This source file includes following definitions.
- array_index_mask_nospec
1
2 #ifndef _ASM_X86_BARRIER_H
3 #define _ASM_X86_BARRIER_H
4
5 #include <asm/alternative.h>
6 #include <asm/nops.h>
7
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12
13
14 #ifdef CONFIG_X86_32
15 #define mb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "mfence", \
16 X86_FEATURE_XMM2) ::: "memory", "cc")
17 #define rmb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "lfence", \
18 X86_FEATURE_XMM2) ::: "memory", "cc")
19 #define wmb() asm volatile(ALTERNATIVE("lock; addl $0,-4(%%esp)", "sfence", \
20 X86_FEATURE_XMM2) ::: "memory", "cc")
21 #else
22 #define mb() asm volatile("mfence":::"memory")
23 #define rmb() asm volatile("lfence":::"memory")
24 #define wmb() asm volatile("sfence" ::: "memory")
25 #endif
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35
36 static inline unsigned long array_index_mask_nospec(unsigned long index,
37 unsigned long size)
38 {
39 unsigned long mask;
40
41 asm volatile ("cmp %1,%2; sbb %0,%0;"
42 :"=r" (mask)
43 :"g"(size),"r" (index)
44 :"cc");
45 return mask;
46 }
47
48
49 #define array_index_mask_nospec array_index_mask_nospec
50
51
52 #define barrier_nospec() alternative("", "lfence", X86_FEATURE_LFENCE_RDTSC)
53
54 #define dma_rmb() barrier()
55 #define dma_wmb() barrier()
56
57 #ifdef CONFIG_X86_32
58 #define __smp_mb() asm volatile("lock; addl $0,-4(%%esp)" ::: "memory", "cc")
59 #else
60 #define __smp_mb() asm volatile("lock; addl $0,-4(%%rsp)" ::: "memory", "cc")
61 #endif
62 #define __smp_rmb() dma_rmb()
63 #define __smp_wmb() barrier()
64 #define __smp_store_mb(var, value) do { (void)xchg(&var, value); } while (0)
65
66 #define __smp_store_release(p, v) \
67 do { \
68 compiletime_assert_atomic_type(*p); \
69 barrier(); \
70 WRITE_ONCE(*p, v); \
71 } while (0)
72
73 #define __smp_load_acquire(p) \
74 ({ \
75 typeof(*p) ___p1 = READ_ONCE(*p); \
76 compiletime_assert_atomic_type(*p); \
77 barrier(); \
78 ___p1; \
79 })
80
81
82 #define __smp_mb__before_atomic() do { } while (0)
83 #define __smp_mb__after_atomic() do { } while (0)
84
85 #include <asm-generic/barrier.h>
86
87 #endif