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ARM: Add ARMv6 or older __sync_synchronize built-in

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* On ARMv6 or older, we do a simulated dsb.
* Move __sync_synchronize into thread.c in libroot
  and use the new arch_atomic.h dsb/dmb defines.
* Gets arm @bootstrap-raw to end of bootstrap.
This commit is contained in:
Alexander von Gluck IV
2014-02-26 12:51:51 -06:00
parent cb7de03cca
commit a21611e439
3 changed files with 41 additions and 16 deletions
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headers/private/kernel/arch/arm/arch_atomic.h
+18 -6
View File
@@ -9,29 +9,41 @@
#define _KERNEL_ARCH_ARM_ATOMIC_H
#if __ARM_ARCH__ <= 6
#define dsb() __asm__ __volatile__("mcr p15, 0, %0, c7, c10, 4" \
: : "r" (0) : "memory")
#define dmb() __asm__ __volatile__("mcr p15, 0, %0, c7, c10, 4" \
: : "r" (0) : "memory")
#else
#define dsb() __asm__ __volatile__("dsb" : : : "memory")
#define dmb() __asm__ __volatile__("dmb" : : : "memory")
#endif
static inline void
memory_read_barrier_inline(void)
{
asm volatile ("":::"memory");
dmb();
}
static inline void
memory_write_barrier_inline(void)
{
asm volatile ("":::"memory");
dmb();
}
static inline void
memory_full_barrier_inline(void)
{
asm volatile ("":::"memory");
dmb();
}
#define memory_read_barrier memory_read_barrier_inline
#define memory_write_barrier memory_write_barrier_inline
#define memory_full_barrier memory_full_barrier_inline
#define memory_read_barrier memory_read_barrier_inline
#define memory_write_barrier memory_write_barrier_inline
#define memory_full_barrier memory_full_barrier_inline
#endif // _KERNEL_ARCH_ARM_ATOMIC_H