cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irqflags.h (1810B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 *    Copyright IBM Corp. 2006, 2010
      4 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
      5 */
      6
      7#ifndef __ASM_IRQFLAGS_H
      8#define __ASM_IRQFLAGS_H
      9
     10#include <linux/types.h>
     11
     12#define ARCH_IRQ_ENABLED	(3UL << (BITS_PER_LONG - 8))
     13
     14/* store then OR system mask. */
     15#define __arch_local_irq_stosm(__or)					\
     16({									\
     17	unsigned long __mask;						\
     18	asm volatile(							\
     19		"	stosm	%0,%1"					\
     20		: "=Q" (__mask) : "i" (__or) : "memory");		\
     21	__mask;								\
     22})
     23
     24/* store then AND system mask. */
     25#define __arch_local_irq_stnsm(__and)					\
     26({									\
     27	unsigned long __mask;						\
     28	asm volatile(							\
     29		"	stnsm	%0,%1"					\
     30		: "=Q" (__mask) : "i" (__and) : "memory");		\
     31	__mask;								\
     32})
     33
     34/* set system mask. */
     35static __always_inline void __arch_local_irq_ssm(unsigned long flags)
     36{
     37	asm volatile("ssm   %0" : : "Q" (flags) : "memory");
     38}
     39
     40static __always_inline unsigned long arch_local_save_flags(void)
     41{
     42	return __arch_local_irq_stnsm(0xff);
     43}
     44
     45static __always_inline unsigned long arch_local_irq_save(void)
     46{
     47	return __arch_local_irq_stnsm(0xfc);
     48}
     49
     50static __always_inline void arch_local_irq_disable(void)
     51{
     52	arch_local_irq_save();
     53}
     54
     55static __always_inline void arch_local_irq_enable(void)
     56{
     57	__arch_local_irq_stosm(0x03);
     58}
     59
     60/* This only restores external and I/O interrupt state */
     61static __always_inline void arch_local_irq_restore(unsigned long flags)
     62{
     63	/* only disabled->disabled and disabled->enabled is valid */
     64	if (flags & ARCH_IRQ_ENABLED)
     65		arch_local_irq_enable();
     66}
     67
     68static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
     69{
     70	return !(flags & ARCH_IRQ_ENABLED);
     71}
     72
     73static __always_inline bool arch_irqs_disabled(void)
     74{
     75	return arch_irqs_disabled_flags(arch_local_save_flags());
     76}
     77
     78#endif /* __ASM_IRQFLAGS_H */