mirror of
https://github.com/fail0verflow/switch-coreboot.git
synced 2025-05-04 01:39:18 -04:00
71ccb36afc
- Everything in include/cpu/generic/x86/arch/* goes into include/arch/x86 now. - include/cpu/generic/x86/div64.h moves into include/arch/x86, too. - The former include/cpu/generic/x86/arch/elf.h moved to include/arch/x86/archelf.h, as elf.h already exists in include/ and we must prevent a name clash. Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@314 f3766cd6-281f-0410-b1cd-43a5c92072e9
104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/*
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* This file is part of the LinuxBIOS project.
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*
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* It was taken from kexec-tools 1.101.
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*
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* Copyright (C) 2003,2004 Eric Biederman <ebiederm@xmission.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <types.h>
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#include <ip_checksum.h>
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#include <string.h>
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unsigned long compute_ip_checksum(void *addr, unsigned long length)
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{
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u16 *ptr;
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unsigned long sum;
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unsigned long len;
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unsigned long laddr;
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/* compute an ip style checksum */
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laddr = (unsigned long )addr;
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sum = 0;
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if (laddr & 1) {
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u16 buffer;
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unsigned char *ptr;
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/* copy the first byte into a 2 byte buffer.
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* This way automatically handles the endian question
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* of which byte (low or high) the last byte goes in.
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*/
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buffer = 0;
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ptr = addr;
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memcpy(&buffer, ptr, 1);
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sum += buffer;
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if (sum > 0xFFFF)
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sum -= 0xFFFF;
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length -= 1;
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addr = ptr +1;
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}
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len = length >> 1;
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ptr = addr;
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while (len--) {
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sum += *(ptr++);
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if (sum > 0xFFFF)
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sum -= 0xFFFF;
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}
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addr = ptr;
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if (length & 1) {
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u16 buffer;
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unsigned char *ptr;
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/* copy the last byte into a 2 byte buffer.
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* This way automatically handles the endian question
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* of which byte (low or high) the last byte goes in.
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*/
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buffer = 0;
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ptr = addr;
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memcpy(&buffer, ptr, 1);
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sum += buffer;
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if (sum > 0xFFFF)
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sum -= 0xFFFF;
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}
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return (~sum) & 0xFFFF;
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}
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unsigned long add_ip_checksums(unsigned long offset, unsigned long sum, unsigned long new)
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{
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unsigned long checksum;
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sum = ~sum & 0xFFFF;
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new = ~new & 0xFFFF;
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if (offset & 1) {
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/* byte swap the sum if it came from an odd offset
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* since the computation is endian independant this
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* works.
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*/
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new = ((new >> 8) & 0xff) | ((new << 8) & 0xff00);
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}
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checksum = sum + new;
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if (checksum > 0xFFFF) {
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checksum -= 0xFFFF;
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}
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return (~checksum) & 0xFFFF;
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}
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unsigned long negate_ip_checksum(unsigned long sum)
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{
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sum = ~sum & 0xFFFF;
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sum = 0xFFFF - sum;
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return ~sum & 0xFFFF;
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}
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