[RFC,v6,14/62] powerpc: helper function to read, write AMR, IAMR, UAMOR registers

Submitted by Ram Pai on July 16, 2017, 3:56 a.m.

Details

Message ID 1500177424-13695-15-git-send-email-linuxram@us.ibm.com
State RFC
Headers show

Commit Message

Ram Pai July 16, 2017, 3:56 a.m.
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 <linuxram@us.ibm.com>
---
 arch/powerpc/include/asm/book3s/64/pgtable.h |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

Patch hide | download patch | download mbox

diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 85bc987..d4da0e9 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -428,6 +428,32 @@  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);
+}
+static inline u64 read_iamr(void)
+{
+	return mfspr(SPRN_IAMR);
+}
+static inline void write_iamr(u64 value)
+{
+	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)