LCOV - code coverage report
Current view: top level - lib - check_signature.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 5 0.0 %
Date: 2022-03-28 16:04:14 Functions: 0 1 0.0 %
Branches: 0 4 0.0 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0
       2                 :            : #include <linux/io.h>
       3                 :            : #include <linux/export.h>
       4                 :            : 
       5                 :            : /**
       6                 :            :  *      check_signature         -       find BIOS signatures
       7                 :            :  *      @io_addr: mmio address to check
       8                 :            :  *      @signature:  signature block
       9                 :            :  *      @length: length of signature
      10                 :            :  *
      11                 :            :  *      Perform a signature comparison with the mmio address io_addr. This
      12                 :            :  *      address should have been obtained by ioremap.
      13                 :            :  *      Returns 1 on a match.
      14                 :            :  */
      15                 :            : 
      16                 :          0 : int check_signature(const volatile void __iomem *io_addr,
      17                 :            :                         const unsigned char *signature, int length)
      18                 :            : {
      19         [ #  # ]:          0 :         while (length--) {
      20         [ #  # ]:          0 :                 if (readb(io_addr) != *signature)
      21                 :            :                         return 0;
      22                 :          0 :                 io_addr++;
      23                 :          0 :                 signature++;
      24                 :            :         }
      25                 :            :         return 1;
      26                 :            : }
      27                 :            : EXPORT_SYMBOL(check_signature);

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