/* * linux/drivers/video/vgacon.c -- Low level VGA based console driver * * Created 28 Sep 1997 by Geert Uytterhoeven * * Rewritten by Martin Mares <[email protected]>, July 1998 * * This file is based on the old console.c, vga.c and vesa_blank.c drivers. * * Copyright (C) 1991, 1992 Linus Torvalds * 1995 Jay Estabrook * * User definable mapping table and font loading by Eugene G. Crosser, * <[email protected]> * * Improved loadable font/UTF-8 support by H. Peter Anvin * Feb-Sep 1995 <[email protected]> * * Colour palette handling, by Simon Tatham * 17-Jun-95 <[email protected]> * * if 512 char mode is already enabled don't re-enable it, * because it causes screen to flicker, by Mitja Horvat * 5-May-96 <[email protected]> * * Use 2 outw instead of 4 outb_p to reduce erroneous text * flashing on RHS of screen during heavy console scrolling . * Oct 1996, Paul Gortmaker. * * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive for * more details. */ #include <linux/module.h> #include <linux/types.h> #include <linux/fs.h> #include <linux/kernel.h> #include <linux/console.h> #include <linux/string.h> #include <linux/kd.h> #include <linux/slab.h> #include <linux/vt_kern.h> #include <linux/sched.h> #include <linux/selection.h> #include <linux/spinlock.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/screen_info.h> #include <video/vga.h> #include <asm/io.h> static DEFINE_RAW_SPINLOCK(vga_lock); static int cursor_size_lastfrom; static int cursor_size_lastto; static u32 vgacon_xres; static u32 vgacon_yres; static struct vgastate vgastate; #define BLANK … #define VGA_FONTWIDTH … /* * Interface used by the world */ static bool vgacon_set_origin(struct vc_data *c); static struct uni_pagedict *vgacon_uni_pagedir; static int vgacon_refcount; /* Description of the hardware situation */ static unsigned long vga_vram_base __read_mostly; /* Base of video memory */ static unsigned long vga_vram_end __read_mostly; /* End of video memory */ static unsigned int vga_vram_size __read_mostly; /* Size of video memory */ static u16 vga_video_port_reg __read_mostly; /* Video register select port */ static u16 vga_video_port_val __read_mostly; /* Video register value port */ static unsigned int vga_video_num_columns; /* Number of text columns */ static unsigned int vga_video_num_lines; /* Number of text lines */ static bool vga_can_do_color; /* Do we support colors? */ static unsigned int vga_default_font_height __read_mostly; /* Height of default screen font */ static unsigned char vga_video_type __read_mostly; /* Card type */ static enum vesa_blank_mode vga_vesa_blanked; static bool vga_palette_blanked; static bool vga_is_gfx; static bool vga_512_chars; static int vga_video_font_height; static int vga_scan_lines __read_mostly; static unsigned int vga_rolled_over; /* last vc_origin offset before wrap */ static struct screen_info *vga_si; static bool vga_hardscroll_enabled; static bool vga_hardscroll_user_enable = …; static int __init no_scroll(char *str) { … } __setup(…); /* * By replacing the four outb_p with two back to back outw, we can reduce * the window of opportunity to see text mislocated to the RHS of the * console during heavy scrolling activity. However there is the remote * possibility that some pre-dinosaur hardware won't like the back to back * I/O. Since the Xservers get away with it, we should be able to as well. */ static inline void write_vga(unsigned char reg, unsigned int val) { … } static inline void vga_set_mem_top(struct vc_data *c) { … } static void vgacon_scrolldelta(struct vc_data *c, int lines) { … } static void vgacon_restore_screen(struct vc_data *c) { … } static const char *vgacon_startup(void) { … } static void vgacon_init(struct vc_data *c, bool init) { … } static void vgacon_deinit(struct vc_data *c) { … } static u8 vgacon_build_attr(struct vc_data *c, u8 color, enum vc_intensity intensity, bool blink, bool underline, bool reverse, bool italic) { … } static void vgacon_invert_region(struct vc_data *c, u16 * p, int count) { … } static void vgacon_set_cursor_size(int from, int to) { … } static void vgacon_cursor(struct vc_data *c, bool enable) { … } static void vgacon_doresize(struct vc_data *c, unsigned int width, unsigned int height) { … } static bool vgacon_switch(struct vc_data *c) { … } static void vga_set_palette(struct vc_data *vc, const unsigned char *table) { … } static void vgacon_set_palette(struct vc_data *vc, const unsigned char *table) { … } /* structure holding original VGA register settings */ static struct { … } vga_state; static void vga_vesa_blank(struct vgastate *state, enum vesa_blank_mode mode) { … } static void vga_vesa_unblank(struct vgastate *state) { … } static void vga_pal_blank(struct vgastate *state) { … } static bool vgacon_blank(struct vc_data *c, enum vesa_blank_mode blank, bool mode_switch) { … } /* * PIO_FONT support. * * The font loading code goes back to the codepage package by * Joel Hoffman ([email protected]). (He reports that the original * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2 * Video Systems_ by Richard Wilton. 1987. Microsoft Press".) * * Change for certain monochrome monitors by Yury Shevchuck * ([email protected]). */ #define colourmap … /* Pauline Middelink <[email protected]> reports that we should use 0xA0000 for the bwmap as well.. */ #define blackwmap … #define cmapsz … static int vgacon_do_font_op(struct vgastate *state, char *arg, int set, bool ch512) { … } /* * Adjust the screen to fit a font of a certain height */ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) { … } static int vgacon_font_set(struct vc_data *c, const struct console_font *font, unsigned int vpitch, unsigned int flags) { … } static int vgacon_font_get(struct vc_data *c, struct console_font *font, unsigned int vpitch) { … } static int vgacon_resize(struct vc_data *c, unsigned int width, unsigned int height, bool from_user) { … } static bool vgacon_set_origin(struct vc_data *c) { … } static void vgacon_save_screen(struct vc_data *c) { … } static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b, enum con_scroll dir, unsigned int lines) { … } /* * The console `switch' structure for the VGA based console */ static void vgacon_clear(struct vc_data *vc, unsigned int sy, unsigned int sx, unsigned int width) { … } static void vgacon_putcs(struct vc_data *vc, const u16 *s, unsigned int count, unsigned int ypos, unsigned int xpos) { … } const struct consw vga_con = …; EXPORT_SYMBOL(…); void vgacon_register_screen(struct screen_info *si) { … } MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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