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/* SPDX-License-Identifier: GPL-2.0 */ /* * include/asm/irqflags.h * * IRQ flags handling * * This file gets included from lowlevel asm headers too, to provide * wrapped versions of the local_irq_*() APIs, based on the * arch_local_irq_*() functions from the lowlevel headers. */ #ifndef _ASM_IRQFLAGS_H #define _ASM_IRQFLAGS_H #include <asm/pil.h> #ifndef __ASSEMBLY__ static inline notrace unsigned long arch_local_save_flags(void) { unsigned long flags; __asm__ __volatile__( "rdpr %%pil, %0" : "=r" (flags) ); return flags; } static inline notrace void arch_local_irq_restore(unsigned long flags) { __asm__ __volatile__( "wrpr %0, %%pil" : /* no output */ : "r" (flags) : "memory" ); } static inline notrace void arch_local_irq_disable(void) { __asm__ __volatile__( "wrpr %0, %%pil" : /* no outputs */ : "i" (PIL_NORMAL_MAX) : "memory" ); } static inline notrace void arch_local_irq_enable(void) { __asm__ __volatile__( "wrpr 0, %%pil" : /* no outputs */ : /* no inputs */ : "memory" ); } static inline notrace int arch_irqs_disabled_flags(unsigned long flags) { return (flags > 0); } static inline notrace int arch_irqs_disabled(void) { return arch_irqs_disabled_flags(arch_local_save_flags()); } static inline notrace unsigned long arch_local_irq_save(void) { unsigned long flags, tmp; /* Disable interrupts to PIL_NORMAL_MAX unless we already * are using PIL_NMI, in which case PIL_NMI is retained. * * The only values we ever program into the %pil are 0, * PIL_NORMAL_MAX and PIL_NMI. * * Since PIL_NMI is the largest %pil value and all bits are * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX * actually is. */ __asm__ __volatile__( "rdpr %%pil, %0\n\t" "or %0, %2, %1\n\t" "wrpr %1, 0x0, %%pil" : "=r" (flags), "=r" (tmp) : "i" (PIL_NORMAL_MAX) : "memory" ); return flags; } #endif /* (__ASSEMBLY__) */ #endif /* !(_ASM_IRQFLAGS_H) */
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