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authorRich Felker <dalias@libc.org>2016-02-12 21:59:39 +0000
committerRich Felker <dalias@libc.org>2016-04-28 20:48:23 +0000
commit91a5a8b1e30f5136052873073f28efe30a0bf6ff (patch)
treea3b1779bff1fae708a1435931a81fdf80ab5c3f4
parentbc5d710f8d251116f5d3e569aafefa78523b5fcc (diff)
downloadlinux-sh-91a5a8b1e30f5136052873073f28efe30a0bf6ff.tar.gz
sh: add J2 atomics using the cas.l instruction
Signed-off-by: Rich Felker <dalias@libc.org>
-rw-r--r--arch/sh/include/asm/atomic.h8
-rw-r--r--arch/sh/include/asm/barrier.h5
-rw-r--r--arch/sh/include/asm/bitops-cas.h93
-rw-r--r--arch/sh/include/asm/bitops.h2
-rw-r--r--arch/sh/include/asm/cmpxchg-cas.h24
-rw-r--r--arch/sh/include/asm/cmpxchg.h2
-rw-r--r--arch/sh/include/asm/spinlock-cas.h111
-rw-r--r--arch/sh/include/asm/spinlock-llsc.h218
-rw-r--r--arch/sh/include/asm/spinlock.h216
9 files changed, 469 insertions, 210 deletions
diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h
index c399e1c55685..8a7bd80c8b33 100644
--- a/arch/sh/include/asm/atomic.h
+++ b/arch/sh/include/asm/atomic.h
@@ -1,6 +1,12 @@
#ifndef __ASM_SH_ATOMIC_H
#define __ASM_SH_ATOMIC_H
+#if defined(CONFIG_CPU_J2)
+
+#include <asm-generic/atomic.h>
+
+#else
+
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc..
@@ -63,4 +69,6 @@ static inline int __atomic_add_unless(atomic_t *v, int a, int u)
return c;
}
+#endif /* CONFIG_CPU_J2 */
+
#endif /* __ASM_SH_ATOMIC_H */
diff --git a/arch/sh/include/asm/barrier.h b/arch/sh/include/asm/barrier.h
index 8a84e05adb2e..3c30b6e166b6 100644
--- a/arch/sh/include/asm/barrier.h
+++ b/arch/sh/include/asm/barrier.h
@@ -29,6 +29,11 @@
#define wmb() mb()
#define ctrl_barrier() __icbi(PAGE_OFFSET)
#else
+#if defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
+#define __smp_mb() do { int tmp = 0; __asm__ __volatile__ ("cas.l %0,%0,@%1" : "+r"(tmp) : "z"(&tmp) : "memory", "t"); } while(0)
+#define __smp_rmb() __smp_mb()
+#define __smp_wmb() __smp_mb()
+#endif
#define ctrl_barrier() __asm__ __volatile__ ("nop;nop;nop;nop;nop;nop;nop;nop")
#endif
diff --git a/arch/sh/include/asm/bitops-cas.h b/arch/sh/include/asm/bitops-cas.h
new file mode 100644
index 000000000000..88f793c04d3c
--- /dev/null
+++ b/arch/sh/include/asm/bitops-cas.h
@@ -0,0 +1,93 @@
+#ifndef __ASM_SH_BITOPS_CAS_H
+#define __ASM_SH_BITOPS_CAS_H
+
+static inline unsigned __bo_cas(volatile unsigned *p, unsigned old, unsigned new)
+{
+ __asm__ __volatile__("cas.l %1,%0,@r0"
+ : "+r"(new)
+ : "r"(old), "z"(p)
+ : "t", "memory" );
+ return new;
+}
+
+static inline void set_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old|mask) != old);
+}
+
+static inline void clear_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old&~mask) != old);
+}
+
+static inline void change_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old^mask) != old);
+}
+
+static inline int test_and_set_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old|mask) != old);
+
+ return !!(old & mask);
+}
+
+static inline int test_and_clear_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old&~mask) != old);
+
+ return !!(old & mask);
+}
+
+static inline int test_and_change_bit(int nr, volatile void *addr)
+{
+ unsigned mask, old;
+ volatile unsigned *a = addr;
+
+ a += nr >> 5;
+ mask = 1U << (nr & 0x1f);
+
+ do old = *a;
+ while (__bo_cas(a, old, old^mask) != old);
+
+ return !!(old & mask);
+}
+
+#include <asm-generic/bitops/non-atomic.h>
+
+#endif /* __ASM_SH_BITOPS_CAS_H */
diff --git a/arch/sh/include/asm/bitops.h b/arch/sh/include/asm/bitops.h
index fc8e652cf173..a8699d60a8c4 100644
--- a/arch/sh/include/asm/bitops.h
+++ b/arch/sh/include/asm/bitops.h
@@ -18,6 +18,8 @@
#include <asm/bitops-op32.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/bitops-llsc.h>
+#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
+#include <asm/bitops-cas.h>
#else
#include <asm-generic/bitops/atomic.h>
#include <asm-generic/bitops/non-atomic.h>
diff --git a/arch/sh/include/asm/cmpxchg-cas.h b/arch/sh/include/asm/cmpxchg-cas.h
new file mode 100644
index 000000000000..d0d86649e8c1
--- /dev/null
+++ b/arch/sh/include/asm/cmpxchg-cas.h
@@ -0,0 +1,24 @@
+#ifndef __ASM_SH_CMPXCHG_CAS_H
+#define __ASM_SH_CMPXCHG_CAS_H
+
+static inline unsigned long
+__cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)
+{
+ __asm__ __volatile__("cas.l %1,%0,@r0"
+ : "+r"(new)
+ : "r"(old), "z"(m)
+ : "t", "memory" );
+ return new;
+}
+
+static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
+{
+ unsigned long old;
+ do old = *m;
+ while (__cmpxchg_u32(m, old, val) != old);
+ return old;
+}
+
+#include <asm/cmpxchg-xchg.h>
+
+#endif /* __ASM_SH_CMPXCHG_CAS_H */
diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
index 5225916c1057..3dfe0467a773 100644
--- a/arch/sh/include/asm/cmpxchg.h
+++ b/arch/sh/include/asm/cmpxchg.h
@@ -13,6 +13,8 @@
#include <asm/cmpxchg-grb.h>
#elif defined(CONFIG_CPU_SH4A)
#include <asm/cmpxchg-llsc.h>
+#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
+#include <asm/cmpxchg-cas.h>
#else
#include <asm/cmpxchg-irq.h>
#endif
diff --git a/arch/sh/include/asm/spinlock-cas.h b/arch/sh/include/asm/spinlock-cas.h
new file mode 100644
index 000000000000..a2a7c10b30d9
--- /dev/null
+++ b/arch/sh/include/asm/spinlock-cas.h
@@ -0,0 +1,111 @@
+/*
+ * include/asm-sh/spinlock-cas.h
+ *
+ * Copyright (C) 2015 SEI
+ *
+ * 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.
+ */
+#ifndef __ASM_SH_SPINLOCK_CAS_H
+#define __ASM_SH_SPINLOCK_CAS_H
+
+static inline unsigned __sl_cas(volatile unsigned *p, unsigned old, unsigned new)
+{
+ __asm__ __volatile__("cas.l %1,%0,@r0"
+ : "+r"(new)
+ : "r"(old), "z"(p)
+ : "t", "memory" );
+ return new;
+}
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+#define arch_spin_is_locked(x) ((x)->lock <= 0)
+#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
+#define arch_spin_unlock_wait(x) \
+ do { while (arch_spin_is_locked(x)) cpu_relax(); } while (0)
+
+static inline void arch_spin_lock(arch_spinlock_t *lock)
+{
+ while (!__sl_cas(&lock->lock, 1, 0));
+}
+
+static inline void arch_spin_unlock(arch_spinlock_t *lock)
+{
+ __sl_cas(&lock->lock, 0, 1);
+}
+
+static inline int arch_spin_trylock(arch_spinlock_t *lock)
+{
+ return __sl_cas(&lock->lock, 1, 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 arch_read_can_lock(x) ((x)->lock > 0)
+
+/**
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
+
+static inline void arch_read_lock(arch_rwlock_t *rw)
+{
+ unsigned old;
+ do old = rw->lock;
+ while (!old || __sl_cas(&rw->lock, old, old-1) != old);
+}
+
+static inline void arch_read_unlock(arch_rwlock_t *rw)
+{
+ unsigned old;
+ do old = rw->lock;
+ while (__sl_cas(&rw->lock, old, old+1) != old);
+}
+
+static inline void arch_write_lock(arch_rwlock_t *rw)
+{
+ while (__sl_cas(&rw->lock, RW_LOCK_BIAS, 0) != RW_LOCK_BIAS);
+}
+
+static inline void arch_write_unlock(arch_rwlock_t *rw)
+{
+ __sl_cas(&rw->lock, 0, RW_LOCK_BIAS);
+}
+
+static inline int arch_read_trylock(arch_rwlock_t *rw)
+{
+ unsigned old;
+ do old = rw->lock;
+ while (old && __sl_cas(&rw->lock, old, old-1) != old);
+ return !!old;
+}
+
+static inline int arch_write_trylock(arch_rwlock_t *rw)
+{
+ return __sl_cas(&rw->lock, RW_LOCK_BIAS, 0) == RW_LOCK_BIAS;
+}
+
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
+#define arch_spin_relax(lock) cpu_relax()
+#define arch_read_relax(lock) cpu_relax()
+#define arch_write_relax(lock) cpu_relax()
+
+#endif /* __ASM_SH_SPINLOCK_CAS_H */
diff --git a/arch/sh/include/asm/spinlock-llsc.h b/arch/sh/include/asm/spinlock-llsc.h
new file mode 100644
index 000000000000..238ef6f54dcc
--- /dev/null
+++ b/arch/sh/include/asm/spinlock-llsc.h
@@ -0,0 +1,218 @@
+/*
+ * include/asm-sh/spinlock-llsc.h
+ *
+ * Copyright (C) 2002, 2003 Paul Mundt
+ * Copyright (C) 2006, 2007 Akio Idehara
+ *
+ * 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.
+ */
+#ifndef __ASM_SH_SPINLOCK_LLSC_H
+#define __ASM_SH_SPINLOCK_LLSC_H
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+#define arch_spin_is_locked(x) ((x)->lock <= 0)
+#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
+#define arch_spin_unlock_wait(x) \
+ do { while (arch_spin_is_locked(x)) cpu_relax(); } while (0)
+
+/*
+ * 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 arch_spin_lock(arch_spinlock_t *lock)
+{
+ unsigned long tmp;
+ unsigned long oldval;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%2, %0 ! arch_spin_lock \n\t"
+ "mov %0, %1 \n\t"
+ "mov #0, %0 \n\t"
+ "movco.l %0, @%2 \n\t"
+ "bf 1b \n\t"
+ "cmp/pl %1 \n\t"
+ "bf 1b \n\t"
+ : "=&z" (tmp), "=&r" (oldval)
+ : "r" (&lock->lock)
+ : "t", "memory"
+ );
+}
+
+static inline void arch_spin_unlock(arch_spinlock_t *lock)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "mov #1, %0 ! arch_spin_unlock \n\t"
+ "mov.l %0, @%1 \n\t"
+ : "=&z" (tmp)
+ : "r" (&lock->lock)
+ : "t", "memory"
+ );
+}
+
+static inline int arch_spin_trylock(arch_spinlock_t *lock)
+{
+ unsigned long tmp, oldval;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%2, %0 ! arch_spin_trylock \n\t"
+ "mov %0, %1 \n\t"
+ "mov #0, %0 \n\t"
+ "movco.l %0, @%2 \n\t"
+ "bf 1b \n\t"
+ "synco \n\t"
+ : "=&z" (tmp), "=&r" (oldval)
+ : "r" (&lock->lock)
+ : "t", "memory"
+ );
+
+ return oldval;
+}
+
+/*
+ * 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 arch_read_can_lock(x) ((x)->lock > 0)
+
+/**
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
+
+static inline void arch_read_lock(arch_rwlock_t *rw)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! arch_read_lock \n\t"
+ "cmp/pl %0 \n\t"
+ "bf 1b \n\t"
+ "add #-1, %0 \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ : "=&z" (tmp)
+ : "r" (&rw->lock)
+ : "t", "memory"
+ );
+}
+
+static inline void arch_read_unlock(arch_rwlock_t *rw)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! arch_read_unlock \n\t"
+ "add #1, %0 \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ : "=&z" (tmp)
+ : "r" (&rw->lock)
+ : "t", "memory"
+ );
+}
+
+static inline void arch_write_lock(arch_rwlock_t *rw)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%1, %0 ! arch_write_lock \n\t"
+ "cmp/hs %2, %0 \n\t"
+ "bf 1b \n\t"
+ "sub %2, %0 \n\t"
+ "movco.l %0, @%1 \n\t"
+ "bf 1b \n\t"
+ : "=&z" (tmp)
+ : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
+ : "t", "memory"
+ );
+}
+
+static inline void arch_write_unlock(arch_rwlock_t *rw)
+{
+ __asm__ __volatile__ (
+ "mov.l %1, @%0 ! arch_write_unlock \n\t"
+ :
+ : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
+ : "t", "memory"
+ );
+}
+
+static inline int arch_read_trylock(arch_rwlock_t *rw)
+{
+ unsigned long tmp, oldval;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%2, %0 ! arch_read_trylock \n\t"
+ "mov %0, %1 \n\t"
+ "cmp/pl %0 \n\t"
+ "bf 2f \n\t"
+ "add #-1, %0 \n\t"
+ "movco.l %0, @%2 \n\t"
+ "bf 1b \n\t"
+ "2: \n\t"
+ "synco \n\t"
+ : "=&z" (tmp), "=&r" (oldval)
+ : "r" (&rw->lock)
+ : "t", "memory"
+ );
+
+ return (oldval > 0);
+}
+
+static inline int arch_write_trylock(arch_rwlock_t *rw)
+{
+ unsigned long tmp, oldval;
+
+ __asm__ __volatile__ (
+ "1: \n\t"
+ "movli.l @%2, %0 ! arch_write_trylock \n\t"
+ "mov %0, %1 \n\t"
+ "cmp/hs %3, %0 \n\t"
+ "bf 2f \n\t"
+ "sub %3, %0 \n\t"
+ "2: \n\t"
+ "movco.l %0, @%2 \n\t"
+ "bf 1b \n\t"
+ "synco \n\t"
+ : "=&z" (tmp), "=&r" (oldval)
+ : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
+ : "t", "memory"
+ );
+
+ return (oldval > (RW_LOCK_BIAS - 1));
+}
+
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
+#define arch_spin_relax(lock) cpu_relax()
+#define arch_read_relax(lock) cpu_relax()
+#define arch_write_relax(lock) cpu_relax()
+
+#endif /* __ASM_SH_SPINLOCK_LLSC_H */
diff --git a/arch/sh/include/asm/spinlock.h b/arch/sh/include/asm/spinlock.h
index bdc0f3b6c56a..c2c61ea6a8e2 100644
--- a/arch/sh/include/asm/spinlock.h
+++ b/arch/sh/include/asm/spinlock.h
@@ -11,216 +11,12 @@
#ifndef __ASM_SH_SPINLOCK_H
#define __ASM_SH_SPINLOCK_H
-/*
- * The only locking implemented here uses SH-4A opcodes. For others,
- * split this out as per atomic-*.h.
- */
-#ifndef CONFIG_CPU_SH4A
-#error "Need movli.l/movco.l for spinlocks"
+#if defined(CONFIG_CPU_SH4A)
+#include <asm/spinlock-llsc.h>
+#elif defined(CONFIG_CPU_J2)
+#include <asm/spinlock-cas.h>
+#else
+#error "The configured cpu type does not support spinlocks"
#endif
-/*
- * Your basic SMP spinlocks, allowing only a single CPU anywhere
- */
-
-#define arch_spin_is_locked(x) ((x)->lock <= 0)
-#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
-#define arch_spin_unlock_wait(x) \
- do { while (arch_spin_is_locked(x)) cpu_relax(); } while (0)
-
-/*
- * 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 arch_spin_lock(arch_spinlock_t *lock)
-{
- unsigned long tmp;
- unsigned long oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_spin_lock \n\t"
- "mov %0, %1 \n\t"
- "mov #0, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "cmp/pl %1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-}
-
-static inline void arch_spin_unlock(arch_spinlock_t *lock)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "mov #1, %0 ! arch_spin_unlock \n\t"
- "mov.l %0, @%1 \n\t"
- : "=&z" (tmp)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-}
-
-static inline int arch_spin_trylock(arch_spinlock_t *lock)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_spin_trylock \n\t"
- "mov %0, %1 \n\t"
- "mov #0, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&lock->lock)
- : "t", "memory"
- );
-
- return oldval;
-}
-
-/*
- * 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 arch_read_can_lock(x) ((x)->lock > 0)
-
-/**
- * write_can_lock - would write_trylock() succeed?
- * @lock: the rwlock in question.
- */
-#define arch_write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
-
-static inline void arch_read_lock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_read_lock \n\t"
- "cmp/pl %0 \n\t"
- "bf 1b \n\t"
- "add #-1, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-}
-
-static inline void arch_read_unlock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_read_unlock \n\t"
- "add #1, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-}
-
-static inline void arch_write_lock(arch_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%1, %0 ! arch_write_lock \n\t"
- "cmp/hs %2, %0 \n\t"
- "bf 1b \n\t"
- "sub %2, %0 \n\t"
- "movco.l %0, @%1 \n\t"
- "bf 1b \n\t"
- : "=&z" (tmp)
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-}
-
-static inline void arch_write_unlock(arch_rwlock_t *rw)
-{
- __asm__ __volatile__ (
- "mov.l %1, @%0 ! arch_write_unlock \n\t"
- :
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-}
-
-static inline int arch_read_trylock(arch_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_read_trylock \n\t"
- "mov %0, %1 \n\t"
- "cmp/pl %0 \n\t"
- "bf 2f \n\t"
- "add #-1, %0 \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "2: \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&rw->lock)
- : "t", "memory"
- );
-
- return (oldval > 0);
-}
-
-static inline int arch_write_trylock(arch_rwlock_t *rw)
-{
- unsigned long tmp, oldval;
-
- __asm__ __volatile__ (
- "1: \n\t"
- "movli.l @%2, %0 ! arch_write_trylock \n\t"
- "mov %0, %1 \n\t"
- "cmp/hs %3, %0 \n\t"
- "bf 2f \n\t"
- "sub %3, %0 \n\t"
- "2: \n\t"
- "movco.l %0, @%2 \n\t"
- "bf 1b \n\t"
- "synco \n\t"
- : "=&z" (tmp), "=&r" (oldval)
- : "r" (&rw->lock), "r" (RW_LOCK_BIAS)
- : "t", "memory"
- );
-
- return (oldval > (RW_LOCK_BIAS - 1));
-}
-
-#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
-#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
-
-#define arch_spin_relax(lock) cpu_relax()
-#define arch_read_relax(lock) cpu_relax()
-#define arch_write_relax(lock) cpu_relax()
-
#endif /* __ASM_SH_SPINLOCK_H */