[Xen-changelog] [xen master] xen: arm64: optimised clear_page

[patchbot@xxxxxxx]

commit 856468788a62a37060d9b9d67c24de8fd1a4c24d
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Wed Mar 19 17:19:56 2014 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Apr 3 17:15:44 2014 +0100

    xen: arm64: optimised clear_page
    
    Taken from Linux v3.14-rc7.
    
    The clear_page header now needs to be within the !__ASSEMBLY__
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    
    Acked-by: Tim Deegan <tim@xxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
---
 xen/arch/arm/arm64/lib/Makefile     |    1 +
 xen/arch/arm/arm64/lib/clear_page.S |   36 +++++++++++++++++++++++++++++++++++
 xen/include/asm-arm/arm32/page.h    |    2 +
 xen/include/asm-arm/arm64/page.h    |    2 +
 xen/include/asm-arm/page.h          |    2 -
 5 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm64/lib/Makefile b/xen/arch/arm/arm64/lib/Makefile
index 9f3b236..b895afa 100644
--- a/xen/arch/arm/arm64/lib/Makefile
+++ b/xen/arch/arm/arm64/lib/Makefile
@@ -1,3 +1,4 @@
 obj-y += memcpy.o memmove.o memset.o memchr.o
+obj-y += clear_page.o
 obj-y += bitops.o find_next_bit.o
 obj-y += strchr.o strrchr.o
diff --git a/xen/arch/arm/arm64/lib/clear_page.S 
b/xen/arch/arm/arm64/lib/clear_page.S
new file mode 100644
index 0000000..8d5cadb
--- /dev/null
+++ b/xen/arch/arm/arm64/lib/clear_page.S
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/config.h>
+
+/*
+ * Clear page @dest
+ *
+ * Parameters:
+ *     x0 - dest
+ */
+ENTRY(clear_page)
+       mrs     x1, dczid_el0
+       and     w1, w1, #0xf
+       mov     x2, #4
+       lsl     x1, x2, x1
+
+1:     dc      zva, x0
+       add     x0, x0, x1
+       tst     x0, #(PAGE_SIZE - 1)
+       b.ne    1b
+       ret
+ENDPROC(clear_page)
diff --git a/xen/include/asm-arm/arm32/page.h b/xen/include/asm-arm/arm32/page.h
index 3f2bdc9..4abb281 100644
--- a/xen/include/asm-arm/arm32/page.h
+++ b/xen/include/asm-arm/arm32/page.h
@@ -108,6 +108,8 @@ static inline uint64_t gva_to_ipa_par(vaddr_t va)
     return par;
 }
 
+#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ARM_ARM32_PAGE_H__ */
diff --git a/xen/include/asm-arm/arm64/page.h b/xen/include/asm-arm/arm64/page.h
index d7ee2fc..713baf6 100644
--- a/xen/include/asm-arm/arm64/page.h
+++ b/xen/include/asm-arm/arm64/page.h
@@ -103,6 +103,8 @@ static inline uint64_t gva_to_ipa_par(vaddr_t va)
     return par;
 }
 
+extern void clear_page(void *to);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ARM_ARM64_PAGE_H__ */
diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index 877aa2a..0c0fd37 100644
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -420,8 +420,6 @@ static inline int gva_to_ipa(vaddr_t va, paddr_t *paddr)
 #define third_table_offset(va)  TABLE_OFFSET(third_linear_offset(va))
 #define zeroeth_table_offset(va)  TABLE_OFFSET(zeroeth_linear_offset(va))
 
-#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
-
 #define PAGE_ALIGN(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK)
 
 #endif /* __ARM_PAGE_H__ */
--
generated by git-patchbot for /home/xen/git/xen.git#master

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