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//==========================================================================

//

//      gfxmode.c

//

//      Display information about the available graphics modes.

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    bartv

// Date:         2002-04-26

// Purpose:      Display information about the various graphics modes

// Description:

//

//    RedBoot on a PC has an option to switch to a suitable graphics mode

//    during bootstrap, by calling the video BIOS before switching from

//    real to protected mode. This is controlled by the option

//    CYGNUM_HAL_I386_PC_STARTUP_VIDEO_MODE in the RedBoot configuration.

//    It is then possible to download an eCos application which uses

//    the current graphics mode.

//

//    However different graphics cards will use different numbers for

//    the various resolutions, so the user must somehow find out which

//    graphics mode corresponds to which resolution and depth. That

//    can be achieved by creating another eCos configuration suitable

//    for applications, and then building this utility with that

//    configuration. RedBoot can then be reconfigured and rebuilt

//    to use the right video mode.

//

//####DESCRIPTIONEND####

//

//========================================================================*/

#include <stdio.h>

#include <stdlib.h>

struct VBESVGAInfoBlock {

    unsigned char   signature[4];      /* VESA */

    unsigned short  version;

    char*           oem_string_ptr;

    unsigned char   capabilities[4];

    unsigned short* video_mode_ptr;

    unsigned short  total_memory;

    unsigned short  oem_software_rev;

    char*           oem_vendor_name_ptr;

    char*           oem_product_name_ptr;

    char*           oem_product_rev_ptr;

    /* Reserved data here */

} __attribute__((packed));

struct VBEModeInfoBlock {

    unsigned short  mode_attributes;

    unsigned char   win_a_atributes;

    unsigned char   win_b_attributes;

    unsigned short  win_granularity;

    unsigned short  win_size;

    unsigned short  win_a_segment;

    unsigned short  win_b_segment;

    unsigned int    win_func_ptr;

    unsigned short  bytes_per_scanline;

    unsigned short  x_resolution;

    unsigned short  y_resolution;

    unsigned char   x_char_size;

    unsigned char   y_char_size;

    unsigned char   number_of_planes;

    unsigned char   bits_per_pixel;

    unsigned char   number_of_banks;

    unsigned char   memory_model;

    unsigned char   bank_size;

    unsigned char   number_of_image_pages;

    unsigned char   reserved;

    unsigned char   red_mask_size;

    unsigned char   red_field_position;

    unsigned char   green_mask_size;

    unsigned char   green_field_position;

    unsigned char   blue_mask_size;

    unsigned char   blue_field_position;

    unsigned char   reserved_mask_size;

    unsigned char   reserved_field_position;

    unsigned char   direct_color_mode_info;

    unsigned int    physical_base_ptr;

    unsigned int    offscreen_memory_offset;

    unsigned short  offscreen_memory_size;

} __attribute__((packed));

static char*

segoff_to_phys(char* addr)

{

    int x       = (int) addr;

    int segment = (x >> 12) & 0x0FFFF0;

    int offset  = x & 0x0FFFF;

    return (char*) (segment | offset);

}

int

main(int argc, char** argv)

{

    struct VBESVGAInfoBlock*    info_block = (struct VBESVGAInfoBlock*) 0x000A0000;

    struct VBEModeInfoBlock*    current_mode = (struct VBEModeInfoBlock*) 0x000A0200;

    int i;

    printf("VESA info: %c%c%c%c\n", info_block->signature[0], info_block->signature[1],

           info_block->signature[2], info_block->signature[3]);

    printf("version %04x\n", info_block->version);

    if (NULL != info_block->oem_string_ptr) {

        info_block->oem_string_ptr = segoff_to_phys(info_block->oem_string_ptr);

        printf("OEM %s\n", info_block->oem_string_ptr);

    }

    printf("total memory %dK\n", 64 * info_block->total_memory);

    printf("oem software rev %04x\n", info_block->oem_software_rev);

    if (NULL != info_block->oem_vendor_name_ptr) {

        info_block->oem_vendor_name_ptr = segoff_to_phys(info_block->oem_vendor_name_ptr);

        printf("OEM vendor %s\n", info_block->oem_vendor_name_ptr);

    }

    if (NULL != info_block->oem_product_name_ptr) {

        info_block->oem_product_name_ptr = segoff_to_phys(info_block->oem_product_name_ptr);

        printf("OEM product name %s\n", info_block->oem_product_name_ptr);

    }

    if (NULL != info_block->oem_product_rev_ptr) {

        info_block->oem_product_rev_ptr = segoff_to_phys(info_block->oem_product_rev_ptr);

        printf("OEM product revision %s\n", info_block->oem_product_rev_ptr);

    }

    printf("Capabilities: %02x, %02x, %02x, %02x\n",

           info_block->capabilities[0], info_block->capabilities[1],

           info_block->capabilities[2], info_block->capabilities[3]);

    info_block->video_mode_ptr = (unsigned short*) segoff_to_phys((char*) info_block->video_mode_ptr);

    for (i = 0; 0x0FFFF != info_block->video_mode_ptr[i]; i++) {

        int mode = info_block->video_mode_ptr[i];

        struct VBEModeInfoBlock*   mode_data   = (struct VBEModeInfoBlock*) (0x0A0400 + (0x100 * i));

        printf("Mode %04x: %4d*%4d @ %2dbpp, %4d bytes/line, fb %s 0x%08x\n", mode,

               mode_data->x_resolution, mode_data->y_resolution, mode_data->bits_per_pixel,

               mode_data->bytes_per_scanline,

               (0 == (mode_data->mode_attributes & 0x0080)) ? "no " : "yes",

               mode_data->physical_base_ptr);

        if (8 < mode_data->bits_per_pixel) {

            printf("    red %d bits << %d, green %d bits << %d, blue %d bits << %d, reserved %d bits << %d\n",

                   mode_data->red_mask_size, mode_data->red_field_position,

                   mode_data->green_mask_size, mode_data->green_field_position,

                   mode_data->blue_mask_size, mode_data->blue_field_position,

                   mode_data->reserved_mask_size, mode_data->reserved_field_position);

        }

    }

    printf("Current mode: %4d*%4d @ %2dbpp, %4d bytes/line, fb %s 0x%08x\n",

           current_mode->x_resolution, current_mode->y_resolution, current_mode->bits_per_pixel,

           current_mode->bytes_per_scanline,

           (0 == (current_mode->mode_attributes & 0x0080)) ? "no" : "yes",

           current_mode->physical_base_ptr);

    if (8 < current_mode->bits_per_pixel) {

        printf("    red %d bits << %d, green %d bits << %d, blue %d bits << %d, reserved %d bits << %d\n",

               current_mode->red_mask_size, current_mode->red_field_position,

               current_mode->green_mask_size, current_mode->green_field_position,

               current_mode->blue_mask_size, current_mode->blue_field_position,

               current_mode->reserved_mask_size, current_mode->reserved_field_position);

    }

    exit(0);

}