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powerpc: helper function to read, write AMR, IAMR, UAMOR registers

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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>
This commit is contained in:
Ram Pai 2018-01-18 17:50:26 -08:00 committed by Michael Ellerman
parent 4fb158f65a
commit 1b4037dead
1 changed files with 36 additions and 0 deletions
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36
arch/powerpc/mm/pkeys.c
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@ -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);
}