Add riscv crate

Cargo.lock

@@ -8,11 +8,24 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
 
+[[package]]
+name = "critical-section"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
+
+[[package]]
+name = "embedded-hal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
 [[package]]
 name = "kernel"
 version = "0.1.0"
 dependencies = [
  "linked_list_allocator",
+ "riscv",
  "spinning_top 0.3.0",
 ]
 
@@ -35,6 +48,16 @@ dependencies = [
  "scopeguard",
 ]
 
+[[package]]
+name = "riscv"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f5c1b8bf41ea746266cdee443d1d1e9125c86ce1447e1a2615abd34330d33a9"
+dependencies = [
+ "critical-section",
+ "embedded-hal",
+]
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"

Cargo.toml

@@ -5,4 +5,5 @@ edition = "2021"
 
 [dependencies]
 linked_list_allocator = "0.10.5"
+riscv = "0.11.1"
 spinning_top = "0.3.0"