From: Diana Craciun <diana.craciun@xxxxxxx> 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@xxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 */
