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powerpc: Setup BHRB instructions facility in HFSCR for POWER8

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Make BHRB instructions available in problem and privileged states.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anshuman Khandual 2013-04-25 20:54:55 +00:00 committed by Benjamin Herrenschmidt
parent fc2a6cfe05
commit 53b56ca019
2 changed files with 3 additions and 1 deletions
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1
arch/powerpc/include/asm/reg.h
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@ -272,6 +272,7 @@
#define HFSCR_TAR (1 << (63-55)) /* Enable Target Address Register */
#define HFSCR_TM (1 << (63-58)) /* Enable Transactional Memory */
#define HFSCR_PM (1 << (63-60)) /* Enable prob/priv access to PMU SPRs */
#define HFSCR_BHRB (1 << (63-59)) /* Enable Branch History Rolling Buffer*/
#define HFSCR_DSCR (1 << (63-61)) /* Enable Data Stream Control Register */
#define HFSCR_VECVSX (1 << (63-62)) /* Enable VMX/VSX */
#define HFSCR_FP (1 << (63-63)) /* Enable Floating Point */

3
arch/powerpc/kernel/cpu_setup_power.S
View file

@ -129,7 +129,8 @@ __init_FSCR:
__init_HFSCR:
mfspr r3,SPRN_HFSCR
ori r3,r3,HFSCR_TAR|HFSCR_TM|HFSCR_DSCR|HFSCR_VECVSX|HFSCR_FP|HFSCR_PM
ori r3,r3,HFSCR_TAR|HFSCR_TM|HFSCR_BHRB|HFSCR_PM|\
HFSCR_DSCR|HFSCR_VECVSX|HFSCR_FP
mtspr SPRN_HFSCR,r3
blr