loader/i386/pc/xnu.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2009  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/env.h>
  20 #include <grub/misc.h>
  21 #include <grub/xnu.h>
  22 #include <grub/mm.h>
  23 #include <grub/cpu/xnu.h>
  24 #include <grub/machine/vbe.h>
  25 #include <grub/machine/vga.h>
  26
  27 #define min(a,b) (((a) < (b)) ? (a) : (b))
  28 #define max(a,b) (((a) > (b)) ? (a) : (b))
  29
  30 #define DEFAULT_VIDEO_MODE "1024x768x32,800x600x32,640x480x32"
  31
  32 static int NESTED_FUNC_ATTR video_hook (grub_video_adapter_t p __attribute__ ((unused)),
  33                                         struct grub_video_mode_info *info)
  34 {
  35   if (info->mode_type & GRUB_VIDEO_MODE_TYPE_PURE_TEXT)
  36     return 0;
  37
  38   return 1;
  39 }
  40
  41 /* Setup video for xnu. */
  42 grub_err_t
  43 grub_xnu_set_video (struct grub_xnu_boot_params *params)
  44 {
  45   struct grub_video_mode_info mode_info;
  46   struct grub_video_render_target *render_target;
  47   int ret;
  48   int x,y;
  49   char *tmp, *modevar;
  50   grub_err_t err;
  51
  52   modevar = grub_env_get ("gfxpayload");
  53   if (! modevar || *modevar == 0)
  54     err = grub_video_set_mode (DEFAULT_VIDEO_MODE, video_hook);
  55   else
  56     {
  57       tmp = grub_malloc (grub_strlen (modevar)
  58                          + sizeof (DEFAULT_VIDEO_MODE) + 1);
  59       if (! tmp)
  60         return grub_error (GRUB_ERR_OUT_OF_MEMORY,
  61                            "couldn't allocate temporary storag");
  62       grub_sprintf (tmp, "%s;" DEFAULT_VIDEO_MODE, modevar);
  63       err = grub_video_set_mode (tmp, video_hook);
  64       grub_free (tmp);
  65     }
  66
  67   if (err)
  68     return err;
  69
  70   ret = grub_video_get_info (&mode_info);
  71   if (ret)
  72     return grub_error (GRUB_ERR_IO, "couldn't retrieve video parameters");
  73
  74   ret = grub_video_get_active_render_target (&render_target);
  75   if (ret)
  76     return grub_error (GRUB_ERR_IO, "couldn't retrieve video parameters");
  77
  78   err = GRUB_ERR_NONE;
  79   x = mode_info.width - grub_xnu_bitmap->mode_info.width;
  80   x /= 2;
  81   y = mode_info.height - grub_xnu_bitmap->mode_info.height;
  82   y /= 2;
  83   err = grub_video_blit_bitmap (grub_xnu_bitmap,
  84                                 GRUB_VIDEO_BLIT_REPLACE,
  85                                 x > 0 ? x : 0,
  86                                 y > 0 ? y : 0,
  87                                 x < 0 ? -x : 0,
  88                                 y < 0 ? -y : 0,
  89                                 min (grub_xnu_bitmap->mode_info.width,
  90                                      mode_info.width),
  91                                 min (grub_xnu_bitmap->mode_info.height,
  92                                      mode_info.height));
  93   if (err)
  94     {
  95       grub_print_error ();
  96       grub_errno = GRUB_ERR_NONE;
  97       grub_xnu_bitmap = 0;
  98     }
  99
 100   params->lfb_width = mode_info.width;
 101   params->lfb_height = mode_info.height;
 102   params->lfb_depth = mode_info.bpp;
 103   params->lfb_line_len = mode_info.pitch;
 104
 105   params->lfb_base = PTR_TO_UINT32 (render_target->data);
 106   params->lfb_mode = grub_xnu_bitmap
 107     ? GRUB_XNU_VIDEO_SPLASH : GRUB_XNU_VIDEO_TEXT_IN_VIDEO;
 108
 109   return GRUB_ERR_NONE;
 110 }
 111