include/asm-m32r/checksum.h

#ifdef __KERNEL__
#ifndef _ASM_M32R_CHECKSUM_H
#define _ASM_M32R_CHECKSUM_H

/*
 * include/asm-m32r/checksum.h
 *
 * IP/TCP/UDP checksum routines
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Some code taken from mips and parisc architecture.
 *
 *    Copyright (C) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata
 *    Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
 */

#include <linux/in6.h>

/*
 * computes the checksum of a memory block at buff, length len,
 * and adds in "sum" (32-bit)
 *
 * returns a 32-bit number suitable for feeding into itself
 * or csum_tcpudp_magic
 *
 * this function must be called with even lengths, except
 * for the last fragment, which may be odd
 *
 * it's best to have buff aligned on a 32-bit boundary
 */
asmlinkage unsigned int csum_partial(const unsigned char *buff,
				     int len, unsigned int sum);

/*
 * The same as csum_partial, but copies from src while it checksums.
 *
 * Here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
					      unsigned char *dst,
                                              int len, unsigned int sum);

/*
 * This is a new version of the above that records errors it finds in *errp,
 * but continues and zeros thre rest of the buffer.
 */
extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
                                                unsigned char *dst,
                                                int len, unsigned int sum,
                                                int *err_ptr);

/*
 *	Fold a partial checksum
 */

static inline unsigned int csum_fold(unsigned int sum)
{
	unsigned long tmpreg;
	__asm__(
		"	sll3	%1, %0, #16 \n"
		"	cmp	%0, %0 \n"
		"	addx	%0, %1 \n"
		"	ldi	%1, #0 \n"
		"	srli	%0, #16 \n"
		"	addx	%0, %1 \n"
		"	xor3	%0, %0, #0x0000ffff \n"
		: "=r" (sum), "=&r" (tmpreg)
		: "0"  (sum)
		: "cbit"
	);
	return sum;
}

/*
 * This is a version of ip_compute_csum() optimized for IP headers,
 * which always checksum on 4 octet boundaries.
 */
static inline unsigned short ip_fast_csum(unsigned char * iph,
					  unsigned int ihl) {
	unsigned long sum, tmpreg0, tmpreg1;

	__asm__ __volatile__(
		"	ld	%0, @%1+ \n"
		"	addi	%2, #-4 \n"
		"#	bgez	%2, 2f \n"
		"	cmp	%0, %0 \n"
		"	ld	%3, @%1+ \n"
		"	ld	%4, @%1+ \n"
		"	addx	%0, %3 \n"
		"	ld	%3, @%1+ \n"
		"	addx	%0, %4 \n"
		"	addx	%0, %3 \n"
		"	.fillinsn\n"
		"1: \n"
		"	ld	%4, @%1+ \n"
		"	addi	%2, #-1 \n"
		"	addx	%0, %4 \n"
		"	bgtz	%2, 1b \n"
		"\n"
		"	ldi	%3, #0 \n"
		"	addx	%0, %3 \n"
		"	.fillinsn\n"
		"2: \n"
	/* Since the input registers which are loaded with iph and ipl
	   are modified, we must also specify them as outputs, or gcc
	   will assume they contain their original values. */
	: "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
	: "1" (iph), "2" (ihl)
	: "cbit", "memory");

	return csum_fold(sum);
}

static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
					       unsigned long daddr,
					       unsigned short len,
					       unsigned short proto,
					       unsigned int sum)
{
#if defined(__LITTLE_ENDIAN)
	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
#else
	unsigned long len_proto = (proto<<16)+len;
#endif
	unsigned long tmpreg;

	__asm__(
		"	cmp	%0, %0 \n"
		"	addx	%0, %2 \n"
		"	addx	%0, %3 \n"
		"	addx	%0, %4 \n"
		"	ldi	%1, #0 \n"
		"	addx	%0, %1 \n"
		: "=r" (sum), "=&r" (tmpreg)
		: "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
		: "cbit"
	);

	return sum;
}

/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
						   unsigned long daddr,
						   unsigned short len,
						   unsigned short proto,
						   unsigned int sum)
{
	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}

/*
 * this routine is used for miscellaneous IP-like checksums, mainly
 * in icmp.c
 */

static inline unsigned short ip_compute_csum(unsigned char * buff, int len) {
	return csum_fold (csum_partial(buff, len, 0));
}

#define _HAVE_ARCH_IPV6_CSUM
static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
						 struct in6_addr *daddr,
						 __u16 len,
						 unsigned short proto,
						 unsigned int sum)
{
	unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
	__asm__(
		"	ld	%1, @(%5) \n"
		"	ld	%2, @(4,%5) \n"
		"	ld	%3, @(8,%5) \n"
		"	ld	%4, @(12,%5) \n"
		"	add	%0, %1 \n"
		"	addx	%0, %2 \n"
		"	addx	%0, %3 \n"
		"	addx	%0, %4 \n"
		"	ld	%1, @(%6) \n"
		"	ld	%2, @(4,%6) \n"
		"	ld	%3, @(8,%6) \n"
		"	ld	%4, @(12,%6) \n"
		"	addx	%0, %1 \n"
		"	addx	%0, %2 \n"
		"	addx	%0, %3 \n"
		"	addx	%0, %4 \n"
		"	addx	%0, %7 \n"
		"	addx	%0, %8 \n"
		"	ldi	%1, #0 \n"
		"	addx	%0, %1 \n"
		: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
		  "=&r" (tmpreg2), "=&r" (tmpreg3)
		: "r" (saddr), "r" (daddr),
		  "r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum)
		: "cbit"
	);

	return csum_fold(sum);
}

#endif /* _ASM_M32R_CHECKSUM_H */
#endif /* __KERNEL__ */
1	#ifdef __KERNEL__
2	#ifndef _ASM_M32R_CHECKSUM_H
3	#define _ASM_M32R_CHECKSUM_H
4
5	/*
6	* include/asm-m32r/checksum.h
7	*
8	* IP/TCP/UDP checksum routines
9	*
10	* This file is subject to the terms and conditions of the GNU General Public
11	* License. See the file "COPYING" in the main directory of this archive
12	* for more details.
13	*
14	* Some code taken from mips and parisc architecture.
15	*
16	* Copyright (C) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata
17	* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
18	*/
19
20	#include <linux/in6.h>
21
22	/*
23	* computes the checksum of a memory block at buff, length len,
24	* and adds in "sum" (32-bit)
25	*
26	* returns a 32-bit number suitable for feeding into itself
27	* or csum_tcpudp_magic
28	*
29	* this function must be called with even lengths, except
30	* for the last fragment, which may be odd
31	*
32	* it's best to have buff aligned on a 32-bit boundary
33	*/
34	asmlinkage unsigned int csum_partial(const unsigned char *buff,
35	int len, unsigned int sum);
36
37	/*
38	* The same as csum_partial, but copies from src while it checksums.
39	*
40	* Here even more important to align src and dst on a 32-bit (or even
41	* better 64-bit) boundary
42	*/
43	extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
44	unsigned char *dst,
45	int len, unsigned int sum);
46
47	/*
48	* This is a new version of the above that records errors it finds in *errp,
49	* but continues and zeros thre rest of the buffer.
50	*/
51	extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src,
52	unsigned char *dst,
53	int len, unsigned int sum,
54	int *err_ptr);
55
56	/*
57	* Fold a partial checksum
58	*/
59
60	static inline unsigned int csum_fold(unsigned int sum)
61	{
62	unsigned long tmpreg;
63	__asm__(
64	" sll3 %1, %0, #16 \n"
65	" cmp %0, %0 \n"
66	" addx %0, %1 \n"
67	" ldi %1, #0 \n"
68	" srli %0, #16 \n"
69	" addx %0, %1 \n"
70	" xor3 %0, %0, #0x0000ffff \n"
71	: "=r" (sum), "=&r" (tmpreg)
72	: "0" (sum)
73	: "cbit"
74	);
75	return sum;
76	}
77
78	/*
79	* This is a version of ip_compute_csum() optimized for IP headers,
80	* which always checksum on 4 octet boundaries.
81	*/
82	static inline unsigned short ip_fast_csum(unsigned char * iph,
83	unsigned int ihl) {
84	unsigned long sum, tmpreg0, tmpreg1;
85
86	__asm__ __volatile__(
87	" ld %0, @%1+ \n"
88	" addi %2, #-4 \n"
89	"# bgez %2, 2f \n"
90	" cmp %0, %0 \n"
91	" ld %3, @%1+ \n"
92	" ld %4, @%1+ \n"
93	" addx %0, %3 \n"
94	" ld %3, @%1+ \n"
95	" addx %0, %4 \n"
96	" addx %0, %3 \n"
97	" .fillinsn\n"
98	"1: \n"
99	" ld %4, @%1+ \n"
100	" addi %2, #-1 \n"
101	" addx %0, %4 \n"
102	" bgtz %2, 1b \n"
103	"\n"
104	" ldi %3, #0 \n"
105	" addx %0, %3 \n"
106	" .fillinsn\n"
107	"2: \n"
108	/* Since the input registers which are loaded with iph and ipl
109	are modified, we must also specify them as outputs, or gcc
110	will assume they contain their original values. */
111	: "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
112	: "1" (iph), "2" (ihl)
113	: "cbit", "memory");
114
115	return csum_fold(sum);
116	}
117
118	static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
119	unsigned long daddr,
120	unsigned short len,
121	unsigned short proto,
122	unsigned int sum)
123	{
124	#if defined(__LITTLE_ENDIAN)
125	unsigned long len_proto = (ntohs(len)<<16)+proto*256;
126	#else
127	unsigned long len_proto = (proto<<16)+len;
128	#endif
129	unsigned long tmpreg;
130
131	__asm__(
132	" cmp %0, %0 \n"
133	" addx %0, %2 \n"
134	" addx %0, %3 \n"
135	" addx %0, %4 \n"
136	" ldi %1, #0 \n"
137	" addx %0, %1 \n"
138	: "=r" (sum), "=&r" (tmpreg)
139	: "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
140	: "cbit"
141	);
142
143	return sum;
144	}
145
146	/*
147	* computes the checksum of the TCP/UDP pseudo-header
148	* returns a 16-bit checksum, already complemented
149	*/
150	static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
151	unsigned long daddr,
152	unsigned short len,
153	unsigned short proto,
154	unsigned int sum)
155	{
156	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
157	}
158
159	/*
160	* this routine is used for miscellaneous IP-like checksums, mainly
161	* in icmp.c
162	*/
163
164	static inline unsigned short ip_compute_csum(unsigned char * buff, int len) {
165	return csum_fold (csum_partial(buff, len, 0));
166	}
167
168	#define _HAVE_ARCH_IPV6_CSUM
169	static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
170	struct in6_addr *daddr,
171	__u16 len,
172	unsigned short proto,
173	unsigned int sum)
174	{
175	unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
176	__asm__(
177	" ld %1, @(%5) \n"
178	" ld %2, @(4,%5) \n"
179	" ld %3, @(8,%5) \n"
180	" ld %4, @(12,%5) \n"
181	" add %0, %1 \n"
182	" addx %0, %2 \n"
183	" addx %0, %3 \n"
184	" addx %0, %4 \n"
185	" ld %1, @(%6) \n"
186	" ld %2, @(4,%6) \n"
187	" ld %3, @(8,%6) \n"
188	" ld %4, @(12,%6) \n"
189	" addx %0, %1 \n"
190	" addx %0, %2 \n"
191	" addx %0, %3 \n"
192	" addx %0, %4 \n"
193	" addx %0, %7 \n"
194	" addx %0, %8 \n"
195	" ldi %1, #0 \n"
196	" addx %0, %1 \n"
197	: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
198	"=&r" (tmpreg2), "=&r" (tmpreg3)
199	: "r" (saddr), "r" (daddr),
200	"r" (htonl((__u32) (len))), "r" (htonl(proto)), "0" (sum)
201	: "cbit"
202	);
203
204	return csum_fold(sum);
205	}
206
207	#endif /* _ASM_M32R_CHECKSUM_H */
208	#endif /* __KERNEL__ */