Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 79 insertions, 0 deletions

diff --git a/arch/arm/mm/copypage-v4wb.S b/arch/arm/mm/copypage-v4wb.S
new file mode 100644
index 0000000..b94c345
--- /dev/null
+++ b/arch/arm/mm/copypage-v4wb.S
@@ -0,0 +1,79 @@
+/*
+ *  linux/arch/arm/lib/copypage.S
+ *
+ *  Copyright (C) 1995-1999 Russell King
+ *
+ * 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.
+ *
+ *  ASM optimised string functions
+ */
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/constants.h>
+
+	.text
+	.align	5
+/*
+ * ARMv4 optimised copy_user_page
+ *
+ * We flush the destination cache lines just before we write the data into the
+ * corresponding address.  Since the Dcache is read-allocate, this removes the
+ * Dcache aliasing issue.  The writes will be forwarded to the write buffer,
+ * and merged as appropriate.
+ *
+ * Note: We rely on all ARMv4 processors implementing the "invalidate D line"
+ * instruction.  If your processor does not supply this, you have to write your
+ * own copy_user_page that does the right thing.
+ */
+ENTRY(v4wb_copy_user_page)
+	stmfd	sp!, {r4, lr}			@ 2
+	mov	r2, #PAGE_SZ/64			@ 1
+	ldmia	r1!, {r3, r4, ip, lr}		@ 4
+1:	mcr	p15, 0, r0, c7, c6, 1		@ 1   invalidate D line
+	stmia	r0!, {r3, r4, ip, lr}		@ 4
+	ldmia	r1!, {r3, r4, ip, lr}		@ 4+1
+	stmia	r0!, {r3, r4, ip, lr}		@ 4
+	ldmia	r1!, {r3, r4, ip, lr}		@ 4
+	mcr	p15, 0, r0, c7, c6, 1		@ 1   invalidate D line
+	stmia	r0!, {r3, r4, ip, lr}		@ 4
+	ldmia	r1!, {r3, r4, ip, lr}		@ 4
+	subs	r2, r2, #1			@ 1
+	stmia	r0!, {r3, r4, ip, lr}		@ 4
+	ldmneia	r1!, {r3, r4, ip, lr}		@ 4
+	bne	1b				@ 1
+	mcr	p15, 0, r1, c7, c10, 4		@ 1   drain WB
+	ldmfd	 sp!, {r4, pc}			@ 3
+
+	.align	5
+/*
+ * ARMv4 optimised clear_user_page
+ *
+ * Same story as above.
+ */
+ENTRY(v4wb_clear_user_page)
+	str	lr, [sp, #-4]!
+	mov	r1, #PAGE_SZ/64			@ 1
+	mov	r2, #0				@ 1
+	mov	r3, #0				@ 1
+	mov	ip, #0				@ 1
+	mov	lr, #0				@ 1
+1:	mcr	p15, 0, r0, c7, c6, 1		@ 1   invalidate D line
+	stmia	r0!, {r2, r3, ip, lr}		@ 4
+	stmia	r0!, {r2, r3, ip, lr}		@ 4
+	mcr	p15, 0, r0, c7, c6, 1		@ 1   invalidate D line
+	stmia	r0!, {r2, r3, ip, lr}		@ 4
+	stmia	r0!, {r2, r3, ip, lr}		@ 4
+	subs	r1, r1, #1			@ 1
+	bne	1b				@ 1
+	mcr	p15, 0, r1, c7, c10, 4		@ 1   drain WB
+	ldr	pc, [sp], #4
+
+	__INITDATA
+
+	.type	v4wb_user_fns, #object
+ENTRY(v4wb_user_fns)
+	.long	v4wb_clear_user_page
+	.long	v4wb_copy_user_page
+	.size	v4wb_user_fns, . - v4wb_user_fns