b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/* MN10300 Optimised checksumming wrappers
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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#include <asm/checksum.h>
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#include "internal.h"
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static inline unsigned short from32to16(__wsum sum)
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{
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asm(" add %1,%0 \n"
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" addc 0xffff,%0 \n"
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: "=r" (sum)
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: "r" (sum << 16), "0" (sum & 0xffff0000)
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);
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return sum >> 16;
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}
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__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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return ~do_csum(iph, ihl * 4);
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}
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EXPORT_SYMBOL(ip_fast_csum);
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__wsum csum_partial(const void *buff, int len, __wsum sum)
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{
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__wsum result;
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result = do_csum(buff, len);
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result += sum;
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if (sum > result)
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result++;
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return result;
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}
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EXPORT_SYMBOL(csum_partial);
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__sum16 ip_compute_csum(const void *buff, int len)
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{
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return ~from32to16(do_csum(buff, len));
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}
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EXPORT_SYMBOL(ip_compute_csum);
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__wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum)
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{
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copy_from_user(dst, src, len);
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return csum_partial(dst, len, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy);
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__wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum)
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{
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sum = csum_partial(src, len, sum);
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memcpy(dst, src, len);
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return sum;
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}
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EXPORT_SYMBOL(csum_partial_copy_nocheck);
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__wsum csum_partial_copy_from_user(const void *src, void *dst,
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int len, __wsum sum,
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int *err_ptr)
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{
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int missing;
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missing = copy_from_user(dst, src, len);
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if (missing) {
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memset(dst + len - missing, 0, missing);
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*err_ptr = -EFAULT;
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}
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return csum_partial(dst, len, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy_from_user);
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__wsum csum_and_copy_to_user(const void *src, void *dst,
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int len, __wsum sum,
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int *err_ptr)
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{
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int missing;
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missing = copy_to_user(dst, src, len);
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if (missing) {
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memset(dst + len - missing, 0, missing);
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*err_ptr = -EFAULT;
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}
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return csum_partial(src, len, sum);
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}
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EXPORT_SYMBOL(csum_and_copy_to_user);
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