83 lines
2 KiB
C
83 lines
2 KiB
C
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/*
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* Xtensa IRQ flags handling functions
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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* Copyright (C) 2015 Cadence Design Systems Inc.
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*/
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#ifndef _XTENSA_IRQFLAGS_H
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#define _XTENSA_IRQFLAGS_H
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#include <linux/types.h>
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#include <asm/processor.h>
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static inline unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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asm volatile("rsr %0, ps" : "=a" (flags));
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return flags;
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}
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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#if XTENSA_FAKE_NMI
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#if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL
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unsigned long tmp;
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asm volatile("rsr %0, ps\t\n"
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"extui %1, %0, 0, 4\t\n"
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"bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n"
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"rsil %0, "__stringify(LOCKLEVEL)"\n"
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"1:"
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: "=a" (flags), "=a" (tmp) :: "memory");
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#else
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asm volatile("rsr %0, ps\t\n"
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"or %0, %0, %1\t\n"
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"xsr %0, ps\t\n"
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"rsync"
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: "=&a" (flags) : "a" (LOCKLEVEL) : "memory");
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#endif
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#else
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asm volatile("rsil %0, "__stringify(LOCKLEVEL)
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: "=a" (flags) :: "memory");
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#endif
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return flags;
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}
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static inline void arch_local_irq_disable(void)
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{
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arch_local_irq_save();
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}
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static inline void arch_local_irq_enable(void)
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{
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unsigned long flags;
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asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
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}
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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asm volatile("wsr %0, ps; rsync"
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:: "a" (flags) : "memory");
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}
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static inline bool arch_irqs_disabled_flags(unsigned long flags)
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{
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#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
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#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
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#endif
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return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
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}
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static inline bool arch_irqs_disabled(void)
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{
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return arch_irqs_disabled_flags(arch_local_save_flags());
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}
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#endif /* _XTENSA_IRQFLAGS_H */
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