diff options
| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2015-05-19 15:18:57 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2015-08-08 03:59:19 (GMT) |
| commit | 501c8de7b061d2dc0c21a0a79fee3eddf30af8dd (patch) | |
| tree | e06b9dcf4206de9f6a00cce28fca21929a6373ec /arch/powerpc/include | |
| parent | 92c985f1d76c228abe202cb3004f03c9b45860d1 (diff) | |
| download | linux-501c8de7b061d2dc0c21a0a79fee3eddf30af8dd.tar.xz | |
powerpc: add support for csum_add()
The C version of csum_add() as defined in include/net/checksum.h gives
the following assembly in ppc32:
0: 7c 04 1a 14 add r0,r4,r3
4: 7c 64 00 10 subfc r3,r4,r0
8: 7c 63 19 10 subfe r3,r3,r3
c: 7c 63 00 50 subf r3,r3,r0
and the following in ppc64:
0xc000000000001af8 <+0>: add r3,r3,r4
0xc000000000001afc <+4>: cmplw cr7,r3,r4
0xc000000000001b00 <+8>: mfcr r4
0xc000000000001b04 <+12>: rlwinm r4,r4,29,31,31
0xc000000000001b08 <+16>: add r3,r4,r3
0xc000000000001b0c <+20>: clrldi r3,r3,32
0xc000000000001b10 <+24>: blr
include/net/checksum.h also offers the possibility to define an arch
specific function. This patch provides a specific csum_add() inline
function.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/checksum.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h index 5e43d2d..e8d9ef4 100644 --- a/arch/powerpc/include/asm/checksum.h +++ b/arch/powerpc/include/asm/checksum.h @@ -130,6 +130,22 @@ static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); } +#define HAVE_ARCH_CSUM_ADD +static inline __wsum csum_add(__wsum csum, __wsum addend) +{ +#ifdef __powerpc64__ + u64 res = (__force u64)csum; + + res += (__force u64)addend; + return (__force __wsum)((u32)res + (res >> 32)); +#else + asm("addc %0,%0,%1;" + "addze %0,%0;" + : "+r" (csum) : "r" (addend)); + return csum; +#endif +} + #endif #endif /* __KERNEL__ */ #endif |