local.h
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#ifndef _ARCH_MIPS_LOCAL_H
#define _ARCH_MIPS_LOCAL_H
#include <linux/percpu.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/cmpxchg.h>
#include <asm/compiler.h>
#include <asm/war.h>
typedef struct
{
atomic_long_t a;
} local_t;
#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
#define local_read(l) atomic_long_read(&(l)->a)
#define local_set(l, i) atomic_long_set(&(l)->a, (i))
#define local_add(i, l) atomic_long_add((i), (&(l)->a))
#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
#define local_inc(l) atomic_long_inc(&(l)->a)
#define local_dec(l) atomic_long_dec(&(l)->a)
/*
* Same as above, but return the result value
*/
static __inline__ long local_add_return(long i, local_t * l)
{
unsigned long result;
if (kernel_uses_llsc && R10000_LLSC_WAR) {
unsigned long temp;
__asm__ __volatile__(
" .set arch=r4000 \n"
"1:" __LL "%1, %2 # local_add_return \n"
" addu %0, %1, %3 \n"
__SC "%0, %2 \n"
" beqzl %0, 1b \n"
" addu %0, %1, %3 \n"
" .set mips0 \n"
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
} else if (kernel_uses_llsc) {
unsigned long temp;
__asm__ __volatile__(
" .set "MIPS_ISA_ARCH_LEVEL" \n"
"1:" __LL "%1, %2 # local_add_return \n"
" addu %0, %1, %3 \n"
__SC "%0, %2 \n"
" beqz %0, 1b \n"
" addu %0, %1, %3 \n"
" .set mips0 \n"
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
} else {
unsigned long flags;
local_irq_save(flags);
result = l->a.counter;
result += i;
l->a.counter = result;
local_irq_restore(flags);
}
return result;
}
static __inline__ long local_sub_return(long i, local_t * l)
{
unsigned long result;
if (kernel_uses_llsc && R10000_LLSC_WAR) {
unsigned long temp;
__asm__ __volatile__(
" .set arch=r4000 \n"
"1:" __LL "%1, %2 # local_sub_return \n"
" subu %0, %1, %3 \n"
__SC "%0, %2 \n"
" beqzl %0, 1b \n"
" subu %0, %1, %3 \n"
" .set mips0 \n"
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
} else if (kernel_uses_llsc) {
unsigned long temp;
__asm__ __volatile__(
" .set "MIPS_ISA_ARCH_LEVEL" \n"
"1:" __LL "%1, %2 # local_sub_return \n"
" subu %0, %1, %3 \n"
__SC "%0, %2 \n"
" beqz %0, 1b \n"
" subu %0, %1, %3 \n"
" .set mips0 \n"
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
} else {
unsigned long flags;
local_irq_save(flags);
result = l->a.counter;
result -= i;
l->a.counter = result;
local_irq_restore(flags);
}
return result;
}
#define local_cmpxchg(l, o, n) \
((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
/**
* local_add_unless - add unless the number is a given value
* @l: pointer of type local_t
* @a: the amount to add to l...
* @u: ...unless l is equal to u.
*
* Atomically adds @a to @l, so long as it was not @u.
* Returns non-zero if @l was not @u, and zero otherwise.
*/
#define local_add_unless(l, a, u) \
({ \
long c, old; \
c = local_read(l); \
while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
c = old; \
c != (u); \
})
#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
#define local_dec_return(l) local_sub_return(1, (l))
#define local_inc_return(l) local_add_return(1, (l))
/*
* local_sub_and_test - subtract value from variable and test result
* @i: integer value to subtract
* @l: pointer of type local_t
*
* Atomically subtracts @i from @l and returns
* true if the result is zero, or false for all
* other cases.
*/
#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
/*
* local_inc_and_test - increment and test
* @l: pointer of type local_t
*
* Atomically increments @l by 1
* and returns true if the result is zero, or false for all
* other cases.
*/
#define local_inc_and_test(l) (local_inc_return(l) == 0)
/*
* local_dec_and_test - decrement by 1 and test
* @l: pointer of type local_t
*
* Atomically decrements @l by 1 and
* returns true if the result is 0, or false for all other
* cases.
*/
#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
/*
* local_add_negative - add and test if negative
* @l: pointer of type local_t
* @i: integer value to add
*
* Atomically adds @i to @l and returns true
* if the result is negative, or false when
* result is greater than or equal to zero.
*/
#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
/* Use these for per-cpu local_t variables: on some archs they are
* much more efficient than these naive implementations. Note they take
* a variable, not an address.
*/
#define __local_inc(l) ((l)->a.counter++)
#define __local_dec(l) ((l)->a.counter++)
#define __local_add(i, l) ((l)->a.counter+=(i))
#define __local_sub(i, l) ((l)->a.counter-=(i))
#endif /* _ARCH_MIPS_LOCAL_H */