mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 03:33:59 +08:00
cc2ea416b2
This is a rather bizarre thing to have inlined in io.h. Stick it in lib/ instead. While we're there, despaghetti it a bit, and fix its off-by-one behaviour when passed a zero length. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
27 lines
599 B
C
27 lines
599 B
C
#include <linux/io.h>
|
|
#include <linux/module.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);
|