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Commit 34bd92e2 authored by Kevin Cernekee's avatar Kevin Cernekee Committed by Ralf Baechle
Browse files

MIPS: Add NMI notifier 



Allow the board support code to register a raw notifier callback for
NMI, similar to what is done for CU2 exceptions.

Signed-off-by: default avatarKevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2958/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 18a1eef9

arch/mips/include/asm/traps.h

+12 −0
Original line number Diff line number Diff line
@@ -25,4 +25,16 @@ extern void (*board_nmi_handler_setup)(void); 
extern void (*board_ejtag_handler_setup)(void);

extern void (*board_bind_eic_interrupt)(int irq, int regset);



extern int register_nmi_notifier(struct notifier_block *nb);



#define nmi_notifier(fn, pri)						\

({									\

	static struct notifier_block fn##_nb = {			\

		.notifier_call = fn,					\

		.priority = pri						\

	};								\

									\

	register_nmi_notifier(&fn##_nb);				\

})



#endif /* _ASM_TRAPS_H */

arch/mips/kernel/traps.c

+9 −0
Original line number Diff line number Diff line
@@ -1339,9 +1339,18 @@ void ejtag_exception_handler(struct pt_regs *regs) 


/*

 * NMI exception handler.

 * No lock; only written during early bootup by CPU 0.

 */

static RAW_NOTIFIER_HEAD(nmi_chain);



int register_nmi_notifier(struct notifier_block *nb)

{

	return raw_notifier_chain_register(&nmi_chain, nb);

}



NORET_TYPE void ATTRIB_NORET nmi_exception_handler(struct pt_regs *regs)

{

	raw_notifier_call_chain(&nmi_chain, 0, regs);

	bust_spinlocks(1);

	printk("NMI taken!!!!\n");

	die("NMI", regs);