diff options
Diffstat (limited to '')
| -rw-r--r-- | Cargo.toml | 2 | ||||
| -rw-r--r-- | src/apic/x2apic.rs | 2 | ||||
| -rw-r--r-- | src/fence.rs | 28 | ||||
| -rw-r--r-- | src/lib.rs | 1 |
4 files changed, 31 insertions, 2 deletions
@@ -1,6 +1,6 @@ [package] name = "x86" -version = "0.37.0" +version = "0.38.0" authors = [ "Gerd Zellweger <mail@gerdzellweger.com>", "Eric Kidd <git@randomhacks.net>", diff --git a/src/apic/x2apic.rs b/src/apic/x2apic.rs index 01cc220..28d3a84 100644 --- a/src/apic/x2apic.rs +++ b/src/apic/x2apic.rs @@ -116,7 +116,7 @@ impl ApicControl for X2APIC { /// Set tsc deadline. fn tsc_set(&self, value: u64) { unsafe { - llvm_asm!("mfence" ::: "memory"); + crate::fence::mfence(); wrmsr(IA32_TSC_DEADLINE, value); } } diff --git a/src/fence.rs b/src/fence.rs new file mode 100644 index 0000000..9268d02 --- /dev/null +++ b/src/fence.rs @@ -0,0 +1,28 @@ +//! Intel fence instructions + +/// mfence -- Memory Fence +/// +/// Performs a serializing operation on all load-from-memory and store-to-memory +/// instructions that were issued prior the MFENCE instruction. +pub fn mfence() { + unsafe { llvm_asm!("mfence" ::: "memory") }; +} + +/// sfence -- Store Fence +/// +/// Orders processor execution relative to all memory stores prior to the SFENCE +/// instruction. The processor ensures that every store prior to SFENCE is +/// globally visible before any store after SFENCE becomes globally visible. +pub fn sfence() { + unsafe { llvm_asm!("sfence" ::: "memory") }; +} + +/// lfence -- Load Fence +/// +/// Performs a serializing operation on all load-from-memory instructions that +/// were issued prior the LFENCE instruction. Specifically, LFENCE does not +/// execute until all prior instructions have completed locally, and no later +/// instruction begins execution until LFENCE completes. +pub fn lfence() { + unsafe { llvm_asm!("sfence" ::: "memory") }; +}
\ No newline at end of file @@ -33,6 +33,7 @@ pub mod task; pub mod time; pub mod tlb; pub mod vmx; +pub mod fence; #[cfg(feature = "performance-counter")] pub mod perfcnt; |