arch/x86_64-pc/kernel/kernel_debug.c

   1 /*
   2     Copyright © 1995-2014, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <bootconsole.h>
   7
   8 #include "kernel_base.h"
   9 #include "kernel_debug.h"
  10 #include "kernel_intern.h"
  11
  12 #define __save_flags(x)         __asm__ __volatile__("pushfq ; popq %0":"=g" (x): /* no input */)
  13 #define __restore_flags(x)      __asm__ __volatile__("pushq %0 ; popfq": /* no output */ :"g" (x):"memory", "cc")
  14 #define __cli()                 __asm__ __volatile__("cli": : :"memory")
  15 #define __sti()                 __asm__ __volatile__("sti": : :"memory")
  16
  17 int krnPutC(int c, struct KernelBase *KernelBase)
  18 {
  19     unsigned long flags;
  20
  21     __save_flags(flags);
  22
  23     /*
  24      * stegerg: Don't use Disable/Enable, because we want  interrupt enabled flag
  25      * to stay the same as it was before the Disable() call
  26      */
  27     __cli();
  28
  29     /*
  30      * If we got 0x03, this means graphics driver wants to take over the screen.
  31      * If VESA hack is activated, it will use only upper half of the screen
  32      * because y resolution was adjusted.
  33      * In our turn, we need to switch over to lower half.
  34      * VESA hack is supported only on graphical console of course. And do not
  35      * expect it to work with native mode video driver. :)
  36      */
  37     if ((c == 0x03) && (scr_Type == SCR_GFX) && __KernBootPrivate->debug_framebuffer)
  38     {
  39         /* Reinitialize boot console with decreased height */
  40         scr_FrameBuffer = __KernBootPrivate->debug_framebuffer;
  41         fb_Resize(__KernBootPrivate->debug_y_resolution);
  42     }
  43     else
  44         con_Putc(c);
  45
  46     /*
  47      * Interrupt flag is stored in flags - if it was enabled before,
  48      * it will be renabled when the flags are restored
  49      */
  50     __restore_flags(flags);
  51
  52     return 1;
  53 }