kernel - v0.7 beta

+ acpi: add acpi support
+ lapic: add lapic support
+ ioapic: add ioapic support
+ arch/x86_64: add support for "syscall"/"sysret"

kernel/src/lib/spinlock.h

@@ -1,17 +1,31 @@
 #pragma once
 
+#include <stdbool.h>
 #include <stdint.h>
 
 typedef struct spinlock {
-  volatile int locked;
+    volatile int locked;
 } spinlock_t;
 
-inline void spinlock_acquire(spinlock_t *lock) {
-  while (__sync_lock_test_and_set(&(lock)->locked, 1))
-    while ((lock)->locked)
-      __asm__ volatile("pause");
+static inline void spinlock_acquire(spinlock_t *lock) {
+    //uint64_t timeout = 1000000;  // Adjust this value based on your needs
+    
+    for (;;) {
+        if (__atomic_exchange_n(&lock->locked, 1, __ATOMIC_ACQUIRE) == 0) {
+            return;
+        }
+        
+        while (__atomic_load_n(&lock->locked, __ATOMIC_RELAXED)) {
+            /**if (--timeout == 0) {
+                // Force unlock after too many attempts
+                __atomic_store_n(&lock->locked, 0, __ATOMIC_RELEASE);
+                continue;
+            }**/
+            __asm__ volatile("pause" ::: "memory");
+        }
+    }
 }
 
-inline void spinlock_release(spinlock_t *lock) {
-  __sync_lock_release(&(lock)->locked);
+static inline void spinlock_release(spinlock_t *lock) {
+    __atomic_store_n(&lock->locked, 0, __ATOMIC_RELEASE);
 }