[PATCH 04/25] powerpc: helper function to read, write AMR, IAMR, UAMOR registers
From: Ram Pai <hidden>
Date: 2017-09-08 22:46:49
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
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 Signed-off-by: Ram Pai <redacted> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 31 ++++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index b9aff51..73ed52c 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h@@ -438,6 +438,37 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1); } +#include <asm/reg.h> +static inline u64 read_amr(void) +{ + return mfspr(SPRN_AMR); +} +static inline void write_amr(u64 value) +{ + mtspr(SPRN_AMR, value); +} +extern bool pkey_execute_disable_support; +static inline u64 read_iamr(void) +{ + if (pkey_execute_disable_support) + return mfspr(SPRN_IAMR); + else + return 0x0UL; +} +static inline void write_iamr(u64 value) +{ + if (pkey_execute_disable_support) + 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); +} + #define __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
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1.7.1