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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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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>
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#include <linux/module.h>
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/**
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* check_signature - find BIOS signatures
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* @io_addr: mmio address to check
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* @signature: signature block
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* @length: length of signature
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*
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* Perform a signature comparison with the mmio address io_addr. This
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* address should have been obtained by ioremap.
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* Returns 1 on a match.
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*/
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int check_signature(const volatile void __iomem *io_addr,
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const unsigned char *signature, int length)
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{
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while (length--) {
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if (readb(io_addr) != *signature)
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return 0;
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io_addr++;
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signature++;
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}
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return 1;
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}
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EXPORT_SYMBOL(check_signature);
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