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[50.39.103.96]) by smtp.gmail.com with ESMTPSA id r26sm8001094qki.42.2017.11.06.00.58.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Nov 2017 00:58:33 -0800 (PST) From: Ram Pai To: mpe@ellerman.id.au, mingo@redhat.com, akpm@linux-foundation.org, corbet@lwn.net, arnd@arndb.de Subject: [PATCH v9 05/51] powerpc: helper function to read, write AMR, IAMR, UAMOR registers Date: Mon, 6 Nov 2017 00:56:57 -0800 Message-Id: <1509958663-18737-6-git-send-email-linuxram@us.ibm.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> References: <1509958663-18737-1-git-send-email-linuxram@us.ibm.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, ebiederm@xmission.com, linux-doc@vger.kernel.org, x86@kernel.org, dave.hansen@intel.com, linux-kernel@vger.kernel.org, linuxram@us.ibm.com, mhocko@kernel.org, linux-mm@kvack.org, paulus@samba.org, aneesh.kumar@linux.vnet.ibm.com, linux-kselftest@vger.kernel.org, bauerman@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org, khandual@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 Reviewed-by: Thiago Jung Bauermann Signed-off-by: Ram Pai --- arch/powerpc/mm/pkeys.c | 36 ++++++++++++++++++++++++++++++++++++ 1 files changed, 36 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c index 512bdf2..b6bdfdf 100644 --- a/arch/powerpc/mm/pkeys.c +++ b/arch/powerpc/mm/pkeys.c @@ -61,3 +61,39 @@ void __init pkey_initialize(void) for (i = 2; i < (pkeys_total - os_reserved); i++) initial_allocation_mask &= ~(0x1 << i); } + +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); +}