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/*
* -----------------------------------------------------------------------
*
* Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
*
* 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 <sys/io.h>
#include <stdio.h>
#include <fs.h>
#include "bios.h"
#include "core.h"
struct aux {
char fontbuf[8192];
char serial[serial_buf_size];
};
#define fontbuf offsetof(struct aux, fontbuf)
extern uint16_t VGAFontSize;
extern uint8_t UserFont;
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.)
*
* The .psf font file must alredy be open and getc_file must be set.
*/
void loadfont(char *filename)
{
uint16_t height, magic;
uint32_t *di, *si;
FILE *f;
char *p;
int i;
f = fopen(filename, "r");
if (!f)
return;
p = trackbuf;
/* Read header */
for (i = 0; i < 4; i++) {
char ch = getc(f);
if (ch == EOF)
return;
*p++ = ch;
}
/* Magic number */
magic = *(uint16_t *)trackbuf;
if (magic != 0x0436)
return;
/* File mode: font modes 0-5 supported */
if (*(trackbuf) > 5)
return;
height = *(trackbuf + 3); /* Height of font */
/* VGA minimum/maximum */
if (height < 2 || height > 32)
return;
/* Load the actual font. Bytes = font height * 256 */
p = trackbuf;
for (i = 0; i < (height << 8); i++) {
char ch = getc(f);
if (ch == EOF)
return;
*p++ = ch;
}
/* Copy to font buffer */
VGAFontSize = height;
di = (uint32_t *)MK_PTR(aux_seg, fontbuf);
si = (uint32_t *)trackbuf;
for (i = 0; i < (height << 6); i++)
*di++ = *si++;
UserFont = 1; /* Set font flag */
use_font();
}
/*
* 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)
vgaclearmode();
memset(&ireg, 0, sizeof(ireg));
ireg.es = aux_seg;
ireg.ebp.w[0] = 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);
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 = BIOS_vidrows;
uint8_t rows, cols;
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 pm_adjust_screen(com32sys_t *regs)
{
bios_adjust_screen();
}
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