continue documentation

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/riscv64/kernel/cpu.c b/arch/riscv64/kernel/cpu.c
index 0558040..91b39b6 100644
--- a/arch/riscv64/kernel/cpu.c
+++ b/arch/riscv64/kernel/cpu.c
@@ -3,9 +3,17 @@
  * riscv64 implementation of cpu handling.
  */
 
+#include <apos/tcb.h>
 #include <arch/cpu.h>
 
 id_t cpu_id()
 {
-	return 0; /* VERY MUCH TEMP */
+	/* yes, slightly weird situation where cur_tcb() call cpu_id() which
+	 * gets the current tcb and returns the cpu id in the tcb, so that that
+	 * id can be used to get the tcb we want. I might try to work out
+	 * something slightly smarter, although this is likely not going to have
+	 * basically any kind of importance for perfomance. */
+	struct tcb *t;
+	__asm__ volatile ("mv %0, tp\n" : "=r" (t) ::);
+	return t->cpu_id;
 }