mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
52fdd08903
This patch moves the common code in x86 and x86-64's semaphore.c into a single file in lib/semaphore-sleepers.c. The arch specific asm stubs are left in the arch tree (in semaphore.c for i386 and in the asm for x86-64). There should be no changes in code/functionality with this patch. Signed-off-by: Benjamin LaHaise <benjamin.c.lahaise@intel.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
/*
|
|
* i386 semaphore implementation.
|
|
*
|
|
* (C) Copyright 1999 Linus Torvalds
|
|
*
|
|
* Portions Copyright 1999 Red Hat, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <asm/semaphore.h>
|
|
|
|
/*
|
|
* The semaphore operations have a special calling sequence that
|
|
* allow us to do a simpler in-line version of them. These routines
|
|
* need to convert that sequence back into the C sequence when
|
|
* there is contention on the semaphore.
|
|
*
|
|
* %eax contains the semaphore pointer on entry. Save the C-clobbered
|
|
* registers (%eax, %edx and %ecx) except %eax whish is either a return
|
|
* value or just clobbered..
|
|
*/
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __down_failed\n"
|
|
"__down_failed:\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"pushl %ebp\n\t"
|
|
"movl %esp,%ebp\n\t"
|
|
#endif
|
|
"pushl %edx\n\t"
|
|
"pushl %ecx\n\t"
|
|
"call __down\n\t"
|
|
"popl %ecx\n\t"
|
|
"popl %edx\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"movl %ebp,%esp\n\t"
|
|
"popl %ebp\n\t"
|
|
#endif
|
|
"ret"
|
|
);
|
|
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __down_failed_interruptible\n"
|
|
"__down_failed_interruptible:\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"pushl %ebp\n\t"
|
|
"movl %esp,%ebp\n\t"
|
|
#endif
|
|
"pushl %edx\n\t"
|
|
"pushl %ecx\n\t"
|
|
"call __down_interruptible\n\t"
|
|
"popl %ecx\n\t"
|
|
"popl %edx\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"movl %ebp,%esp\n\t"
|
|
"popl %ebp\n\t"
|
|
#endif
|
|
"ret"
|
|
);
|
|
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __down_failed_trylock\n"
|
|
"__down_failed_trylock:\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"pushl %ebp\n\t"
|
|
"movl %esp,%ebp\n\t"
|
|
#endif
|
|
"pushl %edx\n\t"
|
|
"pushl %ecx\n\t"
|
|
"call __down_trylock\n\t"
|
|
"popl %ecx\n\t"
|
|
"popl %edx\n\t"
|
|
#if defined(CONFIG_FRAME_POINTER)
|
|
"movl %ebp,%esp\n\t"
|
|
"popl %ebp\n\t"
|
|
#endif
|
|
"ret"
|
|
);
|
|
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __up_wakeup\n"
|
|
"__up_wakeup:\n\t"
|
|
"pushl %edx\n\t"
|
|
"pushl %ecx\n\t"
|
|
"call __up\n\t"
|
|
"popl %ecx\n\t"
|
|
"popl %edx\n\t"
|
|
"ret"
|
|
);
|
|
|
|
/*
|
|
* rw spinlock fallbacks
|
|
*/
|
|
#if defined(CONFIG_SMP)
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __write_lock_failed\n"
|
|
"__write_lock_failed:\n\t"
|
|
LOCK "addl $" RW_LOCK_BIAS_STR ",(%eax)\n"
|
|
"1: rep; nop\n\t"
|
|
"cmpl $" RW_LOCK_BIAS_STR ",(%eax)\n\t"
|
|
"jne 1b\n\t"
|
|
LOCK "subl $" RW_LOCK_BIAS_STR ",(%eax)\n\t"
|
|
"jnz __write_lock_failed\n\t"
|
|
"ret"
|
|
);
|
|
|
|
asm(
|
|
".section .sched.text\n"
|
|
".align 4\n"
|
|
".globl __read_lock_failed\n"
|
|
"__read_lock_failed:\n\t"
|
|
LOCK "incl (%eax)\n"
|
|
"1: rep; nop\n\t"
|
|
"cmpl $1,(%eax)\n\t"
|
|
"js 1b\n\t"
|
|
LOCK "decl (%eax)\n\t"
|
|
"js __read_lock_failed\n\t"
|
|
"ret"
|
|
);
|
|
#endif
|