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Linux/lib/check_signature.c

  1 #include <linux/io.h>
  2 #include <linux/export.h>
  3 
  4 /**
  5  *      check_signature         -       find BIOS signatures
  6  *      @io_addr: mmio address to check
  7  *      @signature:  signature block
  8  *      @length: length of signature
  9  *
 10  *      Perform a signature comparison with the mmio address io_addr. This
 11  *      address should have been obtained by ioremap.
 12  *      Returns 1 on a match.
 13  */
 14 
 15 int check_signature(const volatile void __iomem *io_addr,
 16                         const unsigned char *signature, int length)
 17 {
 18         while (length--) {
 19                 if (readb(io_addr) != *signature)
 20                         return 0;
 21                 io_addr++;
 22                 signature++;
 23         }
 24         return 1;
 25 }
 26 EXPORT_SYMBOL(check_signature);
 27 

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