From 556dcee7b829e5c350c3ffdbdb87a8b15aa3c5d3 Mon Sep 17 00:00:00 2001 From: Jesper Nilsson Date: Tue, 21 Oct 2008 17:45:58 +0200 Subject: [CRIS] Move header files from include to arch/cris/include. Change all users of header files to correct path. Remove some unneeded headers for arch-v32. Signed-off-by: Jesper Nilsson --- arch/cris/include/arch-v32/arch/checksum.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 arch/cris/include/arch-v32/arch/checksum.h (limited to 'arch/cris/include/arch-v32/arch/checksum.h') diff --git a/arch/cris/include/arch-v32/arch/checksum.h b/arch/cris/include/arch-v32/arch/checksum.h new file mode 100644 index 0000000..e5dcfce --- /dev/null +++ b/arch/cris/include/arch-v32/arch/checksum.h @@ -0,0 +1,29 @@ +#ifndef _ASM_CRIS_ARCH_CHECKSUM_H +#define _ASM_CRIS_ARCH_CHECKSUM_H + +/* + * Check values used in TCP/UDP headers. + * + * The gain of doing this in assembler instead of C, is that C doesn't + * generate carry-additions for the 32-bit components of the + * checksum. Which means it would be necessary to split all those into + * 16-bit components and then add. + */ +static inline __wsum +csum_tcpudp_nofold(__be32 saddr, __be32 daddr, + unsigned short len, unsigned short proto, __wsum sum) +{ + __wsum res; + + __asm__ __volatile__ ("add.d %2, %0\n\t" + "addc %3, %0\n\t" + "addc %4, %0\n\t" + "addc 0, %0\n\t" + : "=r" (res) + : "0" (sum), "r" (daddr), "r" (saddr), \ + "r" ((len + proto) << 8)); + + return res; +} + +#endif /* _ASM_CRIS_ARCH_CHECKSUM_H */ -- cgit v1.1