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Convert in_cksum() to new generalized cpu_in_cksum().

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This commit is contained in:
uwe 2008-02-02 02:15:40 +00:00
parent d6b98318d5
commit 8c87580a0e
1 changed files with 39 additions and 11 deletions
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50
sys/arch/sh3/sh3/cpu_in_cksum.S
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@ -1,4 +1,4 @@
/* $NetBSD: cpu_in_cksum.S,v 1.1 2008/02/02 02:11:19 uwe Exp $ */
/* $NetBSD: cpu_in_cksum.S,v 1.2 2008/02/02 02:15:40 uwe Exp $ */
/*-
* Copyright (c) 2000 SHIMIZU Ryo <ryo@misakimix.org>
@ -31,6 +31,8 @@
#include <machine/asm.h>
#include "assym.h"
__KERNEL_RCSID(0, "$NetBSD: cpu_in_cksum.S,v 1.2 2008/02/02 02:15:40 uwe Exp $")
#define reg_tmp0 r0
#define reg_byte_swapped r1
@ -38,8 +40,9 @@
#define reg_tmp3 r3
#define reg_m r4
#define reg_len r5
#define reg_sum r6
#define reg_w r7
#define reg_off r6
#define reg_w r6 /* recycle */
#define reg_sum r7
#define REDUCE \
@ -88,18 +91,38 @@
* LINTSTUB: include <sys/param.h>
* LINTSTUB: include <sys/mbuf.h>
*
* LINTSTUB: Func: int in_cksum(struct mbuf *m, int len);
* LINTSTUB: Func: int cpu_in_cksum(struct mbuf *m, int len, int off, uint32_t initial_sum);
*/
ENTRY(in_cksum)
ENTRY(cpu_in_cksum)
sts.l pr,@-sp
mov #0,reg_sum
mov #0,reg_byte_swapped
tst reg_len,reg_len
tst reg_len, reg_len
bt/s mbuf_loop_done
mov #0, reg_byte_swapped
.L_mbuf_skip:
tst reg_m, reg_m
bt out_of_mbufs
mov.l @(M_LEN, reg_m), reg_mlen
cmp/gt reg_off, reg_mlen /* mlen > off ? */
bt .L_mbuf_found
!! while (off >= mlen)
mov.l @(M_NEXT, reg_m), reg_m ! m = m->m_next
bra .L_mbuf_skip
sub reg_mlen, reg_off ! off -= mlen
.L_mbuf_found: !! if (mlen > off)
mov.l @(M_DATA, reg_m), reg_tmp3
sub reg_off, reg_mlen ! mlen -= off
bra .L_mbuf_loop_enter
add reg_tmp3, reg_off ! w = m->m_data + off
#undef reg_off /* it is dead now and we recycle it for reg_w */
mbuf_loop:
tst reg_m,reg_m
bt out_of_mbufs
@ -110,6 +133,11 @@ mbuf_loop:
mov.l @(M_DATA,reg_m),reg_w
!! Entry point for mbuf loop. We jump here after we have
!! found the mbuf (reg_m) that contains data at the specified
!! offset. reg_mlen and reg_w were adjusted to point at the
!! first interesting byte of data.
.L_mbuf_loop_enter:
cmp/ge reg_mlen,reg_len
bt 1f
mov reg_len,reg_mlen