1 files changed, 49 insertions, 0 deletions
diff --git a/library/stdarch/crates/core_arch/src/riscv64/mod.rs b/library/stdarch/crates/core_arch/src/riscv64/mod.rs
new file mode 100644
index 000000000..751b9a860
--- /dev/null
+++ b/library/stdarch/crates/core_arch/src/riscv64/mod.rs
@@ -0,0 +1,49 @@
+//! RISC-V RV64 specific intrinsics
+use crate::arch::asm;
+
+/// Loads virtual machine memory by unsigned word integer
+///
+/// This instruction performs an explicit memory access as though `V=1`;
+/// i.e., with the address translation and protection, and the endianness, that apply to memory
+/// accesses in either VS-mode or VU-mode.
+///
+/// This operation is not available under RV32 base instruction set.
+///
+/// This function is unsafe for it accesses the virtual supervisor or user via a `HLV.WU`
+/// instruction which is effectively a dereference to any memory address.
+#[inline]
+pub unsafe fn hlv_wu(src: *const u32) -> u32 {
+    let value: u32;
+    asm!(".insn i 0x73, 0x4, {}, {}, 0x681", out(reg) value, in(reg) src, options(readonly, nostack));
+    value
+}
+
+/// Loads virtual machine memory by double integer
+///
+/// This instruction performs an explicit memory access as though `V=1`;
+/// i.e., with the address translation and protection, and the endianness, that apply to memory
+/// accesses in either VS-mode or VU-mode.
+///
+/// This operation is not available under RV32 base instruction set.
+///
+/// This function is unsafe for it accesses the virtual supervisor or user via a `HLV.D`
+/// instruction which is effectively a dereference to any memory address.
+#[inline]
+pub unsafe fn hlv_d(src: *const i64) -> i64 {
+    let value: i64;
+    asm!(".insn i 0x73, 0x4, {}, {}, 0x6C0", out(reg) value, in(reg) src, options(readonly, nostack));
+    value
+}
+
+/// Stores virtual machine memory by double integer
+///
+/// This instruction performs an explicit memory access as though `V=1`;
+/// i.e., with the address translation and protection, and the endianness, that apply to memory
+/// accesses in either VS-mode or VU-mode.
+///
+/// This function is unsafe for it accesses the virtual supervisor or user via a `HSV.D`
+/// instruction which is effectively a dereference to any memory address.
+#[inline]
+pub unsafe fn hsv_d(dst: *mut i64, src: i64) {
+    asm!(".insn r 0x73, 0x4, 0x37, x0, {}, {}", in(reg) dst, in(reg) src, options(nostack));
+}