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authorBen Dooks <ben-linux@fluff.org>2008-07-15 20:19:14 +0100
committerBen Dooks <ben-linux@fluff.org>2008-07-15 20:19:14 +0100
commit0c17e4ceedd35c78b1c7413dbd16279a350be6bc (patch)
tree313b3b9ca04727f3704464e01d8dd97da1dd534b /arch/arm/lib
parent19c1d6a34abf73d0baf8e325d018c920fa78dddc (diff)
parentb9d2252c1e44fa83a4e65fdc9eb93db6297c55af (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-rmk
Diffstat (limited to 'arch/arm/lib')
-rw-r--r--arch/arm/lib/copy_template.S12
-rw-r--r--arch/arm/lib/memmove.S14
-rw-r--r--arch/arm/lib/memset.S46
-rw-r--r--arch/arm/lib/memzero.S44
4 files changed, 95 insertions, 21 deletions
diff --git a/arch/arm/lib/copy_template.S b/arch/arm/lib/copy_template.S
index cab355c0c1f..139cce64605 100644
--- a/arch/arm/lib/copy_template.S
+++ b/arch/arm/lib/copy_template.S
@@ -13,14 +13,6 @@
*/
/*
- * This can be used to enable code to cacheline align the source pointer.
- * Experiments on tested architectures (StrongARM and XScale) didn't show
- * this a worthwhile thing to do. That might be different in the future.
- */
-//#define CALGN(code...) code
-#define CALGN(code...)
-
-/*
* Theory of operation
* -------------------
*
@@ -82,7 +74,7 @@
stmfd sp!, {r5 - r8}
blt 5f
- CALGN( ands ip, r1, #31 )
+ CALGN( ands ip, r0, #31 )
CALGN( rsb r3, ip, #32 )
CALGN( sbcnes r4, r3, r2 ) @ C is always set here
CALGN( bcs 2f )
@@ -168,7 +160,7 @@
subs r2, r2, #28
blt 14f
- CALGN( ands ip, r1, #31 )
+ CALGN( ands ip, r0, #31 )
CALGN( rsb ip, ip, #32 )
CALGN( sbcnes r4, ip, r2 ) @ C is always set here
CALGN( subcc r2, r2, ip )
diff --git a/arch/arm/lib/memmove.S b/arch/arm/lib/memmove.S
index ef7fddc14ac..2e301b7bd8f 100644
--- a/arch/arm/lib/memmove.S
+++ b/arch/arm/lib/memmove.S
@@ -13,14 +13,6 @@
#include <linux/linkage.h>
#include <asm/assembler.h>
-/*
- * This can be used to enable code to cacheline align the source pointer.
- * Experiments on tested architectures (StrongARM and XScale) didn't show
- * this a worthwhile thing to do. That might be different in the future.
- */
-//#define CALGN(code...) code
-#define CALGN(code...)
-
.text
/*
@@ -55,11 +47,12 @@ ENTRY(memmove)
stmfd sp!, {r5 - r8}
blt 5f
- CALGN( ands ip, r1, #31 )
+ CALGN( ands ip, r0, #31 )
CALGN( sbcnes r4, ip, r2 ) @ C is always set here
CALGN( bcs 2f )
CALGN( adr r4, 6f )
CALGN( subs r2, r2, ip ) @ C is set here
+ CALGN( rsb ip, ip, #32 )
CALGN( add pc, r4, ip )
PLD( pld [r1, #-4] )
@@ -138,8 +131,7 @@ ENTRY(memmove)
subs r2, r2, #28
blt 14f
- CALGN( ands ip, r1, #31 )
- CALGN( rsb ip, ip, #32 )
+ CALGN( ands ip, r0, #31 )
CALGN( sbcnes r4, ip, r2 ) @ C is always set here
CALGN( subcc r2, r2, ip )
CALGN( bcc 15f )
diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S
index 95b110b07a8..b477d4ac88e 100644
--- a/arch/arm/lib/memset.S
+++ b/arch/arm/lib/memset.S
@@ -39,6 +39,9 @@ ENTRY(memset)
mov r3, r1
cmp r2, #16
blt 4f
+
+#if ! CALGN(1)+0
+
/*
* We need an extra register for this loop - save the return address and
* use the LR
@@ -64,6 +67,49 @@ ENTRY(memset)
stmneia r0!, {r1, r3, ip, lr}
ldr lr, [sp], #4
+#else
+
+/*
+ * This version aligns the destination pointer in order to write
+ * whole cache lines at once.
+ */
+
+ stmfd sp!, {r4-r7, lr}
+ mov r4, r1
+ mov r5, r1
+ mov r6, r1
+ mov r7, r1
+ mov ip, r1
+ mov lr, r1
+
+ cmp r2, #96
+ tstgt r0, #31
+ ble 3f
+
+ and ip, r0, #31
+ rsb ip, ip, #32
+ sub r2, r2, ip
+ movs ip, ip, lsl #(32 - 4)
+ stmcsia r0!, {r4, r5, r6, r7}
+ stmmiia r0!, {r4, r5}
+ tst ip, #(1 << 30)
+ mov ip, r1
+ strne r1, [r0], #4
+
+3: subs r2, r2, #64
+ stmgeia r0!, {r1, r3-r7, ip, lr}
+ stmgeia r0!, {r1, r3-r7, ip, lr}
+ bgt 3b
+ ldmeqfd sp!, {r4-r7, pc}
+
+ tst r2, #32
+ stmneia r0!, {r1, r3-r7, ip, lr}
+ tst r2, #16
+ stmneia r0!, {r4-r7}
+ ldmfd sp!, {r4-r7, lr}
+
+#endif
+
4: tst r2, #8
stmneia r0!, {r1, r3}
tst r2, #4
diff --git a/arch/arm/lib/memzero.S b/arch/arm/lib/memzero.S
index abf2508e822..b8f79d80ee9 100644
--- a/arch/arm/lib/memzero.S
+++ b/arch/arm/lib/memzero.S
@@ -39,6 +39,9 @@ ENTRY(__memzero)
*/
cmp r1, #16 @ 1 we can skip this chunk if we
blt 4f @ 1 have < 16 bytes
+
+#if ! CALGN(1)+0
+
/*
* We need an extra register for this loop - save the return address and
* use the LR
@@ -64,6 +67,47 @@ ENTRY(__memzero)
stmneia r0!, {r2, r3, ip, lr} @ 4
ldr lr, [sp], #4 @ 1
+#else
+
+/*
+ * This version aligns the destination pointer in order to write
+ * whole cache lines at once.
+ */
+
+ stmfd sp!, {r4-r7, lr}
+ mov r4, r2
+ mov r5, r2
+ mov r6, r2
+ mov r7, r2
+ mov ip, r2
+ mov lr, r2
+
+ cmp r1, #96
+ andgts ip, r0, #31
+ ble 3f
+
+ rsb ip, ip, #32
+ sub r1, r1, ip
+ movs ip, ip, lsl #(32 - 4)
+ stmcsia r0!, {r4, r5, r6, r7}
+ stmmiia r0!, {r4, r5}
+ movs ip, ip, lsl #2
+ strcs r2, [r0], #4
+
+3: subs r1, r1, #64
+ stmgeia r0!, {r2-r7, ip, lr}
+ stmgeia r0!, {r2-r7, ip, lr}
+ bgt 3b
+ ldmeqfd sp!, {r4-r7, pc}
+
+ tst r1, #32
+ stmneia r0!, {r2-r7, ip, lr}
+ tst r1, #16
+ stmneia r0!, {r4-r7}
+ ldmfd sp!, {r4-r7, lr}
+
+#endif
+
4: tst r1, #8 @ 1 8 bytes or more?
stmneia r0!, {r2, r3} @ 2
tst r1, #4 @ 1 4 bytes or more?