From 1b4037deadb64e3a26c02f0e9852c257ee92a6e3 Mon Sep 17 00:00:00 2001 From: Ram Pai Date: Thu, 18 Jan 2018 17:50:26 -0800 Subject: [PATCH] powerpc: helper function to read, write AMR, IAMR, UAMOR registers 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 Reviewed-by: Thiago Jung Bauermann Signed-off-by: Ram Pai Signed-off-by: Michael Ellerman --- arch/powerpc/mm/pkeys.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c index e68e367dcdd7..afa6d0d63f32 100644 --- a/arch/powerpc/mm/pkeys.c +++ b/arch/powerpc/mm/pkeys.c @@ -67,3 +67,39 @@ void pkey_mm_init(struct mm_struct *mm) return; mm_pkey_allocation_map(mm) = initial_allocation_mask; } + +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); +} -- 2.30.2