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riscv: clear all pending interrupts when booting 

Just in case an old interrupt is pending make sure we clear everything
asserted before this kernel started.  Based on similar M-mode code in
opensbi.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Nick Kossifidis <mick@ics.forth.gr>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-04-15 11:14:36 +02:00 committed by Palmer Dabbelt
parent 09afac77b6
commit df16c40cbf
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1 changed files with 2 additions and 1 deletions
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3
arch/riscv/kernel/head.S
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@ -22,8 +22,9 @@
__INIT
ENTRY(_start)
/* Mask all interrupts */
/* Mask and clear all interrupts */
csrw sie, zero
csrw sip, zero
/* Load the global pointer */
.option push