irq_lock.h

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#ifndef __HAL__CPU__IRQ_H__
#define __HAL__CPU__IRQ_H__
 
#include <type.h>
 
static inline uintptr_t irq_save(void) {
    uintptr_t flags;
    __asm__ volatile(
        "pushfq         \n\t" /* push RFLAGS ke stack             */
        "pop  %0        \n\t" /* baca ke 'flags'                  */
        "cli            \n\t" /* clear IF — disable interrupt     */
        : "=r"(flags)
        :
        : "memory" /* barrier: compiler tidak boleh
                                   reorder load/store melewati CLI  */
    );
    return flags;
}
 
static inline void irq_restore(uintptr_t flags) {
    __asm__ volatile(
        "push %0        \n\t" /* push nilai flags lama ke stack   */
        "popfq          \n\t" /* restore ke RFLAGS secara atomik  */
        :
        : "r"(flags)
        : "memory", "cc" /* cc: condition codes bisa berubah */
    );
}
 
static inline void irq_enable(void) {
    __asm__ volatile("sti" ::: "memory");
}
 
static inline void irq_disable(void) {
    __asm__ volatile("cli" ::: "memory");
}
 
/* Cek apakah interrupt sedang aktif (IF set di RFLAGS) */
static inline bool irq_is_enabled(void) {
    uintptr_t flags;
    __asm__ volatile("pushfq \n\t"
             "pop %0 \n\t"
             : "=r"(flags));
    return (flags & (1UL << 9)) != 0; /* bit 9 = IF */
}
 
#endif // irq