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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [MINIOS] Refactor spinlock header for multi-arch support.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID b631e7885b5facfff91875e596c98d7b1d5e5fbf
# Parent ba4c40353fff1d5b16bb079472b0ac7345a4ed36
[MINIOS] Refactor spinlock header for multi-arch support.
I separated the spinlock parts special to the x86 architecture and
moved these to include/x86/arch_spinlock.h. The common code is now in
include/spinlock.h.
Signed-off-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>
---
extras/mini-os/include/x86/spinlock.h | 121 -----------------------------
extras/mini-os/include/spinlock.h | 55 +++++++++++++
extras/mini-os/include/x86/arch_spinlock.h | 93 ++++++++++++++++++++++
3 files changed, 148 insertions(+), 121 deletions(-)
diff -r ba4c40353fff -r b631e7885b5f extras/mini-os/include/spinlock.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/include/spinlock.h Fri Nov 17 09:18:28 2006 +0000
@@ -0,0 +1,55 @@
+#ifndef __ASM_SPINLOCK_H
+#define __ASM_SPINLOCK_H
+
+#include <lib.h>
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+ volatile unsigned int slock;
+} spinlock_t;
+
+
+#include "arch_spinlock.h"
+
+
+#define SPINLOCK_MAGIC 0xdead4ead
+
+#define SPIN_LOCK_UNLOCKED ARCH_SPIN_LOCK_UNLOCKED
+
+#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } 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.
+ */
+
+#define spin_is_locked(x) arch_spin_is_locked(x)
+
+#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x))
+
+
+#define _spin_trylock(lock) ({_raw_spin_trylock(lock) ? \
+ 1 : ({ 0;});})
+
+#define _spin_lock(lock) \
+do { \
+ _raw_spin_lock(lock); \
+} while(0)
+
+#define _spin_unlock(lock) \
+do { \
+ _raw_spin_unlock(lock); \
+} while (0)
+
+
+#define spin_lock(lock) _spin_lock(lock)
+#define spin_unlock(lock) _spin_unlock(lock)
+
+#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
+
+#endif
diff -r ba4c40353fff -r b631e7885b5f extras/mini-os/include/x86/arch_spinlock.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/include/x86/arch_spinlock.h Fri Nov 17 09:18:28
2006 +0000
@@ -0,0 +1,93 @@
+
+
+#ifndef __ARCH_ASM_SPINLOCK_H
+#define __ARCH_ASM_SPINLOCK_H
+
+#include <lib.h>
+
+
+#define ARCH_SPIN_LOCK_UNLOCKED (spinlock_t) { 1 }
+
+/*
+ * 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) (*(volatile signed char *)(&(x)->slock) <= 0)
+#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x))
+
+#define spin_lock_string \
+ "1:\n" \
+ LOCK \
+ "decb %0\n\t" \
+ "jns 3f\n" \
+ "2:\t" \
+ "rep;nop\n\t" \
+ "cmpb $0,%0\n\t" \
+ "jle 2b\n\t" \
+ "jmp 1b\n" \
+ "3:\n\t"
+
+#define spin_lock_string_flags \
+ "1:\n" \
+ LOCK \
+ "decb %0\n\t" \
+ "jns 4f\n\t" \
+ "2:\t" \
+ "testl $0x200, %1\n\t" \
+ "jz 3f\n\t" \
+ "#sti\n\t" \
+ "3:\t" \
+ "rep;nop\n\t" \
+ "cmpb $0, %0\n\t" \
+ "jle 3b\n\t" \
+ "#cli\n\t" \
+ "jmp 1b\n" \
+ "4:\n\t"
+
+/*
+ * This works. Despite all the confusion.
+ * (except on PPro SMP or if we are using OOSTORE)
+ * (PPro errata 66, 92)
+ */
+
+#define spin_unlock_string \
+ "xchgb %b0, %1" \
+ :"=q" (oldval), "=m" (lock->slock) \
+ :"0" (oldval) : "memory"
+
+static inline void _raw_spin_unlock(spinlock_t *lock)
+{
+ char oldval = 1;
+ __asm__ __volatile__(
+ spin_unlock_string
+ );
+}
+
+static inline int _raw_spin_trylock(spinlock_t *lock)
+{
+ char oldval;
+ __asm__ __volatile__(
+ "xchgb %b0,%1\n"
+ :"=q" (oldval), "=m" (lock->slock)
+ :"0" (0) : "memory");
+ return oldval > 0;
+}
+
+static inline void _raw_spin_lock(spinlock_t *lock)
+{
+ __asm__ __volatile__(
+ spin_lock_string
+ :"=m" (lock->slock) : : "memory");
+}
+
+static inline void _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags)
+{
+ __asm__ __volatile__(
+ spin_lock_string_flags
+ :"=m" (lock->slock) : "r" (flags) : "memory");
+}
+
+#endif
diff -r ba4c40353fff -r b631e7885b5f extras/mini-os/include/x86/spinlock.h
--- a/extras/mini-os/include/x86/spinlock.h Fri Nov 17 09:16:51 2006 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,121 +0,0 @@
-#ifndef __ASM_SPINLOCK_H
-#define __ASM_SPINLOCK_H
-
-#include <lib.h>
-
-/*
- * Your basic SMP spinlocks, allowing only a single CPU anywhere
- */
-
-typedef struct {
- volatile unsigned int slock;
-} spinlock_t;
-
-#define SPINLOCK_MAGIC 0xdead4ead
-
-#define SPIN_LOCK_UNLOCKED (spinlock_t) { 1 }
-
-#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } 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.
- */
-
-#define spin_is_locked(x) (*(volatile signed char *)(&(x)->slock) <= 0)
-#define spin_unlock_wait(x) do { barrier(); } while(spin_is_locked(x))
-
-#define spin_lock_string \
- "1:\n" \
- LOCK \
- "decb %0\n\t" \
- "jns 3f\n" \
- "2:\t" \
- "rep;nop\n\t" \
- "cmpb $0,%0\n\t" \
- "jle 2b\n\t" \
- "jmp 1b\n" \
- "3:\n\t"
-
-#define spin_lock_string_flags \
- "1:\n" \
- LOCK \
- "decb %0\n\t" \
- "jns 4f\n\t" \
- "2:\t" \
- "testl $0x200, %1\n\t" \
- "jz 3f\n\t" \
- "#sti\n\t" \
- "3:\t" \
- "rep;nop\n\t" \
- "cmpb $0, %0\n\t" \
- "jle 3b\n\t" \
- "#cli\n\t" \
- "jmp 1b\n" \
- "4:\n\t"
-
-/*
- * This works. Despite all the confusion.
- * (except on PPro SMP or if we are using OOSTORE)
- * (PPro errata 66, 92)
- */
-
-#define spin_unlock_string \
- "xchgb %b0, %1" \
- :"=q" (oldval), "=m" (lock->slock) \
- :"0" (oldval) : "memory"
-
-static inline void _raw_spin_unlock(spinlock_t *lock)
-{
- char oldval = 1;
- __asm__ __volatile__(
- spin_unlock_string
- );
-}
-
-static inline int _raw_spin_trylock(spinlock_t *lock)
-{
- char oldval;
- __asm__ __volatile__(
- "xchgb %b0,%1\n"
- :"=q" (oldval), "=m" (lock->slock)
- :"0" (0) : "memory");
- return oldval > 0;
-}
-
-static inline void _raw_spin_lock(spinlock_t *lock)
-{
- __asm__ __volatile__(
- spin_lock_string
- :"=m" (lock->slock) : : "memory");
-}
-
-static inline void _raw_spin_lock_flags (spinlock_t *lock, unsigned long flags)
-{
- __asm__ __volatile__(
- spin_lock_string_flags
- :"=m" (lock->slock) : "r" (flags) : "memory");
-}
-
-#define _spin_trylock(lock) ({_raw_spin_trylock(lock) ? \
- 1 : ({ 0;});})
-
-#define _spin_lock(lock) \
-do { \
- _raw_spin_lock(lock); \
-} while(0)
-
-#define _spin_unlock(lock) \
-do { \
- _raw_spin_unlock(lock); \
-} while (0)
-
-
-#define spin_lock(lock) _spin_lock(lock)
-#define spin_unlock(lock) _spin_unlock(lock)
-
-#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
-
-#endif
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