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ppc/85xx: Disable all async interrupt sources when we boot

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We should make sure to clear MSR[ME, CE, DE] when we boot an OS image
since we have changed the exception vectors and the OSes vectors might
not be setup we should avoid async interrupts at all costs.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2009-09-11 15:28:41 -05:00
parent 9f00409a9d
commit 15fba3279b
1 changed files with 11 additions and 0 deletions
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11
cpu/mpc85xx/cpu_init.c
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@ -364,5 +364,16 @@ extern void setup_ivors(void);
void arch_preboot_os(void)
{
u32 msr;
/*
* We are changing interrupt offsets and are about to boot the OS so
* we need to make sure we disable all async interrupts. EE is already
* disabled by the time we get called.
*/
msr = mfmsr();
msr &= ~(MSR_ME|MSR_CE|MSR_DE);
mtmsr(msr);
setup_ivors();
}