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27 lines
635 B
27 lines
635 B
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/io.h> |
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#include <linux/export.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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