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  1. /*
  2.  * Copyright (C) 2006-2006 Jakub Vana
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifdef CONFIG_FB
  30.  
  31. #include <genarch/fb/fb.h>
  32. #include <arch/vesa.h>
  33. #include <putchar.h>
  34. #include <mm/page.h>
  35. #include <mm/frame.h>
  36. #include <mm/as.h>
  37. #include <arch/mm/page.h>
  38. #include <synch/spinlock.h>
  39. #include <arch/types.h>
  40. #include <arch/asm.h>
  41. #include <memstr.h>
  42.  
  43. __u32 vesa_ph_addr;
  44. __u16 vesa_width;
  45. __u16 vesa_height;
  46. __u16 vesa_bpp;
  47. __u16 vesa_scanline;
  48.  
  49.  
  50. int vesa_present(void)
  51. {
  52.     if(vesa_width!=0xffff) return true;
  53.     if(vesa_height!=0xffff) return true;
  54.     return false;
  55. }
  56.  
  57.  
  58. static __u32 log2(__u32 x)
  59. {
  60.     __u32 l=2;
  61.     if(x<=PAGE_SIZE) return PAGE_WIDTH+1;
  62.    
  63.     x--;
  64.     while(x>>=1) l++;
  65.     return l;
  66. }
  67.  
  68. void vesa_init(void)
  69. {
  70.     int a;
  71.  
  72.     __address videoram_lin_addr;
  73.  
  74.     videoram_lin_addr=PA2KA(PFN2ADDR(frame_alloc( log2(vesa_scanline*vesa_height) -FRAME_WIDTH,FRAME_KA)));
  75.     /* Map videoram */
  76.     for(a=0;a<((vesa_scanline*vesa_height+PAGE_SIZE-1)>>PAGE_WIDTH);a++)
  77.     page_mapping_insert(AS_KERNEL, videoram_lin_addr+a*4096, vesa_ph_addr+a*4096, PAGE_NOT_CACHEABLE);
  78.    
  79.     fb_init( videoram_lin_addr,vesa_width,vesa_height,vesa_bpp,vesa_scanline);
  80.     putchar('\n');
  81. }
  82.  
  83. #endif
  84.  
  85.