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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 08/45] xen: arm64: spinlocks
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
xen/include/asm-arm/arm32/spinlock.h | 141 ++++++++++++++++++++++++++++++++++
xen/include/asm-arm/arm64/spinlock.h | 125 ++++++++++++++++++++++++++++++
xen/include/asm-arm/spinlock.h | 135 ++------------------------------
3 files changed, 273 insertions(+), 128 deletions(-)
create mode 100644 xen/include/asm-arm/arm32/spinlock.h
create mode 100644 xen/include/asm-arm/arm64/spinlock.h
diff --git a/xen/include/asm-arm/arm32/spinlock.h
b/xen/include/asm-arm/arm32/spinlock.h
new file mode 100644
index 0000000..a7bcdbf
--- /dev/null
+++ b/xen/include/asm-arm/arm32/spinlock.h
@@ -0,0 +1,141 @@
+#ifndef __ASM_ARM32_SPINLOCK_H
+#define __ASM_ARM32_SPINLOCK_H
+
+static inline void dsb_sev(void)
+{
+ __asm__ __volatile__ (
+ "dsb\n"
+ "sev\n"
+ );
+}
+
+typedef struct {
+ volatile unsigned int lock;
+} raw_spinlock_t;
+
+#define _RAW_SPIN_LOCK_UNLOCKED { 0 }
+
+#define _raw_spin_is_locked(x) ((x)->lock != 0)
+
+static always_inline void _raw_spin_unlock(raw_spinlock_t *lock)
+{
+ ASSERT(_raw_spin_is_locked(lock));
+
+ smp_mb();
+
+ __asm__ __volatile__(
+" str %1, [%0]\n"
+ :
+ : "r" (&lock->lock), "r" (0)
+ : "cc");
+
+ dsb_sev();
+}
+
+static always_inline int _raw_spin_trylock(raw_spinlock_t *lock)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__(
+" ldrex %0, [%1]\n"
+" teq %0, #0\n"
+" strexeq %0, %2, [%1]"
+ : "=&r" (tmp)
+ : "r" (&lock->lock), "r" (1)
+ : "cc");
+
+ if (tmp == 0) {
+ smp_mb();
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+typedef struct {
+ volatile unsigned int lock;
+} raw_rwlock_t;
+
+#define _RAW_RW_LOCK_UNLOCKED { 0 }
+
+static always_inline int _raw_read_trylock(raw_rwlock_t *rw)
+{
+ unsigned long tmp, tmp2 = 1;
+
+ __asm__ __volatile__(
+"1: ldrex %0, [%2]\n"
+" adds %0, %0, #1\n"
+" strexpl %1, %0, [%2]\n"
+ : "=&r" (tmp), "+r" (tmp2)
+ : "r" (&rw->lock)
+ : "cc");
+
+ smp_mb();
+ return tmp2 == 0;
+}
+
+static always_inline int _raw_write_trylock(raw_rwlock_t *rw)
+{
+ unsigned long tmp;
+
+ __asm__ __volatile__(
+"1: ldrex %0, [%1]\n"
+" teq %0, #0\n"
+" strexeq %0, %2, [%1]"
+ : "=&r" (tmp)
+ : "r" (&rw->lock), "r" (0x80000000)
+ : "cc");
+
+ if (tmp == 0) {
+ smp_mb();
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+static inline void _raw_read_unlock(raw_rwlock_t *rw)
+{
+ unsigned long tmp, tmp2;
+
+ smp_mb();
+
+ __asm__ __volatile__(
+"1: ldrex %0, [%2]\n"
+" sub %0, %0, #1\n"
+" strex %1, %0, [%2]\n"
+" teq %1, #0\n"
+" bne 1b"
+ : "=&r" (tmp), "=&r" (tmp2)
+ : "r" (&rw->lock)
+ : "cc");
+
+ if (tmp == 0)
+ dsb_sev();
+}
+
+static inline void _raw_write_unlock(raw_rwlock_t *rw)
+{
+ smp_mb();
+
+ __asm__ __volatile__(
+ "str %1, [%0]\n"
+ :
+ : "r" (&rw->lock), "r" (0)
+ : "cc");
+
+ dsb_sev();
+}
+
+#define _raw_rw_is_locked(x) ((x)->lock != 0)
+#define _raw_rw_is_write_locked(x) ((x)->lock == 0x80000000)
+
+#endif /* __ASM_SPINLOCK_H */
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/arm64/spinlock.h
b/xen/include/asm-arm/arm64/spinlock.h
new file mode 100644
index 0000000..52ad688
--- /dev/null
+++ b/xen/include/asm-arm/arm64/spinlock.h
@@ -0,0 +1,125 @@
+/*
+ * Derived from Linux arch64 spinlock.h which is:
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM64_SPINLOCK_H
+#define __ASM_ARM64_SPINLOCK_H
+
+typedef struct {
+ volatile unsigned int lock;
+} raw_spinlock_t;
+
+#define _RAW_SPIN_LOCK_UNLOCKED { 0 }
+
+#define _raw_spin_is_locked(x) ((x)->lock != 0)
+
+static always_inline void _raw_spin_unlock(raw_spinlock_t *lock)
+{
+ ASSERT(_raw_spin_is_locked(lock));
+
+ asm volatile(
+ " stlr %w1, [%0]\n"
+ : : "r" (&lock->lock), "r" (0) : "memory");
+}
+
+static always_inline int _raw_spin_trylock(raw_spinlock_t *lock)
+{
+ unsigned int tmp;
+
+ asm volatile(
+ " ldaxr %w0, [%1]\n"
+ " cbnz %w0, 1f\n"
+ " stxr %w0, %w2, [%1]\n"
+ "1:\n"
+ : "=&r" (tmp)
+ : "r" (&lock->lock), "r" (1)
+ : "memory");
+
+ return !tmp;
+}
+
+typedef struct {
+ volatile unsigned int lock;
+} raw_rwlock_t;
+
+#define _RAW_RW_LOCK_UNLOCKED { 0 }
+
+static always_inline int _raw_read_trylock(raw_rwlock_t *rw)
+{
+ unsigned int tmp, tmp2 = 1;
+
+ asm volatile(
+ " ldaxr %w0, [%2]\n"
+ " add %w0, %w0, #1\n"
+ " tbnz %w0, #31, 1f\n"
+ " stxr %w1, %w0, [%2]\n"
+ "1:\n"
+ : "=&r" (tmp), "+r" (tmp2)
+ : "r" (&rw->lock)
+ : "memory");
+
+ return !tmp2;
+}
+
+static always_inline int _raw_write_trylock(raw_rwlock_t *rw)
+{
+ unsigned int tmp;
+
+ asm volatile(
+ " ldaxr %w0, [%1]\n"
+ " cbnz %w0, 1f\n"
+ " stxr %w0, %w2, [%1]\n"
+ "1:\n"
+ : "=&r" (tmp)
+ : "r" (&rw->lock), "r" (0x80000000)
+ : "memory");
+
+ return !tmp;
+}
+
+static inline void _raw_read_unlock(raw_rwlock_t *rw)
+{
+ unsigned int tmp, tmp2;
+
+ asm volatile(
+ "1: ldxr %w0, [%2]\n"
+ " sub %w0, %w0, #1\n"
+ " stlxr %w1, %w0, [%2]\n"
+ " cbnz %w1, 1b\n"
+ : "=&r" (tmp), "=&r" (tmp2)
+ : "r" (&rw->lock)
+ : "memory");
+}
+
+static inline void _raw_write_unlock(raw_rwlock_t *rw)
+{
+ asm volatile(
+ " stlr %w1, [%0]\n"
+ : : "r" (&rw->lock), "r" (0) : "memory");
+}
+
+#define _raw_rw_is_locked(x) ((x)->lock != 0)
+#define _raw_rw_is_write_locked(x) ((x)->lock == 0x80000000)
+
+#endif /* __ASM_SPINLOCK_H */
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/spinlock.h b/xen/include/asm-arm/spinlock.h
index b1825c9..d753210 100644
--- a/xen/include/asm-arm/spinlock.h
+++ b/xen/include/asm-arm/spinlock.h
@@ -4,134 +4,13 @@
#include <xen/config.h>
#include <xen/lib.h>
-static inline void dsb_sev(void)
-{
- __asm__ __volatile__ (
- "dsb\n"
- "sev\n"
- );
-}
-
-typedef struct {
- volatile unsigned int lock;
-} raw_spinlock_t;
-
-#define _RAW_SPIN_LOCK_UNLOCKED { 0 }
-
-#define _raw_spin_is_locked(x) ((x)->lock != 0)
-
-static always_inline void _raw_spin_unlock(raw_spinlock_t *lock)
-{
- ASSERT(_raw_spin_is_locked(lock));
-
- smp_mb();
-
- __asm__ __volatile__(
-" str %1, [%0]\n"
- :
- : "r" (&lock->lock), "r" (0)
- : "cc");
-
- dsb_sev();
-}
-
-static always_inline int _raw_spin_trylock(raw_spinlock_t *lock)
-{
- unsigned long tmp;
-
- __asm__ __volatile__(
-" ldrex %0, [%1]\n"
-" teq %0, #0\n"
-" strexeq %0, %2, [%1]"
- : "=&r" (tmp)
- : "r" (&lock->lock), "r" (1)
- : "cc");
-
- if (tmp == 0) {
- smp_mb();
- return 1;
- } else {
- return 0;
- }
-}
-
-typedef struct {
- volatile unsigned int lock;
-} raw_rwlock_t;
-
-#define _RAW_RW_LOCK_UNLOCKED { 0 }
-
-static always_inline int _raw_read_trylock(raw_rwlock_t *rw)
-{
- unsigned long tmp, tmp2 = 1;
-
- __asm__ __volatile__(
-"1: ldrex %0, [%2]\n"
-" adds %0, %0, #1\n"
-" strexpl %1, %0, [%2]\n"
- : "=&r" (tmp), "+r" (tmp2)
- : "r" (&rw->lock)
- : "cc");
-
- smp_mb();
- return tmp2 == 0;
-}
-
-static always_inline int _raw_write_trylock(raw_rwlock_t *rw)
-{
- unsigned long tmp;
-
- __asm__ __volatile__(
-"1: ldrex %0, [%1]\n"
-" teq %0, #0\n"
-" strexeq %0, %2, [%1]"
- : "=&r" (tmp)
- : "r" (&rw->lock), "r" (0x80000000)
- : "cc");
-
- if (tmp == 0) {
- smp_mb();
- return 1;
- } else {
- return 0;
- }
-}
-
-static inline void _raw_read_unlock(raw_rwlock_t *rw)
-{
- unsigned long tmp, tmp2;
-
- smp_mb();
-
- __asm__ __volatile__(
-"1: ldrex %0, [%2]\n"
-" sub %0, %0, #1\n"
-" strex %1, %0, [%2]\n"
-" teq %1, #0\n"
-" bne 1b"
- : "=&r" (tmp), "=&r" (tmp2)
- : "r" (&rw->lock)
- : "cc");
-
- if (tmp == 0)
- dsb_sev();
-}
-
-static inline void _raw_write_unlock(raw_rwlock_t *rw)
-{
- smp_mb();
-
- __asm__ __volatile__(
- "str %1, [%0]\n"
- :
- : "r" (&rw->lock), "r" (0)
- : "cc");
-
- dsb_sev();
-}
-
-#define _raw_rw_is_locked(x) ((x)->lock != 0)
-#define _raw_rw_is_write_locked(x) ((x)->lock == 0x80000000)
+#if defined(CONFIG_ARM_32)
+# include <asm/arm32/spinlock.h>
+#elif defined(CONFIG_ARM_64)
+# include <asm/arm64/spinlock.h>
+#else
+# error "unknown ARM variant"
+#endif
#endif /* __ASM_SPINLOCK_H */
/*
--
1.7.2.5
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