https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 49a57857aeea06ca831043acbb0fa5e0f50602fd authored by Linus Torvalds on 21 January 2019, 00:14:44 UTC
Linux 5.0-rc3
Linux 5.0-rc3
Tip revision: 49a5785
irq.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2012 Regents of the University of California
* Copyright (C) 2017 SiFive
* Copyright (C) 2018 Christoph Hellwig
*/
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/seq_file.h>
#include <asm/smp.h>
/*
* Possible interrupt causes:
*/
#define INTERRUPT_CAUSE_SOFTWARE 1
#define INTERRUPT_CAUSE_TIMER 5
#define INTERRUPT_CAUSE_EXTERNAL 9
/*
* The high order bit of the trap cause register is always set for
* interrupts, which allows us to differentiate them from exceptions
* quickly. The INTERRUPT_CAUSE_* macros don't contain that bit, so we
* need to mask it off.
*/
#define INTERRUPT_CAUSE_FLAG (1UL << (__riscv_xlen - 1))
int arch_show_interrupts(struct seq_file *p, int prec)
{
show_ipi_stats(p, prec);
return 0;
}
asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
irq_enter();
switch (regs->scause & ~INTERRUPT_CAUSE_FLAG) {
case INTERRUPT_CAUSE_TIMER:
riscv_timer_interrupt();
break;
#ifdef CONFIG_SMP
case INTERRUPT_CAUSE_SOFTWARE:
/*
* We only use software interrupts to pass IPIs, so if a non-SMP
* system gets one, then we don't know what to do.
*/
riscv_software_interrupt();
break;
#endif
case INTERRUPT_CAUSE_EXTERNAL:
handle_arch_irq(regs);
break;
default:
panic("unexpected interrupt cause");
}
irq_exit();
set_irq_regs(old_regs);
}
void __init init_IRQ(void)
{
irqchip_init();
}