LXR uboot/arch/arm/thumb1/include/asm/proc-armv/system.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 *  Thumb-1 drop-in for the linux/include/asm-arm/proc-armv/system.h
   4 *
   5 *  (C) Copyright 2015
   6 *  Albert ARIBAUD <albert.u.boot@aribaud.net>
   7 *
   8 * The original file does not build in Thumb mode. However, in U-Boot
   9 * we don't use interrupt context, so we can redefine these as empty
  10 * memory barriers, which makes Thumb-1 compiler happy.
  11 */
  12
  13/*
  14 * Use the same macro name as linux/include/asm-arm/proc-armv/system.h
  15 * here, so that if the original ever gets included after us, it won't
  16 * try to re-redefine anything.
  17 */
  18
  19#ifndef __ASM_PROC_SYSTEM_H
  20#define __ASM_PROC_SYSTEM_H
  21
  22/*
  23 * Redefine all original macros with static inline functions containing
  24 * a simple memory barrier, so that they produce the same instruction
  25 * ordering constraints as their original counterparts.
  26 * We use static inline functions rather than macros so that we can tell
  27 * the compiler to not complain about unused arguments.
  28 */
  29
  30static inline void local_irq_save(
  31        unsigned long flags __attribute__((unused)))
  32{
  33        __asm__ __volatile__ ("" : : : "memory");
  34}
  35
  36static inline void local_irq_enable(void)
  37{
  38        __asm__ __volatile__ ("" : : : "memory");
  39}
  40
  41static inline void local_irq_disable(void)
  42{
  43        __asm__ __volatile__ ("" : : : "memory");
  44}
  45
  46static inline void __stf(void)
  47{
  48        __asm__ __volatile__ ("" : : : "memory");
  49}
  50
  51static inline void __clf(void)
  52{
  53        __asm__ __volatile__ ("" : : : "memory");
  54}
  55
  56static inline void local_save_flags(
  57        unsigned long flags __attribute__((unused)))
  58{
  59        __asm__ __volatile__ ("" : : : "memory");
  60}
  61
  62static inline void local_irq_restore(
  63        unsigned long flags __attribute__((unused)))
  64{
  65        __asm__ __volatile__ ("" : : : "memory");
  66}
  67
  68#endif /*  __ASM_PROC_SYSTEM_H */
  69