13 lines
390 B
C
13 lines
390 B
C
#include <sys/spin_lock.h>
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/// Relax the spinlock using AMD64 pause instruction
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void spin_lock_relax(void) { __asm__ volatile("pause" ::: "memory"); }
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void spin_lock_save_flags(uint64_t* flags) {
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__asm__ volatile("pushfq; cli; popq %0" : "=rm"(*flags)::"memory");
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}
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void spin_lock_restore_flags(uint64_t flags) {
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__asm__ volatile("pushq %0; popfq" ::"rm"(flags) : "memory", "cc");
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}
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