| Server IP : 13.213.54.232 / Your IP : 216.73.216.72 Web Server : Apache/2.4.52 (Ubuntu) System : Linux ip-172-31-17-110 6.8.0-1029-aws #31~22.04.1-Ubuntu SMP Thu Apr 24 21:16:18 UTC 2025 x86_64 User : www-data ( 33) PHP Version : 7.1.33-67+ubuntu22.04.1+deb.sury.org+1 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals, MySQL : OFF | cURL : ON | WGET : ON | Perl : ON | Python : OFF | Sudo : ON | Pkexec : ON Directory : /lib/modules/6.8.0-1031-aws/build/arch/alpha/include/asm/ |
Upload File : |
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ALPHA_SPINLOCK_H
#define _ALPHA_SPINLOCK_H
#include <linux/kernel.h>
#include <asm/current.h>
#include <asm/barrier.h>
#include <asm/processor.h>
/*
* Simple spin lock operations. There are two variants, one clears IRQ's
* on the local processor, one does not.
*
* We make no fairness assumptions. They have a cost.
*/
#define arch_spin_is_locked(x) ((x)->lock != 0)
static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
{
return lock.lock == 0;
}
static inline void arch_spin_unlock(arch_spinlock_t * lock)
{
mb();
lock->lock = 0;
}
static inline void arch_spin_lock(arch_spinlock_t * lock)
{
long tmp;
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" bne %0,2f\n"
" lda %0,1\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
" mb\n"
".subsection 2\n"
"2: ldl %0,%1\n"
" bne %0,2b\n"
" br 1b\n"
".previous"
: "=&r" (tmp), "=m" (lock->lock)
: "m"(lock->lock) : "memory");
}
static inline int arch_spin_trylock(arch_spinlock_t *lock)
{
return !test_and_set_bit(0, &lock->lock);
}
/***********************************************************/
static inline void arch_read_lock(arch_rwlock_t *lock)
{
long regx;
__asm__ __volatile__(
"1: ldl_l %1,%0\n"
" blbs %1,6f\n"
" subl %1,2,%1\n"
" stl_c %1,%0\n"
" beq %1,6f\n"
" mb\n"
".subsection 2\n"
"6: ldl %1,%0\n"
" blbs %1,6b\n"
" br 1b\n"
".previous"
: "=m" (*lock), "=&r" (regx)
: "m" (*lock) : "memory");
}
static inline void arch_write_lock(arch_rwlock_t *lock)
{
long regx;
__asm__ __volatile__(
"1: ldl_l %1,%0\n"
" bne %1,6f\n"
" lda %1,1\n"
" stl_c %1,%0\n"
" beq %1,6f\n"
" mb\n"
".subsection 2\n"
"6: ldl %1,%0\n"
" bne %1,6b\n"
" br 1b\n"
".previous"
: "=m" (*lock), "=&r" (regx)
: "m" (*lock) : "memory");
}
static inline int arch_read_trylock(arch_rwlock_t * lock)
{
long regx;
int success;
__asm__ __volatile__(
"1: ldl_l %1,%0\n"
" lda %2,0\n"
" blbs %1,2f\n"
" subl %1,2,%2\n"
" stl_c %2,%0\n"
" beq %2,6f\n"
"2: mb\n"
".subsection 2\n"
"6: br 1b\n"
".previous"
: "=m" (*lock), "=&r" (regx), "=&r" (success)
: "m" (*lock) : "memory");
return success;
}
static inline int arch_write_trylock(arch_rwlock_t * lock)
{
long regx;
int success;
__asm__ __volatile__(
"1: ldl_l %1,%0\n"
" lda %2,0\n"
" bne %1,2f\n"
" lda %2,1\n"
" stl_c %2,%0\n"
" beq %2,6f\n"
"2: mb\n"
".subsection 2\n"
"6: br 1b\n"
".previous"
: "=m" (*lock), "=&r" (regx), "=&r" (success)
: "m" (*lock) : "memory");
return success;
}
static inline void arch_read_unlock(arch_rwlock_t * lock)
{
long regx;
__asm__ __volatile__(
" mb\n"
"1: ldl_l %1,%0\n"
" addl %1,2,%1\n"
" stl_c %1,%0\n"
" beq %1,6f\n"
".subsection 2\n"
"6: br 1b\n"
".previous"
: "=m" (*lock), "=&r" (regx)
: "m" (*lock) : "memory");
}
static inline void arch_write_unlock(arch_rwlock_t * lock)
{
mb();
lock->lock = 0;
}
#endif /* _ALPHA_SPINLOCK_H */