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arm: added ARM-specific files modelled after arch/x86

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Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Alexander Kartashov
2013-01-22 22:53:24 +04:00
committed by Pavel Emelyanov
parent a0c86a25ab
commit 8fa8ca9feb
24 changed files with 1656 additions and 0 deletions
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66
test/zdtm/lib/arch/arm/include/asm/atomic.h Normal file
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#ifndef __CR_ATOMIC_H__
#define __CR_ATOMIC_H__
typedef uint32_t atomic_t;
/* Copied from the Linux kernel header arch/arm/include/asm/atomic.h */
#define smp_mb() __asm__ __volatile__ ("dmb" : : : "memory")
#define atomic_set(mem,v) (*(mem) = (v))
#define atomic_get(v) (*(volatile uint32_t *)v)
static inline unsigned int atomic_add_return(int i, atomic_t *v)
{
unsigned long tmp;
unsigned int result;
smp_mb();
__asm__ __volatile__("@ atomic_add_return\n"
"1: ldrex %0, [%3]\n"
" add %0, %0, %4\n"
" strex %1, %0, [%3]\n"
" teq %1, #0\n"
" bne 1b\n"
: "=&r" (result), "=&r" (tmp), "+Qo" (v)
: "r" (&v), "Ir" (i)
: "cc");
smp_mb();
return result;
}
static inline unsigned int atomic_sub_return(int i, atomic_t *v)
{
unsigned long tmp;
int result;
smp_mb();
__asm__ __volatile__("@ atomic_sub_return\n"
"1: ldrex %0, [%3]\n"
" sub %0, %0, %4\n"
" strex %1, %0, [%3]\n"
" teq %1, #0\n"
" bne 1b\n"
: "=&r" (result), "=&r" (tmp), "+Qo" (v)
: "r" (&v), "Ir" (i)
: "cc");
smp_mb();
return result;
}
static inline unsigned int atomic_inc(atomic_t *v) { return atomic_add_return(1, v) - 1; }
static inline unsigned int atomic_dec(atomic_t *v) { return atomic_sub_return(1, v) + 1; }
/* true if the result is 0, or false for all other cases. */
#define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0)
#endif /* __CR_ATOMIC_H__ */