Add riscv64 support

Co-authored-by: Martin Kröning <[email protected]>
Signed-off-by: Martin Kröning <[email protected]>

Cargo.toml

@@ -9,3 +9,6 @@ members = [
     "examples/demo",
 ]
 exclude = ["target", "loader", "libhermit-rs"]
+
+[patch.crates-io]
+num_cpus = { git = "https://github.com/simonschoening/num_cpus.git" }

benches/micro/Cargo.toml

@@ -16,6 +16,9 @@ default-features = false
 aarch64 = { version = "0.0.7", default-features = false }
 tock-registers = "0.7"
 
+[target.'cfg(target_arch = "riscv64")'.dependencies]
+riscv = "0.10"
+
 [target.'cfg(target_os = "linux")'.dependencies]
 syscalls = { version = "0.5", default-features = false }
 

benches/micro/src/benches/mod.rs

@@ -39,6 +39,12 @@ fn get_timestamp() -> u64 {
 	aarch64::regs::CNTPCT_EL0.get()
 }
 
+#[cfg(target_arch = "riscv64")]
+#[inline]
+fn get_timestamp() -> u64 {
+	riscv::register::time::read64()
+}
+
 extern "C" {
 	#[cfg(target_os = "hermit")]
 	fn sys_getpid() -> u32;

hermit-sys/Cargo.toml

@@ -54,6 +54,9 @@ lazy_static = { version = "1.4", optional = true }
 
 rftrace = { version = "0.1", optional = true, features = ["autokernel", "buildcore", "interruptsafe"] }
 
+[target.'cfg(target_arch = "riscv64")'.dependencies]
+riscv = "0.10"
+
 [dependencies.smoltcp]
 version = "0.7"
 optional = true

hermit-sys/src/net/mod.rs

@@ -353,6 +353,11 @@ fn start_endpoint() -> u16 {
 	(CNTPCT_EL0.get() % (u16::MAX as u64)).try_into().unwrap()
 }
 
+#[cfg(target_arch = "riscv64")]
+fn start_endpoint() -> u16 {
+	(riscv::register::time::read64() % (u16::MAX as u64)).try_into().unwrap()
+}
+
 pub(crate) fn network_delay(timestamp: Instant) -> Option<Duration> {
 	NIC.lock().unwrap().as_nic_mut().ok()?.poll_delay(timestamp)
 }