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UPSTREAM: MIPS: traps: Make sure secondary cores have a sane ebase register

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We shouldn't trust that the secondary cores will have a sane ebase register
(either from the bootloader or during the hardware design phase) so use the
ebase address as calculated by the boot CPU.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Petri Gynther <pgynther@google.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12328/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
(cherry picked from commit 04d83f9485)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Markos Chandras 2016-02-03 03:15:22 +00:00 committed by Amit Pundir
parent 28069b38c1
commit 8da25882af
1 changed files with 7 additions and 0 deletions
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7
arch/mips/kernel/traps.c
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@ -2140,6 +2140,13 @@ void per_cpu_trap_init(bool is_boot_cpu)
* o read IntCtl.IPFDC to determine the fast debug channel interrupt
*/
if (cpu_has_mips_r2_r6) {
/*
* We shouldn't trust a secondary core has a sane EBASE register
* so use the one calculated by the boot CPU.
*/
if (!is_boot_cpu)
write_c0_ebase(ebase);
cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP;
cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7;
cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7;