diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-28 12:34:01 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-28 12:34:01 -0700 |
commit | 604a2785a8482cad4d63202465133c720db5eda7 (patch) | |
tree | e2f510a8a54d7d4443cb52f3a0be46f527ebb779 /arch/blackfin/include/asm/checksum.h | |
parent | 66833d5f3934a19d0988b7d0de58149bfd7a5884 (diff) | |
parent | d310fb4bb73629840430cb13cb282915e49fef4b (diff) |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/blackfin-2.6:
Blackfin arch: Fix PM building on BF52x: No ROTWE on BF52x, add USBWE
Blackfin arch: sram: use 'unsigned long' for irqflags
Blackfin arch: let PCI depend on BROKEN
Blackfin arch: move include/asm-blackfin header files to arch/blackfin
Blackfin arch: fix bug - MPU crashes under stress
Blackfin arch: Fix bug - when to rmmod the L1_module, it stucks and then reboot the board.
Blackfin arch: dont actually need to muck with EMAC_SYSTAT for BF52x for demuxing
Blackfin arch: Add MTD Partitions for MTD_DATAFLASH, increase max SPI SCLK
Diffstat (limited to 'arch/blackfin/include/asm/checksum.h')
-rw-r--r-- | arch/blackfin/include/asm/checksum.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/checksum.h b/arch/blackfin/include/asm/checksum.h new file mode 100644 index 00000000000..6f6af2b8e9e --- /dev/null +++ b/arch/blackfin/include/asm/checksum.h @@ -0,0 +1,100 @@ +#ifndef _BFIN_CHECKSUM_H +#define _BFIN_CHECKSUM_H + +/* + * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com + * + * 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 + */ +__wsum csum_partial(const void *buff, int len, __wsum 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 + */ + +__wsum csum_partial_copy(const void *src, void *dst, + int len, __wsum sum); + +/* + * the same as csum_partial_copy, but copies from user space. + * + * here even more important to align src and dst on a 32-bit (or even + * better 64-bit) boundary + */ + +extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, + int len, __wsum sum, int *csum_err); + +#define csum_partial_copy_nocheck(src, dst, len, sum) \ + csum_partial_copy((src), (dst), (len), (sum)) + +__sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl); + +/* + * Fold a partial checksum + */ + +static inline __sum16 csum_fold(__wsum sum) +{ + while (sum >> 16) + sum = (sum & 0xffff) + (sum >> 16); + return ((~(sum << 16)) >> 16); +} + +/* + * computes the checksum of the TCP/UDP pseudo-header + * returns a 16-bit checksum, already complemented + */ + +static inline __wsum +csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, + unsigned short proto, __wsum sum) +{ + + __asm__ ("%0 = %0 + %1;\n\t" + "CC = AC0;\n\t" + "if !CC jump 4;\n\t" + "%0 = %0 + %4;\n\t" + "%0 = %0 + %2;\n\t" + "CC = AC0;\n\t" + "if !CC jump 4;\n\t" + "%0 = %0 + %4;\n\t" + "%0 = %0 + %3;\n\t" + "CC = AC0;\n\t" + "if !CC jump 4;\n\t" + "%0 = %0 + %4;\n\t" + "NOP;\n\t" + : "=d" (sum) + : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum)); + + return (sum); +} + +static inline __sum16 +csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, + unsigned short proto, __wsum 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 + */ + +extern __sum16 ip_compute_csum(const void *buff, int len); + +#endif /* _BFIN_CHECKSUM_H */ |