rom/kernel/setsystemattr.c

   1 #include <kernel_base.h>
   2
   3 /*****************************************************************************
   4
   5     NAME */
   6 #include <proto/kernel.h>
   7
   8 AROS_LH2(int, KrnSetSystemAttr,
   9
  10 /*  SYNOPSIS */
  11         AROS_LHA(uint32_t, id, D0),
  12         AROS_LHA(intptr_t, val, D1),
  13
  14 /*  LOCATION */
  15         struct KernelBase *, KernelBase, 30, Kernel)
  16
  17 /*  FUNCTION
  18         Set values of internal system attributes
  19
  20     INPUTS
  21         id  - ID of the attribute to set. See KrnGetAttr() description for the
  22               list of attributes and their meaning.
  23         val - New value of the attribute
  24
  25     RESULT
  26         Zero for success and nonzero for failure (unknown or read-only attribute or
  27         bad value).
  28
  29     NOTES
  30         Kernel attributes control various aspects of kernel's low-level functions.
  31         The exact semantics of each attribute may vary from system to system.
  32         Not all systems support all attributes.
  33
  34         Please do not alter these attributes from within user software, this will
  35         not do any good things. This function is provided mainly for use by
  36         other system components which exactly know what they do.
  37
  38     EXAMPLE
  39
  40     BUGS
  41
  42     SEE ALSO
  43         KrnGetSystemAttr()
  44
  45     INTERNALS
  46
  47 ******************************************************************************/
  48 {
  49     AROS_LIBFUNC_INIT
  50
  51     switch (id)
  52     {
  53 #ifndef NO_VBLANK_EMU
  54     case KATTR_VBlankEnable:
  55         KernelBase->kb_VBlankEnable = val;
  56         break;
  57 #endif
  58
  59     default:
  60         return -1;
  61     }
  62
  63     return 0;
  64
  65     AROS_LIBFUNC_EXIT
  66 }