linux-kernel - [PATCH v9 05/51] powerpc: helper function to read,write AMR,IAMR,UAMOR registers

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Date:   Mon,  6 Nov 2017 00:56:57 -0800
From:   Ram Pai <linuxram@...ibm.com>
To:     mpe@...erman.id.au, mingo@...hat.com, akpm@...ux-foundation.org,
        corbet@....net, arnd@...db.de
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        dave.hansen@...el.com, benh@...nel.crashing.org, paulus@...ba.org,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, hbabu@...ibm.com, mhocko@...nel.org,
        bauerman@...ux.vnet.ibm.com, ebiederm@...ssion.com,
        linuxram@...ibm.com
Subject: [PATCH v9 05/51] powerpc: helper function to read,write AMR,IAMR,UAMOR registers

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@...il.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@...ibm.com>
---
 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);
+}
-- 
1.7.1