Author: andrew
Date: Fri Jul 31 13:34:43 2015
New Revision: 286128
URL: https://svnweb.freebsd.org/changeset/base/286128
Log:
Add more atomic_swap_* functions.
Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/arm64/include/atomic.h
Modified: head/sys/arm64/include/atomic.h
==============================================================================
--- head/sys/arm64/include/atomic.h Fri Jul 31 13:32:25 2015
(r286127)
+++ head/sys/arm64/include/atomic.h Fri Jul 31 13:34:43 2015
(r286128)
@@ -153,6 +153,22 @@ atomic_set_32(volatile uint32_t *p, uint
);
}
+static __inline uint32_t
+atomic_swap_32(volatile uint32_t *p, uint32_t val)
+{
+ uint32_t tmp;
+ int res;
+
+ __asm __volatile(
+ "1: ldxr %w0, [%2] \n"
+ " stxr %w1, %w3, [%2] \n"
+ " cbnz %w1, 1b \n"
+ : "=&r"(tmp), "=&r"(res), "+r" (p), "+r" (val) : : "cc", "memory"
+ );
+
+ return (tmp);
+}
+
static __inline void
atomic_subtract_32(volatile uint32_t *p, uint32_t val)
{
@@ -174,6 +190,7 @@ atomic_subtract_32(volatile uint32_t *p,
#define atomic_fetchadd_int atomic_fetchadd_32
#define atomic_readandclear_int atomic_readandclear_32
#define atomic_set_int atomic_set_32
+#define atomic_swap_int atomic_swap_32
#define atomic_subtract_int atomic_subtract_32
static __inline void
@@ -515,6 +532,7 @@ atomic_swap_64(volatile uint64_t *p, uin
#define atomic_fetchadd_long atomic_fetchadd_64
#define atomic_readandclear_long atomic_readandclear_64
#define atomic_set_long atomic_set_64
+#define atomic_swap_long atomic_swap_64
#define atomic_subtract_long atomic_subtract_64
#define atomic_add_ptr atomic_add_64
@@ -523,6 +541,7 @@ atomic_swap_64(volatile uint64_t *p, uin
#define atomic_fetchadd_ptr atomic_fetchadd_64
#define atomic_readandclear_ptr atomic_readandclear_64
#define atomic_set_ptr atomic_set_64
+#define atomic_swap_ptr atomic_swap_64
#define atomic_subtract_ptr atomic_subtract_64
static __inline void
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