arch/riscv/include/asm/irqflags.h

Source file repositories/reference/linux-study-clean/arch/riscv/include/asm/irqflags.h

File Facts

System
Linux kernel
Corpus path
arch/riscv/include/asm/irqflags.h
Extension
.h
Size
1148 bytes
Lines
55
Domain
Architecture Layer
Bucket
arch/riscv
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_RISCV_IRQFLAGS_H
#define _ASM_RISCV_IRQFLAGS_H

#include <asm/csr.h>

/* read interrupt enabled status */
static inline unsigned long arch_local_save_flags(void)
{
	return csr_read(CSR_STATUS);
}

/* unconditionally enable interrupts */
static inline void arch_local_irq_enable(void)
{
	csr_set(CSR_STATUS, SR_IE);
}

/* unconditionally disable interrupts */
static inline void arch_local_irq_disable(void)
{
	csr_clear(CSR_STATUS, SR_IE);
}

/* get status and disable interrupts */
static inline unsigned long arch_local_irq_save(void)
{
	return csr_read_clear(CSR_STATUS, SR_IE);
}

/* test flags */
static inline int arch_irqs_disabled_flags(unsigned long flags)
{
	return !(flags & SR_IE);
}

/* test hardware interrupt enable bit */
static inline int arch_irqs_disabled(void)
{
	return arch_irqs_disabled_flags(arch_local_save_flags());
}

/* set interrupt enabled status */
static inline void arch_local_irq_restore(unsigned long flags)
{
	csr_set(CSR_STATUS, flags & SR_IE);
}

#endif /* _ASM_RISCV_IRQFLAGS_H */

Annotation

Implementation Notes