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/* ----------------------------------------------------------------------- *
*
* Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
* Copyright 2013 Intel Corporation
*
* This program 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, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
*
* font.c
*
* VGA font handling code
*
*/
#include <syslinux/firmware.h>
#include <syslinux/video.h>
#include <sys/io.h>
#include <stdio.h>
#include <fs.h>
#include "bios.h"
#include "graphics.h"
#include "core.h"
__export uint8_t UserFont = 0; /* Using a user-specified font */
__export __lowmem char fontbuf[8192];
uint16_t GXPixCols = 1; /* Graphics mode pixel columns */
uint16_t GXPixRows = 1; /* Graphics mode pixel rows */
/*
* loadfont: Load a .psf font file and install it onto the VGA console
* (if we're not on a VGA screen then ignore.)
*/
__export void loadfont(const char *filename)
{
struct psfheader {
uint16_t magic;
uint8_t mode;
uint8_t height;
} hdr;
FILE *f;
f = fopen(filename, "r");
if (!f)
return;
/* Read header */
if (_fread(&hdr, sizeof hdr, f) != sizeof hdr)
goto fail;
/* Magic number */
if (hdr.magic != 0x0436)
goto fail;
/* File mode: font modes 0-5 supported */
if (hdr.mode > 5)
goto fail;
/* VGA minimum/maximum */
if (hdr.height < 2 || hdr.height > 32)
goto fail;
/* Load the actual font into the font buffer. */
memset(fontbuf, 0, 256*32);
if (_fread(fontbuf, 256*hdr.height, f) != 256*hdr.height)
goto fail;
/* Loaded OK */
VGAFontSize = hdr.height;
UserFont = 1; /* Set font flag */
use_font();
fail:
fclose(f);
}
/*
* use_font:
* This routine activates whatever font happens to be in the
* vgafontbuf, and updates the bios_adjust_screen data.
* Must be called with CS = DS
*/
void use_font(void)
{
com32sys_t ireg, oreg;
uint8_t bytes = VGAFontSize;
/* Nonstandard mode? */
if (UsingVGA & ~0x3)
syslinux_force_text_mode();
memset(&ireg, 0, sizeof(ireg));
ireg.es = SEG(fontbuf);
ireg.ebp.w[0] = OFFS(fontbuf); /* ES:BP -> font */
/* Are we using a user-specified font? */
if (UserFont & 0x1) {
/* Are we in graphics mode? */
if (UsingVGA & 0x1) {
uint8_t rows;
rows = GXPixRows / bytes;
VidRows = rows - 1;
/* Set user character table */
ireg.eax.w[0] = 0x1121;
ireg.ebx.b[0] = 0;
ireg.ecx.b[0] = bytes; /* bytes/character */
ireg.edx.b[0] = rows;
__intcall(0x10, &ireg, &oreg);
/* 8 pixels/character */
VidCols = ((GXPixCols >> 3) - 1);
/* No need to call bios_adjust_screen */
return;
} else {
ireg.eax.w[0] = 0x1110; /* Load into VGA RAM */
ireg.ebx.b[0] = 0;
ireg.ebx.b[1] = bytes; /* bytes/character */
ireg.ecx.w[0] = 256;
ireg.edx.w[0] = 0;
__intcall(0x10, &ireg, &oreg);
memset(&ireg, 0, sizeof(ireg));
ireg.ebx.b[0] = 0;
ireg.eax.w[0] = 0x1103; /* Select page 0 */
__intcall(0x10, &ireg, NULL);
}
}
bios_adjust_screen();
}
/*
* bios_adjust_screen: Set the internal variables associated with the screen size.
* This is a subroutine in case we're loading a custom font.
*/
void bios_adjust_screen(void)
{
com32sys_t ireg, oreg;
volatile uint8_t *vidrows = (volatile uint8_t *)BIOS_vidrows;
uint8_t rows, cols;
memset(&ireg, 0, sizeof(ireg));
rows = *vidrows;
if (!rows) {
/*
* No vidrows in BIOS, assume 25.
* (Remember: vidrows == rows-1)
*/
rows = 24;
}
VidRows = rows;
ireg.eax.b[1] = 0x0f; /* Read video state */
__intcall(0x10, &ireg, &oreg);
cols = oreg.eax.b[1];
VidCols = --cols; /* Store count-1 (same as rows) */
}
void adjust_screen(void)
{
if (firmware->adjust_screen)
firmware->adjust_screen();
}
void pm_adjust_screen(com32sys_t *regs __unused)
{
adjust_screen();
}
void pm_userfont(com32sys_t *regs)
{
regs->es = SEG(fontbuf);
regs->ebx.w[0] = OFFS(fontbuf);
}
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