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authorMatthew Wilcox <mawilcox@microsoft.com>2017-09-08 16:14:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:48 -0700
commitfd1d362600e2d2edb6262d8e05661424c1a315bf (patch)
treea7386f39d0c7ba19711542ad74c55681842add70 /arch
parent4c51248533adcfb01ba704ce5993ecbad5cc4c99 (diff)
ARM: implement memset32 & memset64
Reuse the existing optimised memset implementation to implement an optimised memset32 and memset64. Link: http://lkml.kernel.org/r/20170720184539.31609-5-willy@infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: David Miller <davem@davemloft.net> Cc: Ingo Molnar <mingo@elte.hu> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Minchan Kim <minchan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/include/asm/string.h14
-rw-r--r--arch/arm/kernel/armksyms.c2
-rw-r--r--arch/arm/lib/memset.S24
3 files changed, 34 insertions, 6 deletions
diff --git a/arch/arm/include/asm/string.h b/arch/arm/include/asm/string.h
index cf4f3aad0fc1..fe1c6af3a1b1 100644
--- a/arch/arm/include/asm/string.h
+++ b/arch/arm/include/asm/string.h
@@ -24,6 +24,20 @@ extern void * memchr(const void *, int, __kernel_size_t);
#define __HAVE_ARCH_MEMSET
extern void * memset(void *, int, __kernel_size_t);
+#define __HAVE_ARCH_MEMSET32
+extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
+static inline void *memset32(uint32_t *p, uint32_t v, __kernel_size_t n)
+{
+ return __memset32(p, v, n * 4);
+}
+
+#define __HAVE_ARCH_MEMSET64
+extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
+static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
+{
+ return __memset64(p, v, n * 8, v >> 32);
+}
+
extern void __memzero(void *ptr, __kernel_size_t n);
#define memset(p,v,n) \
diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index 8e8d20cdbce7..5266fd9ad6b4 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -87,6 +87,8 @@ EXPORT_SYMBOL(__raw_writesl);
EXPORT_SYMBOL(strchr);
EXPORT_SYMBOL(strrchr);
EXPORT_SYMBOL(memset);
+EXPORT_SYMBOL(__memset32);
+EXPORT_SYMBOL(__memset64);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(memchr);
diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S
index 3c65e3bd790f..ed6d35d9cdb5 100644
--- a/arch/arm/lib/memset.S
+++ b/arch/arm/lib/memset.S
@@ -28,7 +28,7 @@ UNWIND( .fnstart )
1: orr r1, r1, r1, lsl #8
orr r1, r1, r1, lsl #16
mov r3, r1
- cmp r2, #16
+7: cmp r2, #16
blt 4f
#if ! CALGN(1)+0
@@ -41,7 +41,7 @@ UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r8, lr} )
mov r8, r1
- mov lr, r1
+ mov lr, r3
2: subs r2, r2, #64
stmgeia ip!, {r1, r3, r8, lr} @ 64 bytes at a time.
@@ -73,11 +73,11 @@ UNWIND( .fnend )
UNWIND( .fnstart )
UNWIND( .save {r4-r8, lr} )
mov r4, r1
- mov r5, r1
+ mov r5, r3
mov r6, r1
- mov r7, r1
+ mov r7, r3
mov r8, r1
- mov lr, r1
+ mov lr, r3
cmp r2, #96
tstgt ip, #31
@@ -114,7 +114,7 @@ UNWIND( .fnstart )
tst r2, #4
strne r1, [ip], #4
/*
- * When we get here, we've got less than 4 bytes to zero. We
+ * When we get here, we've got less than 4 bytes to set. We
* may have an unaligned pointer as well.
*/
5: tst r2, #2
@@ -135,3 +135,15 @@ UNWIND( .fnstart )
UNWIND( .fnend )
ENDPROC(memset)
ENDPROC(mmioset)
+
+ENTRY(__memset32)
+UNWIND( .fnstart )
+ mov r3, r1 @ copy r1 to r3 and fall into memset64
+UNWIND( .fnend )
+ENDPROC(__memset32)
+ENTRY(__memset64)
+UNWIND( .fnstart )
+ mov ip, r0 @ preserve r0 as return value
+ b 7b @ jump into the middle of memset
+UNWIND( .fnend )
+ENDPROC(__memset64)