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 (2096B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * IRQ flags defines.
      4 *
      5 * Copyright (C) 1998-2003 Hewlett-Packard Co
      6 *	David Mosberger-Tang <davidm@hpl.hp.com>
      7 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
      8 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
      9 */
     10
     11#ifndef _ASM_IA64_IRQFLAGS_H
     12#define _ASM_IA64_IRQFLAGS_H
     13
     14#include <asm/pal.h>
     15#include <asm/kregs.h>
     16
     17#ifdef CONFIG_IA64_DEBUG_IRQ
     18extern unsigned long last_cli_ip;
     19static inline void arch_maybe_save_ip(unsigned long flags)
     20{
     21	if (flags & IA64_PSR_I)
     22		last_cli_ip = ia64_getreg(_IA64_REG_IP);
     23}
     24#else
     25#define arch_maybe_save_ip(flags) do {} while (0)
     26#endif
     27
     28/*
     29 * - clearing psr.i is implicitly serialized (visible by next insn)
     30 * - setting psr.i requires data serialization
     31 * - we need a stop-bit before reading PSR because we sometimes
     32 *   write a floating-point register right before reading the PSR
     33 *   and that writes to PSR.mfl
     34 */
     35
     36static inline unsigned long arch_local_save_flags(void)
     37{
     38	ia64_stop();
     39	return ia64_getreg(_IA64_REG_PSR);
     40}
     41
     42static inline unsigned long arch_local_irq_save(void)
     43{
     44	unsigned long flags = arch_local_save_flags();
     45
     46	ia64_stop();
     47	ia64_rsm(IA64_PSR_I);
     48	arch_maybe_save_ip(flags);
     49	return flags;
     50}
     51
     52static inline void arch_local_irq_disable(void)
     53{
     54#ifdef CONFIG_IA64_DEBUG_IRQ
     55	arch_local_irq_save();
     56#else
     57	ia64_stop();
     58	ia64_rsm(IA64_PSR_I);
     59#endif
     60}
     61
     62static inline void arch_local_irq_enable(void)
     63{
     64	ia64_stop();
     65	ia64_ssm(IA64_PSR_I);
     66	ia64_srlz_d();
     67}
     68
     69static inline void arch_local_irq_restore(unsigned long flags)
     70{
     71#ifdef CONFIG_IA64_DEBUG_IRQ
     72	unsigned long old_psr = arch_local_save_flags();
     73#endif
     74	ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
     75	arch_maybe_save_ip(old_psr & ~flags);
     76}
     77
     78static inline bool arch_irqs_disabled_flags(unsigned long flags)
     79{
     80	return (flags & IA64_PSR_I) == 0;
     81}
     82
     83static inline bool arch_irqs_disabled(void)
     84{
     85	return arch_irqs_disabled_flags(arch_local_save_flags());
     86}
     87
     88static inline void arch_safe_halt(void)
     89{
     90	arch_local_irq_enable();
     91	ia64_pal_halt_light();	/* PAL_HALT_LIGHT */
     92}
     93
     94
     95#endif /* _ASM_IA64_IRQFLAGS_H */