threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
28 lines
635 B
C
28 lines
635 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/io.h>
|
|
#include <linux/export.h>
|
|
|
|
/**
|
|
* check_signature - find BIOS signatures
|
|
* @io_addr: mmio address to check
|
|
* @signature: signature block
|
|
* @length: length of signature
|
|
*
|
|
* Perform a signature comparison with the mmio address io_addr. This
|
|
* address should have been obtained by ioremap.
|
|
* Returns 1 on a match.
|
|
*/
|
|
|
|
int check_signature(const volatile void __iomem *io_addr,
|
|
const unsigned char *signature, int length)
|
|
{
|
|
while (length--) {
|
|
if (readb(io_addr) != *signature)
|
|
return 0;
|
|
io_addr++;
|
|
signature++;
|
|
}
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(check_signature);
|