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-rw-r--r--arch/arm/lib/io-writesl.S66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm/lib/io-writesl.S b/arch/arm/lib/io-writesl.S
new file mode 100644
index 000000000000..f8f14dd227ca
--- /dev/null
+++ b/arch/arm/lib/io-writesl.S
@@ -0,0 +1,66 @@
+/*
+ * linux/arch/arm/lib/io-writesl.S
+ *
+ * Copyright (C) 1995-2000 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.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ENTRY(__raw_writesl)
+ teq r2, #0 @ do we have to check for the zero len?
+ moveq pc, lr
+ ands ip, r1, #3
+ bne 3f
+
+ subs r2, r2, #4
+ bmi 2f
+ stmfd sp!, {r4, lr}
+1: ldmia r1!, {r3, r4, ip, lr}
+ subs r2, r2, #4
+ str r3, [r0, #0]
+ str r4, [r0, #0]
+ str ip, [r0, #0]
+ str lr, [r0, #0]
+ bpl 1b
+ ldmfd sp!, {r4, lr}
+2: movs r2, r2, lsl #31
+ ldmcsia r1!, {r3, ip}
+ strcs r3, [r0, #0]
+ ldrne r3, [r1, #0]
+ strcs ip, [r0, #0]
+ strne r3, [r0, #0]
+ mov pc, lr
+
+3: bic r1, r1, #3
+ ldr r3, [r1], #4
+ cmp ip, #2
+ blt 5f
+ bgt 6f
+
+4: mov ip, r3, pull #16
+ ldr r3, [r1], #4
+ subs r2, r2, #1
+ orr ip, ip, r3, push #16
+ str ip, [r0]
+ bne 4b
+ mov pc, lr
+
+5: mov ip, r3, pull #8
+ ldr r3, [r1], #4
+ subs r2, r2, #1
+ orr ip, ip, r3, push #24
+ str ip, [r0]
+ bne 5b
+ mov pc, lr
+
+6: mov ip, r3, pull #24
+ ldr r3, [r1], #4
+ subs r2, r2, #1
+ orr ip, ip, r3, push #8
+ str ip, [r0]
+ bne 6b
+ mov pc, lr