/*
 * Copyright (c) 2026, Chloe M.
 * Provided under the BSD-3 clause.
 *
 * Description: Kernel entry fence
 * Author:      Chloe M.
 */

#ifndef _MACHINE_KFENCE_H_
#define _MACHINE_KFENCE_H_ 1

/*
 * Kernel fence for interrupt entries that do
 * not have an error code
 */
#define KFENCE              \
    testq $0x3, 8(%rsp)   ; \
    jz 1f                 ; \
    lfence                ; \
    swapgs                ; \
1:  nop

/*
 * Kernel fence for interrupt entries that
 * have an error code
 */
#define KFENCE_EC           \
    testq $0x3, 16(%rsp)  ; \
    jz 1f                 ; \
    lfence                ; \
    swapgs                ; \
1:  nop

#endif  /* !_MACHINE_KFENCE_H_ */