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
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