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/* ----------------------------------------------------------------------- *
*
* Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* initvesa.c
*
* Query the VESA BIOS and select a 640x480x32 mode with local mapping
* support, if one exists.
*/
#include <inttypes.h>
#include <com32.h>
#include <stdlib.h>
#include <string.h>
#include <sys/fpu.h>
#include <syslinux/video.h>
#include "vesa.h"
#include "video.h"
#include "fill.h"
#include "debug.h"
struct vesa_info __vesa_info;
struct vesa_char *__vesacon_text_display;
int __vesacon_font_height;
int __vesacon_text_rows;
int __vesacon_text_cols;
enum vesa_pixel_format __vesacon_pixel_format = PXF_NONE;
unsigned int __vesacon_bytes_per_pixel;
uint8_t __vesacon_graphics_font[FONT_MAX_CHARS][FONT_MAX_HEIGHT];
uint32_t *__vesacon_background, *__vesacon_shadowfb;
static void unpack_font(uint8_t * dst, uint8_t * src, int height)
{
int i;
for (i = 0; i < FONT_MAX_CHARS; i++) {
memcpy(dst, src, height);
memset(dst + height, 0, FONT_MAX_HEIGHT - height);
dst += FONT_MAX_HEIGHT;
src += height;
}
}
static int vesacon_set_mode(int *x, int *y)
{
uint8_t *rom_font;
struct vesa_mode_info *mi;
enum vesa_pixel_format bestpxf;
int rv;
debug("Hello, World!\r\n");
/* Free any existing data structures */
if (__vesacon_background) {
free(__vesacon_background);
__vesacon_background = NULL;
}
if (__vesacon_shadowfb) {
free(__vesacon_shadowfb);
__vesacon_shadowfb = NULL;
}
rv = firmware->vesa->set_mode(&__vesa_info, x, y, &bestpxf);
if (rv)
return rv;
mi = &__vesa_info.mi;
__vesacon_bytes_per_pixel = (mi->bpp + 7) >> 3;
__vesacon_format_pixels = __vesacon_format_pixels_list[bestpxf];
/* Download the SYSLINUX- or firmware-provided font */
__vesacon_font_height = syslinux_font_query(&rom_font);
if (!__vesacon_font_height)
__vesacon_font_height = firmware->vesa->font_query(&rom_font);
unpack_font((uint8_t *) __vesacon_graphics_font, rom_font,
__vesacon_font_height);
__vesacon_background = calloc(mi->h_res*mi->v_res, 4);
__vesacon_shadowfb = calloc(mi->h_res*mi->v_res, 4);
__vesacon_init_copy_to_screen();
/* Tell syslinux we changed video mode */
/* In theory this should be:
flags = (mi->mode_attr & 4) ? 0x0007 : 0x000f;
However, that would assume all systems that claim to handle text
output in VESA modes actually do that... */
syslinux_report_video_mode(0x000f, mi->h_res, mi->v_res);
__vesacon_pixel_format = bestpxf;
return 0;
}
/* FIXME:
* Does init_text_display need an EFI counterpart?
* e.g. vesa_char may need to setup UNICODE char for EFI
* and the number of screen chars may need to be sized up
* accordingly. This may also require turning byte strings
* into unicode strings in the framebuffer
* Possibly, revisit vesacon_fill() for EFI.
*/
static int init_text_display(void)
{
size_t nchars;
struct vesa_char *ptr;
struct vesa_char def_char = {
.ch = ' ',
.attr = 0,
};
if (__vesacon_text_display)
free(__vesacon_text_display);
__vesacon_text_cols = TEXT_PIXEL_COLS / FONT_WIDTH;
__vesacon_text_rows = TEXT_PIXEL_ROWS / __vesacon_font_height;
nchars = (__vesacon_text_cols+2) * (__vesacon_text_rows+2);
__vesacon_text_display = ptr = malloc(nchars * sizeof(struct vesa_char));
if (!ptr)
return -1;
vesacon_fill(ptr, def_char, nchars);
__vesacon_init_cursor(__vesacon_font_height);
return 0;
}
/*
* On input, VESA initialization is passed a desirable resolution. On
* return, either the requested resolution is set or the system
* supported default resolution is set and returned to the caller.
*/
int __vesacon_init(int *x, int *y)
{
int rv;
/* We need the FPU for graphics, at least libpng et al will need it... */
if (x86_init_fpu())
return 10;
rv = vesacon_set_mode(x, y);
if (rv) {
/* Try to see if we can just patch the BIOS... */
if (__vesacon_i915resolution(*x, *y))
return rv;
if (vesacon_set_mode(x, y))
return rv;
}
init_text_display();
debug("Mode set, now drawing at %#p\r\n", __vesa_info.mi.lfb_ptr);
__vesacon_init_background();
debug("Ready!\r\n");
return 0;
}
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