Commit 0603839b authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Add exception/interrupt handling 



Add the exception and interrupt handling machanism for basic LoongArch
support.

Reviewed-by: default avatarWANG Xuerui <git@xen0n.name>
Reviewed-by: default avatarJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 628c3bb4

arch/loongarch/include/asm/branch.h

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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

 */

#ifndef _ASM_BRANCH_H

#define _ASM_BRANCH_H



#include <asm/ptrace.h>



static inline unsigned long exception_era(struct pt_regs *regs)

{

	return regs->csr_era;

}



static inline int compute_return_era(struct pt_regs *regs)

{

	regs->csr_era += 4;

	return 0;

}



#endif /* _ASM_BRANCH_H */

arch/loongarch/include/asm/bug.h

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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __ASM_BUG_H

#define __ASM_BUG_H



#include <linux/compiler.h>



#ifdef CONFIG_BUG



#include <asm/break.h>



static inline void __noreturn BUG(void)

{

	__asm__ __volatile__("break %0" : : "i" (BRK_BUG));

	unreachable();

}



#define HAVE_ARCH_BUG



#endif



#include <asm-generic/bug.h>



#endif /* __ASM_BUG_H */

arch/loongarch/include/asm/entry-common.h

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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef ARCH_LOONGARCH_ENTRY_COMMON_H

#define ARCH_LOONGARCH_ENTRY_COMMON_H



#include <linux/sched.h>

#include <linux/processor.h>



static inline bool on_thread_stack(void)

{

	return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));

}



#endif

arch/loongarch/include/asm/hardirq.h

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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

 */

#ifndef _ASM_HARDIRQ_H

#define _ASM_HARDIRQ_H



#include <linux/cache.h>

#include <linux/threads.h>

#include <linux/irq.h>



extern void ack_bad_irq(unsigned int irq);

#define ack_bad_irq ack_bad_irq



#define NR_IPI	2



typedef struct {

	unsigned int ipi_irqs[NR_IPI];

	unsigned int __softirq_pending;

} ____cacheline_aligned irq_cpustat_t;



DECLARE_PER_CPU_ALIGNED(irq_cpustat_t, irq_stat);



#endif /* _ASM_HARDIRQ_H */

arch/loongarch/include/asm/hw_irq.h

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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

 */

#ifndef __ASM_HW_IRQ_H

#define __ASM_HW_IRQ_H



#include <linux/atomic.h>



extern atomic_t irq_err_count;



/*

 * interrupt-retrigger: NOP for now. This may not be appropriate for all

 * machines, we'll see ...

 */



#endif /* __ASM_HW_IRQ_H */