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author | Ram Pai <linuxram@us.ibm.com> | 2018-01-18 17:50:26 -0800 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-20 22:58:58 +1100 |
commit | 1b4037deadb64e3a26c02f0e9852c257ee92a6e3 (patch) | |
tree | 9a5ed445bca466f499750ffe6976a4a97fd89456 /arch/powerpc/mm/pkeys.c | |
parent | powerpc: track allocation status of all pkeys (diff) | |
download | linux-dev-1b4037deadb64e3a26c02f0e9852c257ee92a6e3.tar.xz linux-dev-1b4037deadb64e3a26c02f0e9852c257ee92a6e3.zip |
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 <bsingharora@gmail.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pkeys.c')
-rw-r--r-- | 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 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); +} |