Linux-2.6.12-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, 380 insertions, 0 deletions

diff --git a/include/asm-m32r/spinlock.h b/include/asm-m32r/spinlock.h
new file mode 100644
index 0000000..6608d83
--- /dev/null
+++ b/include/asm-m32r/spinlock.h
@@ -0,0 +1,380 @@
+#ifndef _ASM_M32R_SPINLOCK_H
+#define _ASM_M32R_SPINLOCK_H
+
+/*
+ *  linux/include/asm-m32r/spinlock.h
+ *
+ *  M32R version:
+ *    Copyright (C) 2001, 2002  Hitoshi Yamamoto
+ *    Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ */
+
+#include <linux/config.h>	/* CONFIG_DEBUG_SPINLOCK, CONFIG_SMP */
+#include <linux/compiler.h>
+#include <asm/atomic.h>
+#include <asm/page.h>
+
+extern int printk(const char * fmt, ...)
+	__attribute__ ((format (printf, 1, 2)));
+
+#define RW_LOCK_BIAS		 0x01000000
+#define RW_LOCK_BIAS_STR	"0x01000000"
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+	volatile int slock;
+#ifdef CONFIG_DEBUG_SPINLOCK
+	unsigned magic;
+#endif
+#ifdef CONFIG_PREEMPT
+	unsigned int break_lock;
+#endif
+} spinlock_t;
+
+#define SPINLOCK_MAGIC	0xdead4ead
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+#define SPINLOCK_MAGIC_INIT	, SPINLOCK_MAGIC
+#else
+#define SPINLOCK_MAGIC_INIT	/* */
+#endif
+
+#define SPIN_LOCK_UNLOCKED (spinlock_t) { 1 SPINLOCK_MAGIC_INIT }
+
+#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 int *)(&(x)->slock) <= 0)
+#define spin_unlock_wait(x)	do { barrier(); } while(spin_is_locked(x))
+#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
+
+/**
+ * _raw_spin_trylock - Try spin lock and return a result
+ * @lock: Pointer to the lock variable
+ *
+ * _raw_spin_trylock() tries to get the lock and returns a result.
+ * On the m32r, the result value is 1 (= Success) or 0 (= Failure).
+ */
+static inline int _raw_spin_trylock(spinlock_t *lock)
+{
+	int oldval;
+	unsigned long tmp1, tmp2;
+
+	/*
+	 * lock->slock :  =1 : unlock
+	 *             : <=0 : lock
+	 * {
+	 *   oldval = lock->slock; <--+ need atomic operation
+	 *   lock->slock = 0;      <--+
+	 * }
+	 */
+	__asm__ __volatile__ (
+		"# spin_trylock			\n\t"
+		"ldi	%1, #0;			\n\t"
+		"mvfc	%2, psw;		\n\t"
+		"clrpsw	#0x40 -> nop;		\n\t"
+		DCACHE_CLEAR("%0", "r6", "%3")
+		"lock	%0, @%3;		\n\t"
+		"unlock	%1, @%3;		\n\t"
+		"mvtc	%2, psw;		\n\t"
+		: "=&r" (oldval), "=&r" (tmp1), "=&r" (tmp2)
+		: "r" (&lock->slock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r6"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+
+	return (oldval > 0);
+}
+
+static inline void _raw_spin_lock(spinlock_t *lock)
+{
+	unsigned long tmp0, tmp1;
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+	if (unlikely(lock->magic != SPINLOCK_MAGIC)) {
+		printk("pc: %p\n", __builtin_return_address(0));
+		BUG();
+	}
+#endif
+	/*
+	 * lock->slock :  =1 : unlock
+	 *             : <=0 : lock
+	 *
+	 * for ( ; ; ) {
+	 *   lock->slock -= 1;  <-- need atomic operation
+	 *   if (lock->slock == 0) break;
+	 *   for ( ; lock->slock <= 0 ; );
+	 * }
+	 */
+	__asm__ __volatile__ (
+		"# spin_lock			\n\t"
+		".fillinsn			\n"
+		"1:				\n\t"
+		"mvfc	%1, psw;		\n\t"
+		"clrpsw	#0x40 -> nop;		\n\t"
+		DCACHE_CLEAR("%0", "r6", "%2")
+		"lock	%0, @%2;		\n\t"
+		"addi	%0, #-1;		\n\t"
+		"unlock	%0, @%2;		\n\t"
+		"mvtc	%1, psw;		\n\t"
+		"bltz	%0, 2f;			\n\t"
+		LOCK_SECTION_START(".balign 4 \n\t")
+		".fillinsn			\n"
+		"2:				\n\t"
+		"ld	%0, @%2;		\n\t"
+		"bgtz	%0, 1b;			\n\t"
+		"bra	2b;			\n\t"
+		LOCK_SECTION_END
+		: "=&r" (tmp0), "=&r" (tmp1)
+		: "r" (&lock->slock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r6"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+}
+
+static inline void _raw_spin_unlock(spinlock_t *lock)
+{
+#ifdef CONFIG_DEBUG_SPINLOCK
+	BUG_ON(lock->magic != SPINLOCK_MAGIC);
+	BUG_ON(!spin_is_locked(lock));
+#endif
+	mb();
+	lock->slock = 1;
+}
+
+/*
+ * 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.
+ */
+typedef struct {
+	volatile int lock;
+#ifdef CONFIG_DEBUG_SPINLOCK
+	unsigned magic;
+#endif
+#ifdef CONFIG_PREEMPT
+	unsigned int break_lock;
+#endif
+} rwlock_t;
+
+#define RWLOCK_MAGIC	0xdeaf1eed
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+#define RWLOCK_MAGIC_INIT	, RWLOCK_MAGIC
+#else
+#define RWLOCK_MAGIC_INIT	/* */
+#endif
+
+#define RW_LOCK_UNLOCKED (rwlock_t) { RW_LOCK_BIAS RWLOCK_MAGIC_INIT }
+
+#define rwlock_init(x)	do { *(x) = RW_LOCK_UNLOCKED; } while(0)
+
+/**
+ * read_can_lock - would read_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define read_can_lock(x) ((int)(x)->lock > 0)
+
+/**
+ * write_can_lock - would write_trylock() succeed?
+ * @lock: the rwlock in question.
+ */
+#define write_can_lock(x) ((x)->lock == RW_LOCK_BIAS)
+
+/*
+ * On x86, we implement read-write locks as a 32-bit counter
+ * with the high bit (sign) being the "contended" bit.
+ *
+ * The inline assembly is non-obvious. Think about it.
+ *
+ * Changed to use the same technique as rw semaphores.  See
+ * semaphore.h for details.  -ben
+ */
+/* the spinlock helpers are in arch/i386/kernel/semaphore.c */
+
+static inline void _raw_read_lock(rwlock_t *rw)
+{
+	unsigned long tmp0, tmp1;
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+	BUG_ON(rw->magic != RWLOCK_MAGIC);
+#endif
+	/*
+	 * rw->lock :  >0 : unlock
+	 *          : <=0 : lock
+	 *
+	 * for ( ; ; ) {
+	 *   rw->lock -= 1;  <-- need atomic operation
+	 *   if (rw->lock >= 0) break;
+	 *   rw->lock += 1;  <-- need atomic operation
+	 *   for ( ; rw->lock <= 0 ; );
+	 * }
+	 */
+	__asm__ __volatile__ (
+		"# read_lock			\n\t"
+		".fillinsn			\n"
+		"1:				\n\t"
+		"mvfc	%1, psw;		\n\t"
+		"clrpsw	#0x40 -> nop;		\n\t"
+		DCACHE_CLEAR("%0", "r6", "%2")
+		"lock	%0, @%2;		\n\t"
+		"addi	%0, #-1;		\n\t"
+		"unlock	%0, @%2;		\n\t"
+		"mvtc	%1, psw;		\n\t"
+		"bltz	%0, 2f;			\n\t"
+		LOCK_SECTION_START(".balign 4 \n\t")
+		".fillinsn			\n"
+		"2:				\n\t"
+		"clrpsw	#0x40 -> nop;		\n\t"
+		DCACHE_CLEAR("%0", "r6", "%2")
+		"lock	%0, @%2;		\n\t"
+		"addi	%0, #1;			\n\t"
+		"unlock	%0, @%2;		\n\t"
+		"mvtc	%1, psw;		\n\t"
+		".fillinsn			\n"
+		"3:				\n\t"
+		"ld	%0, @%2;		\n\t"
+		"bgtz	%0, 1b;			\n\t"
+		"bra	3b;			\n\t"
+		LOCK_SECTION_END
+		: "=&r" (tmp0), "=&r" (tmp1)
+		: "r" (&rw->lock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r6"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+}
+
+static inline void _raw_write_lock(rwlock_t *rw)
+{
+	unsigned long tmp0, tmp1, tmp2;
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+	BUG_ON(rw->magic != RWLOCK_MAGIC);
+#endif
+	/*
+	 * rw->lock :  =RW_LOCK_BIAS_STR : unlock
+	 *          : !=RW_LOCK_BIAS_STR : lock
+	 *
+	 * for ( ; ; ) {
+	 *   rw->lock -= RW_LOCK_BIAS_STR;  <-- need atomic operation
+	 *   if (rw->lock == 0) break;
+	 *   rw->lock += RW_LOCK_BIAS_STR;  <-- need atomic operation
+	 *   for ( ; rw->lock != RW_LOCK_BIAS_STR ; ) ;
+	 * }
+	 */
+	__asm__ __volatile__ (
+		"# write_lock					\n\t"
+		"seth	%1, #high(" RW_LOCK_BIAS_STR ");	\n\t"
+		"or3	%1, %1, #low(" RW_LOCK_BIAS_STR ");	\n\t"
+		".fillinsn					\n"
+		"1:						\n\t"
+		"mvfc	%2, psw;				\n\t"
+		"clrpsw	#0x40 -> nop;				\n\t"
+		DCACHE_CLEAR("%0", "r7", "%3")
+		"lock	%0, @%3;				\n\t"
+		"sub	%0, %1;					\n\t"
+		"unlock	%0, @%3;				\n\t"
+		"mvtc	%2, psw;				\n\t"
+		"bnez	%0, 2f;					\n\t"
+		LOCK_SECTION_START(".balign 4 \n\t")
+		".fillinsn					\n"
+		"2:						\n\t"
+		"clrpsw	#0x40 -> nop;				\n\t"
+		DCACHE_CLEAR("%0", "r7", "%3")
+		"lock	%0, @%3;				\n\t"
+		"add	%0, %1;					\n\t"
+		"unlock	%0, @%3;				\n\t"
+		"mvtc	%2, psw;				\n\t"
+		".fillinsn					\n"
+		"3:						\n\t"
+		"ld	%0, @%3;				\n\t"
+		"beq	%0, %1, 1b;				\n\t"
+		"bra	3b;					\n\t"
+		LOCK_SECTION_END
+		: "=&r" (tmp0), "=&r" (tmp1), "=&r" (tmp2)
+		: "r" (&rw->lock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r7"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+}
+
+static inline void _raw_read_unlock(rwlock_t *rw)
+{
+	unsigned long tmp0, tmp1;
+
+	__asm__ __volatile__ (
+		"# read_unlock			\n\t"
+		"mvfc	%1, psw;		\n\t"
+		"clrpsw	#0x40 -> nop;		\n\t"
+		DCACHE_CLEAR("%0", "r6", "%2")
+		"lock	%0, @%2;		\n\t"
+		"addi	%0, #1;			\n\t"
+		"unlock	%0, @%2;		\n\t"
+		"mvtc	%1, psw;		\n\t"
+		: "=&r" (tmp0), "=&r" (tmp1)
+		: "r" (&rw->lock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r6"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+}
+
+static inline void _raw_write_unlock(rwlock_t *rw)
+{
+	unsigned long tmp0, tmp1, tmp2;
+
+	__asm__ __volatile__ (
+		"# write_unlock					\n\t"
+		"seth	%1, #high(" RW_LOCK_BIAS_STR ");	\n\t"
+		"or3	%1, %1, #low(" RW_LOCK_BIAS_STR ");	\n\t"
+		"mvfc	%2, psw;				\n\t"
+		"clrpsw	#0x40 -> nop;				\n\t"
+		DCACHE_CLEAR("%0", "r7", "%3")
+		"lock	%0, @%3;				\n\t"
+		"add	%0, %1;					\n\t"
+		"unlock	%0, @%3;				\n\t"
+		"mvtc	%2, psw;				\n\t"
+		: "=&r" (tmp0), "=&r" (tmp1), "=&r" (tmp2)
+		: "r" (&rw->lock)
+		: "memory"
+#ifdef CONFIG_CHIP_M32700_TS1
+		, "r7"
+#endif	/* CONFIG_CHIP_M32700_TS1 */
+	);
+}
+
+#define _raw_read_trylock(lock) generic_raw_read_trylock(lock)
+
+static inline int _raw_write_trylock(rwlock_t *lock)
+{
+	atomic_t *count = (atomic_t *)lock;
+	if (atomic_sub_and_test(RW_LOCK_BIAS, count))
+		return 1;
+	atomic_add(RW_LOCK_BIAS, count);
+	return 0;
+}
+
+#endif	/* _ASM_M32R_SPINLOCK_H */