Start of serious allocator work.

1 files changed, 14 insertions, 1 deletions

diff --git a/crates/kernel/src/arch/riscv64/mod.rs b/crates/kernel/src/arch/riscv64/mod.rs
index 011e244..48718c2 100644
--- a/crates/kernel/src/arch/riscv64/mod.rs
+++ b/crates/kernel/src/arch/riscv64/mod.rs
@@ -1,9 +1,22 @@
+use crate::cpu_locals::CPULocals;
+use core::{arch::asm, ptr::NonNull};
+
 pub mod interrupts;
 pub mod paging;
 
+/// Returns a pointer to the per-CPU locals.
+pub fn get_cpu_locals() -> NonNull<CPULocals> {
+    // SAFETY: The entrypoint sets this up, and safe code cannot invalidate it.
+    unsafe {
+        let tp;
+        asm!("mv {out}, tp", out = out(reg) tp);
+        NonNull::new_unchecked(tp)
+    }
+}
+
 /// Halts the hart.
 pub fn sleep_forever() -> ! {
     loop {
-        unsafe { core::arch::asm!("wfi") }
+        unsafe { asm!("wfi") }
     }
 }