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44 | 44 | ||
45 | /* |
45 | /* |
46 | * Provisions are made to prevent compiler from reordering instructions itself. |
46 | * Provisions are made to prevent compiler from reordering instructions itself. |
47 | */ |
47 | */ |
48 | 48 | ||
49 | #define CS_ENTER_BARRIER() __asm__ volatile ("" ::: "memory") |
49 | #define CS_ENTER_BARRIER() asm volatile ("" ::: "memory") |
50 | #define CS_LEAVE_BARRIER() __asm__ volatile ("" ::: "memory") |
50 | #define CS_LEAVE_BARRIER() asm volatile ("" ::: "memory") |
51 | 51 | ||
52 | static inline void cpuid_serialization(void) |
52 | static inline void cpuid_serialization(void) |
53 | { |
53 | { |
54 | __asm__ volatile ( |
54 | asm volatile ( |
55 | "xorl %%eax, %%eax\n" |
55 | "xorl %%eax, %%eax\n" |
56 | "cpuid\n" |
56 | "cpuid\n" |
57 | ::: "eax", "ebx", "ecx", "edx", "memory" |
57 | ::: "eax", "ebx", "ecx", "edx", "memory" |
58 | ); |
58 | ); |
59 | } |
59 | } |
60 | 60 | ||
61 | #ifdef CONFIG_FENCES_P4 |
61 | #ifdef CONFIG_FENCES_P4 |
62 | # define memory_barrier() __asm__ volatile ("mfence\n" ::: "memory") |
62 | # define memory_barrier() asm volatile ("mfence\n" ::: "memory") |
63 | # define read_barrier() __asm__ volatile ("lfence\n" ::: "memory") |
63 | # define read_barrier() asm volatile ("lfence\n" ::: "memory") |
64 | # ifdef CONFIG_WEAK_MEMORY |
64 | # ifdef CONFIG_WEAK_MEMORY |
65 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
65 | # define write_barrier() asm volatile ("sfence\n" ::: "memory") |
66 | # else |
66 | # else |
67 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
67 | # define write_barrier() asm volatile( "" ::: "memory"); |
68 | # endif |
68 | # endif |
69 | #elif CONFIG_FENCES_P3 |
69 | #elif CONFIG_FENCES_P3 |
70 | # define memory_barrier() cpuid_serialization() |
70 | # define memory_barrier() cpuid_serialization() |
71 | # define read_barrier() cpuid_serialization() |
71 | # define read_barrier() cpuid_serialization() |
72 | # ifdef CONFIG_WEAK_MEMORY |
72 | # ifdef CONFIG_WEAK_MEMORY |
73 | # define write_barrier() __asm__ volatile ("sfence\n" ::: "memory") |
73 | # define write_barrier() asm volatile ("sfence\n" ::: "memory") |
74 | # else |
74 | # else |
75 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
75 | # define write_barrier() asm volatile( "" ::: "memory"); |
76 | # endif |
76 | # endif |
77 | #else |
77 | #else |
78 | # define memory_barrier() cpuid_serialization() |
78 | # define memory_barrier() cpuid_serialization() |
79 | # define read_barrier() cpuid_serialization() |
79 | # define read_barrier() cpuid_serialization() |
80 | # ifdef CONFIG_WEAK_MEMORY |
80 | # ifdef CONFIG_WEAK_MEMORY |
81 | # define write_barrier() cpuid_serialization() |
81 | # define write_barrier() cpuid_serialization() |
82 | # else |
82 | # else |
83 | # define write_barrier() __asm__ volatile( "" ::: "memory"); |
83 | # define write_barrier() asm volatile( "" ::: "memory"); |
84 | # endif |
84 | # endif |
85 | #endif |
85 | #endif |
86 | 86 | ||
87 | #endif |
87 | #endif |
88 | 88 |