diff options
| author | Kevin Cernekee <cernekee@gmail.com> | 2011-11-16 01:25:44 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2011-12-07 22:03:18 +0000 |
| commit | 34bd92e27becdc2c8b50d200a329da5e9b8174d9 (patch) | |
| tree | 80379235839035261bbdc239dc517beeeadba2f1 | |
| parent | 18a1eef92dcd6b8ec30fcbe6e074e5d33ef31c02 (diff) | |
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: 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>
| -rw-r--r-- | arch/mips/include/asm/traps.h | 12 | ||||
| -rw-r--r-- | arch/mips/kernel/traps.c | 9 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/mips/include/asm/traps.h b/arch/mips/include/asm/traps.h index 90ff2f497c50..4edab87eebd2 100644 --- a/arch/mips/include/asm/traps.h +++ b/arch/mips/include/asm/traps.h @@ -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 */ diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index 5c8a49d55054..33945aaa9b1b 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -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); |