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!
diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h
new file mode 100644
index 0000000..874a6f8
--- /dev/null
+++ b/include/asm-ia64/atomic.h
@@ -0,0 +1,183 @@
+#ifndef _ASM_IA64_ATOMIC_H
+#define _ASM_IA64_ATOMIC_H
+
+/*
+ * Atomic operations that C can't guarantee us. Useful for
+ * resource counting etc..
+ *
+ * NOTE: don't mess with the types below! The "unsigned long" and
+ * "int" types were carefully placed so as to ensure proper operation
+ * of the macros.
+ *
+ * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+#include <linux/types.h>
+
+#include <asm/intrinsics.h>
+
+/*
+ * On IA-64, counter must always be volatile to ensure that that the
+ * memory accesses are ordered.
+ */
+typedef struct { volatile __s32 counter; } atomic_t;
+typedef struct { volatile __s64 counter; } atomic64_t;
+
+#define ATOMIC_INIT(i) ((atomic_t) { (i) })
+#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
+
+#define atomic_read(v) ((v)->counter)
+#define atomic64_read(v) ((v)->counter)
+
+#define atomic_set(v,i) (((v)->counter) = (i))
+#define atomic64_set(v,i) (((v)->counter) = (i))
+
+static __inline__ int
+ia64_atomic_add (int i, atomic_t *v)
+{
+ __s32 old, new;
+ CMPXCHG_BUGCHECK_DECL
+
+ do {
+ CMPXCHG_BUGCHECK(v);
+ old = atomic_read(v);
+ new = old + i;
+ } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
+ return new;
+}
+
+static __inline__ int
+ia64_atomic64_add (__s64 i, atomic64_t *v)
+{
+ __s64 old, new;
+ CMPXCHG_BUGCHECK_DECL
+
+ do {
+ CMPXCHG_BUGCHECK(v);
+ old = atomic_read(v);
+ new = old + i;
+ } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
+ return new;
+}
+
+static __inline__ int
+ia64_atomic_sub (int i, atomic_t *v)
+{
+ __s32 old, new;
+ CMPXCHG_BUGCHECK_DECL
+
+ do {
+ CMPXCHG_BUGCHECK(v);
+ old = atomic_read(v);
+ new = old - i;
+ } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
+ return new;
+}
+
+static __inline__ int
+ia64_atomic64_sub (__s64 i, atomic64_t *v)
+{
+ __s64 old, new;
+ CMPXCHG_BUGCHECK_DECL
+
+ do {
+ CMPXCHG_BUGCHECK(v);
+ old = atomic_read(v);
+ new = old - i;
+ } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
+ return new;
+}
+
+#define atomic_add_return(i,v) \
+({ \
+ int __ia64_aar_i = (i); \
+ (__builtin_constant_p(i) \
+ && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
+ || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
+ || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
+ || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
+ ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
+ : ia64_atomic_add(__ia64_aar_i, v); \
+})
+
+#define atomic64_add_return(i,v) \
+({ \
+ long __ia64_aar_i = (i); \
+ (__builtin_constant_p(i) \
+ && ( (__ia64_aar_i == 1) || (__ia64_aar_i == 4) \
+ || (__ia64_aar_i == 8) || (__ia64_aar_i == 16) \
+ || (__ia64_aar_i == -1) || (__ia64_aar_i == -4) \
+ || (__ia64_aar_i == -8) || (__ia64_aar_i == -16))) \
+ ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
+ : ia64_atomic64_add(__ia64_aar_i, v); \
+})
+
+/*
+ * Atomically add I to V and return TRUE if the resulting value is
+ * negative.
+ */
+static __inline__ int
+atomic_add_negative (int i, atomic_t *v)
+{
+ return atomic_add_return(i, v) < 0;
+}
+
+static __inline__ int
+atomic64_add_negative (__s64 i, atomic64_t *v)
+{
+ return atomic64_add_return(i, v) < 0;
+}
+
+#define atomic_sub_return(i,v) \
+({ \
+ int __ia64_asr_i = (i); \
+ (__builtin_constant_p(i) \
+ && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
+ || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
+ || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
+ || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
+ ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
+ : ia64_atomic_sub(__ia64_asr_i, v); \
+})
+
+#define atomic64_sub_return(i,v) \
+({ \
+ long __ia64_asr_i = (i); \
+ (__builtin_constant_p(i) \
+ && ( (__ia64_asr_i == 1) || (__ia64_asr_i == 4) \
+ || (__ia64_asr_i == 8) || (__ia64_asr_i == 16) \
+ || (__ia64_asr_i == -1) || (__ia64_asr_i == -4) \
+ || (__ia64_asr_i == -8) || (__ia64_asr_i == -16))) \
+ ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
+ : ia64_atomic64_sub(__ia64_asr_i, v); \
+})
+
+#define atomic_dec_return(v) atomic_sub_return(1, (v))
+#define atomic_inc_return(v) atomic_add_return(1, (v))
+#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
+#define atomic64_inc_return(v) atomic64_add_return(1, (v))
+
+#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
+#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
+#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
+#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
+#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
+#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
+
+#define atomic_add(i,v) atomic_add_return((i), (v))
+#define atomic_sub(i,v) atomic_sub_return((i), (v))
+#define atomic_inc(v) atomic_add(1, (v))
+#define atomic_dec(v) atomic_sub(1, (v))
+
+#define atomic64_add(i,v) atomic64_add_return((i), (v))
+#define atomic64_sub(i,v) atomic64_sub_return((i), (v))
+#define atomic64_inc(v) atomic64_add(1, (v))
+#define atomic64_dec(v) atomic64_sub(1, (v))
+
+/* Atomic operations are already serializing */
+#define smp_mb__before_atomic_dec() barrier()
+#define smp_mb__after_atomic_dec() barrier()
+#define smp_mb__before_atomic_inc() barrier()
+#define smp_mb__after_atomic_inc() barrier()
+
+#endif /* _ASM_IA64_ATOMIC_H */