source: mainline/kernel/arch/ia32/src/drivers/vesa.c@ f1a2c6e

/*
 * Copyright (c) 2006 Jakub Vana
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup ia32
 * @{
 */
/**
 * @file
 * @brief VESA frame buffer driver.
 */

#ifdef CONFIG_FB

#include <genarch/fb/fb.h>
#include <genarch/fb/visuals.h>
#include <arch/drivers/vesa.h>
#include <console/chardev.h>
#include <console/console.h>
#include <putchar.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <mm/as.h>
#include <arch/mm/page.h>
#include <synch/spinlock.h>
#include <arch/asm.h>
#include <arch/types.h>
#include <memstr.h>
#include <bitops.h>

uint32_t vesa_ph_addr;
uint16_t vesa_width;
uint16_t vesa_height;
uint16_t vesa_bpp;
uint16_t vesa_scanline;

uint8_t vesa_red_mask;
uint8_t vesa_red_pos;

uint8_t vesa_green_mask;
uint8_t vesa_green_pos;

uint8_t vesa_blue_mask;
uint8_t vesa_blue_pos;

bool vesa_init(void)
{
        if ((vesa_width == 0xffff) || (vesa_height == 0xffff))
                return false;
        
        visual_t visual;
        
        switch (vesa_bpp) {
        case 8:
                visual = VISUAL_INDIRECT_8;
                break;
        case 16:
                if ((vesa_red_mask == 5) && (vesa_red_pos == 10)
                    && (vesa_green_mask == 5) && (vesa_green_pos == 5)
                    && (vesa_blue_mask == 5) && (vesa_blue_pos == 0))
                        visual = VISUAL_RGB_5_5_5_LE;
                else
                        visual = VISUAL_RGB_5_6_5_LE;
                break;
        case 24:
                visual = VISUAL_BGR_8_8_8;
                break;
        case 32:
                visual = VISUAL_BGR_8_8_8_0;
                break;
        default:
                LOG("Unsupported bits per pixel.");
                return false;
        }
        
        fb_properties_t vesa_props = {
                .addr = vesa_ph_addr,
                .offset = 0,
                .x = vesa_width,
                .y = vesa_height,
                .scan = vesa_scanline,
                .visual = visual,
        };
        
        outdev_t *fbdev = fb_init(&vesa_props);
        if (!fbdev)
                return false;
        
        stdout_wire(fbdev);
        return true;
}

#endif

/** @}
 */