diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/include/asm-xeno/checksum.h')
| -rw-r--r-- | xenolinux-2.4.21-pre4-sparse/include/asm-xeno/checksum.h | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/checksum.h b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/checksum.h deleted file mode 100644 index 6b9761aa8f..0000000000 --- a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/checksum.h +++ /dev/null @@ -1,195 +0,0 @@ -#ifndef _I386_CHECKSUM_H -#define _I386_CHECKSUM_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, and handles user-space pointer exceptions correctly, when needed. - * - * here even more important to align src and dst on a 32-bit (or even - * better 64-bit) boundary - */ - -asmlinkage unsigned int csum_partial_copy_generic( const char *src, char *dst, int len, int sum, - int *src_err_ptr, int *dst_err_ptr); - -/* - * Note: when you get a NULL pointer exception here this means someone - * passed in an incorrect kernel address to one of these functions. - * - * If you use these functions directly please don't forget the - * verify_area(). - */ -static __inline__ -unsigned int csum_partial_copy_nocheck ( const char *src, char *dst, - int len, int sum) -{ - return csum_partial_copy_generic ( src, dst, len, sum, NULL, NULL); -} - -static __inline__ -unsigned int csum_partial_copy_from_user ( const char *src, char *dst, - int len, int sum, int *err_ptr) -{ - return csum_partial_copy_generic ( src, dst, len, sum, err_ptr, NULL); -} - -/* - * These are the old (and unsafe) way of doing checksums, a warning message will be - * printed if they are used and an exeption occurs. - * - * these functions should go away after some time. - */ - -#define csum_partial_copy_fromuser csum_partial_copy -unsigned int csum_partial_copy( const char *src, char *dst, int len, int sum); - -/* - * This is a version of ip_compute_csum() optimized for IP headers, - * which always checksum on 4 octet boundaries. - * - * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by - * Arnt Gulbrandsen. - */ -static inline unsigned short ip_fast_csum(unsigned char * iph, - unsigned int ihl) -{ - unsigned int sum; - - __asm__ __volatile__( - "movl (%1), %0 ;\n" - "subl $4, %2 ;\n" - "jbe 2f ;\n" - "addl 4(%1), %0 ;\n" - "adcl 8(%1), %0 ;\n" - "adcl 12(%1), %0 ;\n" -"1: adcl 16(%1), %0 ;\n" - "lea 4(%1), %1 ;\n" - "decl %2 ;\n" - "jne 1b ;\n" - "adcl $0, %0 ;\n" - "movl %0, %2 ;\n" - "shrl $16, %0 ;\n" - "addw %w2, %w0 ;\n" - "adcl $0, %0 ;\n" - "notl %0 ;\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) - : "1" (iph), "2" (ihl)); - return(sum); -} - -/* - * Fold a partial checksum - */ - -static inline unsigned int csum_fold(unsigned int sum) -{ - __asm__( - "addl %1, %0 ;\n" - "adcl $0xffff, %0 ;\n" - : "=r" (sum) - : "r" (sum << 16), "0" (sum & 0xffff0000) - ); - return (~sum) >> 16; -} - -static inline unsigned long csum_tcpudp_nofold(unsigned long saddr, - unsigned long daddr, - unsigned short len, - unsigned short proto, - unsigned int sum) -{ - __asm__( - "addl %1, %0 ;\n" - "adcl %2, %0 ;\n" - "adcl %3, %0 ;\n" - "adcl $0, %0 ;\n" - : "=r" (sum) - : "g" (daddr), "g"(saddr), "g"((ntohs(len)<<16)+proto*256), "0"(sum)); - 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, - __u32 len, - unsigned short proto, - unsigned int sum) -{ - __asm__( - "addl 0(%1), %0 ;\n" - "adcl 4(%1), %0 ;\n" - "adcl 8(%1), %0 ;\n" - "adcl 12(%1), %0 ;\n" - "adcl 0(%2), %0 ;\n" - "adcl 4(%2), %0 ;\n" - "adcl 8(%2), %0 ;\n" - "adcl 12(%2), %0 ;\n" - "adcl %3, %0 ;\n" - "adcl %4, %0 ;\n" - "adcl $0, %0 ;\n" - : "=&r" (sum) - : "r" (saddr), "r" (daddr), - "r"(htonl(len)), "r"(htonl(proto)), "0"(sum)); - - return csum_fold(sum); -} - -/* - * Copy and checksum to user - */ -#define HAVE_CSUM_COPY_USER -static __inline__ unsigned int csum_and_copy_to_user(const char *src, char *dst, - int len, int sum, int *err_ptr) -{ - if (access_ok(VERIFY_WRITE, dst, len)) - return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr); - - if (len) - *err_ptr = -EFAULT; - - return -1; /* invalid checksum */ -} - -#endif |