u-boot/lib/tables_csum.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
 */

#include <linux/types.h>

u8 table_compute_checksum(const void *v, const int len)
{
	const u8 *bytes = v;
	u8 checksum = 0;
	int i;

	for (i = 0; i < len; i++)
		checksum -= bytes[i];

	return checksum;
}
SPDX: Convert all of our single license tags to Linux Kernel style When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com> 2018-05-06 21:58:06 +00:00			`// SPDX-License-Identifier: GPL-2.0+`
x86: Move table csum into separate file We need the checksum function without all the other table functionality soon, so let's split it out into its own C file. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> 2016-08-18 23:23:21 +00:00			`/*`
			`* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>`
			`*/`

lib: Remove <common.h> inclusion from these files After some header file cleanups to add missing include files, remove common.h from all files in the lib directory. This primarily means just dropping the line but in a few cases we need to add in other header files now. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Rini <trini@konsulko.com> 2023-12-14 18:16:58 +00:00			`#include <linux/types.h>`
x86: Move table csum into separate file We need the checksum function without all the other table functionality soon, so let's split it out into its own C file. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> 2016-08-18 23:23:21 +00:00
lib: make table_compute_checksum() arguments const table_compute_checksum() does neither changes the content of the checksummed buffer nor the buffer length. Adding const to the definition makes the function wider usable. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> 2024-01-09 08:36:44 +00:00			`u8 table_compute_checksum(const void *v, const int len)`
x86: Move table csum into separate file We need the checksum function without all the other table functionality soon, so let's split it out into its own C file. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> 2016-08-18 23:23:21 +00:00			`{`
lib: make table_compute_checksum() arguments const table_compute_checksum() does neither changes the content of the checksummed buffer nor the buffer length. Adding const to the definition makes the function wider usable. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> 2024-01-09 08:36:44 +00:00			`const u8 *bytes = v;`
x86: Move table csum into separate file We need the checksum function without all the other table functionality soon, so let's split it out into its own C file. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> 2016-08-18 23:23:21 +00:00			`u8 checksum = 0;`
			`int i;`

			`for (i = 0; i < len; i++)`
			`checksum -= bytes[i];`

			`return checksum;`
			`}`