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