tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __ASM_BARRIER_H
2#define __ASM_BARRIER_H
3
4#ifndef __ASSEMBLY__
5#include <asm/outercache.h>
6
7#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
8
9#if __LINUX_ARM_ARCH__ >= 7 || \
10 (__LINUX_ARM_ARCH__ == 6 && defined(CONFIG_CPU_32v6K))
11#define sev() __asm__ __volatile__ ("sev" : : : "memory")
12#define wfe() __asm__ __volatile__ ("wfe" : : : "memory")
13#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
14#endif
15
16#if __LINUX_ARM_ARCH__ >= 7
17#define isb(option) __asm__ __volatile__ ("isb " #option : : : "memory")
18#define dsb(option) __asm__ __volatile__ ("dsb " #option : : : "memory")
19#define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory")
20#elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
21#define isb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
22 : : "r" (0) : "memory")
23#define dsb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
24 : : "r" (0) : "memory")
25#define dmb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
26 : : "r" (0) : "memory")
27#elif defined(CONFIG_CPU_FA526)
28#define isb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
29 : : "r" (0) : "memory")
30#define dsb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
31 : : "r" (0) : "memory")
32#define dmb(x) __asm__ __volatile__ ("" : : : "memory")
33#else
34#define isb(x) __asm__ __volatile__ ("" : : : "memory")
35#define dsb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
36 : : "r" (0) : "memory")
37#define dmb(x) __asm__ __volatile__ ("" : : : "memory")
38#endif
39
40#ifdef CONFIG_ARCH_HAS_BARRIERS
41#include <mach/barriers.h>
42#elif defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP)
43#define mb() do { dsb(); outer_sync(); } while (0)
44#define rmb() dsb()
45#define wmb() do { dsb(st); outer_sync(); } while (0)
46#else
47#define mb() barrier()
48#define rmb() barrier()
49#define wmb() barrier()
50#endif
51
52#ifndef CONFIG_SMP
53#define smp_mb() barrier()
54#define smp_rmb() barrier()
55#define smp_wmb() barrier()
56#else
57#define smp_mb() dmb(ish)
58#define smp_rmb() smp_mb()
59#define smp_wmb() dmb(ishst)
60#endif
61
62#define smp_store_release(p, v) \
63do { \
64 compiletime_assert_atomic_type(*p); \
65 smp_mb(); \
66 ACCESS_ONCE(*p) = (v); \
67} while (0)
68
69#define smp_load_acquire(p) \
70({ \
71 typeof(*p) ___p1 = ACCESS_ONCE(*p); \
72 compiletime_assert_atomic_type(*p); \
73 smp_mb(); \
74 ___p1; \
75})
76
77#define read_barrier_depends() do { } while(0)
78#define smp_read_barrier_depends() do { } while(0)
79
80#define set_mb(var, value) do { var = value; smp_mb(); } while (0)
81
82#endif /* !__ASSEMBLY__ */
83#endif /* __ASM_BARRIER_H */