summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm')
-rw-r--r--arch/x86/include/asm/atomic64_32.h278
1 files changed, 211 insertions, 67 deletions
diff --git a/arch/x86/include/asm/atomic64_32.h b/arch/x86/include/asm/atomic64_32.h
index 03027bf28de5..2a934aa19a43 100644
--- a/arch/x86/include/asm/atomic64_32.h
+++ b/arch/x86/include/asm/atomic64_32.h
@@ -14,109 +14,193 @@ typedef struct {
#define ATOMIC64_INIT(val) { (val) }
-extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);
+#ifdef CONFIG_X86_CMPXCHG64
+#define ATOMIC64_ALTERNATIVE_(f, g) "call atomic64_" #g "_cx8"
+#else
+#define ATOMIC64_ALTERNATIVE_(f, g) ALTERNATIVE("call atomic64_" #f "_386", "call atomic64_" #g "_cx8", X86_FEATURE_CX8)
+#endif
+
+#define ATOMIC64_ALTERNATIVE(f) ATOMIC64_ALTERNATIVE_(f, f)
+
+/**
+ * atomic64_cmpxchg - cmpxchg atomic64 variable
+ * @p: pointer to type atomic64_t
+ * @o: expected value
+ * @n: new value
+ *
+ * Atomically sets @v to @n if it was equal to @o and returns
+ * the old value.
+ */
+
+static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
+{
+ return cmpxchg64(&v->counter, o, n);
+}
/**
* atomic64_xchg - xchg atomic64 variable
- * @ptr: pointer to type atomic64_t
- * @new_val: value to assign
+ * @v: pointer to type atomic64_t
+ * @n: value to assign
*
- * Atomically xchgs the value of @ptr to @new_val and returns
+ * Atomically xchgs the value of @v to @n and returns
* the old value.
*/
-extern u64 atomic64_xchg(atomic64_t *ptr, u64 new_val);
+static inline long long atomic64_xchg(atomic64_t *v, long long n)
+{
+ long long o;
+ unsigned high = (unsigned)(n >> 32);
+ unsigned low = (unsigned)n;
+ asm volatile(ATOMIC64_ALTERNATIVE(xchg)
+ : "=A" (o), "+b" (low), "+c" (high)
+ : "S" (v)
+ : "memory"
+ );
+ return o;
+}
/**
* atomic64_set - set atomic64 variable
- * @ptr: pointer to type atomic64_t
- * @new_val: value to assign
+ * @v: pointer to type atomic64_t
+ * @n: value to assign
*
- * Atomically sets the value of @ptr to @new_val.
+ * Atomically sets the value of @v to @n.
*/
-extern void atomic64_set(atomic64_t *ptr, u64 new_val);
+static inline void atomic64_set(atomic64_t *v, long long i)
+{
+ unsigned high = (unsigned)(i >> 32);
+ unsigned low = (unsigned)i;
+ asm volatile(ATOMIC64_ALTERNATIVE(set)
+ : "+b" (low), "+c" (high)
+ : "S" (v)
+ : "eax", "edx", "memory"
+ );
+}
/**
* atomic64_read - read atomic64 variable
- * @ptr: pointer to type atomic64_t
+ * @v: pointer to type atomic64_t
*
- * Atomically reads the value of @ptr and returns it.
+ * Atomically reads the value of @v and returns it.
*/
-static inline u64 atomic64_read(atomic64_t *ptr)
+static inline long long atomic64_read(atomic64_t *v)
{
- u64 res;
-
- /*
- * Note, we inline this atomic64_t primitive because
- * it only clobbers EAX/EDX and leaves the others
- * untouched. We also (somewhat subtly) rely on the
- * fact that cmpxchg8b returns the current 64-bit value
- * of the memory location we are touching:
- */
- asm volatile(
- "mov %%ebx, %%eax\n\t"
- "mov %%ecx, %%edx\n\t"
- LOCK_PREFIX "cmpxchg8b %1\n"
- : "=&A" (res)
- : "m" (*ptr)
- );
-
- return res;
-}
-
-extern u64 atomic64_read(atomic64_t *ptr);
+ long long r;
+ asm volatile(ATOMIC64_ALTERNATIVE(read)
+ : "=A" (r), "+c" (v)
+ : : "memory"
+ );
+ return r;
+ }
/**
* atomic64_add_return - add and return
- * @delta: integer value to add
- * @ptr: pointer to type atomic64_t
+ * @i: integer value to add
+ * @v: pointer to type atomic64_t
*
- * Atomically adds @delta to @ptr and returns @delta + *@ptr
+ * Atomically adds @i to @v and returns @i + *@v
*/
-extern u64 atomic64_add_return(u64 delta, atomic64_t *ptr);
+static inline long long atomic64_add_return(long long i, atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE(add_return)
+ : "+A" (i), "+c" (v)
+ : : "memory"
+ );
+ return i;
+}
/*
* Other variants with different arithmetic operators:
*/
-extern u64 atomic64_sub_return(u64 delta, atomic64_t *ptr);
-extern u64 atomic64_inc_return(atomic64_t *ptr);
-extern u64 atomic64_dec_return(atomic64_t *ptr);
+static inline long long atomic64_sub_return(long long i, atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE(sub_return)
+ : "+A" (i), "+c" (v)
+ : : "memory"
+ );
+ return i;
+}
+
+static inline long long atomic64_inc_return(atomic64_t *v)
+{
+ long long a;
+ asm volatile(ATOMIC64_ALTERNATIVE(inc_return)
+ : "=A" (a)
+ : "S" (v)
+ : "memory", "ecx"
+ );
+ return a;
+}
+
+static inline long long atomic64_dec_return(atomic64_t *v)
+{
+ long long a;
+ asm volatile(ATOMIC64_ALTERNATIVE(dec_return)
+ : "=A" (a)
+ : "S" (v)
+ : "memory", "ecx"
+ );
+ return a;
+}
/**
* atomic64_add - add integer to atomic64 variable
- * @delta: integer value to add
- * @ptr: pointer to type atomic64_t
+ * @i: integer value to add
+ * @v: pointer to type atomic64_t
*
- * Atomically adds @delta to @ptr.
+ * Atomically adds @i to @v.
*/
-extern void atomic64_add(u64 delta, atomic64_t *ptr);
+static inline long long atomic64_add(long long i, atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE_(add, add_return)
+ : "+A" (i), "+c" (v)
+ : : "memory"
+ );
+ return i;
+}
/**
* atomic64_sub - subtract the atomic64 variable
- * @delta: integer value to subtract
- * @ptr: pointer to type atomic64_t
+ * @i: integer value to subtract
+ * @v: pointer to type atomic64_t
*
- * Atomically subtracts @delta from @ptr.
+ * Atomically subtracts @i from @v.
*/
-extern void atomic64_sub(u64 delta, atomic64_t *ptr);
+static inline long long atomic64_sub(long long i, atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE_(sub, sub_return)
+ : "+A" (i), "+c" (v)
+ : : "memory"
+ );
+ return i;
+}
/**
* atomic64_sub_and_test - subtract value from variable and test result
- * @delta: integer value to subtract
- * @ptr: pointer to type atomic64_t
- *
- * Atomically subtracts @delta from @ptr and returns
+ * @i: integer value to subtract
+ * @v: pointer to type atomic64_t
+ *
+ * Atomically subtracts @i from @v and returns
* true if the result is zero, or false for all
* other cases.
*/
-extern int atomic64_sub_and_test(u64 delta, atomic64_t *ptr);
+static inline int atomic64_sub_and_test(long long i, atomic64_t *v)
+{
+ return atomic64_sub_return(i, v) == 0;
+}
/**
* atomic64_inc - increment atomic64 variable
- * @ptr: pointer to type atomic64_t
+ * @v: pointer to type atomic64_t
*
- * Atomically increments @ptr by 1.
+ * Atomically increments @v by 1.
*/
-extern void atomic64_inc(atomic64_t *ptr);
+static inline void atomic64_inc(atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE_(inc, inc_return)
+ : : "S" (v)
+ : "memory", "eax", "ecx", "edx"
+ );
+}
/**
* atomic64_dec - decrement atomic64 variable
@@ -124,37 +208,97 @@ extern void atomic64_inc(atomic64_t *ptr);
*
* Atomically decrements @ptr by 1.
*/
-extern void atomic64_dec(atomic64_t *ptr);
+static inline void atomic64_dec(atomic64_t *v)
+{
+ asm volatile(ATOMIC64_ALTERNATIVE_(dec, dec_return)
+ : : "S" (v)
+ : "memory", "eax", "ecx", "edx"
+ );
+}
/**
* atomic64_dec_and_test - decrement and test
- * @ptr: pointer to type atomic64_t
+ * @v: pointer to type atomic64_t
*
- * Atomically decrements @ptr by 1 and
+ * Atomically decrements @v by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
-extern int atomic64_dec_and_test(atomic64_t *ptr);
+static inline int atomic64_dec_and_test(atomic64_t *v)
+{
+ return atomic64_dec_return(v) == 0;
+}
/**
* atomic64_inc_and_test - increment and test
- * @ptr: pointer to type atomic64_t
+ * @v: pointer to type atomic64_t
*
- * Atomically increments @ptr by 1
+ * Atomically increments @v by 1
* and returns true if the result is zero, or false for all
* other cases.
*/
-extern int atomic64_inc_and_test(atomic64_t *ptr);
+static inline int atomic64_inc_and_test(atomic64_t *v)
+{
+ return atomic64_inc_return(v) == 0;
+}
/**
* atomic64_add_negative - add and test if negative
- * @delta: integer value to add
- * @ptr: pointer to type atomic64_t
+ * @i: integer value to add
+ * @v: pointer to type atomic64_t
*
- * Atomically adds @delta to @ptr and returns true
+ * Atomically adds @i to @v and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
-extern int atomic64_add_negative(u64 delta, atomic64_t *ptr);
+static inline int atomic64_add_negative(long long i, atomic64_t *v)
+{
+ return atomic64_add_return(i, v) < 0;
+}
+
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
+{
+ unsigned low = (unsigned)u;
+ unsigned high = (unsigned)(u >> 32);
+ asm volatile(ATOMIC64_ALTERNATIVE(add_unless) "\n\t"
+ : "+A" (a), "+c" (v), "+S" (low), "+D" (high)
+ : : "memory");
+ return (int)a;
+}
+
+
+static inline int atomic64_inc_not_zero(atomic64_t *v)
+{
+ int r;
+ asm volatile(ATOMIC64_ALTERNATIVE(inc_not_zero)
+ : "=a" (r)
+ : "S" (v)
+ : "ecx", "edx", "memory"
+ );
+ return r;
+}
+
+static inline long long atomic64_dec_if_positive(atomic64_t *v)
+{
+ long long r;
+ asm volatile(ATOMIC64_ALTERNATIVE(dec_if_positive)
+ : "=A" (r)
+ : "S" (v)
+ : "ecx", "memory"
+ );
+ return r;
+}
+
+#undef ATOMIC64_ALTERNATIVE
+#undef ATOMIC64_ALTERNATIVE_
#endif /* _ASM_X86_ATOMIC64_32_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 06:54:17 +0100