346 lines
7.2 KiB
C
346 lines
7.2 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.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Select video mode
|
|
*/
|
|
|
|
#include <uapi/asm/boot.h>
|
|
|
|
#include "boot.h"
|
|
#include "video.h"
|
|
#include "vesa.h"
|
|
|
|
static u16 video_segment;
|
|
|
|
static void store_cursor_position(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
|
|
initregs(&ireg);
|
|
ireg.ah = 0x03;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
boot_params.screen_info.orig_x = oreg.dl;
|
|
boot_params.screen_info.orig_y = oreg.dh;
|
|
|
|
if (oreg.ch & 0x20)
|
|
boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
|
|
|
|
if ((oreg.ch & 0x1f) > (oreg.cl & 0x1f))
|
|
boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
|
|
}
|
|
|
|
static void store_video_mode(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
|
|
/* N.B.: the saving of the video page here is a bit silly,
|
|
since we pretty much assume page 0 everywhere. */
|
|
initregs(&ireg);
|
|
ireg.ah = 0x0f;
|
|
intcall(0x10, &ireg, &oreg);
|
|
|
|
/* Not all BIOSes are clean with respect to the top bit */
|
|
boot_params.screen_info.orig_video_mode = oreg.al & 0x7f;
|
|
boot_params.screen_info.orig_video_page = oreg.bh;
|
|
}
|
|
|
|
/*
|
|
* Store the video mode parameters for later usage by the kernel.
|
|
* This is done by asking the BIOS except for the rows/columns
|
|
* parameters in the default 80x25 mode -- these are set directly,
|
|
* because some very obscure BIOSes supply insane values.
|
|
*/
|
|
static void store_mode_params(void)
|
|
{
|
|
u16 font_size;
|
|
int x, y;
|
|
|
|
/* For graphics mode, it is up to the mode-setting driver
|
|
(currently only video-vesa.c) to store the parameters */
|
|
if (graphic_mode)
|
|
return;
|
|
|
|
store_cursor_position();
|
|
store_video_mode();
|
|
|
|
if (boot_params.screen_info.orig_video_mode == 0x07) {
|
|
/* MDA, HGC, or VGA in monochrome mode */
|
|
video_segment = 0xb000;
|
|
} else {
|
|
/* CGA, EGA, VGA and so forth */
|
|
video_segment = 0xb800;
|
|
}
|
|
|
|
set_fs(0);
|
|
font_size = rdfs16(0x485); /* Font size, BIOS area */
|
|
boot_params.screen_info.orig_video_points = font_size;
|
|
|
|
x = rdfs16(0x44a);
|
|
y = (adapter == ADAPTER_CGA) ? 25 : rdfs8(0x484)+1;
|
|
|
|
if (force_x)
|
|
x = force_x;
|
|
if (force_y)
|
|
y = force_y;
|
|
|
|
boot_params.screen_info.orig_video_cols = x;
|
|
boot_params.screen_info.orig_video_lines = y;
|
|
}
|
|
|
|
static unsigned int get_entry(void)
|
|
{
|
|
char entry_buf[4];
|
|
int i, len = 0;
|
|
int key;
|
|
unsigned int v;
|
|
|
|
do {
|
|
key = getchar();
|
|
|
|
if (key == '\b') {
|
|
if (len > 0) {
|
|
puts("\b \b");
|
|
len--;
|
|
}
|
|
} else if ((key >= '0' && key <= '9') ||
|
|
(key >= 'A' && key <= 'Z') ||
|
|
(key >= 'a' && key <= 'z')) {
|
|
if (len < sizeof(entry_buf)) {
|
|
entry_buf[len++] = key;
|
|
putchar(key);
|
|
}
|
|
}
|
|
} while (key != '\r');
|
|
putchar('\n');
|
|
|
|
if (len == 0)
|
|
return VIDEO_CURRENT_MODE; /* Default */
|
|
|
|
v = 0;
|
|
for (i = 0; i < len; i++) {
|
|
v <<= 4;
|
|
key = entry_buf[i] | 0x20;
|
|
v += (key > '9') ? key-'a'+10 : key-'0';
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
static void display_menu(void)
|
|
{
|
|
struct card_info *card;
|
|
struct mode_info *mi;
|
|
char ch;
|
|
int i;
|
|
int nmodes;
|
|
int modes_per_line;
|
|
int col;
|
|
|
|
nmodes = 0;
|
|
for (card = video_cards; card < video_cards_end; card++)
|
|
nmodes += card->nmodes;
|
|
|
|
modes_per_line = 1;
|
|
if (nmodes >= 20)
|
|
modes_per_line = 3;
|
|
|
|
for (col = 0; col < modes_per_line; col++)
|
|
puts("Mode: Resolution: Type: ");
|
|
putchar('\n');
|
|
|
|
col = 0;
|
|
ch = '0';
|
|
for (card = video_cards; card < video_cards_end; card++) {
|
|
mi = card->modes;
|
|
for (i = 0; i < card->nmodes; i++, mi++) {
|
|
char resbuf[32];
|
|
int visible = mi->x && mi->y;
|
|
u16 mode_id = mi->mode ? mi->mode :
|
|
(mi->y << 8)+mi->x;
|
|
|
|
if (!visible)
|
|
continue; /* Hidden mode */
|
|
|
|
if (mi->depth)
|
|
sprintf(resbuf, "%dx%d", mi->y, mi->depth);
|
|
else
|
|
sprintf(resbuf, "%d", mi->y);
|
|
|
|
printf("%c %03X %4dx%-7s %-6s",
|
|
ch, mode_id, mi->x, resbuf, card->card_name);
|
|
col++;
|
|
if (col >= modes_per_line) {
|
|
putchar('\n');
|
|
col = 0;
|
|
}
|
|
|
|
if (ch == '9')
|
|
ch = 'a';
|
|
else if (ch == 'z' || ch == ' ')
|
|
ch = ' '; /* Out of keys... */
|
|
else
|
|
ch++;
|
|
}
|
|
}
|
|
if (col)
|
|
putchar('\n');
|
|
}
|
|
|
|
#define H(x) ((x)-'a'+10)
|
|
#define SCAN ((H('s')<<12)+(H('c')<<8)+(H('a')<<4)+H('n'))
|
|
|
|
static unsigned int mode_menu(void)
|
|
{
|
|
int key;
|
|
unsigned int sel;
|
|
|
|
puts("Press <ENTER> to see video modes available, "
|
|
"<SPACE> to continue, or wait 30 sec\n");
|
|
|
|
kbd_flush();
|
|
while (1) {
|
|
key = getchar_timeout();
|
|
if (key == ' ' || key == 0)
|
|
return VIDEO_CURRENT_MODE; /* Default */
|
|
if (key == '\r')
|
|
break;
|
|
putchar('\a'); /* Beep! */
|
|
}
|
|
|
|
|
|
for (;;) {
|
|
display_menu();
|
|
|
|
puts("Enter a video mode or \"scan\" to scan for "
|
|
"additional modes: ");
|
|
sel = get_entry();
|
|
if (sel != SCAN)
|
|
return sel;
|
|
|
|
probe_cards(1);
|
|
}
|
|
}
|
|
|
|
/* Save screen content to the heap */
|
|
static struct saved_screen {
|
|
int x, y;
|
|
int curx, cury;
|
|
u16 *data;
|
|
} saved;
|
|
|
|
static void save_screen(void)
|
|
{
|
|
/* Should be called after store_mode_params() */
|
|
saved.x = boot_params.screen_info.orig_video_cols;
|
|
saved.y = boot_params.screen_info.orig_video_lines;
|
|
saved.curx = boot_params.screen_info.orig_x;
|
|
saved.cury = boot_params.screen_info.orig_y;
|
|
|
|
if (!heap_free(saved.x*saved.y*sizeof(u16)+512))
|
|
return; /* Not enough heap to save the screen */
|
|
|
|
saved.data = GET_HEAP(u16, saved.x*saved.y);
|
|
|
|
set_fs(video_segment);
|
|
copy_from_fs(saved.data, 0, saved.x*saved.y*sizeof(u16));
|
|
}
|
|
|
|
static void restore_screen(void)
|
|
{
|
|
/* Should be called after store_mode_params() */
|
|
int xs = boot_params.screen_info.orig_video_cols;
|
|
int ys = boot_params.screen_info.orig_video_lines;
|
|
int y;
|
|
addr_t dst = 0;
|
|
u16 *src = saved.data;
|
|
struct biosregs ireg;
|
|
|
|
if (graphic_mode)
|
|
return; /* Can't restore onto a graphic mode */
|
|
|
|
if (!src)
|
|
return; /* No saved screen contents */
|
|
|
|
/* Restore screen contents */
|
|
|
|
set_fs(video_segment);
|
|
for (y = 0; y < ys; y++) {
|
|
int npad;
|
|
|
|
if (y < saved.y) {
|
|
int copy = (xs < saved.x) ? xs : saved.x;
|
|
copy_to_fs(dst, src, copy*sizeof(u16));
|
|
dst += copy*sizeof(u16);
|
|
src += saved.x;
|
|
npad = (xs < saved.x) ? 0 : xs-saved.x;
|
|
} else {
|
|
npad = xs;
|
|
}
|
|
|
|
/* Writes "npad" blank characters to
|
|
video_segment:dst and advances dst */
|
|
asm volatile("pushw %%es ; "
|
|
"movw %2,%%es ; "
|
|
"shrw %%cx ; "
|
|
"jnc 1f ; "
|
|
"stosw \n\t"
|
|
"1: rep;stosl ; "
|
|
"popw %%es"
|
|
: "+D" (dst), "+c" (npad)
|
|
: "bdS" (video_segment),
|
|
"a" (0x07200720));
|
|
}
|
|
|
|
/* Restore cursor position */
|
|
if (saved.curx >= xs)
|
|
saved.curx = xs-1;
|
|
if (saved.cury >= ys)
|
|
saved.cury = ys-1;
|
|
|
|
initregs(&ireg);
|
|
ireg.ah = 0x02; /* Set cursor position */
|
|
ireg.dh = saved.cury;
|
|
ireg.dl = saved.curx;
|
|
intcall(0x10, &ireg, NULL);
|
|
|
|
store_cursor_position();
|
|
}
|
|
|
|
void set_video(void)
|
|
{
|
|
u16 mode = boot_params.hdr.vid_mode;
|
|
|
|
RESET_HEAP();
|
|
|
|
store_mode_params();
|
|
save_screen();
|
|
probe_cards(0);
|
|
|
|
for (;;) {
|
|
if (mode == ASK_VGA)
|
|
mode = mode_menu();
|
|
|
|
if (!set_mode(mode))
|
|
break;
|
|
|
|
printf("Undefined video mode number: %x\n", mode);
|
|
mode = ASK_VGA;
|
|
}
|
|
boot_params.hdr.vid_mode = mode;
|
|
vesa_store_edid();
|
|
store_mode_params();
|
|
|
|
if (do_restore)
|
|
restore_screen();
|
|
}
|