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  1. /*
  2.  * Copyright (C) 2006 Jakub Vana
  3.  * Copyright (C) 2006 Ondrej Palkovsky
  4.  * All rights reserved.
  5.  *
  6.  * Redistribution and use in source and binary forms, with or without
  7.  * modification, are permitted provided that the following conditions
  8.  * are met:
  9.  *
  10.  * - Redistributions of source code must retain the above copyright
  11.  *   notice, this list of conditions and the following disclaimer.
  12.  * - Redistributions in binary form must reproduce the above copyright
  13.  *   notice, this list of conditions and the following disclaimer in the
  14.  *   documentation and/or other materials provided with the distribution.
  15.  * - The name of the author may not be used to endorse or promote products
  16.  *   derived from this software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28.  */
  29.  
  30. #include <stdlib.h>
  31. #include <unistd.h>
  32. #include <string.h>
  33. #include <ddi.h>
  34. #include <sysinfo.h>
  35. #include <align.h>
  36. #include <as.h>
  37. #include <ipc/fb.h>
  38. #include <ipc/ipc.h>
  39. #include <ipc/ns.h>
  40. #include <ipc/services.h>
  41. #include <kernel/errno.h>
  42. #include <async.h>
  43. #include "font-8x16.h"
  44. #include "helenos.xbm"
  45. #include "fb.h"
  46.  
  47. #define DEFAULT_BGCOLOR                0x000080
  48. #define DEFAULT_FGCOLOR                0xffff00
  49.  
  50. /***************************************************************/
  51. /* Pixel specific fuctions */
  52.  
  53. typedef void (*putpixel_fn_t)(unsigned int x, unsigned int y, int color);
  54. typedef int (*getpixel_fn_t)(unsigned int x, unsigned int y);
  55.  
  56. struct {
  57.     __u8 *fbaddress ;
  58.  
  59.     unsigned int xres ;
  60.     unsigned int yres ;
  61.     unsigned int scanline ;
  62.     unsigned int pixelbytes ;
  63.  
  64.     putpixel_fn_t putpixel;
  65.     getpixel_fn_t getpixel;
  66. } screen;
  67.  
  68. typedef struct {
  69.     int initialized;
  70.     unsigned int x, y;
  71.     unsigned int width, height;
  72.  
  73.     /* Text support in window */
  74.     unsigned int rows, cols;
  75.     /* Style for text printing */
  76.     int bgcolor, fgcolor;
  77.     /* Auto-cursor position */
  78.     int cursor_active, cur_col, cur_row;
  79. } viewport_t;
  80.  
  81. #define MAX_VIEWPORTS 128
  82. static viewport_t viewports[128];
  83.  
  84. /* Allow only 1 connection */
  85. static int client_connected = 0;
  86.  
  87. #define RED(x, bits)    ((x >> (16 + 8 - bits)) & ((1 << bits) - 1))
  88. #define GREEN(x, bits)  ((x >> (8 + 8 - bits)) & ((1 << bits) - 1))
  89. #define BLUE(x, bits)   ((x >> (8 - bits)) & ((1 << bits) - 1))
  90.  
  91. #define COL_WIDTH   8
  92. #define ROW_BYTES   (screen.scanline * FONT_SCANLINES)
  93.  
  94. #define POINTPOS(x, y)  ((y) * screen.scanline + (x) * screen.pixelbytes)
  95.  
  96. /** Put pixel - 24-bit depth, 1 free byte */
  97. static void putpixel_4byte(unsigned int x, unsigned int y, int color)
  98. {
  99.     *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) = color;
  100. }
  101.  
  102. /** Return pixel color - 24-bit depth, 1 free byte */
  103. static int getpixel_4byte(unsigned int x, unsigned int y)
  104. {
  105.     return *((__u32 *)(screen.fbaddress + POINTPOS(x, y))) & 0xffffff;
  106. }
  107.  
  108. /** Put pixel - 24-bit depth */
  109. static void putpixel_3byte(unsigned int x, unsigned int y, int color)
  110. {
  111.     unsigned int startbyte = POINTPOS(x, y);
  112.  
  113. #if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
  114.     screen.fbaddress[startbyte] = RED(color, 8);
  115.     screen.fbaddress[startbyte + 1] = GREEN(color, 8);
  116.     screen.fbaddress[startbyte + 2] = BLUE(color, 8);
  117. #else
  118.     screen.fbaddress[startbyte + 2] = RED(color, 8);
  119.     screen.fbaddress[startbyte + 1] = GREEN(color, 8);
  120.     screen.fbaddress[startbyte + 0] = BLUE(color, 8);
  121. #endif
  122.  
  123. }
  124.  
  125. /** Return pixel color - 24-bit depth */
  126. static int getpixel_3byte(unsigned int x, unsigned int y)
  127. {
  128.     unsigned int startbyte = POINTPOS(x, y);
  129.  
  130.  
  131.  
  132. #if (defined(BIG_ENDIAN) || defined(FB_BIG_ENDIAN))
  133.     return screen.fbaddress[startbyte] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 2];
  134. #else
  135.     return screen.fbaddress[startbyte + 2] << 16 | screen.fbaddress[startbyte + 1] << 8 | screen.fbaddress[startbyte + 0];
  136. #endif
  137.                                
  138.  
  139. }
  140.  
  141. /** Put pixel - 16-bit depth (5:6:5) */
  142. static void putpixel_2byte(unsigned int x, unsigned int y, int color)
  143. {
  144.     /* 5-bit, 6-bits, 5-bits */
  145.     *((__u16 *)(screen.fbaddress + POINTPOS(x, y))) = RED(color, 5) << 11 | GREEN(color, 6) << 5 | BLUE(color, 5);
  146. }
  147.  
  148. /** Return pixel color - 16-bit depth (5:6:5) */
  149. static int getpixel_2byte(unsigned int x, unsigned int y)
  150. {
  151.     int color = *((__u16 *)(screen.fbaddress + POINTPOS(x, y)));
  152.     return (((color >> 11) & 0x1f) << (16 + 3)) | (((color >> 5) & 0x3f) << (8 + 2)) | ((color & 0x1f) << 3);
  153. }
  154.  
  155. /** Put pixel - 8-bit depth (3:2:3) */
  156. static void putpixel_1byte(unsigned int x, unsigned int y, int color)
  157. {
  158.     screen.fbaddress[POINTPOS(x, y)] = RED(color, 3) << 5 | GREEN(color, 2) << 3 | BLUE(color, 3);
  159. }
  160.  
  161. /** Return pixel color - 8-bit depth (3:2:3) */
  162. static int getpixel_1byte(unsigned int x, unsigned int y)
  163. {
  164.     int color = screen.fbaddress[POINTPOS(x, y)];
  165.     return (((color >> 5) & 0x7) << (16 + 5)) | (((color >> 3) & 0x3) << (8 + 6)) | ((color & 0x7) << 5);
  166. }
  167.  
  168. /** Put pixel into viewport
  169.  *
  170.  * @param vp Viewport identification
  171.  * @param x X coord relative to viewport
  172.  * @param y Y coord relative to viewport
  173.  * @param color RGB color
  174.  */
  175. static void putpixel(int vp, unsigned int x, unsigned int y, int color)
  176. {
  177.     screen.putpixel(viewports[vp].x + x, viewports[vp].y + y, color);
  178. }
  179. /** Get pixel from viewport */
  180. static int getpixel(int vp, unsigned int x, unsigned int y)
  181. {
  182.     return screen.getpixel(viewports[vp].x + x, viewports[vp].y + y);
  183. }
  184.  
  185. /** Fill line with color BGCOLOR */
  186. static void clear_line(int vp, unsigned int y)
  187. {
  188.     unsigned int x;
  189.     for (x = 0; x < viewports[vp].width; x++)
  190.         putpixel(vp, x, y, viewports[vp].bgcolor);
  191. }
  192.  
  193. /** Fill viewport with background color */
  194. static void clear_port(int vp)
  195. {
  196.     unsigned int y;
  197.  
  198.     clear_line(vp, 0);
  199.     for (y = viewports[vp].y+1; y < viewports[vp].y+viewports[vp].height; y++) {
  200.         memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
  201.                &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
  202.                screen.pixelbytes * viewports[vp].width);
  203.     }  
  204. }
  205.  
  206. /** Scroll port up/down
  207.  *
  208.  * @param vp Viewport to scroll
  209.  * @param rows Positive number - scroll up, negative - scroll down
  210.  */
  211. static void scroll_port(int vp, int rows)
  212. {
  213.     int y;
  214.     int startline;
  215.     int endline;
  216.    
  217.     if (rows > 0) {
  218.         for (y=viewports[vp].y; y < viewports[vp].y+viewports[vp].height - rows*FONT_SCANLINES; y++)
  219.             memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
  220.                    &screen.fbaddress[POINTPOS(viewports[vp].x,y + rows*FONT_SCANLINES)],
  221.                    screen.pixelbytes * viewports[vp].width);
  222.         /* Clear last row */
  223.         startline = viewports[vp].y+FONT_SCANLINES*(viewports[vp].rows-1);
  224.         endline = viewports[vp].y + viewports[vp].height;
  225.         clear_line(vp, startline);
  226.         for (y=startline+1;y < endline; y++)
  227.             memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
  228.                    &screen.fbaddress[POINTPOS(viewports[vp].x,startline)],
  229.                    screen.pixelbytes * viewports[vp].width);
  230.                  
  231.     } else if (rows < 0) {
  232.         rows = -rows;
  233.         for (y=viewports[vp].y + viewports[vp].height-1; y >= viewports[vp].y + rows*FONT_SCANLINES; y--)
  234.             memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,y)],
  235.                 &screen.fbaddress[POINTPOS(viewports[vp].x,y - rows*FONT_SCANLINES)],
  236.                 screen.pixelbytes * viewports[vp].width);
  237.         /* Clear first row */
  238.         clear_line(0, viewports[vp].bgcolor);
  239.         for (y=1;y < rows*FONT_SCANLINES; y++)
  240.             memcpy(&screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y+y)],
  241.                    &screen.fbaddress[POINTPOS(viewports[vp].x,viewports[vp].y)],
  242.                    screen.pixelbytes * viewports[vp].width);
  243.     }
  244. }
  245.  
  246. static void invert_pixel(int vp,unsigned int x, unsigned int y)
  247. {
  248.     putpixel(vp, x, y, ~getpixel(vp, x, y));
  249. }
  250.  
  251.  
  252. /** Draw one line of glyph at a given position */
  253. static void draw_glyph_line(int vp,unsigned int glline, unsigned int x, unsigned int y)
  254. {
  255.     unsigned int i;
  256.  
  257.     for (i = 0; i < 8; i++)
  258.         if (glline & (1 << (7 - i))) {
  259.             putpixel(vp, x + i, y, viewports[vp].fgcolor);
  260.         } else
  261.             putpixel(vp, x + i, y, viewports[vp].bgcolor);
  262. }
  263.  
  264. /***************************************************************/
  265. /* Character-console functions */
  266.  
  267. /** Draw character at given position */
  268. static void draw_glyph(int vp,__u8 glyph, unsigned int sx, unsigned int sy)
  269. {
  270.     unsigned int y;
  271.  
  272.     for (y = 0; y < FONT_SCANLINES; y++)
  273.         draw_glyph_line(vp ,fb_font[glyph * FONT_SCANLINES + y], sx, sy + y);
  274. }
  275.  
  276. /** Invert character at given position */
  277. static void invert_char(int vp,unsigned int row, unsigned int col)
  278. {
  279.     unsigned int x;
  280.     unsigned int y;
  281.  
  282.     for (x = 0; x < COL_WIDTH; x++)
  283.         for (y = 0; y < FONT_SCANLINES; y++)
  284.             invert_pixel(vp, col * COL_WIDTH + x, row * FONT_SCANLINES + y);
  285. }
  286.  
  287. static void draw_logo(int vp,unsigned int startx, unsigned int starty)
  288. {
  289.     unsigned int x;
  290.     unsigned int y;
  291.     unsigned int byte;
  292.     unsigned int rowbytes;
  293.  
  294.     rowbytes = (helenos_width - 1) / 8 + 1;
  295.  
  296.     for (y = 0; y < helenos_height; y++)
  297.         for (x = 0; x < helenos_width; x++) {
  298.             byte = helenos_bits[rowbytes * y + x / 8];
  299.             byte >>= x % 8;
  300.             if (byte & 1)
  301.                 putpixel(vp ,startx + x, starty + y, viewports[vp].fgcolor);
  302.         }
  303. }
  304.  
  305. /***************************************************************/
  306. /* Stdout specific functions */
  307.  
  308.  
  309. /** Create new viewport
  310.  *
  311.  * @return New viewport number
  312.  */
  313. static int viewport_create(unsigned int x, unsigned int y,unsigned int width,
  314.                unsigned int height)
  315. {
  316.     int i;
  317.  
  318. for (i=0; i < MAX_VIEWPORTS; i++) {
  319.         if (!viewports[i].initialized)
  320.             break;
  321.     }
  322.     if (i == MAX_VIEWPORTS)
  323.         return ELIMIT;
  324.  
  325.     if (width ==0 || height == 0 ||
  326.         x+width > screen.xres || y+height > screen.yres)
  327.         return EINVAL;
  328.     if (width < FONT_SCANLINES || height < COL_WIDTH)
  329.         return EINVAL;
  330.  
  331.     viewports[i].x = x;
  332.     viewports[i].y = y;
  333.     viewports[i].width = width;
  334.     viewports[i].height = height;
  335.    
  336.     viewports[i].rows = height / FONT_SCANLINES;
  337.     viewports[i].cols = width / COL_WIDTH;
  338.  
  339.     viewports[i].bgcolor = DEFAULT_BGCOLOR;
  340.     viewports[i].fgcolor = DEFAULT_FGCOLOR;
  341.    
  342.     viewports[i].cur_col = 0;
  343.     viewports[i].cur_row = 0;
  344.     viewports[i].cursor_active = 0;
  345.  
  346.     viewports[i].initialized = 1;
  347.  
  348.     return i;
  349. }
  350.  
  351.  
  352. /** Initialize framebuffer as a chardev output device
  353.  *
  354.  * @param addr Address of theframebuffer
  355.  * @param x    Screen width in pixels
  356.  * @param y    Screen height in pixels
  357.  * @param bpp  Bits per pixel (8, 16, 24, 32)
  358.  * @param scan Bytes per one scanline
  359.  *
  360.  */
  361. static void screen_init(__address addr, unsigned int xres, unsigned int yres, unsigned int bpp, unsigned int scan)
  362. {
  363.     switch (bpp) {
  364.         case 8:
  365.             screen.putpixel = putpixel_1byte;
  366.             screen.getpixel = getpixel_1byte;
  367.             screen.pixelbytes = 1;
  368.             break;
  369.         case 16:
  370.             screen.putpixel = putpixel_2byte;
  371.             screen.getpixel = getpixel_2byte;
  372.             screen.pixelbytes = 2;
  373.             break;
  374.         case 24:
  375.             screen.putpixel = putpixel_3byte;
  376.             screen.getpixel = getpixel_3byte;
  377.             screen.pixelbytes = 3;
  378.             break;
  379.         case 32:
  380.             screen.putpixel = putpixel_4byte;
  381.             screen.getpixel = getpixel_4byte;
  382.             screen.pixelbytes = 4;
  383.             break;
  384.     }
  385.  
  386.        
  387.     screen.fbaddress = (unsigned char *) addr;
  388.     screen.xres = xres;
  389.     screen.yres = yres;
  390.     screen.scanline = scan;
  391.    
  392.     /* Create first viewport */
  393.     viewport_create(0,0,xres,yres);
  394.  
  395.     clear_port(0);
  396. }
  397.  
  398. /** Draw character at given position relative to viewport
  399.  *
  400.  * @param vp Viewport identification
  401.  * @param c Character to print
  402.  * @param row Screen position relative to viewport
  403.  * @param col Screen position relative to viewport
  404.  */
  405. static void draw_char(int vp, char c, unsigned int row, unsigned int col)
  406. {
  407.     viewport_t *vport = &viewports[vp];
  408.  
  409.     if (vport->cursor_active && (vport->cur_col != col || vport->cur_row != row))
  410.         invert_char(vp, vport->cur_row, vport->cur_col);
  411.    
  412.     draw_glyph(vp, c, col * COL_WIDTH, row * FONT_SCANLINES);
  413.  
  414.     vport->cur_col = col;
  415.     vport->cur_row = row;
  416.  
  417.     vport->cur_col++;
  418.     if (vport->cur_col>= vport->cols) {
  419.         vport->cur_col = 0;
  420.         vport->cur_row++;
  421.         if (vport->cur_row >= vport->rows)
  422.             vport->cur_row--;
  423.     }
  424.     if (vport->cursor_active)
  425.         invert_char(vp, vport->cur_row, vport->cur_col);
  426. }
  427.  
  428. /** Function for handling connections to FB
  429.  *
  430.  */
  431. static void fb_client_connection(ipc_callid_t iid, ipc_call_t *icall)
  432. {
  433.     ipc_callid_t callid;
  434.     ipc_call_t call;
  435.     int retval;
  436.     int i;
  437.     unsigned int row,col;
  438.     char c;
  439.  
  440.     int vp = 0;
  441.     viewport_t *vport = &viewports[0];
  442.  
  443.     if (client_connected) {
  444.         ipc_answer_fast(iid, ELIMIT, 0,0);
  445.         return;
  446.     }
  447.     client_connected = 1;
  448.     ipc_answer_fast(iid, 0, 0, 0); /* Accept connection */
  449.  
  450.     while (1) {
  451.         callid = async_get_call(&call);
  452.         switch (IPC_GET_METHOD(call)) {
  453.         case IPC_M_PHONE_HUNGUP:
  454.             client_connected = 0;
  455.             /* cleanup other viewports */
  456.             for (i=1; i < MAX_VIEWPORTS; i++)
  457.                 vport->initialized = 0;
  458.             ipc_answer_fast(callid,0,0,0);
  459.             return; /* Exit thread */
  460.         case FB_PUTCHAR:
  461.             c = IPC_GET_ARG1(call);
  462.             row = IPC_GET_ARG2(call);
  463.             col = IPC_GET_ARG3(call);
  464.             if (row >= vport->rows || col >= vport->cols) {
  465.                 retval = EINVAL;
  466.                 break;
  467.             }
  468.             ipc_answer_fast(callid,0,0,0);
  469.  
  470.             draw_char(vp, c, row, col);
  471.             continue; /* msg already answered */
  472.         case FB_CLEAR:
  473.             clear_port(vp);
  474.             if (vport->cursor_active)
  475.                 invert_char(vp, vport->cur_row, vport->cur_col);
  476.             retval = 0;
  477.             break;
  478.         case FB_CURSOR_GOTO:
  479.             row = IPC_GET_ARG1(call);
  480.             col = IPC_GET_ARG2(call);
  481.             if (row >= vport->rows || col >= vport->cols) {
  482.                 retval = EINVAL;
  483.                 break;
  484.             }
  485.             retval = 0;
  486.             if (viewports[vp].cursor_active) {
  487.                 invert_char(vp, vport->cur_row, vport->cur_col);
  488.                 invert_char(vp, row, col);
  489.             }
  490.             vport->cur_col = col;
  491.             vport->cur_row = row;
  492.             break;
  493.         case FB_CURSOR_VISIBILITY:
  494.             i = IPC_GET_ARG1(call);
  495.             retval = 0;
  496.             if ((i && vport->cursor_active) || (!i && !vport->cursor_active))
  497.                 break;
  498.  
  499.             vport->cursor_active = i;
  500.             invert_char(vp, vport->cur_row, vport->cur_col);
  501.             break;
  502.         case FB_GET_CSIZE:
  503.             ipc_answer_fast(callid, 0, vport->rows, vport->cols);
  504.             continue;
  505.         case FB_SCROLL:
  506.             i = IPC_GET_ARG1(call);
  507.             if (i > vport->rows || i < (- (int)vport->rows)) {
  508.                 retval = EINVAL;
  509.                 break;
  510.             }
  511.             if (vport->cursor_active)
  512.                 invert_char(vp, vport->cur_row, vport->cur_col);
  513.             scroll_port(vp, i);
  514.             if (vport->cursor_active)
  515.                 invert_char(vp, vport->cur_row, vport->cur_col);
  516.             retval = 0;
  517.             break;
  518.         case FB_VIEWPORT_SWITCH:
  519.             i = IPC_GET_ARG1(call);
  520.             if (i < 0 || i >= MAX_VIEWPORTS) {
  521.                 retval = EINVAL;
  522.                 break;
  523.             }
  524.             if (! viewports[i].initialized ) {
  525.                 retval = EADDRNOTAVAIL;
  526.                 break;
  527.             }
  528.             vp = i;
  529.             vport = &viewports[vp];
  530.             retval = 0;
  531.             break;
  532.         case FB_VIEWPORT_CREATE:
  533.             retval = viewport_create(IPC_GET_ARG1(call) >> 16,
  534.                          IPC_GET_ARG1(call) & 0xffff,
  535.                          IPC_GET_ARG2(call) >> 16,
  536.                          IPC_GET_ARG2(call) & 0xffff);
  537.             break;
  538.         case FB_VIEWPORT_DELETE:
  539.             i = IPC_GET_ARG1(call);
  540.             if (i < 0 || i >= MAX_VIEWPORTS) {
  541.                 retval = EINVAL;
  542.                 break;
  543.             }
  544.             if (! viewports[i].initialized ) {
  545.                 retval = EADDRNOTAVAIL;
  546.                 break;
  547.             }
  548.             viewports[i].initialized = 0;
  549.             retval = 0;
  550.             break;
  551.         case FB_SET_STYLE:
  552.             vport->fgcolor = IPC_GET_ARG1(call);
  553.             vport->bgcolor = IPC_GET_ARG2(call);
  554.             retval = 0;
  555.             break;
  556.         case FB_GET_RESOLUTION:
  557.             ipc_answer_fast(callid, 0, screen.xres,screen.yres);
  558.             continue;
  559.         default:
  560.             retval = ENOENT;
  561.         }
  562.         ipc_answer_fast(callid,retval,0,0);
  563.     }
  564. }
  565.  
  566. /** Initialization of framebuffer */
  567. int fb_init(void)
  568. {
  569.     __address fb_ph_addr;
  570.     unsigned int fb_width;
  571.     unsigned int fb_height;
  572.     unsigned int fb_bpp;
  573.     unsigned int fb_scanline;
  574.     __address fb_addr;
  575.  
  576.     async_set_client_connection(fb_client_connection);
  577.  
  578.     fb_ph_addr=sysinfo_value("fb.address.physical");
  579.     fb_width=sysinfo_value("fb.width");
  580.     fb_height=sysinfo_value("fb.height");
  581.     fb_bpp=sysinfo_value("fb.bpp");
  582.     fb_scanline=sysinfo_value("fb.scanline");
  583.  
  584.     fb_addr=ALIGN_UP(((__address)set_maxheapsize(USER_ADDRESS_SPACE_SIZE_ARCH>>1)),PAGE_SIZE);
  585.    
  586.     map_physmem((void *)((__address)fb_ph_addr),(void *)fb_addr,
  587.             (fb_scanline*fb_height+PAGE_SIZE-1)>>PAGE_WIDTH,
  588.             AS_AREA_READ | AS_AREA_WRITE | AS_AREA_CACHEABLE);
  589.    
  590.     screen_init(fb_addr, fb_width, fb_height, fb_bpp, fb_scanline);
  591.  
  592.     return 0;
  593. }
  594.  
  595.