Linux-2.6.12-rc2v2.6.12-rc2

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!

1 files changed, 205 insertions, 0 deletions

diff --git a/include/asm-m32r/semaphore.h b/include/asm-m32r/semaphore.h
new file mode 100644
index 000000000000..53e3c60f21ec
--- /dev/null
+++ b/include/asm-m32r/semaphore.h
@@ -0,0 +1,205 @@
+#ifndef _ASM_M32R_SEMAPHORE_H
+#define _ASM_M32R_SEMAPHORE_H
+
+#include <linux/linkage.h>
+
+#ifdef __KERNEL__
+
+/*
+ * SMP- and interrupt-safe semaphores..
+ *
+ * Copyright (C) 1996  Linus Torvalds
+ * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ */
+
+#include <linux/config.h>
+#include <linux/wait.h>
+#include <linux/rwsem.h>
+#include <asm/assembler.h>
+#include <asm/system.h>
+#include <asm/atomic.h>
+
+struct semaphore {
+        atomic_t count;
+        int sleepers;
+        wait_queue_head_t wait;
+};
+
+#define __SEMAPHORE_INITIALIZER(name, n)                                \
+{                                                                       \
+        .count          = ATOMIC_INIT(n),                               \
+        .sleepers       = 0,                                            \
+        .wait           = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait)    \
+}
+
+#define __MUTEX_INITIALIZER(name) \
+        __SEMAPHORE_INITIALIZER(name,1)
+
+#define __DECLARE_SEMAPHORE_GENERIC(name,count) \
+        struct semaphore name = __SEMAPHORE_INITIALIZER(name,count)
+
+#define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC(name,1)
+#define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC(name,0)
+
+static inline void sema_init (struct semaphore *sem, int val)
+{
+/*
+ *      *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
+ *
+ * i'd rather use the more flexible initialization above, but sadly
+ * GCC 2.7.2.3 emits a bogus warning. EGCS doesnt. Oh well.
+ */
+        atomic_set(&sem->count, val);
+        sem->sleepers = 0;
+        init_waitqueue_head(&sem->wait);
+}
+
+static inline void init_MUTEX (struct semaphore *sem)
+{
+        sema_init(sem, 1);
+}
+
+static inline void init_MUTEX_LOCKED (struct semaphore *sem)
+{
+        sema_init(sem, 0);
+}
+
+asmlinkage void __down_failed(void /* special register calling convention */);
+asmlinkage int  __down_failed_interruptible(void  /* params in registers */);
+asmlinkage int  __down_failed_trylock(void  /* params in registers */);
+asmlinkage void __up_wakeup(void /* special register calling convention */);
+
+asmlinkage void __down(struct semaphore * sem);
+asmlinkage int  __down_interruptible(struct semaphore * sem);
+asmlinkage int  __down_trylock(struct semaphore * sem);
+asmlinkage void __up(struct semaphore * sem);
+
+/*
+ * Atomically decrement the semaphore's count.  If it goes negative,
+ * block the calling thread in the TASK_UNINTERRUPTIBLE state.
+ */
+static inline void down(struct semaphore * sem)
+{
+        unsigned long flags;
+        long count;
+
+        might_sleep();
+        local_irq_save(flags);
+        __asm__ __volatile__ (
+                "# down                         \n\t"
+                DCACHE_CLEAR("%0", "r4", "%1")
+                M32R_LOCK" %0, @%1;             \n\t"
+                "addi   %0, #-1;                \n\t"
+                M32R_UNLOCK" %0, @%1;           \n\t"
+                : "=&r" (count)
+                : "r" (&sem->count)
+                : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                , "r4"
+#endif  /* CONFIG_CHIP_M32700_TS1 */
+        );
+        local_irq_restore(flags);
+
+        if (unlikely(count < 0))
+                __down(sem);
+}
+
+/*
+ * Interruptible try to acquire a semaphore.  If we obtained
+ * it, return zero.  If we were interrupted, returns -EINTR
+ */
+static inline int down_interruptible(struct semaphore * sem)
+{
+        unsigned long flags;
+        long count;
+        int result = 0;
+
+        might_sleep();
+        local_irq_save(flags);
+        __asm__ __volatile__ (
+                "# down_interruptible           \n\t"
+                DCACHE_CLEAR("%0", "r4", "%1")
+                M32R_LOCK" %0, @%1;             \n\t"
+                "addi   %0, #-1;                \n\t"
+                M32R_UNLOCK" %0, @%1;           \n\t"
+                : "=&r" (count)
+                : "r" (&sem->count)
+                : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                , "r4"
+#endif  /* CONFIG_CHIP_M32700_TS1 */
+        );
+        local_irq_restore(flags);
+
+        if (unlikely(count < 0))
+                result = __down_interruptible(sem);
+
+        return result;
+}
+
+/*
+ * Non-blockingly attempt to down() a semaphore.
+ * Returns zero if we acquired it
+ */
+static inline int down_trylock(struct semaphore * sem)
+{
+        unsigned long flags;
+        long count;
+        int result = 0;
+
+        local_irq_save(flags);
+        __asm__ __volatile__ (
+                "# down_trylock                 \n\t"
+                DCACHE_CLEAR("%0", "r4", "%1")
+                M32R_LOCK" %0, @%1;             \n\t"
+                "addi   %0, #-1;                \n\t"
+                M32R_UNLOCK" %0, @%1;           \n\t"
+                : "=&r" (count)
+                : "r" (&sem->count)
+                : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                , "r4"
+#endif  /* CONFIG_CHIP_M32700_TS1 */
+        );
+        local_irq_restore(flags);
+
+        if (unlikely(count < 0))
+                result = __down_trylock(sem);
+
+        return result;
+}
+
+/*
+ * Note! This is subtle. We jump to wake people up only if
+ * the semaphore was negative (== somebody was waiting on it).
+ * The default case (no contention) will result in NO
+ * jumps for both down() and up().
+ */
+static inline void up(struct semaphore * sem)
+{
+        unsigned long flags;
+        long count;
+
+        local_irq_save(flags);
+        __asm__ __volatile__ (
+                "# up                           \n\t"
+                DCACHE_CLEAR("%0", "r4", "%1")
+                M32R_LOCK" %0, @%1;             \n\t"
+                "addi   %0, #1;                 \n\t"
+                M32R_UNLOCK" %0, @%1;           \n\t"
+                : "=&r" (count)
+                : "r" (&sem->count)
+                : "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+                , "r4"
+#endif  /* CONFIG_CHIP_M32700_TS1 */
+        );
+        local_irq_restore(flags);
+
+        if (unlikely(count <= 0))
+                __up(sem);
+}
+
+#endif  /* __KERNEL__ */
+
+#endif  /* _ASM_M32R_SEMAPHORE_H */