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-rw-r--r--arch/mips/atomic.h191
1 files changed, 191 insertions, 0 deletions
diff --git a/arch/mips/atomic.h b/arch/mips/atomic.h
new file mode 100644
index 00000000..33e53d4e
--- /dev/null
+++ b/arch/mips/atomic.h
@@ -0,0 +1,191 @@
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
+
+#include <stdint.h>
+
+static inline int a_ctz_l(unsigned long x)
+{
+ static const char debruijn32[32] = {
+ 0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
+ 31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
+ };
+ return debruijn32[(x&-x)*0x076be629 >> 27];
+}
+
+static inline int a_ctz_64(uint64_t x)
+{
+ uint32_t y = x;
+ if (!y) {
+ y = x>>32;
+ return 32 + a_ctz_l(y);
+ }
+ return a_ctz_l(y);
+}
+
+static inline int a_cas(volatile int *p, int t, int s)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%2)\n"
+ " bne %0, %3, 1f\n"
+ " addu %1, %4, $0\n"
+ " sc %1, 0(%2)\n"
+ " beq %1, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(t), "=&r"(dummy) : "r"(p), "r"(t), "r"(s) : "memory" );
+ return t;
+}
+
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+ return (void *)a_cas(p, (int)t, (int)s);
+}
+
+static inline long a_cas_l(volatile void *p, long t, long s)
+{
+ return a_cas(p, t, s);
+}
+
+
+static inline int a_swap(volatile int *x, int v)
+{
+ int old, dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%2)\n"
+ " addu %1, %3, $0\n"
+ " sc %1, 0(%2)\n"
+ " beq %1, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(old), "=&r"(dummy) : "r"(x), "r"(v) : "memory" );
+ return old;
+}
+
+static inline int a_fetch_add(volatile int *x, int v)
+{
+ int new;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " addu %0, %0, %2\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(new) : "r"(x), "r"(v) : "memory" );
+ return new-v;
+}
+
+static inline void a_inc(volatile int *x)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " addu %0, %0, 1\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(dummy) : "r"(x) : "memory" );
+}
+
+static inline void a_dec(volatile int *x)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " subu %0, %0, 1\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(dummy) : "r"(x) : "memory" );
+}
+
+static inline void a_store(volatile int *p, int x)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " addu %0, %2, $0\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(dummy) : "r"(p), "r"(x) : "memory" );
+}
+
+static inline void a_spin()
+{
+}
+
+static inline void a_crash()
+{
+ *(volatile char *)0=0;
+}
+
+static inline void a_and(volatile int *p, int v)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " and %0, %0, %2\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
+}
+
+static inline void a_or(volatile int *p, int v)
+{
+ int dummy;
+ __asm__ __volatile__(
+ ".set push\n"
+ ".set noreorder\n"
+ "1: ll %0, 0(%1)\n"
+ " or %0, %0, %2\n"
+ " sc %0, 0(%1)\n"
+ " beq %0, $0, 1b\n"
+ " nop\n"
+ "1: \n"
+ ".set pop\n"
+ : "=&r"(dummy) : "r"(p), "r"(v) : "memory" );
+}
+
+static inline void a_and_64(volatile uint64_t *p, uint64_t v)
+{
+ union { uint64_t v; uint32_t r[2]; } u = { v };
+ a_and((int *)p, u.r[0]);
+ a_and((int *)p+1, u.r[1]);
+}
+
+static inline void a_or_64(volatile uint64_t *p, uint64_t v)
+{
+ union { uint64_t v; uint32_t r[2]; } u = { v };
+ a_or((int *)p, u.r[0]);
+ a_or((int *)p+1, u.r[1]);
+}
+
+#endif