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powerpc/fsl: Add macro to flush the branch predictor

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commit 1cbf8990d7 upstream.

The BUCSR register can be used to invalidate the entries in the
branch prediction mechanisms.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Diana Craciun 2019-03-29 22:26:09 +11:00 committed by Greg Kroah-Hartman
parent d67ab3d9a1
commit 4944f1d48d
1 changed files with 10 additions and 0 deletions
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10
arch/powerpc/include/asm/ppc_asm.h
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@ -821,4 +821,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
stringify_in_c(.long (_target) - . ;) \
stringify_in_c(.previous)
#ifdef CONFIG_PPC_FSL_BOOK3E
#define BTB_FLUSH(reg) \
lis reg,BUCSR_INIT@h; \
ori reg,reg,BUCSR_INIT@l; \
mtspr SPRN_BUCSR,reg; \
isync;
#else
#define BTB_FLUSH(reg)
#endif /* CONFIG_PPC_FSL_BOOK3E */
#endif /* _ASM_POWERPC_PPC_ASM_H */