1 files changed, 229 insertions, 0 deletions
diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S
new file mode 100644
index 000000000000..ef96c6c58efc
--- /dev/null
+++ b/arch/powerpc/lib/checksum_64.S
@@ -0,0 +1,229 @@
+/*
+ * 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/errno.h>
+#include <asm/ppc_asm.h>
+/*
+ * ip_fast_csum(r3=buf, r4=len) -- Optimized for IP header
+ * len is in words and is always >= 5.
+ *
+ * In practice len == 5, but this is not guaranteed.  So this code does not
+ * attempt to use doubleword instructions.
+ */
+_GLOBAL(ip_fast_csum)
+        lwz     r0,0(r3)
+        lwzu    r5,4(r3)
+        addic.  r4,r4,-2
+        addc    r0,r0,r5
+        mtctr   r4
+        blelr-
+1:      lwzu    r4,4(r3)
+        adde    r0,r0,r4
+        bdnz    1b
+        addze   r0,r0           /* add in final carry */
+        rldicl  r4,r0,32,0      /* fold two 32-bit halves together */
+        add     r0,r0,r4
+        srdi    r0,r0,32
+        rlwinm  r3,r0,16,0,31   /* fold two halves together */
+        add     r3,r0,r3
+        not     r3,r3
+        srwi    r3,r3,16
+        blr
+/*
+ * Compute checksum of TCP or UDP pseudo-header:
+ *   csum_tcpudp_magic(r3=saddr, r4=daddr, r5=len, r6=proto, r7=sum)
+ * No real gain trying to do this specially for 64 bit, but
+ * the 32 bit addition may spill into the upper bits of
+ * the doubleword so we still must fold it down from 64.
+ */     
+_GLOBAL(csum_tcpudp_magic)
+        rlwimi  r5,r6,16,0,15   /* put proto in upper half of len */
+        addc    r0,r3,r4        /* add 4 32-bit words together */
+        adde    r0,r0,r5
+        adde    r0,r0,r7
+        rldicl  r4,r0,32,0      /* fold 64 bit value */
+        add     r0,r4,r0
+        srdi    r0,r0,32
+        rlwinm  r3,r0,16,0,31   /* fold two halves together */
+        add     r3,r0,r3
+        not     r3,r3
+        srwi    r3,r3,16
+        blr
+/*
+ * Computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit).
+ *
+ * This code assumes at least halfword alignment, though the length
+ * can be any number of bytes.  The sum is accumulated in r5.
+ *
+ * csum_partial(r3=buff, r4=len, r5=sum)
+ */
+_GLOBAL(csum_partial)
+        subi    r3,r3,8         /* we'll offset by 8 for the loads */
+        srdi.   r6,r4,3         /* divide by 8 for doubleword count */
+        addic   r5,r5,0         /* clear carry */
+        beq     3f              /* if we're doing < 8 bytes */
+        andi.   r0,r3,2         /* aligned on a word boundary already? */
+        beq+    1f
+        lhz     r6,8(r3)        /* do 2 bytes to get aligned */
+        addi    r3,r3,2
+        subi    r4,r4,2
+        addc    r5,r5,r6
+        srdi.   r6,r4,3         /* recompute number of doublewords */
+        beq     3f              /* any left? */
+1:      mtctr   r6
+2:      ldu     r6,8(r3)        /* main sum loop */
+        adde    r5,r5,r6
+        bdnz    2b
+        andi.   r4,r4,7         /* compute bytes left to sum after doublewords */
+3:      cmpwi   0,r4,4          /* is at least a full word left? */
+        blt     4f
+        lwz     r6,8(r3)        /* sum this word */
+        addi    r3,r3,4
+        subi    r4,r4,4
+        adde    r5,r5,r6
+4:      cmpwi   0,r4,2          /* is at least a halfword left? */
+        blt+    5f
+        lhz     r6,8(r3)        /* sum this halfword */
+        addi    r3,r3,2
+        subi    r4,r4,2
+        adde    r5,r5,r6
+5:      cmpwi   0,r4,1          /* is at least a byte left? */
+        bne+    6f
+        lbz     r6,8(r3)        /* sum this byte */
+        slwi    r6,r6,8         /* this byte is assumed to be the upper byte of a halfword */
+        adde    r5,r5,r6
+6:      addze   r5,r5           /* add in final carry */
+        rldicl  r4,r5,32,0      /* fold two 32-bit halves together */
+        add     r3,r4,r5
+        srdi    r3,r3,32
+        blr
+/*
+ * 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.
+ *
+ * This code needs to be reworked to take advantage of 64 bit sum+copy.
+ * However, due to tokenring halfword alignment problems this will be very
+ * tricky.  For now we'll leave it until we instrument it somehow.
+ *
+ * csum_partial_copy_generic(r3=src, r4=dst, r5=len, r6=sum, r7=src_err, r8=dst_err)
+ */
+_GLOBAL(csum_partial_copy_generic)
+        addic   r0,r6,0
+        subi    r3,r3,4
+        subi    r4,r4,4
+        srwi.   r6,r5,2
+        beq     3f              /* if we're doing < 4 bytes */
+        andi.   r9,r4,2         /* Align dst to longword boundary */
+        beq+    1f
+81:     lhz     r6,4(r3)        /* do 2 bytes to get aligned */
+        addi    r3,r3,2
+        subi    r5,r5,2
+91:     sth     r6,4(r4)
+        addi    r4,r4,2
+        addc    r0,r0,r6
+        srwi.   r6,r5,2         /* # words to do */
+        beq     3f
+1:      mtctr   r6
+82:     lwzu    r6,4(r3)        /* the bdnz has zero overhead, so it should */
+92:     stwu    r6,4(r4)        /* be unnecessary to unroll this loop */
+        adde    r0,r0,r6
+        bdnz    82b
+        andi.   r5,r5,3
+3:      cmpwi   0,r5,2
+        blt+    4f
+83:     lhz     r6,4(r3)
+        addi    r3,r3,2
+        subi    r5,r5,2
+93:     sth     r6,4(r4)
+        addi    r4,r4,2
+        adde    r0,r0,r6
+4:      cmpwi   0,r5,1
+        bne+    5f
+84:     lbz     r6,4(r3)
+94:     stb     r6,4(r4)
+        slwi    r6,r6,8         /* Upper byte of word */
+        adde    r0,r0,r6
+5:      addze   r3,r0           /* add in final carry (unlikely with 64-bit regs) */
+        rldicl  r4,r3,32,0      /* fold 64 bit value */
+        add     r3,r4,r3
+        srdi    r3,r3,32
+        blr
+/* These shouldn't go in the fixup section, since that would
+   cause the ex_table addresses to get out of order. */
+        .globl src_error_1
+src_error_1:
+        li      r6,0
+        subi    r5,r5,2
+95:     sth     r6,4(r4)
+        addi    r4,r4,2
+        srwi.   r6,r5,2
+        beq     3f
+        mtctr   r6
+        .globl src_error_2
+src_error_2:
+        li      r6,0
+96:     stwu    r6,4(r4)
+        bdnz    96b
+3:      andi.   r5,r5,3
+        beq     src_error
+        .globl src_error_3
+src_error_3:
+        li      r6,0
+        mtctr   r5
+        addi    r4,r4,3
+97:     stbu    r6,1(r4)
+        bdnz    97b
+        .globl src_error
+src_error:
+        cmpdi   0,r7,0
+        beq     1f
+        li      r6,-EFAULT
+        stw     r6,0(r7)
+1:      addze   r3,r0
+        blr
+        .globl dst_error
+dst_error:
+        cmpdi   0,r8,0
+        beq     1f
+        li      r6,-EFAULT
+        stw     r6,0(r8)
+1:      addze   r3,r0
+        blr
+.section __ex_table,"a"
+        .align  3
+        .llong  81b,src_error_1
+        .llong  91b,dst_error
+        .llong  82b,src_error_2
+        .llong  92b,dst_error
+        .llong  83b,src_error_3
+        .llong  93b,dst_error
+        .llong  84b,src_error_3
+        .llong  94b,dst_error
+        .llong  95b,dst_error
+        .llong  96b,dst_error
+        .llong  97b,dst_error

diff --git a/arch/powerpc/lib/checksum_64.S b/arch/powerpc/lib/checksum_64.S new file mode 100644 index 000000000000..ef96c6c58efc --- /dev/null +++ b/arch/powerpc/lib/checksum_64.S
@@ -0,0 +1,229 @@
	1	/*
	2	* This file contains assembly-language implementations
	3	* of IP-style 1's complement checksum routines.
	4	*
	5	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*
	12	* Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au).
	13	*/
	14
	15	#include <linux/sys.h>
	16	#include <asm/processor.h>
	17	#include <asm/errno.h>
	18	#include <asm/ppc_asm.h>
	19
	20	/*
	21	* ip_fast_csum(r3=buf, r4=len) -- Optimized for IP header
	22	* len is in words and is always >= 5.
	23	*
	24	* In practice len == 5, but this is not guaranteed. So this code does not
	25	* attempt to use doubleword instructions.
	26	*/
	27	_GLOBAL(ip_fast_csum)
	28	lwz r0,0(r3)
	29	lwzu r5,4(r3)
	30	addic. r4,r4,-2
	31	addc r0,r0,r5
	32	mtctr r4
	33	blelr-
	34	1: lwzu r4,4(r3)
	35	adde r0,r0,r4
	36	bdnz 1b
	37	addze r0,r0 /* add in final carry */
	38	rldicl r4,r0,32,0 /* fold two 32-bit halves together */
	39	add r0,r0,r4
	40	srdi r0,r0,32
	41	rlwinm r3,r0,16,0,31 /* fold two halves together */
	42	add r3,r0,r3
	43	not r3,r3
	44	srwi r3,r3,16
	45	blr
	46
	47	/*
	48	* Compute checksum of TCP or UDP pseudo-header:
	49	* csum_tcpudp_magic(r3=saddr, r4=daddr, r5=len, r6=proto, r7=sum)
	50	* No real gain trying to do this specially for 64 bit, but
	51	* the 32 bit addition may spill into the upper bits of
	52	* the doubleword so we still must fold it down from 64.
	53	*/
	54	_GLOBAL(csum_tcpudp_magic)
	55	rlwimi r5,r6,16,0,15 /* put proto in upper half of len */
	56	addc r0,r3,r4 /* add 4 32-bit words together */
	57	adde r0,r0,r5
	58	adde r0,r0,r7
	59	rldicl r4,r0,32,0 /* fold 64 bit value */
	60	add r0,r4,r0
	61	srdi r0,r0,32
	62	rlwinm r3,r0,16,0,31 /* fold two halves together */
	63	add r3,r0,r3
	64	not r3,r3
	65	srwi r3,r3,16
	66	blr
	67
	68	/*
	69	* Computes the checksum of a memory block at buff, length len,
	70	* and adds in "sum" (32-bit).
	71	*
	72	* This code assumes at least halfword alignment, though the length
	73	* can be any number of bytes. The sum is accumulated in r5.
	74	*
	75	* csum_partial(r3=buff, r4=len, r5=sum)
	76	*/
	77	_GLOBAL(csum_partial)
	78	subi r3,r3,8 /* we'll offset by 8 for the loads */
	79	srdi. r6,r4,3 /* divide by 8 for doubleword count */
	80	addic r5,r5,0 /* clear carry */
	81	beq 3f /* if we're doing < 8 bytes */
	82	andi. r0,r3,2 /* aligned on a word boundary already? */
	83	beq+ 1f
	84	lhz r6,8(r3) /* do 2 bytes to get aligned */
	85	addi r3,r3,2
	86	subi r4,r4,2
	87	addc r5,r5,r6
	88	srdi. r6,r4,3 /* recompute number of doublewords */
	89	beq 3f /* any left? */
	90	1: mtctr r6
	91	2: ldu r6,8(r3) /* main sum loop */
	92	adde r5,r5,r6
	93	bdnz 2b
	94	andi. r4,r4,7 /* compute bytes left to sum after doublewords */
	95	3: cmpwi 0,r4,4 /* is at least a full word left? */
	96	blt 4f
	97	lwz r6,8(r3) /* sum this word */
	98	addi r3,r3,4
	99	subi r4,r4,4
	100	adde r5,r5,r6
	101	4: cmpwi 0,r4,2 /* is at least a halfword left? */
	102	blt+ 5f
	103	lhz r6,8(r3) /* sum this halfword */
	104	addi r3,r3,2
	105	subi r4,r4,2
	106	adde r5,r5,r6
	107	5: cmpwi 0,r4,1 /* is at least a byte left? */
	108	bne+ 6f
	109	lbz r6,8(r3) /* sum this byte */
	110	slwi r6,r6,8 /* this byte is assumed to be the upper byte of a halfword */
	111	adde r5,r5,r6
	112	6: addze r5,r5 /* add in final carry */
	113	rldicl r4,r5,32,0 /* fold two 32-bit halves together */
	114	add r3,r4,r5
	115	srdi r3,r3,32
	116	blr
	117
	118	/*
	119	* Computes the checksum of a memory block at src, length len,
	120	* and adds in "sum" (32-bit), while copying the block to dst.
	121	* If an access exception occurs on src or dst, it stores -EFAULT
	122	* to src_err or dst_err respectively, and (for an error on
	123	* src) zeroes the rest of dst.
	124	*
	125	* This code needs to be reworked to take advantage of 64 bit sum+copy.
	126	* However, due to tokenring halfword alignment problems this will be very
	127	* tricky. For now we'll leave it until we instrument it somehow.
	128	*
	129	* csum_partial_copy_generic(r3=src, r4=dst, r5=len, r6=sum, r7=src_err, r8=dst_err)
	130	*/
	131	_GLOBAL(csum_partial_copy_generic)
	132	addic r0,r6,0
	133	subi r3,r3,4
	134	subi r4,r4,4
	135	srwi. r6,r5,2
	136	beq 3f /* if we're doing < 4 bytes */
	137	andi. r9,r4,2 /* Align dst to longword boundary */
	138	beq+ 1f
	139	81: lhz r6,4(r3) /* do 2 bytes to get aligned */
	140	addi r3,r3,2
	141	subi r5,r5,2
	142	91: sth r6,4(r4)
	143	addi r4,r4,2
	144	addc r0,r0,r6
	145	srwi. r6,r5,2 /* # words to do */
	146	beq 3f
	147	1: mtctr r6
	148	82: lwzu r6,4(r3) /* the bdnz has zero overhead, so it should */
	149	92: stwu r6,4(r4) /* be unnecessary to unroll this loop */
	150	adde r0,r0,r6
	151	bdnz 82b
	152	andi. r5,r5,3
	153	3: cmpwi 0,r5,2
	154	blt+ 4f
	155	83: lhz r6,4(r3)
	156	addi r3,r3,2
	157	subi r5,r5,2
	158	93: sth r6,4(r4)
	159	addi r4,r4,2
	160	adde r0,r0,r6
	161	4: cmpwi 0,r5,1
	162	bne+ 5f
	163	84: lbz r6,4(r3)
	164	94: stb r6,4(r4)
	165	slwi r6,r6,8 /* Upper byte of word */
	166	adde r0,r0,r6
	167	5: addze r3,r0 /* add in final carry (unlikely with 64-bit regs) */
	168	rldicl r4,r3,32,0 /* fold 64 bit value */
	169	add r3,r4,r3
	170	srdi r3,r3,32
	171	blr
	172
	173	/* These shouldn't go in the fixup section, since that would
	174	cause the ex_table addresses to get out of order. */
	175
	176	.globl src_error_1
	177	src_error_1:
	178	li r6,0
	179	subi r5,r5,2
	180	95: sth r6,4(r4)
	181	addi r4,r4,2
	182	srwi. r6,r5,2
	183	beq 3f
	184	mtctr r6
	185	.globl src_error_2
	186	src_error_2:
	187	li r6,0
	188	96: stwu r6,4(r4)
	189	bdnz 96b
	190	3: andi. r5,r5,3
	191	beq src_error
	192	.globl src_error_3
	193	src_error_3:
	194	li r6,0
	195	mtctr r5
	196	addi r4,r4,3
	197	97: stbu r6,1(r4)
	198	bdnz 97b
	199	.globl src_error
	200	src_error:
	201	cmpdi 0,r7,0
	202	beq 1f
	203	li r6,-EFAULT
	204	stw r6,0(r7)
	205	1: addze r3,r0
	206	blr
	207
	208	.globl dst_error
	209	dst_error:
	210	cmpdi 0,r8,0
	211	beq 1f
	212	li r6,-EFAULT
	213	stw r6,0(r8)
	214	1: addze r3,r0
	215	blr
	216
	217	.section __ex_table,"a"
	218	.align 3
	219	.llong 81b,src_error_1
	220	.llong 91b,dst_error
	221	.llong 82b,src_error_2
	222	.llong 92b,dst_error
	223	.llong 83b,src_error_3
	224	.llong 93b,dst_error
	225	.llong 84b,src_error_3
	226	.llong 94b,dst_error
	227	.llong 95b,dst_error
	228	.llong 96b,dst_error
	229	.llong 97b,dst_error