aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mm/copypage-xsc3.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mm/copypage-xsc3.S')
-rw-r--r--arch/arm/mm/copypage-xsc3.S97
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/arm/mm/copypage-xsc3.S b/arch/arm/mm/copypage-xsc3.S
new file mode 100644
index 00000000000..9a2cb4332b4
--- /dev/null
+++ b/arch/arm/mm/copypage-xsc3.S
@@ -0,0 +1,97 @@
+/*
+ * linux/arch/arm/lib/copypage-xsc3.S
+ *
+ * Copyright (C) 2004 Intel Corp.
+ *
+ * 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.
+ *
+ * Adapted for 3rd gen XScale core, no more mini-dcache
+ * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * General note:
+ * We don't really want write-allocate cache behaviour for these functions
+ * since that will just eat through 8K of the cache.
+ */
+
+ .text
+ .align 5
+/*
+ * XSC3 optimised copy_user_page
+ * r0 = destination
+ * r1 = source
+ * r2 = virtual user address of ultimate destination page
+ *
+ * The source page may have some clean entries in the cache already, but we
+ * can safely ignore them - break_cow() will flush them out of the cache
+ * if we eventually end up using our copied page.
+ *
+ */
+ENTRY(xsc3_mc_copy_user_page)
+ stmfd sp!, {r4, r5, lr}
+ mov lr, #PAGE_SZ/64-1
+
+ pld [r1, #0]
+ pld [r1, #32]
+1: pld [r1, #64]
+ pld [r1, #96]
+
+2: ldrd r2, [r1], #8
+ mov ip, r0
+ ldrd r4, [r1], #8
+ mcr p15, 0, ip, c7, c6, 1 @ invalidate
+ strd r2, [r0], #8
+ ldrd r2, [r1], #8
+ strd r4, [r0], #8
+ ldrd r4, [r1], #8
+ strd r2, [r0], #8
+ strd r4, [r0], #8
+ ldrd r2, [r1], #8
+ mov ip, r0
+ ldrd r4, [r1], #8
+ mcr p15, 0, ip, c7, c6, 1 @ invalidate
+ strd r2, [r0], #8
+ ldrd r2, [r1], #8
+ subs lr, lr, #1
+ strd r4, [r0], #8
+ ldrd r4, [r1], #8
+ strd r2, [r0], #8
+ strd r4, [r0], #8
+ bgt 1b
+ beq 2b
+
+ ldmfd sp!, {r4, r5, pc}
+
+ .align 5
+/*
+ * XScale optimised clear_user_page
+ * r0 = destination
+ * r1 = virtual user address of ultimate destination page
+ */
+ENTRY(xsc3_mc_clear_user_page)
+ mov r1, #PAGE_SZ/32
+ mov r2, #0
+ mov r3, #0
+1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line
+ strd r2, [r0], #8
+ strd r2, [r0], #8
+ strd r2, [r0], #8
+ strd r2, [r0], #8
+ subs r1, r1, #1
+ bne 1b
+ mov pc, lr
+
+ __INITDATA
+
+ .type xsc3_mc_user_fns, #object
+ENTRY(xsc3_mc_user_fns)
+ .long xsc3_mc_clear_user_page
+ .long xsc3_mc_copy_user_page
+ .size xsc3_mc_user_fns, . - xsc3_mc_user_fns