1 files changed, 337 insertions, 0 deletions
diff --git a/arch/powerpc/lib/checksum_32.S b/arch/powerpc/lib/checksum_32.S
new file mode 100644
index 000000000..aa224069f
--- /dev/null
+++ b/arch/powerpc/lib/checksum_32.S
@@ -0,0 +1,337 @@
+/*
+ * This file contains assembly-language implementations
+ * of IP-style 1's complement checksum routines.
+ *	
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ * Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au).
+ */
+
+#include <linux/sys.h>
+#include <asm/processor.h>
+#include <asm/cache.h>
+#include <asm/errno.h>
+#include <asm/ppc_asm.h>
+#include <asm/export.h>
+
+	.text
+
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * __csum_partial(buff, len, sum)
+ */
+_GLOBAL(__csum_partial)
+	subi	r3,r3,4
+	srawi.	r6,r4,2		/* Divide len by 4 and also clear carry */
+	beq	3f		/* if we're doing < 4 bytes */
+	andi.	r0,r3,2		/* Align buffer to longword boundary */
+	beq+	1f
+	lhz	r0,4(r3)	/* do 2 bytes to get aligned */
+	subi	r4,r4,2
+	addi	r3,r3,2
+	srwi.	r6,r4,2		/* # words to do */
+	adde	r5,r5,r0
+	beq	3f
+1:	andi.	r6,r6,3		/* Prepare to handle words 4 by 4 */
+	beq	21f
+	mtctr	r6
+2:	lwzu	r0,4(r3)
+	adde	r5,r5,r0
+	bdnz	2b
+21:	srwi.	r6,r4,4		/* # blocks of 4 words to do */
+	beq	3f
+	lwz	r0,4(r3)
+	mtctr	r6
+	lwz	r6,8(r3)
+	adde	r5,r5,r0
+	lwz	r7,12(r3)
+	adde	r5,r5,r6
+	lwzu	r8,16(r3)
+	adde	r5,r5,r7
+	bdz	23f
+22:	lwz	r0,4(r3)
+	adde	r5,r5,r8
+	lwz	r6,8(r3)
+	adde	r5,r5,r0
+	lwz	r7,12(r3)
+	adde	r5,r5,r6
+	lwzu	r8,16(r3)
+	adde	r5,r5,r7
+	bdnz	22b
+23:	adde	r5,r5,r8
+3:	andi.	r0,r4,2
+	beq+	4f
+	lhz	r0,4(r3)
+	addi	r3,r3,2
+	adde	r5,r5,r0
+4:	andi.	r0,r4,1
+	beq+	5f
+	lbz	r0,4(r3)
+	slwi	r0,r0,8		/* Upper byte of word */
+	adde	r5,r5,r0
+5:	addze	r3,r5		/* add in final carry */
+	blr
+EXPORT_SYMBOL(__csum_partial)
+
+/*
+ * Computes the checksum of a memory block at src, length len,
+ * and adds in "sum" (32-bit), while copying the block to dst.
+ * If an access exception occurs on src or dst, it stores -EFAULT
+ * to *src_err or *dst_err respectively, and (for an error on
+ * src) zeroes the rest of dst.
+ *
+ * csum_partial_copy_generic(src, dst, len, sum, src_err, dst_err)
+ */
+#define CSUM_COPY_16_BYTES_WITHEX(n)	\
+8 ## n ## 0:			\
+	lwz	r7,4(r4);	\
+8 ## n ## 1:			\
+	lwz	r8,8(r4);	\
+8 ## n ## 2:			\
+	lwz	r9,12(r4);	\
+8 ## n ## 3:			\
+	lwzu	r10,16(r4);	\
+8 ## n ## 4:			\
+	stw	r7,4(r6);	\
+	adde	r12,r12,r7;	\
+8 ## n ## 5:			\
+	stw	r8,8(r6);	\
+	adde	r12,r12,r8;	\
+8 ## n ## 6:			\
+	stw	r9,12(r6);	\
+	adde	r12,r12,r9;	\
+8 ## n ## 7:			\
+	stwu	r10,16(r6);	\
+	adde	r12,r12,r10
+
+#define CSUM_COPY_16_BYTES_EXCODE(n)		\
+	EX_TABLE(8 ## n ## 0b, src_error);	\
+	EX_TABLE(8 ## n ## 1b, src_error);	\
+	EX_TABLE(8 ## n ## 2b, src_error);	\
+	EX_TABLE(8 ## n ## 3b, src_error);	\
+	EX_TABLE(8 ## n ## 4b, dst_error);	\
+	EX_TABLE(8 ## n ## 5b, dst_error);	\
+	EX_TABLE(8 ## n ## 6b, dst_error);	\
+	EX_TABLE(8 ## n ## 7b, dst_error);
+
+	.text
+	.stabs	"arch/powerpc/lib/",N_SO,0,0,0f
+	.stabs	"checksum_32.S",N_SO,0,0,0f
+0:
+
+CACHELINE_BYTES = L1_CACHE_BYTES
+LG_CACHELINE_BYTES = L1_CACHE_SHIFT
+CACHELINE_MASK = (L1_CACHE_BYTES-1)
+
+_GLOBAL(csum_partial_copy_generic)
+	stwu	r1,-16(r1)
+	stw	r7,12(r1)
+	stw	r8,8(r1)
+
+	addic	r12,r6,0
+	addi	r6,r4,-4
+	neg	r0,r4
+	addi	r4,r3,-4
+	andi.	r0,r0,CACHELINE_MASK	/* # bytes to start of cache line */
+	crset	4*cr7+eq
+	beq	58f
+
+	cmplw	0,r5,r0			/* is this more than total to do? */
+	blt	63f			/* if not much to do */
+	rlwinm	r7,r6,3,0x8
+	rlwnm	r12,r12,r7,0,31	/* odd destination address: rotate one byte */
+	cmplwi	cr7,r7,0	/* is destination address even ? */
+	andi.	r8,r0,3			/* get it word-aligned first */
+	mtctr	r8
+	beq+	61f
+	li	r3,0
+70:	lbz	r9,4(r4)		/* do some bytes */
+	addi	r4,r4,1
+	slwi	r3,r3,8
+	rlwimi	r3,r9,0,24,31
+71:	stb	r9,4(r6)
+	addi	r6,r6,1
+	bdnz	70b
+	adde	r12,r12,r3
+61:	subf	r5,r0,r5
+	srwi.	r0,r0,2
+	mtctr	r0
+	beq	58f
+72:	lwzu	r9,4(r4)		/* do some words */
+	adde	r12,r12,r9
+73:	stwu	r9,4(r6)
+	bdnz	72b
+
+58:	srwi.	r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
+	clrlwi	r5,r5,32-LG_CACHELINE_BYTES
+	li	r11,4
+	beq	63f
+
+	/* Here we decide how far ahead to prefetch the source */
+	li	r3,4
+	cmpwi	r0,1
+	li	r7,0
+	ble	114f
+	li	r7,1
+#if MAX_COPY_PREFETCH > 1
+	/* Heuristically, for large transfers we prefetch
+	   MAX_COPY_PREFETCH cachelines ahead.  For small transfers
+	   we prefetch 1 cacheline ahead. */
+	cmpwi	r0,MAX_COPY_PREFETCH
+	ble	112f
+	li	r7,MAX_COPY_PREFETCH
+112:	mtctr	r7
+111:	dcbt	r3,r4
+	addi	r3,r3,CACHELINE_BYTES
+	bdnz	111b
+#else
+	dcbt	r3,r4
+	addi	r3,r3,CACHELINE_BYTES
+#endif /* MAX_COPY_PREFETCH > 1 */
+
+114:	subf	r8,r7,r0
+	mr	r0,r7
+	mtctr	r8
+
+53:	dcbt	r3,r4
+54:	dcbz	r11,r6
+/* the main body of the cacheline loop */
+	CSUM_COPY_16_BYTES_WITHEX(0)
+#if L1_CACHE_BYTES >= 32
+	CSUM_COPY_16_BYTES_WITHEX(1)
+#if L1_CACHE_BYTES >= 64
+	CSUM_COPY_16_BYTES_WITHEX(2)
+	CSUM_COPY_16_BYTES_WITHEX(3)
+#if L1_CACHE_BYTES >= 128
+	CSUM_COPY_16_BYTES_WITHEX(4)
+	CSUM_COPY_16_BYTES_WITHEX(5)
+	CSUM_COPY_16_BYTES_WITHEX(6)
+	CSUM_COPY_16_BYTES_WITHEX(7)
+#endif
+#endif
+#endif
+	bdnz	53b
+	cmpwi	r0,0
+	li	r3,4
+	li	r7,0
+	bne	114b
+
+63:	srwi.	r0,r5,2
+	mtctr	r0
+	beq	64f
+30:	lwzu	r0,4(r4)
+	adde	r12,r12,r0
+31:	stwu	r0,4(r6)
+	bdnz	30b
+
+64:	andi.	r0,r5,2
+	beq+	65f
+40:	lhz	r0,4(r4)
+	addi	r4,r4,2
+41:	sth	r0,4(r6)
+	adde	r12,r12,r0
+	addi	r6,r6,2
+65:	andi.	r0,r5,1
+	beq+	66f
+50:	lbz	r0,4(r4)
+51:	stb	r0,4(r6)
+	slwi	r0,r0,8
+	adde	r12,r12,r0
+66:	addze	r3,r12
+	addi	r1,r1,16
+	beqlr+	cr7
+	rlwinm	r3,r3,8,0,31	/* odd destination address: rotate one byte */
+	blr
+
+/* read fault */
+src_error:
+	lwz	r7,12(r1)
+	addi	r1,r1,16
+	cmpwi	cr0,r7,0
+	beqlr
+	li	r0,-EFAULT
+	stw	r0,0(r7)
+	blr
+/* write fault */
+dst_error:
+	lwz	r8,8(r1)
+	addi	r1,r1,16
+	cmpwi	cr0,r8,0
+	beqlr
+	li	r0,-EFAULT
+	stw	r0,0(r8)
+	blr
+
+	EX_TABLE(70b, src_error);
+	EX_TABLE(71b, dst_error);
+	EX_TABLE(72b, src_error);
+	EX_TABLE(73b, dst_error);
+	EX_TABLE(54b, dst_error);
+
+/*
+ * this stuff handles faults in the cacheline loop and branches to either
+ * src_error (if in read part) or dst_error (if in write part)
+ */
+	CSUM_COPY_16_BYTES_EXCODE(0)
+#if L1_CACHE_BYTES >= 32
+	CSUM_COPY_16_BYTES_EXCODE(1)
+#if L1_CACHE_BYTES >= 64
+	CSUM_COPY_16_BYTES_EXCODE(2)
+	CSUM_COPY_16_BYTES_EXCODE(3)
+#if L1_CACHE_BYTES >= 128
+	CSUM_COPY_16_BYTES_EXCODE(4)
+	CSUM_COPY_16_BYTES_EXCODE(5)
+	CSUM_COPY_16_BYTES_EXCODE(6)
+	CSUM_COPY_16_BYTES_EXCODE(7)
+#endif
+#endif
+#endif
+
+	EX_TABLE(30b, src_error);
+	EX_TABLE(31b, dst_error);
+	EX_TABLE(40b, src_error);
+	EX_TABLE(41b, dst_error);
+	EX_TABLE(50b, src_error);
+	EX_TABLE(51b, dst_error);
+
+EXPORT_SYMBOL(csum_partial_copy_generic)
+
+/*
+ * __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
+ *			   const struct in6_addr *daddr,
+ *			   __u32 len, __u8 proto, __wsum sum)
+ */
+
+_GLOBAL(csum_ipv6_magic)
+	lwz	r8, 0(r3)
+	lwz	r9, 4(r3)
+	addc	r0, r7, r8
+	lwz	r10, 8(r3)
+	adde	r0, r0, r9
+	lwz	r11, 12(r3)
+	adde	r0, r0, r10
+	lwz	r8, 0(r4)
+	adde	r0, r0, r11
+	lwz	r9, 4(r4)
+	adde	r0, r0, r8
+	lwz	r10, 8(r4)
+	adde	r0, r0, r9
+	lwz	r11, 12(r4)
+	adde	r0, r0, r10
+	add	r5, r5, r6	/* assumption: len + proto doesn't carry */
+	adde	r0, r0, r11
+	adde	r0, r0, r5
+	addze	r0, r0
+	rotlwi	r3, r0, 16
+	add	r3, r0, r3
+	not	r3, r3
+	rlwinm	r3, r3, 16, 16, 31
+	blr
+EXPORT_SYMBOL(csum_ipv6_magic)