library/stdarch/crates/core_arch/src/riscv64/mod.rs

   1 //! RISC-V RV64 specific intrinsics
   2 use crate::arch::asm;
   3
   4 mod zk;
   5
   6 pub use zk::*;
   7
   8 /// Loads virtual machine memory by unsigned word integer
   9 ///
  10 /// This instruction performs an explicit memory access as though `V=1`;
  11 /// i.e., with the address translation and protection, and the endianness, that apply to memory
  12 /// accesses in either VS-mode or VU-mode.
  13 ///
  14 /// This operation is not available under RV32 base instruction set.
  15 ///
  16 /// This function is unsafe for it accesses the virtual supervisor or user via a `HLV.WU`
  17 /// instruction which is effectively a dereference to any memory address.
  18 #[inline]
  19 pub unsafe fn hlv_wu(src: *const u32) -> u32 {
  20     let value: u32;
  21     asm!(".insn i 0x73, 0x4, {}, {}, 0x681", out(reg) value, in(reg) src, options(readonly, nostack));
  22     value
  23 }
  24
  25 /// Loads virtual machine memory by double integer
  26 ///
  27 /// This instruction performs an explicit memory access as though `V=1`;
  28 /// i.e., with the address translation and protection, and the endianness, that apply to memory
  29 /// accesses in either VS-mode or VU-mode.
  30 ///
  31 /// This operation is not available under RV32 base instruction set.
  32 ///
  33 /// This function is unsafe for it accesses the virtual supervisor or user via a `HLV.D`
  34 /// instruction which is effectively a dereference to any memory address.
  35 #[inline]
  36 pub unsafe fn hlv_d(src: *const i64) -> i64 {
  37     let value: i64;
  38     asm!(".insn i 0x73, 0x4, {}, {}, 0x6C0", out(reg) value, in(reg) src, options(readonly, nostack));
  39     value
  40 }
  41
  42 /// Stores virtual machine memory by double integer
  43 ///
  44 /// This instruction performs an explicit memory access as though `V=1`;
  45 /// i.e., with the address translation and protection, and the endianness, that apply to memory
  46 /// accesses in either VS-mode or VU-mode.
  47 ///
  48 /// This function is unsafe for it accesses the virtual supervisor or user via a `HSV.D`
  49 /// instruction which is effectively a dereference to any memory address.
  50 #[inline]
  51 pub unsafe fn hsv_d(dst: *mut i64, src: i64) {
  52     asm!(".insn r 0x73, 0x4, 0x37, x0, {}, {}", in(reg) dst, in(reg) src, options(nostack));
  53 }