Fix kernel crash on high screen resolution.

Increase MAX_SCREEN_WIDTH=3840 and MAX_SCREEN_HEIGHT=2160.
Replace hardcoded numbers with macros, add runtime checks.

git-svn-id: svn://kolibrios.org@7522 a494cfbc-eb01-0410-851d-a64ba20cac60

kernel/trunk/const.inc

@@ -733,6 +733,9 @@ virtual at OS_BASE + BOOT_VARS
         BOOT boot_data
 end virtual
 
+MAX_SCREEN_WIDTH  = 3840
+MAX_SCREEN_HEIGHT = 2160
+
 struct  display_t
         x               dd ?
         y               dd ?

kernel/trunk/data32.inc

@@ -341,8 +341,8 @@ fpu_data:
 fpu_data_size = $ - fpu_data
 draw_data:
         rb  32*256
-BPSLine_calc_area   rd  1440
-d_width_calc_area   rd  1140
+BPSLine_calc_area   rd  MAX_SCREEN_HEIGHT
+d_width_calc_area   rd  MAX_SCREEN_HEIGHT
 mouseunder          rd  16*24
 
 mem_block_list      rd  64*2

kernel/trunk/video/framebuffer.inc

@@ -45,6 +45,8 @@ init_video:
         mov     [_display.vrefresh], 60
 
         movzx   eax, word [BOOT.x_res]; X max
+        cmp     eax, MAX_SCREEN_WIDTH
+        ja      $
         mov     [_display.width], eax
         mov     [ebp+FRB.width], eax
         mov     [display_width_standard], eax
@@ -52,6 +54,8 @@ init_video:
         mov     [screen_workarea.right], eax
 
         movzx   eax, word [BOOT.y_res]; Y max
+        cmp     eax, MAX_SCREEN_HEIGHT
+        ja      $
         mov     [_display.height], eax
         mov     [ebp+FRB.height], eax
         mov     [display_height_standard], eax

kernel/trunk/video/vesa20.inc

@@ -21,8 +21,8 @@ $Revision$
 
 uglobal
 align 4
-        bgr_cur_line    rd 1920         ; maximum width of screen
-        bgr_next_line   rd 1920
+        bgr_cur_line    rd MAX_SCREEN_WIDTH
+        bgr_next_line   rd MAX_SCREEN_WIDTH
 endg
 
 iglobal