src/arch/i386/include/biosint.h

   1 #ifndef BIOSINT_H
   2 #define BIOSINT_H
   3
   4 /**
   5  * @file BIOS interrupts
   6  *
   7  */
   8
   9 FILE_LICENCE ( GPL2_OR_LATER );
  10
  11 #include <realmode.h>
  12
  13 struct segoff;
  14
  15 /**
  16  * Hooked interrupt count
  17  *
  18  * At exit, after unhooking all possible interrupts, this counter
  19  * should be examined.  If it is non-zero, it means that we failed to
  20  * unhook at least one interrupt vector, and so must not free up the
  21  * memory we are using.  (Note that this also implies that we should
  22  * re-hook INT 15 in order to hide ourselves from the memory map).
  23  */
  24 extern uint16_t __text16 ( hooked_bios_interrupts );
  25 #define hooked_bios_interrupts __use_text16 ( hooked_bios_interrupts )
  26
  27 extern void hook_bios_interrupt ( unsigned int interrupt, unsigned int handler,
  28                                   struct segoff *chain_vector );
  29 extern int unhook_bios_interrupt ( unsigned int interrupt,
  30                                    unsigned int handler,
  31                                    struct segoff *chain_vector );
  32
  33 #endif /* BIOSINT_H */