powerpc: helper function to read, write AMR, IAMR, UAMOR registers (1b4037de) · Commits · e / devices / android_kernel_oneplus_sm7250

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>

arch/powerpc/mm/pkeys.c

+36 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}