diff options
Diffstat (limited to 'core/font.c')
| -rw-r--r-- | core/font.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/core/font.c b/core/font.c new file mode 100644 index 0000000..508f705 --- /dev/null +++ b/core/font.c @@ -0,0 +1,193 @@ +/* ----------------------------------------------------------------------- * + * + * 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); +} |