LCOV - code coverage report
Current view: top level - arch/x86/include/asm - bios_ebda.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 4 4 100.0 %
Date: 2022-03-28 16:04:14 Functions: 0 0 -
Branches: 2 4 50.0 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _ASM_X86_BIOS_EBDA_H
       3                 :            : #define _ASM_X86_BIOS_EBDA_H
       4                 :            : 
       5                 :            : #include <asm/io.h>
       6                 :            : 
       7                 :            : /*
       8                 :            :  * Returns physical address of EBDA.  Returns 0 if there is no EBDA.
       9                 :            :  */
      10                 :         13 : static inline unsigned int get_bios_ebda(void)
      11                 :            : {
      12                 :            :         /*
      13                 :            :          * There is a real-mode segmented pointer pointing to the
      14                 :            :          * 4K EBDA area at 0x40E.
      15                 :            :          */
      16         [ -  + ]:         13 :         unsigned int address = *(unsigned short *)phys_to_virt(0x40E);
      17                 :         13 :         address <<= 4;
      18         [ -  + ]:         13 :         return address; /* 0 means none */
      19                 :            : }
      20                 :            : 
      21                 :            : void reserve_bios_regions(void);
      22                 :            : 
      23                 :            : #ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
      24                 :            : /*
      25                 :            :  * This is obviously not a great place for this, but we want to be
      26                 :            :  * able to scatter it around anywhere in the kernel.
      27                 :            :  */
      28                 :            : void check_for_bios_corruption(void);
      29                 :            : void start_periodic_check_for_corruption(void);
      30                 :            : #else
      31                 :            : static inline void check_for_bios_corruption(void)
      32                 :            : {
      33                 :            : }
      34                 :            : 
      35                 :            : static inline void start_periodic_check_for_corruption(void)
      36                 :            : {
      37                 :            : }
      38                 :            : #endif
      39                 :            : 
      40                 :            : #endif /* _ASM_X86_BIOS_EBDA_H */

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