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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | /** @addtogroup ia32 |
29 | /** @addtogroup ia32 |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| Line 44... | Line 44... | ||
| 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 | #if defined(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 defined(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 | /* |
87 | /* |
| 88 | * On ia32, the hardware takes care about instruction and data cache coherence, |
88 | * On ia32, the hardware takes care about instruction and data cache coherence, |
| 89 | * even on SMP systems. We issue a write barrier to be sure that writes |
89 | * even on SMP systems. We issue a write barrier to be sure that writes |
| 90 | * queueing in the store buffer drain to the memory (even though it would be |
90 | * queueing in the store buffer drain to the memory (even though it would be |
| 91 | * sufficient for them to drain to the D-cache). |
91 | * sufficient for them to drain to the D-cache). |
| 92 | */ |
92 | */ |
| 93 | #define smc_coherence(a) write_barrier() |
93 | #define smc_coherence(a) write_barrier() |
| 94 | #define smc_coherence_block(a, l) write_barrier() |
94 | #define smc_coherence_block(a, l) write_barrier() |
| 95 | 95 | ||
| 96 | #endif |
96 | #endif |
| 97 | 97 | ||
| 98 | /** @} |
98 | /** @} |
| 99 | */ |
99 | */ |