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 Acked-by: Balbir Singh <bsingharora@xxxxxxxxx> Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxxxxxxx> Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx> --- arch/powerpc/mm/pkeys.c | 36 ++++++++++++++++++++++++++++++++++++ 1 files changed, 36 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c index 512bdf2..b6bdfdf 100644 --- a/arch/powerpc/mm/pkeys.c +++ b/arch/powerpc/mm/pkeys.c @@ -61,3 +61,39 @@ void __init pkey_initialize(void) for (i = 2; i < (pkeys_total - os_reserved); i++) initial_allocation_mask &= ~(0x1 << i); } + +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) +{ + if (!likely(pkey_execute_disable_supported)) + return 0x0UL; + + return mfspr(SPRN_IAMR); +} + +static inline void write_iamr(u64 value) +{ + if (!likely(pkey_execute_disable_supported)) + return; + + 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); +} -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html