/* ----------------------------------------------------------------------- *
*
* 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 __constfunc is_power_of_2(unsigned int x)
{
return x && !(x & (x - 1));
}
static int vesacon_paged_mode_ok(const struct vesa_mode_info *mi)
{
int i;
if (!is_power_of_2(mi->win_size) ||
!is_power_of_2(mi->win_grain) || mi->win_grain > mi->win_size)
return 0; /* Impossible... */
for (i = 0; i < 2; i++) {
if ((mi->win_attr[i] & 0x05) == 0x05 && mi->win_seg[i])
return 1; /* Usable window */
}
return 0; /* Nope... */
}
static int vesacon_set_mode(int x, int y)
{
com32sys_t rm;
uint8_t *rom_font;
uint16_t mode, bestmode, *mode_ptr;
struct vesa_info *vi;
struct vesa_general_info *gi;
struct vesa_mode_info *mi;
enum vesa_pixel_format pxf, bestpxf;
int err = 0;
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;
}
/* Allocate space in the bounce buffer for these structures */
vi = lzalloc(sizeof *vi);
if (!vi) {
err = 10; /* Out of memory */
goto exit;
}
gi = &vi->gi;
mi = &vi->mi;
memset(&rm, 0, sizeof rm);
gi->signature = VBE2_MAGIC; /* Get VBE2 extended data */
rm.eax.w[0] = 0x4F00; /* Get SVGA general information */
rm.edi.w[0] = OFFS(gi);
rm.es = SEG(gi);
__intcall(0x10, &rm, &rm);
if (rm.eax.w[0] != 0x004F) {
err = 1; /* Function call failed */
goto exit;
}
if (gi->signature != VESA_MAGIC) {
err = 2; /* No magic */
goto exit;
}
if (gi->version < 0x0102) {
err = 3; /* VESA 1.2+ required */
goto exit;
}
/* Copy general info */
memcpy(&__vesa_info.gi, gi, sizeof *gi);
/* Search for the proper mode with a suitable color and memory model... */
mode_ptr = GET_PTR(gi->video_mode_ptr);
bestmode = 0;
bestpxf = PXF_NONE;
while ((mode = *mode_ptr++) != 0xFFFF) {
mode &= 0x1FF; /* The rest are attributes of sorts */
debug("Found mode: 0x%04x\r\n", mode);
memset(mi, 0, sizeof *mi);
rm.eax.w[0] = 0x4F01; /* Get SVGA mode information */
rm.ecx.w[0] = mode;
rm.edi.w[0] = OFFS(mi);
rm.es = SEG(mi);
__intcall(0x10, &rm, &rm);
/* Must be a supported mode */
if (rm.eax.w[0] != 0x004f)
continue;
debug
("mode_attr 0x%04x, h_res = %4d, v_res = %4d, bpp = %2d, layout = %d (%d,%d,%d)\r\n",
mi->mode_attr, mi->h_res, mi->v_res, mi->bpp, mi->memory_layout,
mi->rpos, mi->gpos, mi->bpos);
/* Must be an LFB color graphics mode supported by the hardware.
The bits tested are:
4 - graphics mode
3 - color mode
1 - mode information available (mandatory in VBE 1.2+)
0 - mode supported by hardware
*/
if ((mi->mode_attr & 0x001b) != 0x001b)
continue;
/* Must be the chosen size */
if (mi->h_res != x || mi->v_res != y)
continue;
/* We don't support multibank (interlaced memory) modes */
/*
* Note: The Bochs VESA BIOS (vbe.c 1.58 2006/08/19) violates the
* specification which states that banks == 1 for unbanked modes;
* fortunately it does report bank_size == 0 for those.
*/
if (mi->banks > 1 && mi->bank_size) {
debug("bad: banks = %d, banksize = %d, pages = %d\r\n",
mi->banks, mi->bank_size, mi->image_pages);
continue;
}
/* Must be either a flat-framebuffer mode, or be an acceptable
paged mode */
if (!(mi->mode_attr & 0x0080) && !vesacon_paged_mode_ok(mi)) {
debug("bad: invalid paged mode\r\n");
continue;
}
/* Must either be a packed-pixel mode or a direct color mode
(depending on VESA version ); must be a supported pixel format */
pxf = PXF_NONE; /* Not usable */
if (mi->bpp == 32 &&
(mi->memory_layout == 4 ||
(mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 &&
mi->bpos == 0)))
pxf = PXF_BGRA32;
else if (mi->bpp == 24 &&
(mi->memory_layout == 4 ||
(mi->memory_layout == 6 && mi->rpos == 16 && mi->gpos == 8 &&
mi->bpos == 0)))
pxf = PXF_BGR24;
else if (mi->bpp == 16 &&
(mi->memory_layout == 4 ||
(mi->memory_layout == 6 && mi->rpos == 11 && mi->gpos == 5 &&
mi->bpos == 0)))
pxf = PXF_LE_RGB16_565;
else if (mi->bpp == 15 &&
(mi->memory_layout == 4 ||
(mi->memory_layout == 6 && mi->rpos == 10 && mi->gpos == 5 &&
mi->bpos == 0)))
pxf = PXF_LE_RGB15_555;
if (pxf < bestpxf) {
debug("Best mode so far, pxf = %d\r\n", pxf);
/* Best mode so far... */
bestmode = mode;
bestpxf = pxf;
/* Copy mode info */
memcpy(&__vesa_info.mi, mi, sizeof *mi);
}
}
if (bestpxf == PXF_NONE) {
err = 4; /* No mode found */
goto exit;
}
mi = &__vesa_info.mi;
mode = bestmode;
__vesacon_bytes_per_pixel = (mi->bpp + 7) >> 3;
__vesacon_format_pixels = __vesacon_format_pixels_list[bestpxf];
/* Download the SYSLINUX- or BIOS-provided font */
__vesacon_font_height = syslinux_font_query(&rom_font);
if (!__vesacon_font_height) {
/* Get BIOS 8x16 font */
rm.eax.w[0] = 0x1130; /* Get Font Information */
rm.ebx.w[0] = 0x0600; /* Get 8x16 ROM font */
__intcall(0x10, &rm, &rm);
rom_font = MK_PTR(rm.es, rm.ebp.w[0]);
__vesacon_font_height = 16;
}
unpack_font((uint8_t *) __vesacon_graphics_font, rom_font,
__vesacon_font_height);
/* Now set video mode */
rm.eax.w[0] = 0x4F02; /* Set SVGA video mode */
if (mi->mode_attr & 0x0080)
mode |= 0x4000; /* Request linear framebuffer if supported */
rm.ebx.w[0] = mode;
__intcall(0x10, &rm, &rm);
if (rm.eax.w[0] != 0x004F) {
err = 9; /* Failed to set mode */
goto exit;
}
__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;
exit:
if (vi)
lfree(vi);
return err;
}
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;
}
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;
}
