patch-2.4.2 linux/arch/arm/lib/io-readsl-armv3.S
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- Lines: 77
- Date:
Thu Feb 8 16:32:44 2001
- Orig file:
v2.4.1/linux/arch/arm/lib/io-readsl-armv3.S
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.1/linux/arch/arm/lib/io-readsl-armv3.S linux/arch/arm/lib/io-readsl-armv3.S
@@ -0,0 +1,76 @@
+/*
+ * linux/arch/arm/lib/io-readsl-armv3.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>
+#include <asm/hardware.h>
+
+/*
+ * Note that some reads can be aligned on half-word boundaries.
+ */
+ENTRY(__arch_readsl)
+ ands ip, r1, #3
+ bne 2f
+
+1: ldr r3, [r0]
+ str r3, [r1], #4
+ subs r2, r2, #1
+ bne 1b
+ mov pc, lr
+
+2: cmp ip, #2
+ ldr ip, [r0]
+ blt 4f
+ bgt 6f
+
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+3: subs r2, r2, #1
+ ldrne r3, [r0]
+ orrne ip, ip, r3, lsl #16
+ strne ip, [r1], #4
+ movne ip, r3, lsr #16
+ bne 3b
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov pc, lr
+
+4: strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+5: subs r2, r2, #1
+ ldrne r3, [r0]
+ orrne ip, ip, r3, lsl #8
+ strne ip, [r1], #4
+ movne ip, r3, lsr #24
+ bne 5b
+ strb ip, [r1], #1
+ mov pc, lr
+
+6: strb ip, [r1], #1
+ mov ip, ip, lsr #8
+7: subs r2, r2, #1
+ ldrne r3, [r0]
+ orrne ip, ip, r3, lsl #24
+ strne ip, [r1], #4
+ movne ip, r3, lsr #8
+ bne 7b
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov ip, ip, lsr #8
+ strb ip, [r1], #1
+ mov pc, lr
+
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