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-rw-r--r--arch/sparc/lib/ipcsum.S34
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/sparc/lib/ipcsum.S b/arch/sparc/lib/ipcsum.S
new file mode 100644
index 000000000000..58ca5b9a8778
--- /dev/null
+++ b/arch/sparc/lib/ipcsum.S
@@ -0,0 +1,34 @@
1 .text
2 .align 32
3 .globl ip_fast_csum
4 .type ip_fast_csum,#function
5ip_fast_csum: /* %o0 = iph, %o1 = ihl */
6 sub %o1, 4, %g7
7 lduw [%o0 + 0x00], %o2
8 lduw [%o0 + 0x04], %g2
9 lduw [%o0 + 0x08], %g3
10 addcc %g2, %o2, %o2
11 lduw [%o0 + 0x0c], %g2
12 addccc %g3, %o2, %o2
13 lduw [%o0 + 0x10], %g3
14
15 addccc %g2, %o2, %o2
16 addc %o2, %g0, %o2
171: addcc %g3, %o2, %o2
18 add %o0, 4, %o0
19 addccc %o2, %g0, %o2
20 subcc %g7, 1, %g7
21 be,a,pt %icc, 2f
22 sll %o2, 16, %g2
23
24 lduw [%o0 + 0x10], %g3
25 ba,pt %xcc, 1b
26 nop
272: addcc %o2, %g2, %g2
28 srl %g2, 16, %o2
29 addc %o2, %g0, %o2
30 xnor %g0, %o2, %o2
31 set 0xffff, %o1
32 retl
33 and %o2, %o1, %o0
34 .size ip_fast_csum, .-ip_fast_csum