Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* -*- linux-c -*- ------------------------------------------------------- *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *   Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *   Copyright 2007 rPath, Inc. - All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *   Copyright 2009 Intel Corporation; author H. Peter Anvin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * ----------------------------------------------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Select video mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <uapi/asm/boot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "boot.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "video.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include "vesa.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) static u16 video_segment;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static void store_cursor_position(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct biosregs ireg, oreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	initregs(&ireg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	ireg.ah = 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	intcall(0x10, &ireg, &oreg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	boot_params.screen_info.orig_x = oreg.dl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	boot_params.screen_info.orig_y = oreg.dh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (oreg.ch & 0x20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if ((oreg.ch & 0x1f) > (oreg.cl & 0x1f))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static void store_video_mode(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	struct biosregs ireg, oreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	/* N.B.: the saving of the video page here is a bit silly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	   since we pretty much assume page 0 everywhere. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	initregs(&ireg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	ireg.ah = 0x0f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	intcall(0x10, &ireg, &oreg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	/* Not all BIOSes are clean with respect to the top bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	boot_params.screen_info.orig_video_mode = oreg.al & 0x7f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	boot_params.screen_info.orig_video_page = oreg.bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  * Store the video mode parameters for later usage by the kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  * This is done by asking the BIOS except for the rows/columns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * parameters in the default 80x25 mode -- these are set directly,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  * because some very obscure BIOSes supply insane values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) static void store_mode_params(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	u16 font_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	int x, y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	/* For graphics mode, it is up to the mode-setting driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	   (currently only video-vesa.c) to store the parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (graphic_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	store_cursor_position();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	store_video_mode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	if (boot_params.screen_info.orig_video_mode == 0x07) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		/* MDA, HGC, or VGA in monochrome mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		video_segment = 0xb000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		/* CGA, EGA, VGA and so forth */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		video_segment = 0xb800;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	set_fs(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	font_size = rdfs16(0x485); /* Font size, BIOS area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	boot_params.screen_info.orig_video_points = font_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	x = rdfs16(0x44a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	y = (adapter == ADAPTER_CGA) ? 25 : rdfs8(0x484)+1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (force_x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		x = force_x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (force_y)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		y = force_y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	boot_params.screen_info.orig_video_cols  = x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	boot_params.screen_info.orig_video_lines = y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static unsigned int get_entry(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	char entry_buf[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	int i, len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	unsigned int v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		key = getchar();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		if (key == '\b') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			if (len > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 				puts("\b \b");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 				len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		} else if ((key >= '0' && key <= '9') ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			   (key >= 'A' && key <= 'Z') ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			   (key >= 'a' && key <= 'z')) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			if (len < sizeof(entry_buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 				entry_buf[len++] = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 				putchar(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	} while (key != '\r');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	putchar('\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return VIDEO_CURRENT_MODE; /* Default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	v = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	for (i = 0; i < len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		v <<= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		key = entry_buf[i] | 0x20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		v += (key > '9') ? key-'a'+10 : key-'0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void display_menu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct card_info *card;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	struct mode_info *mi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	char ch;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	int nmodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	int modes_per_line;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	int col;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	nmodes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	for (card = video_cards; card < video_cards_end; card++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		nmodes += card->nmodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	modes_per_line = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (nmodes >= 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		modes_per_line = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	for (col = 0; col < modes_per_line; col++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		puts("Mode: Resolution:  Type: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	putchar('\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	col = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ch = '0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	for (card = video_cards; card < video_cards_end; card++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		mi = card->modes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		for (i = 0; i < card->nmodes; i++, mi++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			char resbuf[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			int visible = mi->x && mi->y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			u16 mode_id = mi->mode ? mi->mode :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				(mi->y << 8)+mi->x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			if (!visible)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				continue; /* Hidden mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			if (mi->depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				sprintf(resbuf, "%dx%d", mi->y, mi->depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 				sprintf(resbuf, "%d", mi->y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 			printf("%c %03X %4dx%-7s %-6s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			       ch, mode_id, mi->x, resbuf, card->card_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			col++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			if (col >= modes_per_line) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 				putchar('\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 				col = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			if (ch == '9')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 				ch = 'a';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			else if (ch == 'z' || ch == ' ')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 				ch = ' '; /* Out of keys... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 				ch++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (col)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		putchar('\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) #define H(x)	((x)-'a'+10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #define SCAN	((H('s')<<12)+(H('c')<<8)+(H('a')<<4)+H('n'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static unsigned int mode_menu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	int key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	unsigned int sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	puts("Press <ENTER> to see video modes available, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	     "<SPACE> to continue, or wait 30 sec\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	kbd_flush();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		key = getchar_timeout();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		if (key == ' ' || key == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			return VIDEO_CURRENT_MODE; /* Default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (key == '\r')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		putchar('\a');	/* Beep! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		display_menu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		puts("Enter a video mode or \"scan\" to scan for "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		     "additional modes: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		sel = get_entry();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		if (sel != SCAN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			return sel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		probe_cards(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* Save screen content to the heap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static struct saved_screen {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	int x, y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	int curx, cury;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	u16 *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) } saved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static void save_screen(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	/* Should be called after store_mode_params() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	saved.x = boot_params.screen_info.orig_video_cols;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	saved.y = boot_params.screen_info.orig_video_lines;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	saved.curx = boot_params.screen_info.orig_x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	saved.cury = boot_params.screen_info.orig_y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (!heap_free(saved.x*saved.y*sizeof(u16)+512))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return;		/* Not enough heap to save the screen */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	saved.data = GET_HEAP(u16, saved.x*saved.y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	set_fs(video_segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	copy_from_fs(saved.data, 0, saved.x*saved.y*sizeof(u16));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static void restore_screen(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	/* Should be called after store_mode_params() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	int xs = boot_params.screen_info.orig_video_cols;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int ys = boot_params.screen_info.orig_video_lines;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int y;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	addr_t dst = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	u16 *src = saved.data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	struct biosregs ireg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (graphic_mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		return;		/* Can't restore onto a graphic mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (!src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		return;		/* No saved screen contents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	/* Restore screen contents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	set_fs(video_segment);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	for (y = 0; y < ys; y++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		int npad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		if (y < saved.y) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 			int copy = (xs < saved.x) ? xs : saved.x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 			copy_to_fs(dst, src, copy*sizeof(u16));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			dst += copy*sizeof(u16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			src += saved.x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 			npad = (xs < saved.x) ? 0 : xs-saved.x;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			npad = xs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		/* Writes "npad" blank characters to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		   video_segment:dst and advances dst */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		asm volatile("pushw %%es ; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			     "movw %2,%%es ; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			     "shrw %%cx ; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			     "jnc 1f ; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			     "stosw \n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			     "1: rep;stosl ; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			     "popw %%es"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			     : "+D" (dst), "+c" (npad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			     : "bdS" (video_segment),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			       "a" (0x07200720));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	/* Restore cursor position */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (saved.curx >= xs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		saved.curx = xs-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (saved.cury >= ys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		saved.cury = ys-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	initregs(&ireg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	ireg.ah = 0x02;		/* Set cursor position */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	ireg.dh = saved.cury;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	ireg.dl = saved.curx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	intcall(0x10, &ireg, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	store_cursor_position();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) void set_video(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	u16 mode = boot_params.hdr.vid_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	RESET_HEAP();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	store_mode_params();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	save_screen();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	probe_cards(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		if (mode == ASK_VGA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			mode = mode_menu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		if (!set_mode(mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		printf("Undefined video mode number: %x\n", mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		mode = ASK_VGA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	boot_params.hdr.vid_mode = mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	vesa_store_edid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	store_mode_params();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	if (do_restore)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		restore_screen();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }