From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- .../stdarch/crates/core_arch/src/x86_64/rdrand.rs | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 library/stdarch/crates/core_arch/src/x86_64/rdrand.rs (limited to 'library/stdarch/crates/core_arch/src/x86_64/rdrand.rs') diff --git a/library/stdarch/crates/core_arch/src/x86_64/rdrand.rs b/library/stdarch/crates/core_arch/src/x86_64/rdrand.rs new file mode 100644 index 000000000..e5ec933fb --- /dev/null +++ b/library/stdarch/crates/core_arch/src/x86_64/rdrand.rs @@ -0,0 +1,44 @@ +//! RDRAND and RDSEED instructions for returning random numbers from an Intel +//! on-chip hardware random number generator which has been seeded by an +//! on-chip entropy source. + +#![allow(clippy::module_name_repetitions)] + +#[allow(improper_ctypes)] +extern "unadjusted" { + #[link_name = "llvm.x86.rdrand.64"] + fn x86_rdrand64_step() -> (u64, i32); + #[link_name = "llvm.x86.rdseed.64"] + fn x86_rdseed64_step() -> (u64, i32); +} + +#[cfg(test)] +use stdarch_test::assert_instr; + +/// Read a hardware generated 64-bit random value and store the result in val. +/// Returns 1 if a random value was generated, and 0 otherwise. +/// +/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdrand64_step) +#[inline] +#[target_feature(enable = "rdrand")] +#[cfg_attr(test, assert_instr(rdrand))] +#[stable(feature = "simd_x86", since = "1.27.0")] +pub unsafe fn _rdrand64_step(val: &mut u64) -> i32 { + let (v, flag) = x86_rdrand64_step(); + *val = v; + flag +} + +/// Read a 64-bit NIST SP800-90B and SP800-90C compliant random value and store +/// in val. Return 1 if a random value was generated, and 0 otherwise. +/// +/// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_rdseed64_step) +#[inline] +#[target_feature(enable = "rdseed")] +#[cfg_attr(test, assert_instr(rdseed))] +#[stable(feature = "simd_x86", since = "1.27.0")] +pub unsafe fn _rdseed64_step(val: &mut u64) -> i32 { + let (v, flag) = x86_rdseed64_step(); + *val = v; + flag +} -- cgit v1.2.3