linux/arch/x86/boot/video-vga.c
H. Peter Anvin 2495fbf7ef x86, setup: remove obsolete pre-Kconfig CONFIG_VIDEO_ variables
There were a set of pre-Kconfig configuration variables defined in the
video code.  There is absolutely no evidence that they have been
tweaked by anybody in modern history, so just get rid of them and hope
nobody notices.  If someone does complain, these should be made real
Kconfig variables.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-06-26 11:02:31 -07:00

297 lines
5.8 KiB
C

/* -*- linux-c -*- ------------------------------------------------------- *
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright 2007 rPath, Inc. - All Rights Reserved
* Copyright 2009 Intel Corporation; author H. Peter Anvin
*
* This file is part of the Linux kernel, and is made available under
* the terms of the GNU General Public License version 2.
*
* ----------------------------------------------------------------------- */
/*
* Common all-VGA modes
*/
#include "boot.h"
#include "video.h"
static struct mode_info vga_modes[] = {
{ VIDEO_80x25, 80, 25, 0 },
{ VIDEO_8POINT, 80, 50, 0 },
{ VIDEO_80x43, 80, 43, 0 },
{ VIDEO_80x28, 80, 28, 0 },
{ VIDEO_80x30, 80, 30, 0 },
{ VIDEO_80x34, 80, 34, 0 },
{ VIDEO_80x60, 80, 60, 0 },
};
static struct mode_info ega_modes[] = {
{ VIDEO_80x25, 80, 25, 0 },
{ VIDEO_8POINT, 80, 43, 0 },
};
static struct mode_info cga_modes[] = {
{ VIDEO_80x25, 80, 25, 0 },
};
static __videocard video_vga;
/* Set basic 80x25 mode */
static u8 vga_set_basic_mode(void)
{
struct biosregs ireg, oreg;
u16 ax;
u8 rows;
u8 mode;
initregs(&ireg);
ax = 0x0f00;
intcall(0x10, &ireg, &oreg);
mode = oreg.al;
set_fs(0);
rows = rdfs8(0x484); /* rows minus one */
if ((oreg.ax == 0x5003 || oreg.ax == 0x5007) &&
(rows == 0 || rows == 24))
return mode;
if (mode != 3 && mode != 7)
mode = 3;
/* Set the mode */
ireg.ax = mode; /* AH=0: set mode */
intcall(0x10, &ireg, NULL);
do_restore = 1;
return mode;
}
static void vga_set_8font(void)
{
/* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */
struct biosregs ireg;
initregs(&ireg);
/* Set 8x8 font */
ireg.ax = 0x1112;
/* ireg.bl = 0; */
intcall(0x10, &ireg, NULL);
/* Use alternate print screen */
ireg.ax = 0x1200;
ireg.bl = 0x20;
intcall(0x10, &ireg, NULL);
/* Turn off cursor emulation */
ireg.ax = 0x1201;
ireg.bl = 0x34;
intcall(0x10, &ireg, NULL);
/* Cursor is scan lines 6-7 */
ireg.ax = 0x0100;
ireg.cx = 0x0607;
intcall(0x10, &ireg, NULL);
}
static void vga_set_14font(void)
{
/* Set 9x14 font - 80x28 on VGA */
struct biosregs ireg;
initregs(&ireg);
/* Set 9x14 font */
ireg.ax = 0x1111;
/* ireg.bl = 0; */
intcall(0x10, &ireg, NULL);
/* Turn off cursor emulation */
ireg.ax = 0x1201;
ireg.bl = 0x34;
intcall(0x10, &ireg, NULL);
/* Cursor is scan lines 11-12 */
ireg.ax = 0x0100;
ireg.cx = 0x0b0c;
intcall(0x10, &ireg, NULL);
}
static void vga_set_80x43(void)
{
/* Set 80x43 mode on VGA (not EGA) */
struct biosregs ireg;
initregs(&ireg);
/* Set 350 scans */
ireg.ax = 0x1201;
ireg.bl = 0x30;
intcall(0x10, &ireg, NULL);
/* Reset video mode */
ireg.ax = 0x0003;
intcall(0x10, &ireg, NULL);
vga_set_8font();
}
/* I/O address of the VGA CRTC */
u16 vga_crtc(void)
{
return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4;
}
static void vga_set_480_scanlines(void)
{
u16 crtc; /* CRTC base address */
u8 csel; /* CRTC miscellaneous output register */
crtc = vga_crtc();
out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */
out_idx(0x0b, crtc, 0x06); /* Vertical total */
out_idx(0x3e, crtc, 0x07); /* Vertical overflow */
out_idx(0xea, crtc, 0x10); /* Vertical sync start */
out_idx(0xdf, crtc, 0x12); /* Vertical display end */
out_idx(0xe7, crtc, 0x15); /* Vertical blank start */
out_idx(0x04, crtc, 0x16); /* Vertical blank end */
csel = inb(0x3cc);
csel &= 0x0d;
csel |= 0xe2;
outb(csel, 0x3c2);
}
static void vga_set_vertical_end(int lines)
{
u16 crtc; /* CRTC base address */
u8 ovfw; /* CRTC overflow register */
int end = lines-1;
crtc = vga_crtc();
ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40);
out_idx(ovfw, crtc, 0x07); /* Vertical overflow */
out_idx(end, crtc, 0x12); /* Vertical display end */
}
static void vga_set_80x30(void)
{
vga_set_480_scanlines();
vga_set_vertical_end(30*16);
}
static void vga_set_80x34(void)
{
vga_set_480_scanlines();
vga_set_14font();
vga_set_vertical_end(34*14);
}
static void vga_set_80x60(void)
{
vga_set_480_scanlines();
vga_set_8font();
vga_set_vertical_end(60*8);
}
static int vga_set_mode(struct mode_info *mode)
{
/* Set the basic mode */
vga_set_basic_mode();
/* Override a possibly broken BIOS */
force_x = mode->x;
force_y = mode->y;
switch (mode->mode) {
case VIDEO_80x25:
break;
case VIDEO_8POINT:
vga_set_8font();
break;
case VIDEO_80x43:
vga_set_80x43();
break;
case VIDEO_80x28:
vga_set_14font();
break;
case VIDEO_80x30:
vga_set_80x30();
break;
case VIDEO_80x34:
vga_set_80x34();
break;
case VIDEO_80x60:
vga_set_80x60();
break;
}
return 0;
}
/*
* Note: this probe includes basic information required by all
* systems. It should be executed first, by making sure
* video-vga.c is listed first in the Makefile.
*/
static int vga_probe(void)
{
static const char *card_name[] = {
"CGA/MDA/HGC", "EGA", "VGA"
};
static struct mode_info *mode_lists[] = {
cga_modes,
ega_modes,
vga_modes,
};
static int mode_count[] = {
sizeof(cga_modes)/sizeof(struct mode_info),
sizeof(ega_modes)/sizeof(struct mode_info),
sizeof(vga_modes)/sizeof(struct mode_info),
};
struct biosregs ireg, oreg;
initregs(&ireg);
ireg.ax = 0x1200;
ireg.bl = 0x10; /* Check EGA/VGA */
intcall(0x10, &ireg, &oreg);
#ifndef _WAKEUP
boot_params.screen_info.orig_video_ega_bx = oreg.bx;
#endif
/* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
if (oreg.bl != 0x10) {
/* EGA/VGA */
ireg.ax = 0x1a00;
intcall(0x10, &ireg, &oreg);
if (oreg.al == 0x1a) {
adapter = ADAPTER_VGA;
#ifndef _WAKEUP
boot_params.screen_info.orig_video_isVGA = 1;
#endif
} else {
adapter = ADAPTER_EGA;
}
} else {
adapter = ADAPTER_CGA;
}
video_vga.modes = mode_lists[adapter];
video_vga.card_name = card_name[adapter];
return mode_count[adapter];
}
static __videocard video_vga = {
.card_name = "VGA",
.probe = vga_probe,
.set_mode = vga_set_mode,
};