From: Diana Craciun diana.craciun@nxp.com
commit 1cbf8990d79ff69da8ad09e8a3df014e1494462b 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 --- arch/powerpc/include/asm/ppc_asm.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -821,4 +821,15 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,C .long 0x2400004c /* rfid */ #endif /* !CONFIG_PPC_BOOK3E */ #endif /* __ASSEMBLY__ */ + +#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 */