aboutsummaryrefslogtreecommitdiff
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/atomic_32.h42
-rw-r--r--arch/x86/include/asm/atomic_64.h81
2 files changed, 89 insertions, 34 deletions
diff --git a/arch/x86/include/asm/atomic_32.h b/arch/x86/include/asm/atomic_32.h
index e128ae988cc..036962ef820 100644
--- a/arch/x86/include/asm/atomic_32.h
+++ b/arch/x86/include/asm/atomic_32.h
@@ -4,6 +4,7 @@
#include <linux/compiler.h>
#include <linux/types.h>
#include <asm/processor.h>
+#include <asm/alternative.h>
#include <asm/cmpxchg.h>
/*
@@ -145,8 +146,8 @@ static inline int atomic_inc_and_test(atomic_t *v)
/**
* atomic_add_negative - add and test if negative
- * @v: pointer of type atomic_t
* @i: integer value to add
+ * @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns true
* if the result is negative, or false when
@@ -164,8 +165,8 @@ static inline int atomic_add_negative(int i, atomic_t *v)
/**
* atomic_add_return - add integer and return
- * @v: pointer of type atomic_t
* @i: integer value to add
+ * @v: pointer of type atomic_t
*
* Atomically adds @i to @v and returns @i + @v
*/
@@ -206,6 +207,9 @@ static inline int atomic_sub_return(int i, atomic_t *v)
return atomic_add_return(-i, v);
}
+#define atomic_inc_return(v) (atomic_add_return(1, v))
+#define atomic_dec_return(v) (atomic_sub_return(1, v))
+
static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
return cmpxchg(&v->counter, old, new);
@@ -242,8 +246,33 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
-#define atomic_inc_return(v) (atomic_add_return(1, v))
-#define atomic_dec_return(v) (atomic_sub_return(1, v))
+/**
+ * atomic_inc_short - increment of a short integer
+ * @v: pointer to type int
+ *
+ * Atomically adds 1 to @v
+ * Returns the new value of @u
+ */
+static inline short int atomic_inc_short(short int *v)
+{
+ asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
+ return *v;
+}
+
+#ifdef CONFIG_X86_64
+/**
+ * atomic_or_long - OR of two long integers
+ * @v1: pointer to type unsigned long
+ * @v2: pointer to type unsigned long
+ *
+ * Atomically ORs @v1 and @v2
+ * Returns the result of the OR
+ */
+static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
+{
+ asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
+}
+#endif
/* These are x86-specific, used by some header files */
#define atomic_clear_mask(mask, addr) \
@@ -251,8 +280,9 @@ static inline int atomic_add_unless(atomic_t *v, int a, int u)
: : "r" (~(mask)), "m" (*(addr)) : "memory")
#define atomic_set_mask(mask, addr) \
- asm volatile(LOCK_PREFIX "orl %0,%1" \
- : : "r" (mask), "m" (*(addr)) : "memory")
+ asm volatile(LOCK_PREFIX "orl %0,%1" \
+ : : "r" ((unsigned)(mask)), "m" (*(addr)) \
+ : "memory")
/* Atomic operations are already serializing on x86 */
#define smp_mb__before_atomic_dec() barrier()
diff --git a/arch/x86/include/asm/atomic_64.h b/arch/x86/include/asm/atomic_64.h
index 042c33100c6..77407887cfc 100644
--- a/arch/x86/include/asm/atomic_64.h
+++ b/arch/x86/include/asm/atomic_64.h
@@ -1,7 +1,9 @@
#ifndef _ASM_X86_ATOMIC_64_H
#define _ASM_X86_ATOMIC_64_H
+#include <linux/compiler.h>
#include <linux/types.h>
+#include <asm/processor.h>
#include <asm/alternative.h>
#include <asm/cmpxchg.h>
@@ -45,12 +47,12 @@ static inline void atomic_set(atomic_t *v, int i)
static inline void atomic_add(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "addl %1,%0"
- : "=m" (v->counter)
- : "ir" (i), "m" (v->counter));
+ : "+m" (v->counter)
+ : "ir" (i));
}
/**
- * atomic_sub - subtract the atomic variable
+ * atomic_sub - subtract integer from atomic variable
* @i: integer value to subtract
* @v: pointer of type atomic_t
*
@@ -59,8 +61,8 @@ static inline void atomic_add(int i, atomic_t *v)
static inline void atomic_sub(int i, atomic_t *v)
{
asm volatile(LOCK_PREFIX "subl %1,%0"
- : "=m" (v->counter)
- : "ir" (i), "m" (v->counter));
+ : "+m" (v->counter)
+ : "ir" (i));
}
/**
@@ -77,8 +79,8 @@ static inline int atomic_sub_and_test(int i, atomic_t *v)
unsigned char c;
asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"
- : "=m" (v->counter), "=qm" (c)
- : "ir" (i), "m" (v->counter) : "memory");
+ : "+m" (v->counter), "=qm" (c)
+ : "ir" (i) : "memory");
return c;
}
@@ -91,8 +93,7 @@ static inline int atomic_sub_and_test(int i, atomic_t *v)
static inline void atomic_inc(atomic_t *v)
{
asm volatile(LOCK_PREFIX "incl %0"
- : "=m" (v->counter)
- : "m" (v->counter));
+ : "+m" (v->counter));
}
/**
@@ -104,8 +105,7 @@ static inline void atomic_inc(atomic_t *v)
static inline void atomic_dec(atomic_t *v)
{
asm volatile(LOCK_PREFIX "decl %0"
- : "=m" (v->counter)
- : "m" (v->counter));
+ : "+m" (v->counter));
}
/**
@@ -121,8 +121,8 @@ static inline int atomic_dec_and_test(atomic_t *v)
unsigned char c;
asm volatile(LOCK_PREFIX "decl %0; sete %1"
- : "=m" (v->counter), "=qm" (c)
- : "m" (v->counter) : "memory");
+ : "+m" (v->counter), "=qm" (c)
+ : : "memory");
return c != 0;
}
@@ -139,8 +139,8 @@ static inline int atomic_inc_and_test(atomic_t *v)
unsigned char c;
asm volatile(LOCK_PREFIX "incl %0; sete %1"
- : "=m" (v->counter), "=qm" (c)
- : "m" (v->counter) : "memory");
+ : "+m" (v->counter), "=qm" (c)
+ : : "memory");
return c != 0;
}
@@ -158,13 +158,13 @@ static inline int atomic_add_negative(int i, atomic_t *v)
unsigned char c;
asm volatile(LOCK_PREFIX "addl %2,%0; sets %1"
- : "=m" (v->counter), "=qm" (c)
- : "ir" (i), "m" (v->counter) : "memory");
+ : "+m" (v->counter), "=qm" (c)
+ : "ir" (i) : "memory");
return c;
}
/**
- * atomic_add_return - add and return
+ * atomic_add_return - add integer and return
* @i: integer value to add
* @v: pointer of type atomic_t
*
@@ -172,13 +172,36 @@ static inline int atomic_add_negative(int i, atomic_t *v)
*/
static inline int atomic_add_return(int i, atomic_t *v)
{
- int __i = i;
+ int __i;
+#ifdef CONFIG_M386
+ unsigned long flags;
+ if (unlikely(boot_cpu_data.x86 <= 3))
+ goto no_xadd;
+#endif
+ /* Modern 486+ processor */
+ __i = i;
asm volatile(LOCK_PREFIX "xaddl %0, %1"
: "+r" (i), "+m" (v->counter)
: : "memory");
return i + __i;
+
+#ifdef CONFIG_M386
+no_xadd: /* Legacy 386 processor */
+ local_irq_save(flags);
+ __i = atomic_read(v);
+ atomic_set(v, i + __i);
+ local_irq_restore(flags);
+ return i + __i;
+#endif
}
+/**
+ * atomic_sub_return - subtract integer and return
+ * @v: pointer of type atomic_t
+ * @i: integer value to subtract
+ *
+ * Atomically subtracts @i from @v and returns @v - @i
+ */
static inline int atomic_sub_return(int i, atomic_t *v)
{
return atomic_add_return(-i, v);
@@ -187,23 +210,23 @@ static inline int atomic_sub_return(int i, atomic_t *v)
#define atomic_inc_return(v) (atomic_add_return(1, v))
#define atomic_dec_return(v) (atomic_sub_return(1, v))
-static inline long atomic_cmpxchg(atomic_t *v, int old, int new)
+static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
{
return cmpxchg(&v->counter, old, new);
}
-static inline long atomic_xchg(atomic_t *v, int new)
+static inline int atomic_xchg(atomic_t *v, int new)
{
return xchg(&v->counter, new);
}
/**
- * atomic_add_unless - add unless the number is a given value
+ * atomic_add_unless - add unless the number is already a given value
* @v: pointer of type atomic_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.
+ * Atomically adds @a to @v, so long as @v was not already @u.
* Returns non-zero if @v was not @u, and zero otherwise.
*/
static inline int atomic_add_unless(atomic_t *v, int a, int u)
@@ -236,6 +259,7 @@ static inline short int atomic_inc_short(short int *v)
return *v;
}
+#ifdef CONFIG_X86_64
/**
* atomic_or_long - OR of two long integers
* @v1: pointer to type unsigned long
@@ -248,15 +272,16 @@ static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
{
asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
}
+#endif
/* These are x86-specific, used by some header files */
-#define atomic_clear_mask(mask, addr) \
- asm volatile(LOCK_PREFIX "andl %0,%1" \
+#define atomic_clear_mask(mask, addr) \
+ asm volatile(LOCK_PREFIX "andl %0,%1" \
: : "r" (~(mask)), "m" (*(addr)) : "memory")
-#define atomic_set_mask(mask, addr) \
- asm volatile(LOCK_PREFIX "orl %0,%1" \
- : : "r" ((unsigned)(mask)), "m" (*(addr)) \
+#define atomic_set_mask(mask, addr) \
+ asm volatile(LOCK_PREFIX "orl %0,%1" \
+ : : "r" ((unsigned)(mask)), "m" (*(addr)) \
: "memory")
/* Atomic operations are already serializing on x86 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 15:55:01 +0000