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MIPS: Add NMI notifier

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

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2958/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Kevin Cernekee 2011-11-16 01:25:44 +00:00 • committed by Ralf Baechle
parent 18a1eef92d
commit 34bd92e27b
2 changed files with 21 additions and 0 deletions
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12
arch/mips/include/asm/traps.h
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@ -25,4 +25,16 @@ extern void (*board_nmi_handler_setup)(void);
extern void (*board_ejtag_handler_setup)(void); extern void (*board_ejtag_handler_setup)(void);
extern void (*board_bind_eic_interrupt)(int irq, int regset); 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 */ #endif /* _ASM_TRAPS_H */

9
arch/mips/kernel/traps.c
View file

@ -1339,9 +1339,18 @@ void ejtag_exception_handler(struct pt_regs *regs)
/* /*
* NMI exception handler. * 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) NORET_TYPE void ATTRIB_NORET nmi_exception_handler(struct pt_regs *regs)
{ {
raw_notifier_call_chain(&nmi_chain, 0, regs);
bust_spinlocks(1); bust_spinlocks(1);
printk("NMI taken!!!!\n"); printk("NMI taken!!!!\n");
die("NMI", regs); die("NMI", regs);