kernel: spinlocks

kernel-src/include/kernel/slab.h

@@ -3,6 +3,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <spinlock.h>
 
 typedef struct slab_t {
 	struct slab_t *next;
@@ -13,7 +14,7 @@ typedef struct slab_t {
 } slab_t;
 
 typedef struct scache_t {
-	// TODO lock
+	spinlock_t lock;
 	void (*ctor)(struct scache_t *cache, void *obj);
 	void (*dtor)(struct scache_t *cache, void *obj);
 	slab_t *full;

kernel-src/include/kernel/timer.h

@@ -3,6 +3,7 @@
 
 #include <time.h>
 #include <arch/context.h>
+#include <spinlock.h>
 
 typedef struct timerentry_t {
 	struct timerentry_t *next;
@@ -12,6 +13,7 @@ typedef struct timerentry_t {
 } timerentry_t;
 
 typedef struct {
+	spinlock_t lock;
 	time_t ticksperus;
 	time_t tickcurrent;
 	void (*arm)(time_t);

kernel-src/include/kernel/vmm.h

@@ -2,6 +2,7 @@
 #define _VMM_H
 
 #include <arch/mmu.h>
+#include <spinlock.h>
 
 #define VMM_FLAGS_PAGESIZE 1
 #define VMM_FLAGS_ALLOCATE 2
@@ -29,7 +30,7 @@ typedef struct vmmrange_t{
 } vmmrange_t;
 
 typedef struct {
-	// TODO lock
+	spinlock_t lock;
 	struct vmmcache_t *next;
 	size_t freecount;
 	uintmax_t firstfree;
@@ -43,6 +44,7 @@ typedef struct vmmcache_t {
 } vmmcache_t;
 
 typedef struct {
+	spinlock_t lock;
 	vmmrange_t *ranges;
 	void *start;
 	void *end;

kernel-src/include/spinlock.h

@@ -0,0 +1,22 @@
+#ifndef _SPINLOCK_H
+#define _SPINLOCK_H
+
+#include <stdbool.h>
+
+typedef int spinlock_t;
+
+#define SPINLOCK_INIT(x) x = 0;
+
+static inline void spinlock_acquire(spinlock_t *lock){
+	while(!__sync_bool_compare_and_swap(lock, 0, 1)) asm("pause");
+}
+
+static inline bool spinlock_try(spinlock_t *lock){
+	return __sync_bool_compare_and_swap(lock, 0, 1);
+}
+
+static inline void spinlock_release(spinlock_t *lock){
+	*lock = 0;
+}
+
+#endif