1 files changed, 130 insertions, 0 deletions
diff --git a/arch/arm/lib/io-readsw-armv4.S b/arch/arm/lib/io-readsw-armv4.S
new file mode 100644
index 000000000000..c92b66ecbe86
--- /dev/null
+++ b/arch/arm/lib/io-readsw-armv4.S
@@ -0,0 +1,130 @@
+/*
+ *  linux/arch/arm/lib/io-readsw-armv4.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>
+
+		.macro	pack, rd, hw1, hw2
+#ifndef __ARMEB__
+		orr	\rd, \hw1, \hw2, lsl #16
+#else
+		orr	\rd, \hw2, \hw1, lsl #16
+#endif
+		.endm
+
+.insw_align:	movs	ip, r1, lsl #31
+		bne	.insw_noalign
+		ldrh	ip, [r0]
+		sub	r2, r2, #1
+		strh	ip, [r1], #2
+
+ENTRY(__raw_readsw)
+		teq	r2, #0
+		moveq	pc, lr
+		tst	r1, #3
+		bne	.insw_align
+
+		stmfd	sp!, {r4, r5, lr}
+
+		subs	r2, r2, #8
+		bmi	.no_insw_8
+
+.insw_8_lp:	ldrh	r3, [r0]
+		ldrh	r4, [r0]
+		pack	r3, r3, r4
+
+		ldrh	r4, [r0]
+		ldrh	r5, [r0]
+		pack	r4, r4, r5
+
+		ldrh	r5, [r0]
+		ldrh	ip, [r0]
+		pack	r5, r5, ip
+
+		ldrh	ip, [r0]
+		ldrh	lr, [r0]
+		pack	ip, ip, lr
+
+		subs	r2, r2, #8
+		stmia	r1!, {r3 - r5, ip}
+		bpl	.insw_8_lp
+
+.no_insw_8:	tst	r2, #4
+		beq	.no_insw_4
+
+		ldrh	r3, [r0]
+		ldrh	r4, [r0]
+		pack	r3, r3, r4
+
+		ldrh	r4, [r0]
+		ldrh	ip, [r0]
+		pack	r4, r4, ip
+
+		stmia	r1!, {r3, r4}
+
+.no_insw_4:	movs	r2, r2, lsl #31
+		bcc	.no_insw_2
+
+		ldrh	r3, [r0]
+		ldrh	ip, [r0]
+		pack	r3, r3, ip
+		str	r3, [r1], #4
+
+.no_insw_2:	ldrneh	r3, [r0]
+		strneh	r3, [r1]
+
+		ldmfd	sp!, {r4, r5, pc}
+
+#ifdef __ARMEB__
+#define _BE_ONLY_(code...)	code
+#define _LE_ONLY_(code...)
+#define push_hbyte0		lsr #8
+#define pull_hbyte1		lsl #24
+#else
+#define _BE_ONLY_(code...)
+#define _LE_ONLY_(code...) code
+#define push_hbyte0		lsl #24
+#define pull_hbyte1		lsr #8
+#endif
+
+.insw_noalign:	stmfd	sp!, {r4, lr}
+		ldrccb	ip, [r1, #-1]!
+		bcc	1f
+
+		ldrh	ip, [r0]
+		sub	r2, r2, #1
+   _BE_ONLY_(	mov	ip, ip, ror #8		)
+		strb	ip, [r1], #1
+   _LE_ONLY_(	mov	ip, ip, lsr #8		)
+   _BE_ONLY_(	mov	ip, ip, lsr #24		)
+
+1:		subs	r2, r2, #2
+		bmi	3f
+   _BE_ONLY_(	mov	ip, ip, lsl #24		)
+
+2:		ldrh	r3, [r0]
+		ldrh	r4, [r0]
+		subs	r2, r2, #2
+		orr	ip, ip, r3, lsl #8
+		orr	ip, ip, r4, push_hbyte0
+		str	ip, [r1], #4
+		mov	ip, r4, pull_hbyte1
+		bpl	2b
+
+   _BE_ONLY_(	mov	ip, ip, lsr #24		)
+
+3:		tst	r2, #1
+		strb	ip, [r1], #1
+		ldrneh	ip, [r0]
+   _BE_ONLY_(	movne	ip, ip, ror #8		)
+		strneb	ip, [r1], #1
+   _LE_ONLY_(	movne	ip, ip, lsr #8		)
+   _BE_ONLY_(	movne	ip, ip, lsr #24		)
+		strneb	ip, [r1]
+		ldmfd	sp!, {r4, pc}