From af1ce4b2e637ceb418ea72d51c49a3eee276a938 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Sat, 15 Apr 2023 05:02:02 +0000
Subject: added multiprocessor support

---
 sys/kern/spinlock.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

(limited to 'sys/kern/spinlock.c')

diff --git a/sys/kern/spinlock.c b/sys/kern/spinlock.c
index a35b8ce..ade270f 100644
--- a/sys/kern/spinlock.c
+++ b/sys/kern/spinlock.c
@@ -1,15 +1,38 @@
+#include <asm.h>
 #include <spinlock.h>
 
 void 
-init_locklock(struct spinlock *l, const char *_name)
+initlock(struct spinlock *l)
 {
-        l->name = _name;
         l->locked = 0;
-        l->cpu = 0;
 }
 
 void 
-acquire_lock(struct spinlock *l) 
+acquire(struct spinlock *l)
 {
-       asm volatile("csrr sie, zero");
+	sie_disable();
+
+	if (l->locked)
+		return;
+
+	while (__sync_lock_test_and_set(&l->locked, 1))
+			;
+
+	__sync_synchronize();
+}
+
+void 
+release(struct spinlock *l) 
+{
+	sie_disable(); // avoid deadlock
+
+	if (l->locked)
+		return;  // interrupts are still disabled, what to do here?
+
+	/* fence */
+	__sync_synchronize();
+
+	__sync_lock_release(&l->locked);
+
+	sie_enable();
 }
-- 
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