1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
208 lines
6.5 KiB
C
208 lines
6.5 KiB
C
#ifndef _ASM_IA64_SPINLOCK_H
|
|
#define _ASM_IA64_SPINLOCK_H
|
|
|
|
/*
|
|
* Copyright (C) 1998-2003 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
|
|
*
|
|
* This file is used for SMP configurations only.
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/atomic.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/intrinsics.h>
|
|
#include <asm/system.h>
|
|
|
|
typedef struct {
|
|
volatile unsigned int lock;
|
|
#ifdef CONFIG_PREEMPT
|
|
unsigned int break_lock;
|
|
#endif
|
|
} spinlock_t;
|
|
|
|
#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
|
|
#define spin_lock_init(x) ((x)->lock = 0)
|
|
|
|
#ifdef ASM_SUPPORTED
|
|
/*
|
|
* Try to get the lock. If we fail to get the lock, make a non-standard call to
|
|
* ia64_spinlock_contention(). We do not use a normal call because that would force all
|
|
* callers of spin_lock() to be non-leaf routines. Instead, ia64_spinlock_contention() is
|
|
* carefully coded to touch only those registers that spin_lock() marks "clobbered".
|
|
*/
|
|
|
|
#define IA64_SPINLOCK_CLOBBERS "ar.ccv", "ar.pfs", "p14", "p15", "r27", "r28", "r29", "r30", "b6", "memory"
|
|
|
|
static inline void
|
|
_raw_spin_lock_flags (spinlock_t *lock, unsigned long flags)
|
|
{
|
|
register volatile unsigned int *ptr asm ("r31") = &lock->lock;
|
|
|
|
#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
|
|
# ifdef CONFIG_ITANIUM
|
|
/* don't use brl on Itanium... */
|
|
asm volatile ("{\n\t"
|
|
" mov ar.ccv = r0\n\t"
|
|
" mov r28 = ip\n\t"
|
|
" mov r30 = 1;;\n\t"
|
|
"}\n\t"
|
|
"cmpxchg4.acq r30 = [%1], r30, ar.ccv\n\t"
|
|
"movl r29 = ia64_spinlock_contention_pre3_4;;\n\t"
|
|
"cmp4.ne p14, p0 = r30, r0\n\t"
|
|
"mov b6 = r29;;\n\t"
|
|
"mov r27=%2\n\t"
|
|
"(p14) br.cond.spnt.many b6"
|
|
: "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
|
|
# else
|
|
asm volatile ("{\n\t"
|
|
" mov ar.ccv = r0\n\t"
|
|
" mov r28 = ip\n\t"
|
|
" mov r30 = 1;;\n\t"
|
|
"}\n\t"
|
|
"cmpxchg4.acq r30 = [%1], r30, ar.ccv;;\n\t"
|
|
"cmp4.ne p14, p0 = r30, r0\n\t"
|
|
"mov r27=%2\n\t"
|
|
"(p14) brl.cond.spnt.many ia64_spinlock_contention_pre3_4;;"
|
|
: "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
|
|
# endif /* CONFIG_MCKINLEY */
|
|
#else
|
|
# ifdef CONFIG_ITANIUM
|
|
/* don't use brl on Itanium... */
|
|
/* mis-declare, so we get the entry-point, not it's function descriptor: */
|
|
asm volatile ("mov r30 = 1\n\t"
|
|
"mov r27=%2\n\t"
|
|
"mov ar.ccv = r0;;\n\t"
|
|
"cmpxchg4.acq r30 = [%0], r30, ar.ccv\n\t"
|
|
"movl r29 = ia64_spinlock_contention;;\n\t"
|
|
"cmp4.ne p14, p0 = r30, r0\n\t"
|
|
"mov b6 = r29;;\n\t"
|
|
"(p14) br.call.spnt.many b6 = b6"
|
|
: "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
|
|
# else
|
|
asm volatile ("mov r30 = 1\n\t"
|
|
"mov r27=%2\n\t"
|
|
"mov ar.ccv = r0;;\n\t"
|
|
"cmpxchg4.acq r30 = [%0], r30, ar.ccv;;\n\t"
|
|
"cmp4.ne p14, p0 = r30, r0\n\t"
|
|
"(p14) brl.call.spnt.many b6=ia64_spinlock_contention;;"
|
|
: "=r"(ptr) : "r"(ptr), "r" (flags) : IA64_SPINLOCK_CLOBBERS);
|
|
# endif /* CONFIG_MCKINLEY */
|
|
#endif
|
|
}
|
|
#define _raw_spin_lock(lock) _raw_spin_lock_flags(lock, 0)
|
|
#else /* !ASM_SUPPORTED */
|
|
#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
|
|
# define _raw_spin_lock(x) \
|
|
do { \
|
|
__u32 *ia64_spinlock_ptr = (__u32 *) (x); \
|
|
__u64 ia64_spinlock_val; \
|
|
ia64_spinlock_val = ia64_cmpxchg4_acq(ia64_spinlock_ptr, 1, 0); \
|
|
if (unlikely(ia64_spinlock_val)) { \
|
|
do { \
|
|
while (*ia64_spinlock_ptr) \
|
|
ia64_barrier(); \
|
|
ia64_spinlock_val = ia64_cmpxchg4_acq(ia64_spinlock_ptr, 1, 0); \
|
|
} while (ia64_spinlock_val); \
|
|
} \
|
|
} while (0)
|
|
#endif /* !ASM_SUPPORTED */
|
|
|
|
#define spin_is_locked(x) ((x)->lock != 0)
|
|
#define _raw_spin_unlock(x) do { barrier(); ((spinlock_t *) x)->lock = 0; } while (0)
|
|
#define _raw_spin_trylock(x) (cmpxchg_acq(&(x)->lock, 0, 1) == 0)
|
|
#define spin_unlock_wait(x) do { barrier(); } while ((x)->lock)
|
|
|
|
typedef struct {
|
|
volatile unsigned int read_counter : 31;
|
|
volatile unsigned int write_lock : 1;
|
|
#ifdef CONFIG_PREEMPT
|
|
unsigned int break_lock;
|
|
#endif
|
|
} rwlock_t;
|
|
#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0 }
|
|
|
|
#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0)
|
|
#define read_can_lock(rw) (*(volatile int *)(rw) >= 0)
|
|
#define write_can_lock(rw) (*(volatile int *)(rw) == 0)
|
|
|
|
#define _raw_read_lock(rw) \
|
|
do { \
|
|
rwlock_t *__read_lock_ptr = (rw); \
|
|
\
|
|
while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, acq) < 0)) { \
|
|
ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
|
|
while (*(volatile int *)__read_lock_ptr < 0) \
|
|
cpu_relax(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define _raw_read_unlock(rw) \
|
|
do { \
|
|
rwlock_t *__read_lock_ptr = (rw); \
|
|
ia64_fetchadd(-1, (int *) __read_lock_ptr, rel); \
|
|
} while (0)
|
|
|
|
#ifdef ASM_SUPPORTED
|
|
#define _raw_write_lock(rw) \
|
|
do { \
|
|
__asm__ __volatile__ ( \
|
|
"mov ar.ccv = r0\n" \
|
|
"dep r29 = -1, r0, 31, 1;;\n" \
|
|
"1:\n" \
|
|
"ld4 r2 = [%0];;\n" \
|
|
"cmp4.eq p0,p7 = r0,r2\n" \
|
|
"(p7) br.cond.spnt.few 1b \n" \
|
|
"cmpxchg4.acq r2 = [%0], r29, ar.ccv;;\n" \
|
|
"cmp4.eq p0,p7 = r0, r2\n" \
|
|
"(p7) br.cond.spnt.few 1b;;\n" \
|
|
:: "r"(rw) : "ar.ccv", "p7", "r2", "r29", "memory"); \
|
|
} while(0)
|
|
|
|
#define _raw_write_trylock(rw) \
|
|
({ \
|
|
register long result; \
|
|
\
|
|
__asm__ __volatile__ ( \
|
|
"mov ar.ccv = r0\n" \
|
|
"dep r29 = -1, r0, 31, 1;;\n" \
|
|
"cmpxchg4.acq %0 = [%1], r29, ar.ccv\n" \
|
|
: "=r"(result) : "r"(rw) : "ar.ccv", "r29", "memory"); \
|
|
(result == 0); \
|
|
})
|
|
|
|
#else /* !ASM_SUPPORTED */
|
|
|
|
#define _raw_write_lock(l) \
|
|
({ \
|
|
__u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1); \
|
|
__u32 *ia64_write_lock_ptr = (__u32 *) (l); \
|
|
do { \
|
|
while (*ia64_write_lock_ptr) \
|
|
ia64_barrier(); \
|
|
ia64_val = ia64_cmpxchg4_acq(ia64_write_lock_ptr, ia64_set_val, 0); \
|
|
} while (ia64_val); \
|
|
})
|
|
|
|
#define _raw_write_trylock(rw) \
|
|
({ \
|
|
__u64 ia64_val; \
|
|
__u64 ia64_set_val = ia64_dep_mi(-1, 0, 31,1); \
|
|
ia64_val = ia64_cmpxchg4_acq((__u32 *)(rw), ia64_set_val, 0); \
|
|
(ia64_val == 0); \
|
|
})
|
|
|
|
#endif /* !ASM_SUPPORTED */
|
|
|
|
#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
|
|
|
|
#define _raw_write_unlock(x) \
|
|
({ \
|
|
smp_mb__before_clear_bit(); /* need barrier before releasing lock... */ \
|
|
clear_bit(31, (x)); \
|
|
})
|
|
|
|
#endif /* _ASM_IA64_SPINLOCK_H */
|