com32/lib/sys/vesa/screencpy.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 #include <inttypes.h>
  29 #include <minmax.h>
  30 #include <klibc/compiler.h>
  31 #include <string.h>
  32 #include <com32.h>
  33 #include <ilog2.h>
  34 #include "vesa.h"
  35 #include "video.h"
  36
  37
  38 static struct win_info wi;
  39
  40 void __vesacon_init_copy_to_screen(void)
  41 {
  42     struct vesa_mode_info *const mi = &__vesa_info.mi;
  43     int winn;
  44
  45     if (mi->mode_attr & 0x0080) {
  46         /* Linear frame buffer */
  47
  48         wi.win_base = (char *)mi->lfb_ptr;
  49         wi.win_size = 1 << 31;  /* 2 GB, i.e. one huge window */
  50         wi.win_pos = 0;         /* Already positioned (only one position...) */
  51         wi.win_num = -1;        /* Not a window */
  52     } else {
  53         /* Paged frame buffer */
  54
  55         /* We have already tested that *one* of these is usable */
  56         if ((mi->win_attr[0] & 0x05) == 0x05 && mi->win_seg[0])
  57             winn = 0;
  58         else
  59             winn = 1;
  60
  61         wi.win_num = winn;
  62         wi.win_base = (char *)(mi->win_seg[winn] << 4);
  63         wi.win_size = mi->win_size << 10;
  64         wi.win_gshift = ilog2(mi->win_grain) + 10;
  65         wi.win_pos = -1;        /* Undefined position */
  66     }
  67 }
  68
  69 void __vesacon_copy_to_screen(size_t dst, const uint32_t * src, size_t npixels)
  70 {
  71     size_t bytes = npixels * __vesacon_bytes_per_pixel;
  72     char rowbuf[bytes + 4] __aligned(4);
  73     const uint32_t *s;
  74
  75     s = (const uint32_t *)__vesacon_format_pixels(rowbuf, src, npixels);
  76     firmware->vesa->screencpy(dst, s, bytes, &wi);
  77 }