Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753152AbdGEVbH (ORCPT ); Wed, 5 Jul 2017 17:31:07 -0400 Received: from mail-qk0-f196.google.com ([209.85.220.196]:33162 "EHLO mail-qk0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752769AbdGEVXG (ORCPT ); Wed, 5 Jul 2017 17:23:06 -0400 From: Ram Pai To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, linuxram@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org, corbet@lwn.net, mingo@redhat.com Subject: [RFC v5 15/38] powerpc: helper function to read,write AMR,IAMR,UAMOR registers Date: Wed, 5 Jul 2017 14:21:52 -0700 Message-Id: <1499289735-14220-16-git-send-email-linuxram@us.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1499289735-14220-1-git-send-email-linuxram@us.ibm.com> References: <1499289735-14220-1-git-send-email-linuxram@us.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2312 Lines: 85 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 --- arch/powerpc/include/asm/book3s/64/pgtable.h | 60 ++++++++++++++++++++++++++ 1 files changed, 60 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 85bc987..435d6a7 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -428,6 +428,66 @@ static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, pte_update(mm, addr, ptep, 0, _PAGE_PRIVILEGED, 1); } +#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS + +#include +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); +} + +#else /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ + +static inline u64 read_amr(void) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); + return -1; +} +static inline void write_amr(u64 value) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); +} +static inline u64 read_uamor(void) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); + return -1; +} +static inline void write_uamor(u64 value) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); +} +static inline u64 read_iamr(void) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); + return -1; +} +static inline void write_iamr(u64 value) +{ + WARN(1, "%s called with MEMORY PROTECTION KEYS disabled\n", __func__); +} + +#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */ + #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) -- 1.7.1