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    Subject[RFC v6 14/62] powerpc: helper function to read,write AMR,IAMR,UAMOR registers
    Date
    Implements helper functions to read and write the key related
    registers; AMR, IAMR, UAMOR.

    AMR register tracks the read,write permission of a key
    IAMR register tracks the execute permission of a key
    UAMOR register enables and disables a key

    Signed-off-by: Ram Pai <linuxram@us.ibm.com>
    ---
    arch/powerpc/include/asm/book3s/64/pgtable.h | 26 ++++++++++++++++++++++++++
    1 files changed, 26 insertions(+), 0 deletions(-)

    diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
    index 85bc987..d4da0e9 100644
    --- a/arch/powerpc/include/asm/book3s/64/pgtable.h
    +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
    @@ -428,6 +428,32 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
    pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1);
    }

    +#include <asm/reg.h>
    +static inline u64 read_amr(void)
    +{
    + return mfspr(SPRN_AMR);
    +}
    +static inline void write_amr(u64 value)
    +{
    + mtspr(SPRN_AMR, value);
    +}
    +static inline u64 read_iamr(void)
    +{
    + return mfspr(SPRN_IAMR);
    +}
    +static inline void write_iamr(u64 value)
    +{
    + mtspr(SPRN_IAMR, value);
    +}
    +static inline u64 read_uamor(void)
    +{
    + return mfspr(SPRN_UAMOR);
    +}
    +static inline void write_uamor(u64 value)
    +{
    + mtspr(SPRN_UAMOR, value);
    +}
    +
    #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
    static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
    unsigned long addr, pte_t *ptep)
    --
    1.7.1
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