spinlocks

1 files changed, 34 insertions, 0 deletions

diff --git a/kernel/spinlock.c b/kernel/spinlock.c
new file mode 100644
index 0000000..c7f5062
--- /dev/null
+++ b/kernel/spinlock.c
@@ -0,0 +1,34 @@
+#define FOOLOS_MODULE_NAME "spinlock"
+
+#include "lib/logger/log.h"
+#include "lib/int/stdint.h"
+
+typedef uint8_t spinlock;
+
+volatile spinlock spinlocks[16];
+
+
+void init_spinlocks()
+{
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Initializing spinlocks at 0x%08X ",spinlocks);
+    for(int i=0;i<16;i++)spinlocks[i]=0;
+}
+
+volatile void lock_spin(int i)
+{
+
+    spinlock *addr=spinlocks+i;
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"locking %d (0x%08X)",i,addr);
+    
+    while(x86_xchg(addr,1));
+}
+
+void lock_release(int i)
+{
+
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_FINE,"unlocking %d",i);
+    spinlock *addr=spinlocks+i;
+
+    asm("movb $0,%0"::"m"(*addr));
+
+}