 13:14
stddef.h378.00 B02-09-04 13:14
string.h21.75 kB02-09-04 13:14
<sys>0.00 B04-10-07 15:01
stat.h2.37 kB02-09-04 13:14
times.h377.00 B02-09-04 13:14
types.h1.10 kB02-09-04 13:14
utsname.h423.00 B02-09-04 13:14
wait.h1.48 kB02-09-04 13:14
termios.h13.58 kB02-09-04 13:14
time.h1.81 kB02-09-04 13:14
unistd.h9.21 kB02-09-04 13:14
utime.h392.00 B02-09-04 13:14
<init>0.00 B04-10-07 15:01
main.c12.52 kB02-09-04 13:12
<kernel>0.00 B04-10-07 15:01
asm.s5.10 kB08-01-04 22:48
<blk_drv>0.00 B04-10-07 15:01
blk.h5.69 kB02-09-04 13:14
floppy.c23.49 kB02-09-04 13:12
hd.c17.14 kB02-09-04 13:12
ll_rw_blk.c7.59 kB02-09-04 13:12
Makefile4.25 kB08-01-04 22:53
ramdisk.c6.13 kB02-09-04 13:12
<chr_drv>0.00 B04-10-07 15:01
console.c30.91 kB02-09-04 13:12
keyboard.S21.04 kB08-01-04 22:59
Makefile4.81 kB08-01-04 22:59
rs_io.s5.75 kB08-01-04 22:59
serial.c2.91 kB02-09-04 13:12
tty_io.c18.40 kB02-09-04 13:12
tty_ioctl.c10.70 kB02-09-04 13:12
exit.c8.08 kB02-09-04 13:12
fork.c6.78 kB15-07-07 22:10
<math>0.00 B04-10-07 15:01
Makefile3.21 kB08-01-04 23:01
math_emulate.c2.08 kB02-09-04 13:12
mktime.c2.72 kB02-09-04 13:12
panic.c952.00 B02-09-04 13:12
printk.c1.75 kB02-09-04 13:12
sched.c18.57 kB16-07-07 21:23
signal.c5.61 kB02-09-04 13:12
sys.c7.62 kB02-09-04 13:12
system_call.s12.53 kB08-01-04 22:48
traps.c8.29 kB04-10-07 14:57
vsprintf.c9.96 kB02-09-04 13:12
<lib>0.00 B04-10-07 15:01
close.c397.00 B02-09-04 13:12
ctype.c1.72 kB02-09-04 13:12
dup.c401.00 B02-09-04 13:12
errno.c66.00 B02-09-04 13:12
execve.c607.00 B02-09-04 13:12
Makefile4.83 kB08-01-04 22:30
malloc.c13.50 kB02-09-04 13:12
open.c1.22 kB02-09-04 13:12
setsid.c382.00 B02-09-04 13:12
string.c199.00 B02-09-04 13:12
wait.c774.00 B02-09-04 13:12
write.c545.00 B02-09-04 13:12
_exit.c616.00 B02-09-04 13:12
Makefile8.58 kB08-01-04 22:21
<mm>0.00 B04-10-07 15:01
Makefile2.91 kB08-01-04 22:34
memory.c25.10 kB02-09-04 13:12
page.s842.00 B08-01-04 22:34
<tools>0.00 B04-10-07 15:01
build.c8.12 kB02-09-04 13:12
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