blob: 5ac9b527a97cb2a28a1abd53b74a5afc26ca131c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/*******************************************************************************
*
* FUNCTION: acpi_tb_checksum
*
* PARAMETERS: Buffer - Pointer to memory region to be checked
* Length - Length of this memory region
*
* RETURN: Checksum (u8)
*
* DESCRIPTION: Calculates circular checksum of memory region.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
******************************************************************************/
/* stolen from xen/drivers/acpi/tables/tbutils.c */
#include <inttypes.h>
#include "xc_dom_ia64_util.h"
#include <xen/acpi.h>
#include <acpi/actables.h>
u8 acpi_tb_checksum(u8 * buffer, acpi_native_uint length)
{
u8 sum = 0;
u8 *end = buffer + length;
while (buffer < end) {
sum = (u8) (sum + *(buffer++));
}
return sum;
}
|
