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4522d58275
* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6: (156 commits) [PATCH] x86-64: Export smp_call_function_single [PATCH] i386: Clean up smp_tune_scheduling() [PATCH] unwinder: move .eh_frame to RODATA [PATCH] unwinder: fully support linker generated .eh_frame_hdr section [PATCH] x86-64: don't use set_irq_regs() [PATCH] x86-64: check vector in setup_ioapic_dest to verify if need setup_IO_APIC_irq [PATCH] x86-64: Make ix86 default to HIGHMEM4G instead of NOHIGHMEM [PATCH] i386: replace kmalloc+memset with kzalloc [PATCH] x86-64: remove remaining pc98 code [PATCH] x86-64: remove unused variable [PATCH] x86-64: Fix constraints in atomic_add_return() [PATCH] x86-64: fix asm constraints in i386 atomic_add_return [PATCH] x86-64: Correct documentation for bzImage protocol v2.05 [PATCH] x86-64: replace kmalloc+memset with kzalloc in MTRR code [PATCH] x86-64: Fix numaq build error [PATCH] x86-64: include/asm-x86_64/cpufeature.h isn't a userspace header [PATCH] unwinder: Add debugging output to the Dwarf2 unwinder [PATCH] x86-64: Clarify error message in GART code [PATCH] x86-64: Fix interrupt race in idle callback (3rd try) [PATCH] x86-64: Remove unwind stack pointer alignment forcing again ... Fixed conflict in include/linux/uaccess.h manually Signed-off-by: Linus Torvalds <torvalds@osdl.org>
258 lines
5.8 KiB
C
258 lines
5.8 KiB
C
#ifndef __ARCH_I386_ATOMIC__
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#define __ARCH_I386_ATOMIC__
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#include <linux/compiler.h>
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#include <asm/processor.h>
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*/
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/*
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* Make sure gcc doesn't try to be clever and move things around
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* on us. We need to use _exactly_ the address the user gave us,
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* not some alias that contains the same information.
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*/
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typedef struct { int counter; } atomic_t;
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#define ATOMIC_INIT(i) { (i) }
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/**
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* atomic_read - read atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically reads the value of @v.
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*/
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#define atomic_read(v) ((v)->counter)
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/**
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* atomic_set - set atomic variable
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* @v: pointer of type atomic_t
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* @i: required value
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*
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* Atomically sets the value of @v to @i.
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*/
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#define atomic_set(v,i) (((v)->counter) = (i))
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/**
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* atomic_add - add integer to atomic variable
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* @i: integer value to add
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* @v: pointer of type atomic_t
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*
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* Atomically adds @i to @v.
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*/
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static __inline__ void atomic_add(int i, atomic_t *v)
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{
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__asm__ __volatile__(
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LOCK_PREFIX "addl %1,%0"
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:"+m" (v->counter)
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:"ir" (i));
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}
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/**
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* atomic_sub - subtract the atomic variable
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* @i: integer value to subtract
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* @v: pointer of type atomic_t
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*
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* Atomically subtracts @i from @v.
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*/
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static __inline__ void atomic_sub(int i, atomic_t *v)
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{
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__asm__ __volatile__(
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LOCK_PREFIX "subl %1,%0"
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:"+m" (v->counter)
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:"ir" (i));
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}
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/**
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* atomic_sub_and_test - subtract value from variable and test result
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* @i: integer value to subtract
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* @v: pointer of type atomic_t
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*
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* Atomically subtracts @i from @v and returns
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* true if the result is zero, or false for all
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* other cases.
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*/
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static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
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{
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unsigned char c;
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__asm__ __volatile__(
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LOCK_PREFIX "subl %2,%0; sete %1"
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:"+m" (v->counter), "=qm" (c)
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:"ir" (i) : "memory");
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return c;
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}
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/**
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* atomic_inc - increment atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1.
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*/
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static __inline__ void atomic_inc(atomic_t *v)
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{
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__asm__ __volatile__(
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LOCK_PREFIX "incl %0"
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:"+m" (v->counter));
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}
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/**
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* atomic_dec - decrement atomic variable
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* @v: pointer of type atomic_t
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*
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* Atomically decrements @v by 1.
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*/
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static __inline__ void atomic_dec(atomic_t *v)
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{
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__asm__ __volatile__(
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LOCK_PREFIX "decl %0"
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:"+m" (v->counter));
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}
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/**
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* atomic_dec_and_test - decrement and test
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* @v: pointer of type atomic_t
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*
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* Atomically decrements @v by 1 and
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* returns true if the result is 0, or false for all other
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* cases.
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*/
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static __inline__ int atomic_dec_and_test(atomic_t *v)
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{
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unsigned char c;
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__asm__ __volatile__(
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LOCK_PREFIX "decl %0; sete %1"
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:"+m" (v->counter), "=qm" (c)
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: : "memory");
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return c != 0;
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}
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/**
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* atomic_inc_and_test - increment and test
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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static __inline__ int atomic_inc_and_test(atomic_t *v)
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{
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unsigned char c;
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__asm__ __volatile__(
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LOCK_PREFIX "incl %0; sete %1"
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:"+m" (v->counter), "=qm" (c)
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: : "memory");
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return c != 0;
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}
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/**
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* atomic_add_negative - add and test if negative
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* @v: pointer of type atomic_t
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* @i: integer value to add
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*
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* Atomically adds @i to @v and returns true
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* if the result is negative, or false when
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* result is greater than or equal to zero.
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*/
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static __inline__ int atomic_add_negative(int i, atomic_t *v)
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{
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unsigned char c;
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__asm__ __volatile__(
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LOCK_PREFIX "addl %2,%0; sets %1"
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:"+m" (v->counter), "=qm" (c)
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:"ir" (i) : "memory");
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return c;
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}
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/**
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* atomic_add_return - add and return
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* @v: pointer of type atomic_t
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* @i: integer value to add
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*
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* Atomically adds @i to @v and returns @i + @v
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*/
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static __inline__ int atomic_add_return(int i, atomic_t *v)
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{
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int __i;
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#ifdef CONFIG_M386
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unsigned long flags;
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if(unlikely(boot_cpu_data.x86==3))
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goto no_xadd;
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#endif
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/* Modern 486+ processor */
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__i = i;
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__asm__ __volatile__(
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LOCK_PREFIX "xaddl %0, %1"
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:"+r" (i), "+m" (v->counter)
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: : "memory");
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return i + __i;
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#ifdef CONFIG_M386
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no_xadd: /* Legacy 386 processor */
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local_irq_save(flags);
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__i = atomic_read(v);
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atomic_set(v, i + __i);
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local_irq_restore(flags);
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return i + __i;
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#endif
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}
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static __inline__ int atomic_sub_return(int i, atomic_t *v)
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{
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return atomic_add_return(-i,v);
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}
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#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
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#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
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/**
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* atomic_add_unless - add unless the number is a given value
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* @v: pointer of type atomic_t
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* @a: the amount to add to v...
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* @u: ...unless v is equal to u.
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*
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* Atomically adds @a to @v, so long as it was not @u.
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* Returns non-zero if @v was not @u, and zero otherwise.
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*/
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#define atomic_add_unless(v, a, u) \
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({ \
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int c, old; \
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c = atomic_read(v); \
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for (;;) { \
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if (unlikely(c == (u))) \
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break; \
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old = atomic_cmpxchg((v), c, c + (a)); \
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if (likely(old == c)) \
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break; \
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c = old; \
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} \
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c != (u); \
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})
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#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
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#define atomic_inc_return(v) (atomic_add_return(1,v))
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#define atomic_dec_return(v) (atomic_sub_return(1,v))
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/* These are x86-specific, used by some header files */
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#define atomic_clear_mask(mask, addr) \
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__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
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: : "r" (~(mask)),"m" (*addr) : "memory")
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#define atomic_set_mask(mask, addr) \
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__asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
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: : "r" (mask),"m" (*(addr)) : "memory")
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/* Atomic operations are already serializing on x86 */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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#include <asm-generic/atomic.h>
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#endif
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