aboutsummaryrefslogtreecommitdiff
path: root/include/asm-mips/spinlock.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/asm-mips/spinlock.h')
-rw-r--r--include/asm-mips/spinlock.h376
1 files changed, 0 insertions, 376 deletions
diff --git a/include/asm-mips/spinlock.h b/include/asm-mips/spinlock.h
deleted file mode 100644
index bb897016c49..00000000000
--- a/include/asm-mips/spinlock.h
+++ /dev/null
@@ -1,376 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1999, 2000, 06 Ralf Baechle (ralf@linux-mips.org)
- * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
- */
-#ifndef _ASM_SPINLOCK_H
-#define _ASM_SPINLOCK_H
-
-#include <asm/barrier.h>
-#include <asm/war.h>
-
-/*
- * Your basic SMP spinlocks, allowing only a single CPU anywhere
- */
-
-#define __raw_spin_is_locked(x) ((x)->lock != 0)
-#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
-#define __raw_spin_unlock_wait(x) \
- do { cpu_relax(); } while ((x)->lock)
-
-/*
- * 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.
- */
-
-static inline void __raw_spin_lock(raw_spinlock_t *lock)
-{
- unsigned int tmp;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_spin_lock \n"
- "1: ll %1, %2 \n"
- " bnez %1, 1b \n"
- " li %1, 1 \n"
- " sc %1, %0 \n"
- " beqzl %1, 1b \n"
- " nop \n"
- " .set reorder \n"
- : "=m" (lock->lock), "=&r" (tmp)
- : "m" (lock->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_spin_lock \n"
- "1: ll %1, %2 \n"
- " bnez %1, 2f \n"
- " li %1, 1 \n"
- " sc %1, %0 \n"
- " beqz %1, 2f \n"
- " nop \n"
- " .subsection 2 \n"
- "2: ll %1, %2 \n"
- " bnez %1, 2b \n"
- " li %1, 1 \n"
- " b 1b \n"
- " nop \n"
- " .previous \n"
- " .set reorder \n"
- : "=m" (lock->lock), "=&r" (tmp)
- : "m" (lock->lock)
- : "memory");
- }
-
- smp_llsc_mb();
-}
-
-static inline void __raw_spin_unlock(raw_spinlock_t *lock)
-{
- smp_mb();
-
- __asm__ __volatile__(
- " .set noreorder # __raw_spin_unlock \n"
- " sw $0, %0 \n"
- " .set\treorder \n"
- : "=m" (lock->lock)
- : "m" (lock->lock)
- : "memory");
-}
-
-static inline unsigned int __raw_spin_trylock(raw_spinlock_t *lock)
-{
- unsigned int temp, res;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_spin_trylock \n"
- "1: ll %0, %3 \n"
- " ori %2, %0, 1 \n"
- " sc %2, %1 \n"
- " beqzl %2, 1b \n"
- " nop \n"
- " andi %2, %0, 1 \n"
- " .set reorder"
- : "=&r" (temp), "=m" (lock->lock), "=&r" (res)
- : "m" (lock->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_spin_trylock \n"
- "1: ll %0, %3 \n"
- " ori %2, %0, 1 \n"
- " sc %2, %1 \n"
- " beqz %2, 2f \n"
- " andi %2, %0, 1 \n"
- " .subsection 2 \n"
- "2: b 1b \n"
- " nop \n"
- " .previous \n"
- " .set reorder"
- : "=&r" (temp), "=m" (lock->lock), "=&r" (res)
- : "m" (lock->lock)
- : "memory");
- }
-
- smp_llsc_mb();
-
- return res == 0;
-}
-
-/*
- * Read-write spinlocks, allowing multiple readers but only one writer.
- *
- * NOTE! it is quite common to have readers in interrupts but no interrupt
- * writers. For those circumstances we can "mix" irq-safe locks - any writer
- * needs to get a irq-safe write-lock, but readers can get non-irqsafe
- * read-locks.
- */
-
-/*
- * read_can_lock - would read_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define __raw_read_can_lock(rw) ((rw)->lock >= 0)
-
-/*
- * write_can_lock - would write_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define __raw_write_can_lock(rw) (!(rw)->lock)
-
-static inline void __raw_read_lock(raw_rwlock_t *rw)
-{
- unsigned int tmp;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_read_lock \n"
- "1: ll %1, %2 \n"
- " bltz %1, 1b \n"
- " addu %1, 1 \n"
- " sc %1, %0 \n"
- " beqzl %1, 1b \n"
- " nop \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_read_lock \n"
- "1: ll %1, %2 \n"
- " bltz %1, 2f \n"
- " addu %1, 1 \n"
- " sc %1, %0 \n"
- " beqz %1, 1b \n"
- " nop \n"
- " .subsection 2 \n"
- "2: ll %1, %2 \n"
- " bltz %1, 2b \n"
- " addu %1, 1 \n"
- " b 1b \n"
- " nop \n"
- " .previous \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- }
-
- smp_llsc_mb();
-}
-
-/* Note the use of sub, not subu which will make the kernel die with an
- overflow exception if we ever try to unlock an rwlock that is already
- unlocked or is being held by a writer. */
-static inline void __raw_read_unlock(raw_rwlock_t *rw)
-{
- unsigned int tmp;
-
- smp_llsc_mb();
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- "1: ll %1, %2 # __raw_read_unlock \n"
- " sub %1, 1 \n"
- " sc %1, %0 \n"
- " beqzl %1, 1b \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_read_unlock \n"
- "1: ll %1, %2 \n"
- " sub %1, 1 \n"
- " sc %1, %0 \n"
- " beqz %1, 2f \n"
- " nop \n"
- " .subsection 2 \n"
- "2: b 1b \n"
- " nop \n"
- " .previous \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- }
-}
-
-static inline void __raw_write_lock(raw_rwlock_t *rw)
-{
- unsigned int tmp;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_write_lock \n"
- "1: ll %1, %2 \n"
- " bnez %1, 1b \n"
- " lui %1, 0x8000 \n"
- " sc %1, %0 \n"
- " beqzl %1, 1b \n"
- " nop \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_write_lock \n"
- "1: ll %1, %2 \n"
- " bnez %1, 2f \n"
- " lui %1, 0x8000 \n"
- " sc %1, %0 \n"
- " beqz %1, 2f \n"
- " nop \n"
- " .subsection 2 \n"
- "2: ll %1, %2 \n"
- " bnez %1, 2b \n"
- " lui %1, 0x8000 \n"
- " b 1b \n"
- " nop \n"
- " .previous \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp)
- : "m" (rw->lock)
- : "memory");
- }
-
- smp_llsc_mb();
-}
-
-static inline void __raw_write_unlock(raw_rwlock_t *rw)
-{
- smp_mb();
-
- __asm__ __volatile__(
- " # __raw_write_unlock \n"
- " sw $0, %0 \n"
- : "=m" (rw->lock)
- : "m" (rw->lock)
- : "memory");
-}
-
-static inline int __raw_read_trylock(raw_rwlock_t *rw)
-{
- unsigned int tmp;
- int ret;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_read_trylock \n"
- " li %2, 0 \n"
- "1: ll %1, %3 \n"
- " bltz %1, 2f \n"
- " addu %1, 1 \n"
- " sc %1, %0 \n"
- " .set reorder \n"
- " beqzl %1, 1b \n"
- " nop \n"
- __WEAK_LLSC_MB
- " li %2, 1 \n"
- "2: \n"
- : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret)
- : "m" (rw->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_read_trylock \n"
- " li %2, 0 \n"
- "1: ll %1, %3 \n"
- " bltz %1, 2f \n"
- " addu %1, 1 \n"
- " sc %1, %0 \n"
- " beqz %1, 1b \n"
- " nop \n"
- " .set reorder \n"
- __WEAK_LLSC_MB
- " li %2, 1 \n"
- "2: \n"
- : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret)
- : "m" (rw->lock)
- : "memory");
- }
-
- return ret;
-}
-
-static inline int __raw_write_trylock(raw_rwlock_t *rw)
-{
- unsigned int tmp;
- int ret;
-
- if (R10000_LLSC_WAR) {
- __asm__ __volatile__(
- " .set noreorder # __raw_write_trylock \n"
- " li %2, 0 \n"
- "1: ll %1, %3 \n"
- " bnez %1, 2f \n"
- " lui %1, 0x8000 \n"
- " sc %1, %0 \n"
- " beqzl %1, 1b \n"
- " nop \n"
- __WEAK_LLSC_MB
- " li %2, 1 \n"
- " .set reorder \n"
- "2: \n"
- : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret)
- : "m" (rw->lock)
- : "memory");
- } else {
- __asm__ __volatile__(
- " .set noreorder # __raw_write_trylock \n"
- " li %2, 0 \n"
- "1: ll %1, %3 \n"
- " bnez %1, 2f \n"
- " lui %1, 0x8000 \n"
- " sc %1, %0 \n"
- " beqz %1, 3f \n"
- " li %2, 1 \n"
- "2: \n"
- __WEAK_LLSC_MB
- " .subsection 2 \n"
- "3: b 1b \n"
- " li %2, 0 \n"
- " .previous \n"
- " .set reorder \n"
- : "=m" (rw->lock), "=&r" (tmp), "=&r" (ret)
- : "m" (rw->lock)
- : "memory");
- }
-
- return ret;
-}
-
-
-#define _raw_spin_relax(lock) cpu_relax()
-#define _raw_read_relax(lock) cpu_relax()
-#define _raw_write_relax(lock) cpu_relax()
-
-#endif /* _ASM_SPINLOCK_H */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-20 01:24:27 +0000