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-rw-r--r--drivers/tty/vt/vt.c4851
1 files changed, 4851 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
new file mode 100644
index 000000000..981d2bfcf
--- /dev/null
+++ b/drivers/tty/vt/vt.c
@@ -0,0 +1,4851 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+/*
+ * Hopefully this will be a rather complete VT102 implementation.
+ *
+ * Beeping thanks to John T Kohl.
+ *
+ * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
+ * Chars, and VT100 enhancements by Peter MacDonald.
+ *
+ * Copy and paste function by Andrew Haylett,
+ * some enhancements by Alessandro Rubini.
+ *
+ * Code to check for different video-cards mostly by Galen Hunt,
+ * <g-hunt@ee.utah.edu>
+ *
+ * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
+ * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
+ *
+ * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
+ * Resizing of consoles, aeb, 940926
+ *
+ * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
+ * <poe@daimi.aau.dk>
+ *
+ * User-defined bell sound, new setterm control sequences and printk
+ * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
+ *
+ * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
+ *
+ * Merge with the abstract console driver by Geert Uytterhoeven
+ * <geert@linux-m68k.org>, Jan 1997.
+ *
+ * Original m68k console driver modifications by
+ *
+ * - Arno Griffioen <arno@usn.nl>
+ * - David Carter <carter@cs.bris.ac.uk>
+ *
+ * The abstract console driver provides a generic interface for a text
+ * console. It supports VGA text mode, frame buffer based graphical consoles
+ * and special graphics processors that are only accessible through some
+ * registers (e.g. a TMS340x0 GSP).
+ *
+ * The interface to the hardware is specified using a special structure
+ * (struct consw) which contains function pointers to console operations
+ * (see <linux/console.h> for more information).
+ *
+ * Support for changeable cursor shape
+ * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
+ *
+ * Ported to i386 and con_scrolldelta fixed
+ * by Emmanuel Marty <core@ggi-project.org>, April 1998
+ *
+ * Resurrected character buffers in videoram plus lots of other trickery
+ * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
+ *
+ * Removed old-style timers, introduced console_timer, made timer
+ * deletion SMP-safe. 17Jun00, Andrew Morton
+ *
+ * Removed console_lock, enabled interrupts across all console operations
+ * 13 March 2001, Andrew Morton
+ *
+ * Fixed UTF-8 mode so alternate charset modes always work according
+ * to control sequences interpreted in do_con_trol function
+ * preserving backward VT100 semigraphics compatibility,
+ * malformed UTF sequences represented as sequences of replacement glyphs,
+ * original codes or '?' as a last resort if replacement glyph is undefined
+ * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/sched/signal.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/kd.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/vt_kern.h>
+#include <linux/selection.h>
+#include <linux/tiocl.h>
+#include <linux/kbd_kern.h>
+#include <linux/consolemap.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/pm.h>
+#include <linux/font.h>
+#include <linux/bitops.h>
+#include <linux/notifier.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include <linux/ctype.h>
+#include <linux/bsearch.h>
+#include <linux/gcd.h>
+
+#define MAX_NR_CON_DRIVER 16
+
+#define CON_DRIVER_FLAG_MODULE 1
+#define CON_DRIVER_FLAG_INIT 2
+#define CON_DRIVER_FLAG_ATTR 4
+#define CON_DRIVER_FLAG_ZOMBIE 8
+
+struct con_driver {
+ const struct consw *con;
+ const char *desc;
+ struct device *dev;
+ int node;
+ int first;
+ int last;
+ int flag;
+};
+
+static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
+const struct consw *conswitchp;
+
+/*
+ * Here is the default bell parameters: 750HZ, 1/8th of a second
+ */
+#define DEFAULT_BELL_PITCH 750
+#define DEFAULT_BELL_DURATION (HZ/8)
+#define DEFAULT_CURSOR_BLINK_MS 200
+
+struct vc vc_cons [MAX_NR_CONSOLES];
+
+#ifndef VT_SINGLE_DRIVER
+static const struct consw *con_driver_map[MAX_NR_CONSOLES];
+#endif
+
+static int con_open(struct tty_struct *, struct file *);
+static void vc_init(struct vc_data *vc, unsigned int rows,
+ unsigned int cols, int do_clear);
+static void gotoxy(struct vc_data *vc, int new_x, int new_y);
+static void save_cur(struct vc_data *vc);
+static void reset_terminal(struct vc_data *vc, int do_clear);
+static void con_flush_chars(struct tty_struct *tty);
+static int set_vesa_blanking(char __user *p);
+static void set_cursor(struct vc_data *vc);
+static void hide_cursor(struct vc_data *vc);
+static void console_callback(struct work_struct *ignored);
+static void con_driver_unregister_callback(struct work_struct *ignored);
+static void blank_screen_t(struct timer_list *unused);
+static void set_palette(struct vc_data *vc);
+static void unblank_screen(void);
+
+#define vt_get_kmsg_redirect() vt_kmsg_redirect(-1)
+
+int default_utf8 = true;
+module_param(default_utf8, int, S_IRUGO | S_IWUSR);
+int global_cursor_default = -1;
+module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
+
+static int cur_default = CUR_UNDERLINE;
+module_param(cur_default, int, S_IRUGO | S_IWUSR);
+
+/*
+ * ignore_poke: don't unblank the screen when things are typed. This is
+ * mainly for the privacy of braille terminal users.
+ */
+static int ignore_poke;
+
+int do_poke_blanked_console;
+int console_blanked;
+
+static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
+static int vesa_off_interval;
+static int blankinterval;
+core_param(consoleblank, blankinterval, int, 0444);
+
+static DECLARE_WORK(console_work, console_callback);
+static DECLARE_WORK(con_driver_unregister_work, con_driver_unregister_callback);
+
+/*
+ * fg_console is the current virtual console,
+ * last_console is the last used one,
+ * want_console is the console we want to switch to,
+ * saved_* variants are for save/restore around kernel debugger enter/leave
+ */
+int fg_console;
+int last_console;
+int want_console = -1;
+static int saved_fg_console;
+static int saved_last_console;
+static int saved_want_console;
+static int saved_vc_mode;
+static int saved_console_blanked;
+
+/*
+ * For each existing display, we have a pointer to console currently visible
+ * on that display, allowing consoles other than fg_console to be refreshed
+ * appropriately. Unless the low-level driver supplies its own display_fg
+ * variable, we use this one for the "master display".
+ */
+static struct vc_data *master_display_fg;
+
+/*
+ * Unfortunately, we need to delay tty echo when we're currently writing to the
+ * console since the code is (and always was) not re-entrant, so we schedule
+ * all flip requests to process context with schedule-task() and run it from
+ * console_callback().
+ */
+
+/*
+ * For the same reason, we defer scrollback to the console callback.
+ */
+static int scrollback_delta;
+
+/*
+ * Hook so that the power management routines can (un)blank
+ * the console on our behalf.
+ */
+int (*console_blank_hook)(int);
+
+static DEFINE_TIMER(console_timer, blank_screen_t);
+static int blank_state;
+static int blank_timer_expired;
+enum {
+ blank_off = 0,
+ blank_normal_wait,
+ blank_vesa_wait,
+};
+
+/*
+ * /sys/class/tty/tty0/
+ *
+ * the attribute 'active' contains the name of the current vc
+ * console and it supports poll() to detect vc switches
+ */
+static struct device *tty0dev;
+
+/*
+ * Notifier list for console events.
+ */
+static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
+
+int register_vt_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_vt_notifier);
+
+int unregister_vt_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_vt_notifier);
+
+static void notify_write(struct vc_data *vc, unsigned int unicode)
+{
+ struct vt_notifier_param param = { .vc = vc, .c = unicode };
+ atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
+}
+
+static void notify_update(struct vc_data *vc)
+{
+ struct vt_notifier_param param = { .vc = vc };
+ atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
+}
+/*
+ * Low-Level Functions
+ */
+
+static inline bool con_is_fg(const struct vc_data *vc)
+{
+ return vc->vc_num == fg_console;
+}
+
+static inline bool con_should_update(const struct vc_data *vc)
+{
+ return con_is_visible(vc) && !console_blanked;
+}
+
+static inline unsigned short *screenpos(const struct vc_data *vc, int offset,
+ bool viewed)
+{
+ unsigned short *p;
+
+ if (!viewed)
+ p = (unsigned short *)(vc->vc_origin + offset);
+ else if (!vc->vc_sw->con_screen_pos)
+ p = (unsigned short *)(vc->vc_visible_origin + offset);
+ else
+ p = vc->vc_sw->con_screen_pos(vc, offset);
+ return p;
+}
+
+/* Called from the keyboard irq path.. */
+static inline void scrolldelta(int lines)
+{
+ /* FIXME */
+ /* scrolldelta needs some kind of consistency lock, but the BKL was
+ and still is not protecting versus the scheduled back end */
+ scrollback_delta += lines;
+ schedule_console_callback();
+}
+
+void schedule_console_callback(void)
+{
+ schedule_work(&console_work);
+}
+
+/*
+ * Code to manage unicode-based screen buffers
+ */
+
+#ifdef NO_VC_UNI_SCREEN
+/* this disables and optimizes related code away at compile time */
+#define get_vc_uniscr(vc) NULL
+#else
+#define get_vc_uniscr(vc) vc->vc_uni_screen
+#endif
+
+#define VC_UNI_SCREEN_DEBUG 0
+
+typedef uint32_t char32_t;
+
+/*
+ * Our screen buffer is preceded by an array of line pointers so that
+ * scrolling only implies some pointer shuffling.
+ */
+struct uni_screen {
+ char32_t *lines[0];
+};
+
+static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
+{
+ struct uni_screen *uniscr;
+ void *p;
+ unsigned int memsize, i;
+
+ /* allocate everything in one go */
+ memsize = cols * rows * sizeof(char32_t);
+ memsize += rows * sizeof(char32_t *);
+ p = vzalloc(memsize);
+ if (!p)
+ return NULL;
+
+ /* initial line pointers */
+ uniscr = p;
+ p = uniscr->lines + rows;
+ for (i = 0; i < rows; i++) {
+ uniscr->lines[i] = p;
+ p += cols * sizeof(char32_t);
+ }
+ return uniscr;
+}
+
+static void vc_uniscr_free(struct uni_screen *uniscr)
+{
+ vfree(uniscr);
+}
+
+static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
+{
+ vc_uniscr_free(vc->vc_uni_screen);
+ vc->vc_uni_screen = new_uniscr;
+}
+
+static void vc_uniscr_putc(struct vc_data *vc, char32_t uc)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr)
+ uniscr->lines[vc->state.y][vc->state.x] = uc;
+}
+
+static void vc_uniscr_insert(struct vc_data *vc, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->state.y];
+ unsigned int x = vc->state.x, cols = vc->vc_cols;
+
+ memmove(&ln[x + nr], &ln[x], (cols - x - nr) * sizeof(*ln));
+ memset32(&ln[x], ' ', nr);
+ }
+}
+
+static void vc_uniscr_delete(struct vc_data *vc, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->state.y];
+ unsigned int x = vc->state.x, cols = vc->vc_cols;
+
+ memcpy(&ln[x], &ln[x + nr], (cols - x - nr) * sizeof(*ln));
+ memset32(&ln[cols - nr], ' ', nr);
+ }
+}
+
+static void vc_uniscr_clear_line(struct vc_data *vc, unsigned int x,
+ unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ char32_t *ln = uniscr->lines[vc->state.y];
+
+ memset32(&ln[x], ' ', nr);
+ }
+}
+
+static void vc_uniscr_clear_lines(struct vc_data *vc, unsigned int y,
+ unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ unsigned int cols = vc->vc_cols;
+
+ while (nr--)
+ memset32(uniscr->lines[y++], ' ', cols);
+ }
+}
+
+static void vc_uniscr_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
+ enum con_scroll dir, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr) {
+ unsigned int i, j, k, sz, d, clear;
+
+ sz = b - t;
+ clear = b - nr;
+ d = nr;
+ if (dir == SM_DOWN) {
+ clear = t;
+ d = sz - nr;
+ }
+ for (i = 0; i < gcd(d, sz); i++) {
+ char32_t *tmp = uniscr->lines[t + i];
+ j = i;
+ while (1) {
+ k = j + d;
+ if (k >= sz)
+ k -= sz;
+ if (k == i)
+ break;
+ uniscr->lines[t + j] = uniscr->lines[t + k];
+ j = k;
+ }
+ uniscr->lines[t + j] = tmp;
+ }
+ vc_uniscr_clear_lines(vc, clear, nr);
+ }
+}
+
+static void vc_uniscr_copy_area(struct uni_screen *dst,
+ unsigned int dst_cols,
+ unsigned int dst_rows,
+ struct uni_screen *src,
+ unsigned int src_cols,
+ unsigned int src_top_row,
+ unsigned int src_bot_row)
+{
+ unsigned int dst_row = 0;
+
+ if (!dst)
+ return;
+
+ while (src_top_row < src_bot_row) {
+ char32_t *src_line = src->lines[src_top_row];
+ char32_t *dst_line = dst->lines[dst_row];
+
+ memcpy(dst_line, src_line, src_cols * sizeof(char32_t));
+ if (dst_cols - src_cols)
+ memset32(dst_line + src_cols, ' ', dst_cols - src_cols);
+ src_top_row++;
+ dst_row++;
+ }
+ while (dst_row < dst_rows) {
+ char32_t *dst_line = dst->lines[dst_row];
+
+ memset32(dst_line, ' ', dst_cols);
+ dst_row++;
+ }
+}
+
+/*
+ * Called from vcs_read() to make sure unicode screen retrieval is possible.
+ * This will initialize the unicode screen buffer if not already done.
+ * This returns 0 if OK, or a negative error code otherwise.
+ * In particular, -ENODATA is returned if the console is not in UTF-8 mode.
+ */
+int vc_uniscr_check(struct vc_data *vc)
+{
+ struct uni_screen *uniscr;
+ unsigned short *p;
+ int x, y, mask;
+
+ if (__is_defined(NO_VC_UNI_SCREEN))
+ return -EOPNOTSUPP;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (!vc->vc_utf)
+ return -ENODATA;
+
+ if (vc->vc_uni_screen)
+ return 0;
+
+ uniscr = vc_uniscr_alloc(vc->vc_cols, vc->vc_rows);
+ if (!uniscr)
+ return -ENOMEM;
+
+ /*
+ * Let's populate it initially with (imperfect) reverse translation.
+ * This is the next best thing we can do short of having it enabled
+ * from the start even when no users rely on this functionality. True
+ * unicode content will be available after a complete screen refresh.
+ */
+ p = (unsigned short *)vc->vc_origin;
+ mask = vc->vc_hi_font_mask | 0xff;
+ for (y = 0; y < vc->vc_rows; y++) {
+ char32_t *line = uniscr->lines[y];
+ for (x = 0; x < vc->vc_cols; x++) {
+ u16 glyph = scr_readw(p++) & mask;
+ line[x] = inverse_translate(vc, glyph, true);
+ }
+ }
+
+ vc->vc_uni_screen = uniscr;
+ return 0;
+}
+
+/*
+ * Called from vcs_read() to get the unicode data from the screen.
+ * This must be preceded by a successful call to vc_uniscr_check() once
+ * the console lock has been taken.
+ */
+void vc_uniscr_copy_line(const struct vc_data *vc, void *dest, bool viewed,
+ unsigned int row, unsigned int col, unsigned int nr)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+ int offset = row * vc->vc_size_row + col * 2;
+ unsigned long pos;
+
+ BUG_ON(!uniscr);
+
+ pos = (unsigned long)screenpos(vc, offset, viewed);
+ if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
+ /*
+ * Desired position falls in the main screen buffer.
+ * However the actual row/col might be different if
+ * scrollback is active.
+ */
+ row = (pos - vc->vc_origin) / vc->vc_size_row;
+ col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
+ memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
+ } else {
+ /*
+ * Scrollback is active. For now let's simply backtranslate
+ * the screen glyphs until the unicode screen buffer does
+ * synchronize with console display drivers for a scrollback
+ * buffer of its own.
+ */
+ u16 *p = (u16 *)pos;
+ int mask = vc->vc_hi_font_mask | 0xff;
+ char32_t *uni_buf = dest;
+ while (nr--) {
+ u16 glyph = scr_readw(p++) & mask;
+ *uni_buf++ = inverse_translate(vc, glyph, true);
+ }
+ }
+}
+
+/* this is for validation and debugging only */
+static void vc_uniscr_debug_check(struct vc_data *vc)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+ unsigned short *p;
+ int x, y, mask;
+
+ if (!VC_UNI_SCREEN_DEBUG || !uniscr)
+ return;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ /*
+ * Make sure our unicode screen translates into the same glyphs
+ * as the actual screen. This is brutal indeed.
+ */
+ p = (unsigned short *)vc->vc_origin;
+ mask = vc->vc_hi_font_mask | 0xff;
+ for (y = 0; y < vc->vc_rows; y++) {
+ char32_t *line = uniscr->lines[y];
+ for (x = 0; x < vc->vc_cols; x++) {
+ u16 glyph = scr_readw(p++) & mask;
+ char32_t uc = line[x];
+ int tc = conv_uni_to_pc(vc, uc);
+ if (tc == -4)
+ tc = conv_uni_to_pc(vc, 0xfffd);
+ if (tc == -4)
+ tc = conv_uni_to_pc(vc, '?');
+ if (tc != glyph)
+ pr_err_ratelimited(
+ "%s: mismatch at %d,%d: glyph=%#x tc=%#x\n",
+ __func__, x, y, glyph, tc);
+ }
+ }
+}
+
+
+static void con_scroll(struct vc_data *vc, unsigned int t, unsigned int b,
+ enum con_scroll dir, unsigned int nr)
+{
+ u16 *clear, *d, *s;
+
+ if (t + nr >= b)
+ nr = b - t - 1;
+ if (b > vc->vc_rows || t >= b || nr < 1)
+ return;
+ vc_uniscr_scroll(vc, t, b, dir, nr);
+ if (con_is_visible(vc) && vc->vc_sw->con_scroll(vc, t, b, dir, nr))
+ return;
+
+ s = clear = (u16 *)(vc->vc_origin + vc->vc_size_row * t);
+ d = (u16 *)(vc->vc_origin + vc->vc_size_row * (t + nr));
+
+ if (dir == SM_UP) {
+ clear = s + (b - t - nr) * vc->vc_cols;
+ swap(s, d);
+ }
+ scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
+ scr_memsetw(clear, vc->vc_video_erase_char, vc->vc_size_row * nr);
+}
+
+static void do_update_region(struct vc_data *vc, unsigned long start, int count)
+{
+ unsigned int xx, yy, offset;
+ u16 *p;
+
+ p = (u16 *) start;
+ if (!vc->vc_sw->con_getxy) {
+ offset = (start - vc->vc_origin) / 2;
+ xx = offset % vc->vc_cols;
+ yy = offset / vc->vc_cols;
+ } else {
+ int nxx, nyy;
+ start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
+ xx = nxx; yy = nyy;
+ }
+ for(;;) {
+ u16 attrib = scr_readw(p) & 0xff00;
+ int startx = xx;
+ u16 *q = p;
+ while (xx < vc->vc_cols && count) {
+ if (attrib != (scr_readw(p) & 0xff00)) {
+ if (p > q)
+ vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+ startx = xx;
+ q = p;
+ attrib = scr_readw(p) & 0xff00;
+ }
+ p++;
+ xx++;
+ count--;
+ }
+ if (p > q)
+ vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
+ if (!count)
+ break;
+ xx = 0;
+ yy++;
+ if (vc->vc_sw->con_getxy) {
+ p = (u16 *)start;
+ start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
+ }
+ }
+}
+
+void update_region(struct vc_data *vc, unsigned long start, int count)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ if (con_should_update(vc)) {
+ hide_cursor(vc);
+ do_update_region(vc, start, count);
+ set_cursor(vc);
+ }
+}
+
+/* Structure of attributes is hardware-dependent */
+
+static u8 build_attr(struct vc_data *vc, u8 _color,
+ enum vc_intensity _intensity, bool _blink, bool _underline,
+ bool _reverse, bool _italic)
+{
+ if (vc->vc_sw->con_build_attr)
+ return vc->vc_sw->con_build_attr(vc, _color, _intensity,
+ _blink, _underline, _reverse, _italic);
+
+/*
+ * ++roman: I completely changed the attribute format for monochrome
+ * mode (!can_do_color). The formerly used MDA (monochrome display
+ * adapter) format didn't allow the combination of certain effects.
+ * Now the attribute is just a bit vector:
+ * Bit 0..1: intensity (0..2)
+ * Bit 2 : underline
+ * Bit 3 : reverse
+ * Bit 7 : blink
+ */
+ {
+ u8 a = _color;
+ if (!vc->vc_can_do_color)
+ return _intensity |
+ (_italic << 1) |
+ (_underline << 2) |
+ (_reverse << 3) |
+ (_blink << 7);
+ if (_italic)
+ a = (a & 0xF0) | vc->vc_itcolor;
+ else if (_underline)
+ a = (a & 0xf0) | vc->vc_ulcolor;
+ else if (_intensity == VCI_HALF_BRIGHT)
+ a = (a & 0xf0) | vc->vc_halfcolor;
+ if (_reverse)
+ a = (a & 0x88) | (((a >> 4) | (a << 4)) & 0x77);
+ if (_blink)
+ a ^= 0x80;
+ if (_intensity == VCI_BOLD)
+ a ^= 0x08;
+ if (vc->vc_hi_font_mask == 0x100)
+ a <<= 1;
+ return a;
+ }
+}
+
+static void update_attr(struct vc_data *vc)
+{
+ vc->vc_attr = build_attr(vc, vc->state.color, vc->state.intensity,
+ vc->state.blink, vc->state.underline,
+ vc->state.reverse ^ vc->vc_decscnm, vc->state.italic);
+ vc->vc_video_erase_char = ' ' | (build_attr(vc, vc->state.color,
+ VCI_NORMAL, vc->state.blink, false,
+ vc->vc_decscnm, false) << 8);
+}
+
+/* Note: inverting the screen twice should revert to the original state */
+void invert_screen(struct vc_data *vc, int offset, int count, bool viewed)
+{
+ unsigned short *p;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ count /= 2;
+ p = screenpos(vc, offset, viewed);
+ if (vc->vc_sw->con_invert_region) {
+ vc->vc_sw->con_invert_region(vc, p, count);
+ } else {
+ u16 *q = p;
+ int cnt = count;
+ u16 a;
+
+ if (!vc->vc_can_do_color) {
+ while (cnt--) {
+ a = scr_readw(q);
+ a ^= 0x0800;
+ scr_writew(a, q);
+ q++;
+ }
+ } else if (vc->vc_hi_font_mask == 0x100) {
+ while (cnt--) {
+ a = scr_readw(q);
+ a = (a & 0x11ff) |
+ ((a & 0xe000) >> 4) |
+ ((a & 0x0e00) << 4);
+ scr_writew(a, q);
+ q++;
+ }
+ } else {
+ while (cnt--) {
+ a = scr_readw(q);
+ a = (a & 0x88ff) |
+ ((a & 0x7000) >> 4) |
+ ((a & 0x0700) << 4);
+ scr_writew(a, q);
+ q++;
+ }
+ }
+ }
+
+ if (con_should_update(vc))
+ do_update_region(vc, (unsigned long) p, count);
+ notify_update(vc);
+}
+
+/* used by selection: complement pointer position */
+void complement_pos(struct vc_data *vc, int offset)
+{
+ static int old_offset = -1;
+ static unsigned short old;
+ static unsigned short oldx, oldy;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (old_offset != -1 && old_offset >= 0 &&
+ old_offset < vc->vc_screenbuf_size) {
+ scr_writew(old, screenpos(vc, old_offset, true));
+ if (con_should_update(vc))
+ vc->vc_sw->con_putc(vc, old, oldy, oldx);
+ notify_update(vc);
+ }
+
+ old_offset = offset;
+
+ if (offset != -1 && offset >= 0 &&
+ offset < vc->vc_screenbuf_size) {
+ unsigned short new;
+ unsigned short *p;
+ p = screenpos(vc, offset, true);
+ old = scr_readw(p);
+ new = old ^ vc->vc_complement_mask;
+ scr_writew(new, p);
+ if (con_should_update(vc)) {
+ oldx = (offset >> 1) % vc->vc_cols;
+ oldy = (offset >> 1) / vc->vc_cols;
+ vc->vc_sw->con_putc(vc, new, oldy, oldx);
+ }
+ notify_update(vc);
+ }
+}
+
+static void insert_char(struct vc_data *vc, unsigned int nr)
+{
+ unsigned short *p = (unsigned short *) vc->vc_pos;
+
+ vc_uniscr_insert(vc, nr);
+ scr_memmovew(p + nr, p, (vc->vc_cols - vc->state.x - nr) * 2);
+ scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
+ vc->vc_need_wrap = 0;
+ if (con_should_update(vc))
+ do_update_region(vc, (unsigned long) p,
+ vc->vc_cols - vc->state.x);
+}
+
+static void delete_char(struct vc_data *vc, unsigned int nr)
+{
+ unsigned short *p = (unsigned short *) vc->vc_pos;
+
+ vc_uniscr_delete(vc, nr);
+ scr_memmovew(p, p + nr, (vc->vc_cols - vc->state.x - nr) * 2);
+ scr_memsetw(p + vc->vc_cols - vc->state.x - nr, vc->vc_video_erase_char,
+ nr * 2);
+ vc->vc_need_wrap = 0;
+ if (con_should_update(vc))
+ do_update_region(vc, (unsigned long) p,
+ vc->vc_cols - vc->state.x);
+}
+
+static int softcursor_original = -1;
+
+static void add_softcursor(struct vc_data *vc)
+{
+ int i = scr_readw((u16 *) vc->vc_pos);
+ u32 type = vc->vc_cursor_type;
+
+ if (!(type & CUR_SW))
+ return;
+ if (softcursor_original != -1)
+ return;
+ softcursor_original = i;
+ i |= CUR_SET(type);
+ i ^= CUR_CHANGE(type);
+ if ((type & CUR_ALWAYS_BG) &&
+ (softcursor_original & CUR_BG) == (i & CUR_BG))
+ i ^= CUR_BG;
+ if ((type & CUR_INVERT_FG_BG) && (i & CUR_FG) == ((i & CUR_BG) >> 4))
+ i ^= CUR_FG;
+ scr_writew(i, (u16 *)vc->vc_pos);
+ if (con_should_update(vc))
+ vc->vc_sw->con_putc(vc, i, vc->state.y, vc->state.x);
+}
+
+static void hide_softcursor(struct vc_data *vc)
+{
+ if (softcursor_original != -1) {
+ scr_writew(softcursor_original, (u16 *)vc->vc_pos);
+ if (con_should_update(vc))
+ vc->vc_sw->con_putc(vc, softcursor_original,
+ vc->state.y, vc->state.x);
+ softcursor_original = -1;
+ }
+}
+
+static void hide_cursor(struct vc_data *vc)
+{
+ if (vc_is_sel(vc))
+ clear_selection();
+
+ vc->vc_sw->con_cursor(vc, CM_ERASE);
+ hide_softcursor(vc);
+}
+
+static void set_cursor(struct vc_data *vc)
+{
+ if (!con_is_fg(vc) || console_blanked || vc->vc_mode == KD_GRAPHICS)
+ return;
+ if (vc->vc_deccm) {
+ if (vc_is_sel(vc))
+ clear_selection();
+ add_softcursor(vc);
+ if (CUR_SIZE(vc->vc_cursor_type) != CUR_NONE)
+ vc->vc_sw->con_cursor(vc, CM_DRAW);
+ } else
+ hide_cursor(vc);
+}
+
+static void set_origin(struct vc_data *vc)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ if (!con_is_visible(vc) ||
+ !vc->vc_sw->con_set_origin ||
+ !vc->vc_sw->con_set_origin(vc))
+ vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+ vc->vc_visible_origin = vc->vc_origin;
+ vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
+ vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->state.y +
+ 2 * vc->state.x;
+}
+
+static void save_screen(struct vc_data *vc)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ if (vc->vc_sw->con_save_screen)
+ vc->vc_sw->con_save_screen(vc);
+}
+
+static void flush_scrollback(struct vc_data *vc)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ set_origin(vc);
+ if (vc->vc_sw->con_flush_scrollback) {
+ vc->vc_sw->con_flush_scrollback(vc);
+ } else if (con_is_visible(vc)) {
+ /*
+ * When no con_flush_scrollback method is provided then the
+ * legacy way for flushing the scrollback buffer is to use
+ * a side effect of the con_switch method. We do it only on
+ * the foreground console as background consoles have no
+ * scrollback buffers in that case and we obviously don't
+ * want to switch to them.
+ */
+ hide_cursor(vc);
+ vc->vc_sw->con_switch(vc);
+ set_cursor(vc);
+ }
+}
+
+/*
+ * Redrawing of screen
+ */
+
+void clear_buffer_attributes(struct vc_data *vc)
+{
+ unsigned short *p = (unsigned short *)vc->vc_origin;
+ int count = vc->vc_screenbuf_size / 2;
+ int mask = vc->vc_hi_font_mask | 0xff;
+
+ for (; count > 0; count--, p++) {
+ scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
+ }
+}
+
+void redraw_screen(struct vc_data *vc, int is_switch)
+{
+ int redraw = 0;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (!vc) {
+ /* strange ... */
+ /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
+ return;
+ }
+
+ if (is_switch) {
+ struct vc_data *old_vc = vc_cons[fg_console].d;
+ if (old_vc == vc)
+ return;
+ if (!con_is_visible(vc))
+ redraw = 1;
+ *vc->vc_display_fg = vc;
+ fg_console = vc->vc_num;
+ hide_cursor(old_vc);
+ if (!con_is_visible(old_vc)) {
+ save_screen(old_vc);
+ set_origin(old_vc);
+ }
+ if (tty0dev)
+ sysfs_notify(&tty0dev->kobj, NULL, "active");
+ } else {
+ hide_cursor(vc);
+ redraw = 1;
+ }
+
+ if (redraw) {
+ int update;
+ int old_was_color = vc->vc_can_do_color;
+
+ set_origin(vc);
+ update = vc->vc_sw->con_switch(vc);
+ set_palette(vc);
+ /*
+ * If console changed from mono<->color, the best we can do
+ * is to clear the buffer attributes. As it currently stands,
+ * rebuilding new attributes from the old buffer is not doable
+ * without overly complex code.
+ */
+ if (old_was_color != vc->vc_can_do_color) {
+ update_attr(vc);
+ clear_buffer_attributes(vc);
+ }
+
+ if (update && vc->vc_mode != KD_GRAPHICS)
+ do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+ }
+ set_cursor(vc);
+ if (is_switch) {
+ vt_set_leds_compute_shiftstate();
+ notify_update(vc);
+ }
+}
+
+/*
+ * Allocation, freeing and resizing of VTs.
+ */
+
+int vc_cons_allocated(unsigned int i)
+{
+ return (i < MAX_NR_CONSOLES && vc_cons[i].d);
+}
+
+static void visual_init(struct vc_data *vc, int num, int init)
+{
+ /* ++Geert: vc->vc_sw->con_init determines console size */
+ if (vc->vc_sw)
+ module_put(vc->vc_sw->owner);
+ vc->vc_sw = conswitchp;
+#ifndef VT_SINGLE_DRIVER
+ if (con_driver_map[num])
+ vc->vc_sw = con_driver_map[num];
+#endif
+ __module_get(vc->vc_sw->owner);
+ vc->vc_num = num;
+ vc->vc_display_fg = &master_display_fg;
+ if (vc->uni_pagedict_loc)
+ con_free_unimap(vc);
+ vc->uni_pagedict_loc = &vc->uni_pagedict;
+ vc->uni_pagedict = NULL;
+ vc->vc_hi_font_mask = 0;
+ vc->vc_complement_mask = 0;
+ vc->vc_can_do_color = 0;
+ vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
+ vc->vc_sw->con_init(vc, init);
+ if (!vc->vc_complement_mask)
+ vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
+ vc->vc_s_complement_mask = vc->vc_complement_mask;
+ vc->vc_size_row = vc->vc_cols << 1;
+ vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+}
+
+
+static void visual_deinit(struct vc_data *vc)
+{
+ vc->vc_sw->con_deinit(vc);
+ module_put(vc->vc_sw->owner);
+}
+
+static void vc_port_destruct(struct tty_port *port)
+{
+ struct vc_data *vc = container_of(port, struct vc_data, port);
+
+ kfree(vc);
+}
+
+static const struct tty_port_operations vc_port_ops = {
+ .destruct = vc_port_destruct,
+};
+
+/*
+ * Change # of rows and columns (0 means unchanged/the size of fg_console)
+ * [this is to be used together with some user program
+ * like resize that changes the hardware videomode]
+ */
+#define VC_MAXCOL (32767)
+#define VC_MAXROW (32767)
+
+int vc_allocate(unsigned int currcons) /* return 0 on success */
+{
+ struct vt_notifier_param param;
+ struct vc_data *vc;
+ int err;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (currcons >= MAX_NR_CONSOLES)
+ return -ENXIO;
+
+ if (vc_cons[currcons].d)
+ return 0;
+
+ /* due to the granularity of kmalloc, we waste some memory here */
+ /* the alloc is done in two steps, to optimize the common situation
+ of a 25x80 console (structsize=216, screenbuf_size=4000) */
+ /* although the numbers above are not valid since long ago, the
+ point is still up-to-date and the comment still has its value
+ even if only as a historical artifact. --mj, July 1998 */
+ param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
+ if (!vc)
+ return -ENOMEM;
+
+ vc_cons[currcons].d = vc;
+ tty_port_init(&vc->port);
+ vc->port.ops = &vc_port_ops;
+ INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+
+ visual_init(vc, currcons, 1);
+
+ if (!*vc->uni_pagedict_loc)
+ con_set_default_unimap(vc);
+
+ err = -EINVAL;
+ if (vc->vc_cols > VC_MAXCOL || vc->vc_rows > VC_MAXROW ||
+ vc->vc_screenbuf_size > KMALLOC_MAX_SIZE || !vc->vc_screenbuf_size)
+ goto err_free;
+ err = -ENOMEM;
+ vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_KERNEL);
+ if (!vc->vc_screenbuf)
+ goto err_free;
+
+ /* If no drivers have overridden us and the user didn't pass a
+ boot option, default to displaying the cursor */
+ if (global_cursor_default == -1)
+ global_cursor_default = 1;
+
+ vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
+ vcs_make_sysfs(currcons);
+ atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
+
+ return 0;
+err_free:
+ visual_deinit(vc);
+ kfree(vc);
+ vc_cons[currcons].d = NULL;
+ return err;
+}
+
+static inline int resize_screen(struct vc_data *vc, int width, int height,
+ int user)
+{
+ /* Resizes the resolution of the display adapater */
+ int err = 0;
+
+ if (vc->vc_sw->con_resize)
+ err = vc->vc_sw->con_resize(vc, width, height, user);
+
+ return err;
+}
+
+/**
+ * vc_do_resize - resizing method for the tty
+ * @tty: tty being resized
+ * @vc: virtual console private data
+ * @cols: columns
+ * @lines: lines
+ *
+ * Resize a virtual console, clipping according to the actual constraints.
+ * If the caller passes a tty structure then update the termios winsize
+ * information and perform any necessary signal handling.
+ *
+ * Caller must hold the console semaphore. Takes the termios rwsem and
+ * ctrl.lock of the tty IFF a tty is passed.
+ */
+
+static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
+ unsigned int cols, unsigned int lines)
+{
+ unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
+ unsigned long end;
+ unsigned int old_rows, old_row_size, first_copied_row;
+ unsigned int new_cols, new_rows, new_row_size, new_screen_size;
+ unsigned int user;
+ unsigned short *oldscreen, *newscreen;
+ struct uni_screen *new_uniscr = NULL;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (!vc)
+ return -ENXIO;
+
+ user = vc->vc_resize_user;
+ vc->vc_resize_user = 0;
+
+ if (cols > VC_MAXCOL || lines > VC_MAXROW)
+ return -EINVAL;
+
+ new_cols = (cols ? cols : vc->vc_cols);
+ new_rows = (lines ? lines : vc->vc_rows);
+ new_row_size = new_cols << 1;
+ new_screen_size = new_row_size * new_rows;
+
+ if (new_cols == vc->vc_cols && new_rows == vc->vc_rows) {
+ /*
+ * This function is being called here to cover the case
+ * where the userspace calls the FBIOPUT_VSCREENINFO twice,
+ * passing the same fb_var_screeninfo containing the fields
+ * yres/xres equal to a number non-multiple of vc_font.height
+ * and yres_virtual/xres_virtual equal to number lesser than the
+ * vc_font.height and yres/xres.
+ * In the second call, the struct fb_var_screeninfo isn't
+ * being modified by the underlying driver because of the
+ * if above, and this causes the fbcon_display->vrows to become
+ * negative and it eventually leads to out-of-bound
+ * access by the imageblit function.
+ * To give the correct values to the struct and to not have
+ * to deal with possible errors from the code below, we call
+ * the resize_screen here as well.
+ */
+ return resize_screen(vc, new_cols, new_rows, user);
+ }
+
+ if (new_screen_size > KMALLOC_MAX_SIZE || !new_screen_size)
+ return -EINVAL;
+ newscreen = kzalloc(new_screen_size, GFP_USER);
+ if (!newscreen)
+ return -ENOMEM;
+
+ if (get_vc_uniscr(vc)) {
+ new_uniscr = vc_uniscr_alloc(new_cols, new_rows);
+ if (!new_uniscr) {
+ kfree(newscreen);
+ return -ENOMEM;
+ }
+ }
+
+ if (vc_is_sel(vc))
+ clear_selection();
+
+ old_rows = vc->vc_rows;
+ old_row_size = vc->vc_size_row;
+
+ err = resize_screen(vc, new_cols, new_rows, user);
+ if (err) {
+ kfree(newscreen);
+ vc_uniscr_free(new_uniscr);
+ return err;
+ }
+
+ vc->vc_rows = new_rows;
+ vc->vc_cols = new_cols;
+ vc->vc_size_row = new_row_size;
+ vc->vc_screenbuf_size = new_screen_size;
+
+ rlth = min(old_row_size, new_row_size);
+ rrem = new_row_size - rlth;
+ old_origin = vc->vc_origin;
+ new_origin = (long) newscreen;
+ new_scr_end = new_origin + new_screen_size;
+
+ if (vc->state.y > new_rows) {
+ if (old_rows - vc->state.y < new_rows) {
+ /*
+ * Cursor near the bottom, copy contents from the
+ * bottom of buffer
+ */
+ first_copied_row = (old_rows - new_rows);
+ } else {
+ /*
+ * Cursor is in no man's land, copy 1/2 screenful
+ * from the top and bottom of cursor position
+ */
+ first_copied_row = (vc->state.y - new_rows/2);
+ }
+ old_origin += first_copied_row * old_row_size;
+ } else
+ first_copied_row = 0;
+ end = old_origin + old_row_size * min(old_rows, new_rows);
+
+ vc_uniscr_copy_area(new_uniscr, new_cols, new_rows,
+ get_vc_uniscr(vc), rlth/2, first_copied_row,
+ min(old_rows, new_rows));
+ vc_uniscr_set(vc, new_uniscr);
+
+ update_attr(vc);
+
+ while (old_origin < end) {
+ scr_memcpyw((unsigned short *) new_origin,
+ (unsigned short *) old_origin, rlth);
+ if (rrem)
+ scr_memsetw((void *)(new_origin + rlth),
+ vc->vc_video_erase_char, rrem);
+ old_origin += old_row_size;
+ new_origin += new_row_size;
+ }
+ if (new_scr_end > new_origin)
+ scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
+ new_scr_end - new_origin);
+ oldscreen = vc->vc_screenbuf;
+ vc->vc_screenbuf = newscreen;
+ vc->vc_screenbuf_size = new_screen_size;
+ set_origin(vc);
+ kfree(oldscreen);
+
+ /* do part of a reset_terminal() */
+ vc->vc_top = 0;
+ vc->vc_bottom = vc->vc_rows;
+ gotoxy(vc, vc->state.x, vc->state.y);
+ save_cur(vc);
+
+ if (tty) {
+ /* Rewrite the requested winsize data with the actual
+ resulting sizes */
+ struct winsize ws;
+ memset(&ws, 0, sizeof(ws));
+ ws.ws_row = vc->vc_rows;
+ ws.ws_col = vc->vc_cols;
+ ws.ws_ypixel = vc->vc_scan_lines;
+ tty_do_resize(tty, &ws);
+ }
+
+ if (con_is_visible(vc))
+ update_screen(vc);
+ vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
+ notify_update(vc);
+ return err;
+}
+
+/**
+ * vc_resize - resize a VT
+ * @vc: virtual console
+ * @cols: columns
+ * @rows: rows
+ *
+ * Resize a virtual console as seen from the console end of things. We
+ * use the common vc_do_resize methods to update the structures. The
+ * caller must hold the console sem to protect console internals and
+ * vc->port.tty
+ */
+
+int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
+{
+ return vc_do_resize(vc->port.tty, vc, cols, rows);
+}
+
+/**
+ * vt_resize - resize a VT
+ * @tty: tty to resize
+ * @ws: winsize attributes
+ *
+ * Resize a virtual terminal. This is called by the tty layer as we
+ * register our own handler for resizing. The mutual helper does all
+ * the actual work.
+ *
+ * Takes the console sem and the called methods then take the tty
+ * termios_rwsem and the tty ctrl.lock in that order.
+ */
+static int vt_resize(struct tty_struct *tty, struct winsize *ws)
+{
+ struct vc_data *vc = tty->driver_data;
+ int ret;
+
+ console_lock();
+ ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
+ console_unlock();
+ return ret;
+}
+
+struct vc_data *vc_deallocate(unsigned int currcons)
+{
+ struct vc_data *vc = NULL;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (vc_cons_allocated(currcons)) {
+ struct vt_notifier_param param;
+
+ param.vc = vc = vc_cons[currcons].d;
+ atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
+ vcs_remove_sysfs(currcons);
+ visual_deinit(vc);
+ con_free_unimap(vc);
+ put_pid(vc->vt_pid);
+ vc_uniscr_set(vc, NULL);
+ kfree(vc->vc_screenbuf);
+ vc_cons[currcons].d = NULL;
+ }
+ return vc;
+}
+
+/*
+ * VT102 emulator
+ */
+
+enum { EPecma = 0, EPdec, EPeq, EPgt, EPlt};
+
+#define set_kbd(vc, x) vt_set_kbd_mode_bit((vc)->vc_num, (x))
+#define clr_kbd(vc, x) vt_clr_kbd_mode_bit((vc)->vc_num, (x))
+#define is_kbd(vc, x) vt_get_kbd_mode_bit((vc)->vc_num, (x))
+
+#define decarm VC_REPEAT
+#define decckm VC_CKMODE
+#define kbdapplic VC_APPLIC
+#define lnm VC_CRLF
+
+const unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
+ 8,12,10,14, 9,13,11,15 };
+
+/* the default colour table, for VGA+ colour systems */
+unsigned char default_red[] = {
+ 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa, 0x00, 0xaa,
+ 0x55, 0xff, 0x55, 0xff, 0x55, 0xff, 0x55, 0xff
+};
+module_param_array(default_red, byte, NULL, S_IRUGO | S_IWUSR);
+
+unsigned char default_grn[] = {
+ 0x00, 0x00, 0xaa, 0x55, 0x00, 0x00, 0xaa, 0xaa,
+ 0x55, 0x55, 0xff, 0xff, 0x55, 0x55, 0xff, 0xff
+};
+module_param_array(default_grn, byte, NULL, S_IRUGO | S_IWUSR);
+
+unsigned char default_blu[] = {
+ 0x00, 0x00, 0x00, 0x00, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff
+};
+module_param_array(default_blu, byte, NULL, S_IRUGO | S_IWUSR);
+
+/*
+ * gotoxy() must verify all boundaries, because the arguments
+ * might also be negative. If the given position is out of
+ * bounds, the cursor is placed at the nearest margin.
+ */
+static void gotoxy(struct vc_data *vc, int new_x, int new_y)
+{
+ int min_y, max_y;
+
+ if (new_x < 0)
+ vc->state.x = 0;
+ else {
+ if (new_x >= vc->vc_cols)
+ vc->state.x = vc->vc_cols - 1;
+ else
+ vc->state.x = new_x;
+ }
+
+ if (vc->vc_decom) {
+ min_y = vc->vc_top;
+ max_y = vc->vc_bottom;
+ } else {
+ min_y = 0;
+ max_y = vc->vc_rows;
+ }
+ if (new_y < min_y)
+ vc->state.y = min_y;
+ else if (new_y >= max_y)
+ vc->state.y = max_y - 1;
+ else
+ vc->state.y = new_y;
+ vc->vc_pos = vc->vc_origin + vc->state.y * vc->vc_size_row +
+ (vc->state.x << 1);
+ vc->vc_need_wrap = 0;
+}
+
+/* for absolute user moves, when decom is set */
+static void gotoxay(struct vc_data *vc, int new_x, int new_y)
+{
+ gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
+}
+
+void scrollback(struct vc_data *vc)
+{
+ scrolldelta(-(vc->vc_rows / 2));
+}
+
+void scrollfront(struct vc_data *vc, int lines)
+{
+ if (!lines)
+ lines = vc->vc_rows / 2;
+ scrolldelta(lines);
+}
+
+static void lf(struct vc_data *vc)
+{
+ /* don't scroll if above bottom of scrolling region, or
+ * if below scrolling region
+ */
+ if (vc->state.y + 1 == vc->vc_bottom)
+ con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_UP, 1);
+ else if (vc->state.y < vc->vc_rows - 1) {
+ vc->state.y++;
+ vc->vc_pos += vc->vc_size_row;
+ }
+ vc->vc_need_wrap = 0;
+ notify_write(vc, '\n');
+}
+
+static void ri(struct vc_data *vc)
+{
+ /* don't scroll if below top of scrolling region, or
+ * if above scrolling region
+ */
+ if (vc->state.y == vc->vc_top)
+ con_scroll(vc, vc->vc_top, vc->vc_bottom, SM_DOWN, 1);
+ else if (vc->state.y > 0) {
+ vc->state.y--;
+ vc->vc_pos -= vc->vc_size_row;
+ }
+ vc->vc_need_wrap = 0;
+}
+
+static inline void cr(struct vc_data *vc)
+{
+ vc->vc_pos -= vc->state.x << 1;
+ vc->vc_need_wrap = vc->state.x = 0;
+ notify_write(vc, '\r');
+}
+
+static inline void bs(struct vc_data *vc)
+{
+ if (vc->state.x) {
+ vc->vc_pos -= 2;
+ vc->state.x--;
+ vc->vc_need_wrap = 0;
+ notify_write(vc, '\b');
+ }
+}
+
+static inline void del(struct vc_data *vc)
+{
+ /* ignored */
+}
+
+static void csi_J(struct vc_data *vc, int vpar)
+{
+ unsigned int count;
+ unsigned short * start;
+
+ switch (vpar) {
+ case 0: /* erase from cursor to end of display */
+ vc_uniscr_clear_line(vc, vc->state.x,
+ vc->vc_cols - vc->state.x);
+ vc_uniscr_clear_lines(vc, vc->state.y + 1,
+ vc->vc_rows - vc->state.y - 1);
+ count = (vc->vc_scr_end - vc->vc_pos) >> 1;
+ start = (unsigned short *)vc->vc_pos;
+ break;
+ case 1: /* erase from start to cursor */
+ vc_uniscr_clear_line(vc, 0, vc->state.x + 1);
+ vc_uniscr_clear_lines(vc, 0, vc->state.y);
+ count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
+ start = (unsigned short *)vc->vc_origin;
+ break;
+ case 3: /* include scrollback */
+ flush_scrollback(vc);
+ fallthrough;
+ case 2: /* erase whole display */
+ vc_uniscr_clear_lines(vc, 0, vc->vc_rows);
+ count = vc->vc_cols * vc->vc_rows;
+ start = (unsigned short *)vc->vc_origin;
+ break;
+ default:
+ return;
+ }
+ scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
+ if (con_should_update(vc))
+ do_update_region(vc, (unsigned long) start, count);
+ vc->vc_need_wrap = 0;
+}
+
+static void csi_K(struct vc_data *vc, int vpar)
+{
+ unsigned int count;
+ unsigned short *start = (unsigned short *)vc->vc_pos;
+ int offset;
+
+ switch (vpar) {
+ case 0: /* erase from cursor to end of line */
+ offset = 0;
+ count = vc->vc_cols - vc->state.x;
+ break;
+ case 1: /* erase from start of line to cursor */
+ offset = -vc->state.x;
+ count = vc->state.x + 1;
+ break;
+ case 2: /* erase whole line */
+ offset = -vc->state.x;
+ count = vc->vc_cols;
+ break;
+ default:
+ return;
+ }
+ vc_uniscr_clear_line(vc, vc->state.x + offset, count);
+ scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
+ vc->vc_need_wrap = 0;
+ if (con_should_update(vc))
+ do_update_region(vc, (unsigned long)(start + offset), count);
+}
+
+/* erase the following vpar positions */
+static void csi_X(struct vc_data *vc, unsigned int vpar)
+{ /* not vt100? */
+ unsigned int count;
+
+ if (!vpar)
+ vpar++;
+
+ count = min(vpar, vc->vc_cols - vc->state.x);
+
+ vc_uniscr_clear_line(vc, vc->state.x, count);
+ scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
+ if (con_should_update(vc))
+ vc->vc_sw->con_clear(vc, vc->state.y, vc->state.x, 1, count);
+ vc->vc_need_wrap = 0;
+}
+
+static void default_attr(struct vc_data *vc)
+{
+ vc->state.intensity = VCI_NORMAL;
+ vc->state.italic = false;
+ vc->state.underline = false;
+ vc->state.reverse = false;
+ vc->state.blink = false;
+ vc->state.color = vc->vc_def_color;
+}
+
+struct rgb { u8 r; u8 g; u8 b; };
+
+static void rgb_from_256(int i, struct rgb *c)
+{
+ if (i < 8) { /* Standard colours. */
+ c->r = i&1 ? 0xaa : 0x00;
+ c->g = i&2 ? 0xaa : 0x00;
+ c->b = i&4 ? 0xaa : 0x00;
+ } else if (i < 16) {
+ c->r = i&1 ? 0xff : 0x55;
+ c->g = i&2 ? 0xff : 0x55;
+ c->b = i&4 ? 0xff : 0x55;
+ } else if (i < 232) { /* 6x6x6 colour cube. */
+ c->r = (i - 16) / 36 * 85 / 2;
+ c->g = (i - 16) / 6 % 6 * 85 / 2;
+ c->b = (i - 16) % 6 * 85 / 2;
+ } else /* Grayscale ramp. */
+ c->r = c->g = c->b = i * 10 - 2312;
+}
+
+static void rgb_foreground(struct vc_data *vc, const struct rgb *c)
+{
+ u8 hue = 0, max = max3(c->r, c->g, c->b);
+
+ if (c->r > max / 2)
+ hue |= 4;
+ if (c->g > max / 2)
+ hue |= 2;
+ if (c->b > max / 2)
+ hue |= 1;
+
+ if (hue == 7 && max <= 0x55) {
+ hue = 0;
+ vc->state.intensity = VCI_BOLD;
+ } else if (max > 0xaa)
+ vc->state.intensity = VCI_BOLD;
+ else
+ vc->state.intensity = VCI_NORMAL;
+
+ vc->state.color = (vc->state.color & 0xf0) | hue;
+}
+
+static void rgb_background(struct vc_data *vc, const struct rgb *c)
+{
+ /* For backgrounds, err on the dark side. */
+ vc->state.color = (vc->state.color & 0x0f)
+ | (c->r&0x80) >> 1 | (c->g&0x80) >> 2 | (c->b&0x80) >> 3;
+}
+
+/*
+ * ITU T.416 Higher colour modes. They break the usual properties of SGR codes
+ * and thus need to be detected and ignored by hand. That standard also
+ * wants : rather than ; as separators but sequences containing : are currently
+ * completely ignored by the parser.
+ *
+ * Subcommands 3 (CMY) and 4 (CMYK) are so insane there's no point in
+ * supporting them.
+ */
+static int vc_t416_color(struct vc_data *vc, int i,
+ void(*set_color)(struct vc_data *vc, const struct rgb *c))
+{
+ struct rgb c;
+
+ i++;
+ if (i > vc->vc_npar)
+ return i;
+
+ if (vc->vc_par[i] == 5 && i + 1 <= vc->vc_npar) {
+ /* 256 colours */
+ i++;
+ rgb_from_256(vc->vc_par[i], &c);
+ } else if (vc->vc_par[i] == 2 && i + 3 <= vc->vc_npar) {
+ /* 24 bit */
+ c.r = vc->vc_par[i + 1];
+ c.g = vc->vc_par[i + 2];
+ c.b = vc->vc_par[i + 3];
+ i += 3;
+ } else
+ return i;
+
+ set_color(vc, &c);
+
+ return i;
+}
+
+/* console_lock is held */
+static void csi_m(struct vc_data *vc)
+{
+ int i;
+
+ for (i = 0; i <= vc->vc_npar; i++)
+ switch (vc->vc_par[i]) {
+ case 0: /* all attributes off */
+ default_attr(vc);
+ break;
+ case 1:
+ vc->state.intensity = VCI_BOLD;
+ break;
+ case 2:
+ vc->state.intensity = VCI_HALF_BRIGHT;
+ break;
+ case 3:
+ vc->state.italic = true;
+ break;
+ case 21:
+ /*
+ * No console drivers support double underline, so
+ * convert it to a single underline.
+ */
+ case 4:
+ vc->state.underline = true;
+ break;
+ case 5:
+ vc->state.blink = true;
+ break;
+ case 7:
+ vc->state.reverse = true;
+ break;
+ case 10: /* ANSI X3.64-1979 (SCO-ish?)
+ * Select primary font, don't display control chars if
+ * defined, don't set bit 8 on output.
+ */
+ vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset], vc);
+ vc->vc_disp_ctrl = 0;
+ vc->vc_toggle_meta = 0;
+ break;
+ case 11: /* ANSI X3.64-1979 (SCO-ish?)
+ * Select first alternate font, lets chars < 32 be
+ * displayed as ROM chars.
+ */
+ vc->vc_translate = set_translate(IBMPC_MAP, vc);
+ vc->vc_disp_ctrl = 1;
+ vc->vc_toggle_meta = 0;
+ break;
+ case 12: /* ANSI X3.64-1979 (SCO-ish?)
+ * Select second alternate font, toggle high bit
+ * before displaying as ROM char.
+ */
+ vc->vc_translate = set_translate(IBMPC_MAP, vc);
+ vc->vc_disp_ctrl = 1;
+ vc->vc_toggle_meta = 1;
+ break;
+ case 22:
+ vc->state.intensity = VCI_NORMAL;
+ break;
+ case 23:
+ vc->state.italic = false;
+ break;
+ case 24:
+ vc->state.underline = false;
+ break;
+ case 25:
+ vc->state.blink = false;
+ break;
+ case 27:
+ vc->state.reverse = false;
+ break;
+ case 38:
+ i = vc_t416_color(vc, i, rgb_foreground);
+ break;
+ case 48:
+ i = vc_t416_color(vc, i, rgb_background);
+ break;
+ case 39:
+ vc->state.color = (vc->vc_def_color & 0x0f) |
+ (vc->state.color & 0xf0);
+ break;
+ case 49:
+ vc->state.color = (vc->vc_def_color & 0xf0) |
+ (vc->state.color & 0x0f);
+ break;
+ default:
+ if (vc->vc_par[i] >= 90 && vc->vc_par[i] <= 107) {
+ if (vc->vc_par[i] < 100)
+ vc->state.intensity = VCI_BOLD;
+ vc->vc_par[i] -= 60;
+ }
+ if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
+ vc->state.color = color_table[vc->vc_par[i] - 30]
+ | (vc->state.color & 0xf0);
+ else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
+ vc->state.color = (color_table[vc->vc_par[i] - 40] << 4)
+ | (vc->state.color & 0x0f);
+ break;
+ }
+ update_attr(vc);
+}
+
+static void respond_string(const char *p, size_t len, struct tty_port *port)
+{
+ tty_insert_flip_string(port, p, len);
+ tty_flip_buffer_push(port);
+}
+
+static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
+{
+ char buf[40];
+ int len;
+
+ len = sprintf(buf, "\033[%d;%dR", vc->state.y +
+ (vc->vc_decom ? vc->vc_top + 1 : 1),
+ vc->state.x + 1);
+ respond_string(buf, len, tty->port);
+}
+
+static inline void status_report(struct tty_struct *tty)
+{
+ static const char teminal_ok[] = "\033[0n";
+
+ respond_string(teminal_ok, strlen(teminal_ok), tty->port);
+}
+
+static inline void respond_ID(struct tty_struct *tty)
+{
+ /* terminal answer to an ESC-Z or csi0c query. */
+ static const char vt102_id[] = "\033[?6c";
+
+ respond_string(vt102_id, strlen(vt102_id), tty->port);
+}
+
+void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
+{
+ char buf[8];
+ int len;
+
+ len = sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt),
+ (char)('!' + mrx), (char)('!' + mry));
+ respond_string(buf, len, tty->port);
+}
+
+/* invoked via ioctl(TIOCLINUX) and through set_selection_user */
+int mouse_reporting(void)
+{
+ return vc_cons[fg_console].d->vc_report_mouse;
+}
+
+/* console_lock is held */
+static void set_mode(struct vc_data *vc, int on_off)
+{
+ int i;
+
+ for (i = 0; i <= vc->vc_npar; i++)
+ if (vc->vc_priv == EPdec) {
+ switch(vc->vc_par[i]) { /* DEC private modes set/reset */
+ case 1: /* Cursor keys send ^[Ox/^[[x */
+ if (on_off)
+ set_kbd(vc, decckm);
+ else
+ clr_kbd(vc, decckm);
+ break;
+ case 3: /* 80/132 mode switch unimplemented */
+#if 0
+ vc_resize(deccolm ? 132 : 80, vc->vc_rows);
+ /* this alone does not suffice; some user mode
+ utility has to change the hardware regs */
+#endif
+ break;
+ case 5: /* Inverted screen on/off */
+ if (vc->vc_decscnm != on_off) {
+ vc->vc_decscnm = on_off;
+ invert_screen(vc, 0,
+ vc->vc_screenbuf_size,
+ false);
+ update_attr(vc);
+ }
+ break;
+ case 6: /* Origin relative/absolute */
+ vc->vc_decom = on_off;
+ gotoxay(vc, 0, 0);
+ break;
+ case 7: /* Autowrap on/off */
+ vc->vc_decawm = on_off;
+ break;
+ case 8: /* Autorepeat on/off */
+ if (on_off)
+ set_kbd(vc, decarm);
+ else
+ clr_kbd(vc, decarm);
+ break;
+ case 9:
+ vc->vc_report_mouse = on_off ? 1 : 0;
+ break;
+ case 25: /* Cursor on/off */
+ vc->vc_deccm = on_off;
+ break;
+ case 1000:
+ vc->vc_report_mouse = on_off ? 2 : 0;
+ break;
+ }
+ } else {
+ switch(vc->vc_par[i]) { /* ANSI modes set/reset */
+ case 3: /* Monitor (display ctrls) */
+ vc->vc_disp_ctrl = on_off;
+ break;
+ case 4: /* Insert Mode on/off */
+ vc->vc_decim = on_off;
+ break;
+ case 20: /* Lf, Enter == CrLf/Lf */
+ if (on_off)
+ set_kbd(vc, lnm);
+ else
+ clr_kbd(vc, lnm);
+ break;
+ }
+ }
+}
+
+/* console_lock is held */
+static void setterm_command(struct vc_data *vc)
+{
+ switch (vc->vc_par[0]) {
+ case 1: /* set color for underline mode */
+ if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
+ vc->vc_ulcolor = color_table[vc->vc_par[1]];
+ if (vc->state.underline)
+ update_attr(vc);
+ }
+ break;
+ case 2: /* set color for half intensity mode */
+ if (vc->vc_can_do_color && vc->vc_par[1] < 16) {
+ vc->vc_halfcolor = color_table[vc->vc_par[1]];
+ if (vc->state.intensity == VCI_HALF_BRIGHT)
+ update_attr(vc);
+ }
+ break;
+ case 8: /* store colors as defaults */
+ vc->vc_def_color = vc->vc_attr;
+ if (vc->vc_hi_font_mask == 0x100)
+ vc->vc_def_color >>= 1;
+ default_attr(vc);
+ update_attr(vc);
+ break;
+ case 9: /* set blanking interval */
+ blankinterval = min(vc->vc_par[1], 60U) * 60;
+ poke_blanked_console();
+ break;
+ case 10: /* set bell frequency in Hz */
+ if (vc->vc_npar >= 1)
+ vc->vc_bell_pitch = vc->vc_par[1];
+ else
+ vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+ break;
+ case 11: /* set bell duration in msec */
+ if (vc->vc_npar >= 1)
+ vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
+ msecs_to_jiffies(vc->vc_par[1]) : 0;
+ else
+ vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+ break;
+ case 12: /* bring specified console to the front */
+ if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
+ set_console(vc->vc_par[1] - 1);
+ break;
+ case 13: /* unblank the screen */
+ poke_blanked_console();
+ break;
+ case 14: /* set vesa powerdown interval */
+ vesa_off_interval = min(vc->vc_par[1], 60U) * 60 * HZ;
+ break;
+ case 15: /* activate the previous console */
+ set_console(last_console);
+ break;
+ case 16: /* set cursor blink duration in msec */
+ if (vc->vc_npar >= 1 && vc->vc_par[1] >= 50 &&
+ vc->vc_par[1] <= USHRT_MAX)
+ vc->vc_cur_blink_ms = vc->vc_par[1];
+ else
+ vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
+ break;
+ }
+}
+
+/* console_lock is held */
+static void csi_at(struct vc_data *vc, unsigned int nr)
+{
+ if (nr > vc->vc_cols - vc->state.x)
+ nr = vc->vc_cols - vc->state.x;
+ else if (!nr)
+ nr = 1;
+ insert_char(vc, nr);
+}
+
+/* console_lock is held */
+static void csi_L(struct vc_data *vc, unsigned int nr)
+{
+ if (nr > vc->vc_rows - vc->state.y)
+ nr = vc->vc_rows - vc->state.y;
+ else if (!nr)
+ nr = 1;
+ con_scroll(vc, vc->state.y, vc->vc_bottom, SM_DOWN, nr);
+ vc->vc_need_wrap = 0;
+}
+
+/* console_lock is held */
+static void csi_P(struct vc_data *vc, unsigned int nr)
+{
+ if (nr > vc->vc_cols - vc->state.x)
+ nr = vc->vc_cols - vc->state.x;
+ else if (!nr)
+ nr = 1;
+ delete_char(vc, nr);
+}
+
+/* console_lock is held */
+static void csi_M(struct vc_data *vc, unsigned int nr)
+{
+ if (nr > vc->vc_rows - vc->state.y)
+ nr = vc->vc_rows - vc->state.y;
+ else if (!nr)
+ nr=1;
+ con_scroll(vc, vc->state.y, vc->vc_bottom, SM_UP, nr);
+ vc->vc_need_wrap = 0;
+}
+
+/* console_lock is held (except via vc_init->reset_terminal */
+static void save_cur(struct vc_data *vc)
+{
+ memcpy(&vc->saved_state, &vc->state, sizeof(vc->state));
+}
+
+/* console_lock is held */
+static void restore_cur(struct vc_data *vc)
+{
+ memcpy(&vc->state, &vc->saved_state, sizeof(vc->state));
+
+ gotoxy(vc, vc->state.x, vc->state.y);
+ vc->vc_translate = set_translate(vc->state.Gx_charset[vc->state.charset],
+ vc);
+ update_attr(vc);
+ vc->vc_need_wrap = 0;
+}
+
+enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
+ EShash, ESsetG0, ESsetG1, ESpercent, EScsiignore, ESnonstd,
+ ESpalette, ESosc, ESapc, ESpm, ESdcs };
+
+/* console_lock is held (except via vc_init()) */
+static void reset_terminal(struct vc_data *vc, int do_clear)
+{
+ unsigned int i;
+
+ vc->vc_top = 0;
+ vc->vc_bottom = vc->vc_rows;
+ vc->vc_state = ESnormal;
+ vc->vc_priv = EPecma;
+ vc->vc_translate = set_translate(LAT1_MAP, vc);
+ vc->state.Gx_charset[0] = LAT1_MAP;
+ vc->state.Gx_charset[1] = GRAF_MAP;
+ vc->state.charset = 0;
+ vc->vc_need_wrap = 0;
+ vc->vc_report_mouse = 0;
+ vc->vc_utf = default_utf8;
+ vc->vc_utf_count = 0;
+
+ vc->vc_disp_ctrl = 0;
+ vc->vc_toggle_meta = 0;
+
+ vc->vc_decscnm = 0;
+ vc->vc_decom = 0;
+ vc->vc_decawm = 1;
+ vc->vc_deccm = global_cursor_default;
+ vc->vc_decim = 0;
+
+ vt_reset_keyboard(vc->vc_num);
+
+ vc->vc_cursor_type = cur_default;
+ vc->vc_complement_mask = vc->vc_s_complement_mask;
+
+ default_attr(vc);
+ update_attr(vc);
+
+ bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
+ for (i = 0; i < VC_TABSTOPS_COUNT; i += 8)
+ set_bit(i, vc->vc_tab_stop);
+
+ vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
+ vc->vc_bell_duration = DEFAULT_BELL_DURATION;
+ vc->vc_cur_blink_ms = DEFAULT_CURSOR_BLINK_MS;
+
+ gotoxy(vc, 0, 0);
+ save_cur(vc);
+ if (do_clear)
+ csi_J(vc, 2);
+}
+
+static void vc_setGx(struct vc_data *vc, unsigned int which, int c)
+{
+ unsigned char *charset = &vc->state.Gx_charset[which];
+
+ switch (c) {
+ case '0':
+ *charset = GRAF_MAP;
+ break;
+ case 'B':
+ *charset = LAT1_MAP;
+ break;
+ case 'U':
+ *charset = IBMPC_MAP;
+ break;
+ case 'K':
+ *charset = USER_MAP;
+ break;
+ }
+
+ if (vc->state.charset == which)
+ vc->vc_translate = set_translate(*charset, vc);
+}
+
+/* is this state an ANSI control string? */
+static bool ansi_control_string(unsigned int state)
+{
+ if (state == ESosc || state == ESapc || state == ESpm || state == ESdcs)
+ return true;
+ return false;
+}
+
+/* console_lock is held */
+static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
+{
+ /*
+ * Control characters can be used in the _middle_
+ * of an escape sequence, aside from ANSI control strings.
+ */
+ if (ansi_control_string(vc->vc_state) && c >= 8 && c <= 13)
+ return;
+ switch (c) {
+ case 0:
+ return;
+ case 7:
+ if (ansi_control_string(vc->vc_state))
+ vc->vc_state = ESnormal;
+ else if (vc->vc_bell_duration)
+ kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
+ return;
+ case 8:
+ bs(vc);
+ return;
+ case 9:
+ vc->vc_pos -= (vc->state.x << 1);
+
+ vc->state.x = find_next_bit(vc->vc_tab_stop,
+ min(vc->vc_cols - 1, VC_TABSTOPS_COUNT),
+ vc->state.x + 1);
+ if (vc->state.x >= VC_TABSTOPS_COUNT)
+ vc->state.x = vc->vc_cols - 1;
+
+ vc->vc_pos += (vc->state.x << 1);
+ notify_write(vc, '\t');
+ return;
+ case 10: case 11: case 12:
+ lf(vc);
+ if (!is_kbd(vc, lnm))
+ return;
+ fallthrough;
+ case 13:
+ cr(vc);
+ return;
+ case 14:
+ vc->state.charset = 1;
+ vc->vc_translate = set_translate(vc->state.Gx_charset[1], vc);
+ vc->vc_disp_ctrl = 1;
+ return;
+ case 15:
+ vc->state.charset = 0;
+ vc->vc_translate = set_translate(vc->state.Gx_charset[0], vc);
+ vc->vc_disp_ctrl = 0;
+ return;
+ case 24: case 26:
+ vc->vc_state = ESnormal;
+ return;
+ case 27:
+ vc->vc_state = ESesc;
+ return;
+ case 127:
+ del(vc);
+ return;
+ case 128+27:
+ vc->vc_state = ESsquare;
+ return;
+ }
+ switch(vc->vc_state) {
+ case ESesc:
+ vc->vc_state = ESnormal;
+ switch (c) {
+ case '[':
+ vc->vc_state = ESsquare;
+ return;
+ case ']':
+ vc->vc_state = ESnonstd;
+ return;
+ case '_':
+ vc->vc_state = ESapc;
+ return;
+ case '^':
+ vc->vc_state = ESpm;
+ return;
+ case '%':
+ vc->vc_state = ESpercent;
+ return;
+ case 'E':
+ cr(vc);
+ lf(vc);
+ return;
+ case 'M':
+ ri(vc);
+ return;
+ case 'D':
+ lf(vc);
+ return;
+ case 'H':
+ if (vc->state.x < VC_TABSTOPS_COUNT)
+ set_bit(vc->state.x, vc->vc_tab_stop);
+ return;
+ case 'P':
+ vc->vc_state = ESdcs;
+ return;
+ case 'Z':
+ respond_ID(tty);
+ return;
+ case '7':
+ save_cur(vc);
+ return;
+ case '8':
+ restore_cur(vc);
+ return;
+ case '(':
+ vc->vc_state = ESsetG0;
+ return;
+ case ')':
+ vc->vc_state = ESsetG1;
+ return;
+ case '#':
+ vc->vc_state = EShash;
+ return;
+ case 'c':
+ reset_terminal(vc, 1);
+ return;
+ case '>': /* Numeric keypad */
+ clr_kbd(vc, kbdapplic);
+ return;
+ case '=': /* Appl. keypad */
+ set_kbd(vc, kbdapplic);
+ return;
+ }
+ return;
+ case ESnonstd:
+ if (c=='P') { /* palette escape sequence */
+ for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+ vc->vc_par[vc->vc_npar] = 0;
+ vc->vc_npar = 0;
+ vc->vc_state = ESpalette;
+ return;
+ } else if (c=='R') { /* reset palette */
+ reset_palette(vc);
+ vc->vc_state = ESnormal;
+ } else if (c>='0' && c<='9')
+ vc->vc_state = ESosc;
+ else
+ vc->vc_state = ESnormal;
+ return;
+ case ESpalette:
+ if (isxdigit(c)) {
+ vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
+ if (vc->vc_npar == 7) {
+ int i = vc->vc_par[0] * 3, j = 1;
+ vc->vc_palette[i] = 16 * vc->vc_par[j++];
+ vc->vc_palette[i++] += vc->vc_par[j++];
+ vc->vc_palette[i] = 16 * vc->vc_par[j++];
+ vc->vc_palette[i++] += vc->vc_par[j++];
+ vc->vc_palette[i] = 16 * vc->vc_par[j++];
+ vc->vc_palette[i] += vc->vc_par[j];
+ set_palette(vc);
+ vc->vc_state = ESnormal;
+ }
+ } else
+ vc->vc_state = ESnormal;
+ return;
+ case ESsquare:
+ for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
+ vc->vc_par[vc->vc_npar] = 0;
+ vc->vc_npar = 0;
+ vc->vc_state = ESgetpars;
+ if (c == '[') { /* Function key */
+ vc->vc_state=ESfunckey;
+ return;
+ }
+ switch (c) {
+ case '?':
+ vc->vc_priv = EPdec;
+ return;
+ case '>':
+ vc->vc_priv = EPgt;
+ return;
+ case '=':
+ vc->vc_priv = EPeq;
+ return;
+ case '<':
+ vc->vc_priv = EPlt;
+ return;
+ }
+ vc->vc_priv = EPecma;
+ fallthrough;
+ case ESgetpars:
+ if (c == ';' && vc->vc_npar < NPAR - 1) {
+ vc->vc_npar++;
+ return;
+ } else if (c>='0' && c<='9') {
+ vc->vc_par[vc->vc_npar] *= 10;
+ vc->vc_par[vc->vc_npar] += c - '0';
+ return;
+ }
+ if (c >= 0x20 && c <= 0x3f) { /* 0x2x, 0x3a and 0x3c - 0x3f */
+ vc->vc_state = EScsiignore;
+ return;
+ }
+ vc->vc_state = ESnormal;
+ switch(c) {
+ case 'h':
+ if (vc->vc_priv <= EPdec)
+ set_mode(vc, 1);
+ return;
+ case 'l':
+ if (vc->vc_priv <= EPdec)
+ set_mode(vc, 0);
+ return;
+ case 'c':
+ if (vc->vc_priv == EPdec) {
+ if (vc->vc_par[0])
+ vc->vc_cursor_type =
+ CUR_MAKE(vc->vc_par[0],
+ vc->vc_par[1],
+ vc->vc_par[2]);
+ else
+ vc->vc_cursor_type = cur_default;
+ return;
+ }
+ break;
+ case 'm':
+ if (vc->vc_priv == EPdec) {
+ clear_selection();
+ if (vc->vc_par[0])
+ vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
+ else
+ vc->vc_complement_mask = vc->vc_s_complement_mask;
+ return;
+ }
+ break;
+ case 'n':
+ if (vc->vc_priv == EPecma) {
+ if (vc->vc_par[0] == 5)
+ status_report(tty);
+ else if (vc->vc_par[0] == 6)
+ cursor_report(vc, tty);
+ }
+ return;
+ }
+ if (vc->vc_priv != EPecma) {
+ vc->vc_priv = EPecma;
+ return;
+ }
+ switch(c) {
+ case 'G': case '`':
+ if (vc->vc_par[0])
+ vc->vc_par[0]--;
+ gotoxy(vc, vc->vc_par[0], vc->state.y);
+ return;
+ case 'A':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, vc->state.x, vc->state.y - vc->vc_par[0]);
+ return;
+ case 'B': case 'e':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, vc->state.x, vc->state.y + vc->vc_par[0]);
+ return;
+ case 'C': case 'a':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, vc->state.x + vc->vc_par[0], vc->state.y);
+ return;
+ case 'D':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, vc->state.x - vc->vc_par[0], vc->state.y);
+ return;
+ case 'E':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, 0, vc->state.y + vc->vc_par[0]);
+ return;
+ case 'F':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ gotoxy(vc, 0, vc->state.y - vc->vc_par[0]);
+ return;
+ case 'd':
+ if (vc->vc_par[0])
+ vc->vc_par[0]--;
+ gotoxay(vc, vc->state.x ,vc->vc_par[0]);
+ return;
+ case 'H': case 'f':
+ if (vc->vc_par[0])
+ vc->vc_par[0]--;
+ if (vc->vc_par[1])
+ vc->vc_par[1]--;
+ gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
+ return;
+ case 'J':
+ csi_J(vc, vc->vc_par[0]);
+ return;
+ case 'K':
+ csi_K(vc, vc->vc_par[0]);
+ return;
+ case 'L':
+ csi_L(vc, vc->vc_par[0]);
+ return;
+ case 'M':
+ csi_M(vc, vc->vc_par[0]);
+ return;
+ case 'P':
+ csi_P(vc, vc->vc_par[0]);
+ return;
+ case 'c':
+ if (!vc->vc_par[0])
+ respond_ID(tty);
+ return;
+ case 'g':
+ if (!vc->vc_par[0] && vc->state.x < VC_TABSTOPS_COUNT)
+ set_bit(vc->state.x, vc->vc_tab_stop);
+ else if (vc->vc_par[0] == 3)
+ bitmap_zero(vc->vc_tab_stop, VC_TABSTOPS_COUNT);
+ return;
+ case 'm':
+ csi_m(vc);
+ return;
+ case 'q': /* DECLL - but only 3 leds */
+ /* map 0,1,2,3 to 0,1,2,4 */
+ if (vc->vc_par[0] < 4)
+ vt_set_led_state(vc->vc_num,
+ (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
+ return;
+ case 'r':
+ if (!vc->vc_par[0])
+ vc->vc_par[0]++;
+ if (!vc->vc_par[1])
+ vc->vc_par[1] = vc->vc_rows;
+ /* Minimum allowed region is 2 lines */
+ if (vc->vc_par[0] < vc->vc_par[1] &&
+ vc->vc_par[1] <= vc->vc_rows) {
+ vc->vc_top = vc->vc_par[0] - 1;
+ vc->vc_bottom = vc->vc_par[1];
+ gotoxay(vc, 0, 0);
+ }
+ return;
+ case 's':
+ save_cur(vc);
+ return;
+ case 'u':
+ restore_cur(vc);
+ return;
+ case 'X':
+ csi_X(vc, vc->vc_par[0]);
+ return;
+ case '@':
+ csi_at(vc, vc->vc_par[0]);
+ return;
+ case ']': /* setterm functions */
+ setterm_command(vc);
+ return;
+ }
+ return;
+ case EScsiignore:
+ if (c >= 20 && c <= 0x3f)
+ return;
+ vc->vc_state = ESnormal;
+ return;
+ case ESpercent:
+ vc->vc_state = ESnormal;
+ switch (c) {
+ case '@': /* defined in ISO 2022 */
+ vc->vc_utf = 0;
+ return;
+ case 'G': /* prelim official escape code */
+ case '8': /* retained for compatibility */
+ vc->vc_utf = 1;
+ return;
+ }
+ return;
+ case ESfunckey:
+ vc->vc_state = ESnormal;
+ return;
+ case EShash:
+ vc->vc_state = ESnormal;
+ if (c == '8') {
+ /* DEC screen alignment test. kludge :-) */
+ vc->vc_video_erase_char =
+ (vc->vc_video_erase_char & 0xff00) | 'E';
+ csi_J(vc, 2);
+ vc->vc_video_erase_char =
+ (vc->vc_video_erase_char & 0xff00) | ' ';
+ do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
+ }
+ return;
+ case ESsetG0:
+ vc_setGx(vc, 0, c);
+ vc->vc_state = ESnormal;
+ return;
+ case ESsetG1:
+ vc_setGx(vc, 1, c);
+ vc->vc_state = ESnormal;
+ return;
+ case ESapc:
+ return;
+ case ESosc:
+ return;
+ case ESpm:
+ return;
+ case ESdcs:
+ return;
+ default:
+ vc->vc_state = ESnormal;
+ }
+}
+
+/* is_double_width() is based on the wcwidth() implementation by
+ * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+ * Latest version: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ */
+struct interval {
+ uint32_t first;
+ uint32_t last;
+};
+
+static int ucs_cmp(const void *key, const void *elt)
+{
+ uint32_t ucs = *(uint32_t *)key;
+ struct interval e = *(struct interval *) elt;
+
+ if (ucs > e.last)
+ return 1;
+ else if (ucs < e.first)
+ return -1;
+ return 0;
+}
+
+static int is_double_width(uint32_t ucs)
+{
+ static const struct interval double_width[] = {
+ { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
+ { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
+ { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
+ { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
+ };
+ if (ucs < double_width[0].first ||
+ ucs > double_width[ARRAY_SIZE(double_width) - 1].last)
+ return 0;
+
+ return bsearch(&ucs, double_width, ARRAY_SIZE(double_width),
+ sizeof(struct interval), ucs_cmp) != NULL;
+}
+
+struct vc_draw_region {
+ unsigned long from, to;
+ int x;
+};
+
+static void con_flush(struct vc_data *vc, struct vc_draw_region *draw)
+{
+ if (draw->x < 0)
+ return;
+
+ vc->vc_sw->con_putcs(vc, (u16 *)draw->from,
+ (u16 *)draw->to - (u16 *)draw->from, vc->state.y,
+ draw->x);
+ draw->x = -1;
+}
+
+static inline int vc_translate_ascii(const struct vc_data *vc, int c)
+{
+ if (IS_ENABLED(CONFIG_CONSOLE_TRANSLATIONS)) {
+ if (vc->vc_toggle_meta)
+ c |= 0x80;
+
+ return vc->vc_translate[c];
+ }
+
+ return c;
+}
+
+
+/**
+ * vc_sanitize_unicode -- Replace invalid Unicode code points with U+FFFD
+ * @c: the received character, or U+FFFD for invalid sequences.
+ */
+static inline int vc_sanitize_unicode(const int c)
+{
+ if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
+ return 0xfffd;
+
+ return c;
+}
+
+/**
+ * vc_translate_unicode -- Combine UTF-8 into Unicode in @vc_utf_char
+ * @vc: virtual console
+ * @c: character to translate
+ * @rescan: we return true if we need more (continuation) data
+ *
+ * @vc_utf_char is the being-constructed unicode character.
+ * @vc_utf_count is the number of continuation bytes still expected to arrive.
+ * @vc_npar is the number of continuation bytes arrived so far.
+ */
+static int vc_translate_unicode(struct vc_data *vc, int c, bool *rescan)
+{
+ static const u32 utf8_length_changes[] = {
+ 0x0000007f, 0x000007ff, 0x0000ffff,
+ 0x001fffff, 0x03ffffff, 0x7fffffff
+ };
+
+ /* Continuation byte received */
+ if ((c & 0xc0) == 0x80) {
+ /* Unexpected continuation byte? */
+ if (!vc->vc_utf_count)
+ return 0xfffd;
+
+ vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
+ vc->vc_npar++;
+ if (--vc->vc_utf_count)
+ goto need_more_bytes;
+
+ /* Got a whole character */
+ c = vc->vc_utf_char;
+ /* Reject overlong sequences */
+ if (c <= utf8_length_changes[vc->vc_npar - 1] ||
+ c > utf8_length_changes[vc->vc_npar])
+ return 0xfffd;
+
+ return vc_sanitize_unicode(c);
+ }
+
+ /* Single ASCII byte or first byte of a sequence received */
+ if (vc->vc_utf_count) {
+ /* Continuation byte expected */
+ *rescan = true;
+ vc->vc_utf_count = 0;
+ return 0xfffd;
+ }
+
+ /* Nothing to do if an ASCII byte was received */
+ if (c <= 0x7f)
+ return c;
+
+ /* First byte of a multibyte sequence received */
+ vc->vc_npar = 0;
+ if ((c & 0xe0) == 0xc0) {
+ vc->vc_utf_count = 1;
+ vc->vc_utf_char = (c & 0x1f);
+ } else if ((c & 0xf0) == 0xe0) {
+ vc->vc_utf_count = 2;
+ vc->vc_utf_char = (c & 0x0f);
+ } else if ((c & 0xf8) == 0xf0) {
+ vc->vc_utf_count = 3;
+ vc->vc_utf_char = (c & 0x07);
+ } else if ((c & 0xfc) == 0xf8) {
+ vc->vc_utf_count = 4;
+ vc->vc_utf_char = (c & 0x03);
+ } else if ((c & 0xfe) == 0xfc) {
+ vc->vc_utf_count = 5;
+ vc->vc_utf_char = (c & 0x01);
+ } else {
+ /* 254 and 255 are invalid */
+ return 0xfffd;
+ }
+
+need_more_bytes:
+ return -1;
+}
+
+static int vc_translate(struct vc_data *vc, int *c, bool *rescan)
+{
+ /* Do no translation at all in control states */
+ if (vc->vc_state != ESnormal)
+ return *c;
+
+ if (vc->vc_utf && !vc->vc_disp_ctrl)
+ return *c = vc_translate_unicode(vc, *c, rescan);
+
+ /* no utf or alternate charset mode */
+ return vc_translate_ascii(vc, *c);
+}
+
+static inline unsigned char vc_invert_attr(const struct vc_data *vc)
+{
+ if (!vc->vc_can_do_color)
+ return vc->vc_attr ^ 0x08;
+
+ if (vc->vc_hi_font_mask == 0x100)
+ return (vc->vc_attr & 0x11) |
+ ((vc->vc_attr & 0xe0) >> 4) |
+ ((vc->vc_attr & 0x0e) << 4);
+
+ return (vc->vc_attr & 0x88) |
+ ((vc->vc_attr & 0x70) >> 4) |
+ ((vc->vc_attr & 0x07) << 4);
+}
+
+static bool vc_is_control(struct vc_data *vc, int tc, int c)
+{
+ /*
+ * A bitmap for codes <32. A bit of 1 indicates that the code
+ * corresponding to that bit number invokes some special action (such
+ * as cursor movement) and should not be displayed as a glyph unless
+ * the disp_ctrl mode is explicitly enabled.
+ */
+ static const u32 CTRL_ACTION = 0x0d00ff81;
+ /* Cannot be overridden by disp_ctrl */
+ static const u32 CTRL_ALWAYS = 0x0800f501;
+
+ if (vc->vc_state != ESnormal)
+ return true;
+
+ if (!tc)
+ return true;
+
+ /*
+ * If the original code was a control character we only allow a glyph
+ * to be displayed if the code is not normally used (such as for cursor
+ * movement) or if the disp_ctrl mode has been explicitly enabled.
+ * Certain characters (as given by the CTRL_ALWAYS bitmap) are always
+ * displayed as control characters, as the console would be pretty
+ * useless without them; to display an arbitrary font position use the
+ * direct-to-font zone in UTF-8 mode.
+ */
+ if (c < 32) {
+ if (vc->vc_disp_ctrl)
+ return CTRL_ALWAYS & BIT(c);
+ else
+ return vc->vc_utf || (CTRL_ACTION & BIT(c));
+ }
+
+ if (c == 127 && !vc->vc_disp_ctrl)
+ return true;
+
+ if (c == 128 + 27)
+ return true;
+
+ return false;
+}
+
+static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
+ struct vc_draw_region *draw)
+{
+ int next_c;
+ unsigned char vc_attr = vc->vc_attr;
+ u16 himask = vc->vc_hi_font_mask, charmask = himask ? 0x1ff : 0xff;
+ u8 width = 1;
+ bool inverse = false;
+
+ if (vc->vc_utf && !vc->vc_disp_ctrl) {
+ if (is_double_width(c))
+ width = 2;
+ }
+
+ /* Now try to find out how to display it */
+ tc = conv_uni_to_pc(vc, tc);
+ if (tc & ~charmask) {
+ if (tc == -1 || tc == -2)
+ return -1; /* nothing to display */
+
+ /* Glyph not found */
+ if ((!vc->vc_utf || vc->vc_disp_ctrl || c < 128) &&
+ !(c & ~charmask)) {
+ /*
+ * In legacy mode use the glyph we get by a 1:1
+ * mapping.
+ * This would make absolutely no sense with Unicode in
+ * mind, but do this for ASCII characters since a font
+ * may lack Unicode mapping info and we don't want to
+ * end up with having question marks only.
+ */
+ tc = c;
+ } else {
+ /*
+ * Display U+FFFD. If it's not found, display an inverse
+ * question mark.
+ */
+ tc = conv_uni_to_pc(vc, 0xfffd);
+ if (tc < 0) {
+ inverse = true;
+ tc = conv_uni_to_pc(vc, '?');
+ if (tc < 0)
+ tc = '?';
+
+ vc_attr = vc_invert_attr(vc);
+ con_flush(vc, draw);
+ }
+ }
+ }
+
+ next_c = c;
+ while (1) {
+ if (vc->vc_need_wrap || vc->vc_decim)
+ con_flush(vc, draw);
+ if (vc->vc_need_wrap) {
+ cr(vc);
+ lf(vc);
+ }
+ if (vc->vc_decim)
+ insert_char(vc, 1);
+ vc_uniscr_putc(vc, next_c);
+
+ if (himask)
+ tc = ((tc & 0x100) ? himask : 0) |
+ (tc & 0xff);
+ tc |= (vc_attr << 8) & ~himask;
+
+ scr_writew(tc, (u16 *)vc->vc_pos);
+
+ if (con_should_update(vc) && draw->x < 0) {
+ draw->x = vc->state.x;
+ draw->from = vc->vc_pos;
+ }
+ if (vc->state.x == vc->vc_cols - 1) {
+ vc->vc_need_wrap = vc->vc_decawm;
+ draw->to = vc->vc_pos + 2;
+ } else {
+ vc->state.x++;
+ draw->to = (vc->vc_pos += 2);
+ }
+
+ if (!--width)
+ break;
+
+ /* A space is printed in the second column */
+ tc = conv_uni_to_pc(vc, ' ');
+ if (tc < 0)
+ tc = ' ';
+ next_c = ' ';
+ }
+ notify_write(vc, c);
+
+ if (inverse)
+ con_flush(vc, draw);
+
+ return 0;
+}
+
+/* acquires console_lock */
+static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ struct vc_draw_region draw = {
+ .x = -1,
+ };
+ int c, tc, n = 0;
+ unsigned int currcons;
+ struct vc_data *vc;
+ struct vt_notifier_param param;
+ bool rescan;
+
+ if (in_interrupt())
+ return count;
+
+ console_lock();
+ vc = tty->driver_data;
+ if (vc == NULL) {
+ pr_err("vt: argh, driver_data is NULL !\n");
+ console_unlock();
+ return 0;
+ }
+
+ currcons = vc->vc_num;
+ if (!vc_cons_allocated(currcons)) {
+ /* could this happen? */
+ pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
+ console_unlock();
+ return 0;
+ }
+
+
+ /* undraw cursor first */
+ if (con_is_fg(vc))
+ hide_cursor(vc);
+
+ param.vc = vc;
+
+ while (!tty->flow.stopped && count) {
+ int orig = *buf;
+ buf++;
+ n++;
+ count--;
+rescan_last_byte:
+ c = orig;
+ rescan = false;
+
+ tc = vc_translate(vc, &c, &rescan);
+ if (tc == -1)
+ continue;
+
+ param.c = tc;
+ if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
+ &param) == NOTIFY_STOP)
+ continue;
+
+ if (vc_is_control(vc, tc, c)) {
+ con_flush(vc, &draw);
+ do_con_trol(tty, vc, orig);
+ continue;
+ }
+
+ if (vc_con_write_normal(vc, tc, c, &draw) < 0)
+ continue;
+
+ if (rescan)
+ goto rescan_last_byte;
+ }
+ con_flush(vc, &draw);
+ vc_uniscr_debug_check(vc);
+ console_conditional_schedule();
+ notify_update(vc);
+ console_unlock();
+ return n;
+}
+
+/*
+ * This is the console switching callback.
+ *
+ * Doing console switching in a process context allows
+ * us to do the switches asynchronously (needed when we want
+ * to switch due to a keyboard interrupt). Synchronization
+ * with other console code and prevention of re-entrancy is
+ * ensured with console_lock.
+ */
+static void console_callback(struct work_struct *ignored)
+{
+ console_lock();
+
+ if (want_console >= 0) {
+ if (want_console != fg_console &&
+ vc_cons_allocated(want_console)) {
+ hide_cursor(vc_cons[fg_console].d);
+ change_console(vc_cons[want_console].d);
+ /* we only changed when the console had already
+ been allocated - a new console is not created
+ in an interrupt routine */
+ }
+ want_console = -1;
+ }
+ if (do_poke_blanked_console) { /* do not unblank for a LED change */
+ do_poke_blanked_console = 0;
+ poke_blanked_console();
+ }
+ if (scrollback_delta) {
+ struct vc_data *vc = vc_cons[fg_console].d;
+ clear_selection();
+ if (vc->vc_mode == KD_TEXT && vc->vc_sw->con_scrolldelta)
+ vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
+ scrollback_delta = 0;
+ }
+ if (blank_timer_expired) {
+ do_blank_screen(0);
+ blank_timer_expired = 0;
+ }
+ notify_update(vc_cons[fg_console].d);
+
+ console_unlock();
+}
+
+int set_console(int nr)
+{
+ struct vc_data *vc = vc_cons[fg_console].d;
+
+ if (!vc_cons_allocated(nr) || vt_dont_switch ||
+ (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
+
+ /*
+ * Console switch will fail in console_callback() or
+ * change_console() so there is no point scheduling
+ * the callback
+ *
+ * Existing set_console() users don't check the return
+ * value so this shouldn't break anything
+ */
+ return -EINVAL;
+ }
+
+ want_console = nr;
+ schedule_console_callback();
+
+ return 0;
+}
+
+struct tty_driver *console_driver;
+
+#ifdef CONFIG_VT_CONSOLE
+
+/**
+ * vt_kmsg_redirect() - Sets/gets the kernel message console
+ * @new: The new virtual terminal number or -1 if the console should stay
+ * unchanged
+ *
+ * By default, the kernel messages are always printed on the current virtual
+ * console. However, the user may modify that default with the
+ * TIOCL_SETKMSGREDIRECT ioctl call.
+ *
+ * This function sets the kernel message console to be @new. It returns the old
+ * virtual console number. The virtual terminal number 0 (both as parameter and
+ * return value) means no redirection (i.e. always printed on the currently
+ * active console).
+ *
+ * The parameter -1 means that only the current console is returned, but the
+ * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
+ * case to make the code more understandable.
+ *
+ * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
+ * the parameter and always returns 0.
+ */
+int vt_kmsg_redirect(int new)
+{
+ static int kmsg_con;
+
+ if (new != -1)
+ return xchg(&kmsg_con, new);
+ else
+ return kmsg_con;
+}
+
+/*
+ * Console on virtual terminal
+ *
+ * The console must be locked when we get here.
+ */
+
+static void vt_console_print(struct console *co, const char *b, unsigned count)
+{
+ struct vc_data *vc = vc_cons[fg_console].d;
+ unsigned char c;
+ static DEFINE_SPINLOCK(printing_lock);
+ const ushort *start;
+ ushort start_x, cnt;
+ int kmsg_console;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ /* this protects against concurrent oops only */
+ if (!spin_trylock(&printing_lock))
+ return;
+
+ kmsg_console = vt_get_kmsg_redirect();
+ if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
+ vc = vc_cons[kmsg_console - 1].d;
+
+ if (!vc_cons_allocated(fg_console)) {
+ /* impossible */
+ /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
+ goto quit;
+ }
+
+ if (vc->vc_mode != KD_TEXT)
+ goto quit;
+
+ /* undraw cursor first */
+ if (con_is_fg(vc))
+ hide_cursor(vc);
+
+ start = (ushort *)vc->vc_pos;
+ start_x = vc->state.x;
+ cnt = 0;
+ while (count--) {
+ c = *b++;
+ if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
+ if (cnt && con_is_visible(vc))
+ vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
+ cnt = 0;
+ if (c == 8) { /* backspace */
+ bs(vc);
+ start = (ushort *)vc->vc_pos;
+ start_x = vc->state.x;
+ continue;
+ }
+ if (c != 13)
+ lf(vc);
+ cr(vc);
+ start = (ushort *)vc->vc_pos;
+ start_x = vc->state.x;
+ if (c == 10 || c == 13)
+ continue;
+ }
+ vc_uniscr_putc(vc, c);
+ scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
+ notify_write(vc, c);
+ cnt++;
+ if (vc->state.x == vc->vc_cols - 1) {
+ vc->vc_need_wrap = 1;
+ } else {
+ vc->vc_pos += 2;
+ vc->state.x++;
+ }
+ }
+ if (cnt && con_is_visible(vc))
+ vc->vc_sw->con_putcs(vc, start, cnt, vc->state.y, start_x);
+ set_cursor(vc);
+ notify_update(vc);
+
+quit:
+ spin_unlock(&printing_lock);
+}
+
+static struct tty_driver *vt_console_device(struct console *c, int *index)
+{
+ *index = c->index ? c->index-1 : fg_console;
+ return console_driver;
+}
+
+static struct console vt_console_driver = {
+ .name = "tty",
+ .write = vt_console_print,
+ .device = vt_console_device,
+ .unblank = unblank_screen,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+#endif
+
+/*
+ * Handling of Linux-specific VC ioctls
+ */
+
+/*
+ * Generally a bit racy with respect to console_lock();.
+ *
+ * There are some functions which don't need it.
+ *
+ * There are some functions which can sleep for arbitrary periods
+ * (paste_selection) but we don't need the lock there anyway.
+ *
+ * set_selection_user has locking, and definitely needs it
+ */
+
+int tioclinux(struct tty_struct *tty, unsigned long arg)
+{
+ char type, data;
+ char __user *p = (char __user *)arg;
+ int lines;
+ int ret;
+
+ if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (get_user(type, p))
+ return -EFAULT;
+ ret = 0;
+
+ switch (type)
+ {
+ case TIOCL_SETSEL:
+ ret = set_selection_user((struct tiocl_selection
+ __user *)(p+1), tty);
+ break;
+ case TIOCL_PASTESEL:
+ ret = paste_selection(tty);
+ break;
+ case TIOCL_UNBLANKSCREEN:
+ console_lock();
+ unblank_screen();
+ console_unlock();
+ break;
+ case TIOCL_SELLOADLUT:
+ console_lock();
+ ret = sel_loadlut(p);
+ console_unlock();
+ break;
+ case TIOCL_GETSHIFTSTATE:
+
+ /*
+ * Make it possible to react to Shift+Mousebutton.
+ * Note that 'shift_state' is an undocumented
+ * kernel-internal variable; programs not closely
+ * related to the kernel should not use this.
+ */
+ data = vt_get_shift_state();
+ ret = put_user(data, p);
+ break;
+ case TIOCL_GETMOUSEREPORTING:
+ console_lock(); /* May be overkill */
+ data = mouse_reporting();
+ console_unlock();
+ ret = put_user(data, p);
+ break;
+ case TIOCL_SETVESABLANK:
+ console_lock();
+ ret = set_vesa_blanking(p);
+ console_unlock();
+ break;
+ case TIOCL_GETKMSGREDIRECT:
+ data = vt_get_kmsg_redirect();
+ ret = put_user(data, p);
+ break;
+ case TIOCL_SETKMSGREDIRECT:
+ if (!capable(CAP_SYS_ADMIN)) {
+ ret = -EPERM;
+ } else {
+ if (get_user(data, p+1))
+ ret = -EFAULT;
+ else
+ vt_kmsg_redirect(data);
+ }
+ break;
+ case TIOCL_GETFGCONSOLE:
+ /* No locking needed as this is a transiently
+ correct return anyway if the caller hasn't
+ disabled switching */
+ ret = fg_console;
+ break;
+ case TIOCL_SCROLLCONSOLE:
+ if (get_user(lines, (s32 __user *)(p+4))) {
+ ret = -EFAULT;
+ } else {
+ /* Need the console lock here. Note that lots
+ of other calls need fixing before the lock
+ is actually useful ! */
+ console_lock();
+ scrollfront(vc_cons[fg_console].d, lines);
+ console_unlock();
+ ret = 0;
+ }
+ break;
+ case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
+ console_lock();
+ ignore_poke = 1;
+ do_blank_screen(0);
+ console_unlock();
+ break;
+ case TIOCL_BLANKEDSCREEN:
+ ret = console_blanked;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+/*
+ * /dev/ttyN handling
+ */
+
+static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ int retval;
+
+ retval = do_con_write(tty, buf, count);
+ con_flush_chars(tty);
+
+ return retval;
+}
+
+static int con_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ return do_con_write(tty, &ch, 1);
+}
+
+static unsigned int con_write_room(struct tty_struct *tty)
+{
+ if (tty->flow.stopped)
+ return 0;
+ return 32768; /* No limit, really; we're not buffering */
+}
+
+/*
+ * con_throttle and con_unthrottle are only used for
+ * paste_selection(), which has to stuff in a large number of
+ * characters...
+ */
+static void con_throttle(struct tty_struct *tty)
+{
+}
+
+static void con_unthrottle(struct tty_struct *tty)
+{
+ struct vc_data *vc = tty->driver_data;
+
+ wake_up_interruptible(&vc->paste_wait);
+}
+
+/*
+ * Turn the Scroll-Lock LED on when the tty is stopped
+ */
+static void con_stop(struct tty_struct *tty)
+{
+ int console_num;
+ if (!tty)
+ return;
+ console_num = tty->index;
+ if (!vc_cons_allocated(console_num))
+ return;
+ vt_kbd_con_stop(console_num);
+}
+
+/*
+ * Turn the Scroll-Lock LED off when the console is started
+ */
+static void con_start(struct tty_struct *tty)
+{
+ int console_num;
+ if (!tty)
+ return;
+ console_num = tty->index;
+ if (!vc_cons_allocated(console_num))
+ return;
+ vt_kbd_con_start(console_num);
+}
+
+static void con_flush_chars(struct tty_struct *tty)
+{
+ struct vc_data *vc;
+
+ if (in_interrupt()) /* from flush_to_ldisc */
+ return;
+
+ /* if we race with con_close(), vt may be null */
+ console_lock();
+ vc = tty->driver_data;
+ if (vc)
+ set_cursor(vc);
+ console_unlock();
+}
+
+/*
+ * Allocate the console screen memory.
+ */
+static int con_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ unsigned int currcons = tty->index;
+ struct vc_data *vc;
+ int ret;
+
+ console_lock();
+ ret = vc_allocate(currcons);
+ if (ret)
+ goto unlock;
+
+ vc = vc_cons[currcons].d;
+
+ /* Still being freed */
+ if (vc->port.tty) {
+ ret = -ERESTARTSYS;
+ goto unlock;
+ }
+
+ ret = tty_port_install(&vc->port, driver, tty);
+ if (ret)
+ goto unlock;
+
+ tty->driver_data = vc;
+ vc->port.tty = tty;
+ tty_port_get(&vc->port);
+
+ if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
+ tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
+ tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
+ }
+ if (vc->vc_utf)
+ tty->termios.c_iflag |= IUTF8;
+ else
+ tty->termios.c_iflag &= ~IUTF8;
+unlock:
+ console_unlock();
+ return ret;
+}
+
+static int con_open(struct tty_struct *tty, struct file *filp)
+{
+ /* everything done in install */
+ return 0;
+}
+
+
+static void con_close(struct tty_struct *tty, struct file *filp)
+{
+ /* Nothing to do - we defer to shutdown */
+}
+
+static void con_shutdown(struct tty_struct *tty)
+{
+ struct vc_data *vc = tty->driver_data;
+ BUG_ON(vc == NULL);
+ console_lock();
+ vc->port.tty = NULL;
+ console_unlock();
+}
+
+static void con_cleanup(struct tty_struct *tty)
+{
+ struct vc_data *vc = tty->driver_data;
+
+ tty_port_put(&vc->port);
+}
+
+static int default_color = 7; /* white */
+static int default_italic_color = 2; // green (ASCII)
+static int default_underline_color = 3; // cyan (ASCII)
+module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
+module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
+module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
+
+static void vc_init(struct vc_data *vc, unsigned int rows,
+ unsigned int cols, int do_clear)
+{
+ int j, k ;
+
+ vc->vc_cols = cols;
+ vc->vc_rows = rows;
+ vc->vc_size_row = cols << 1;
+ vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
+
+ set_origin(vc);
+ vc->vc_pos = vc->vc_origin;
+ reset_vc(vc);
+ for (j=k=0; j<16; j++) {
+ vc->vc_palette[k++] = default_red[j] ;
+ vc->vc_palette[k++] = default_grn[j] ;
+ vc->vc_palette[k++] = default_blu[j] ;
+ }
+ vc->vc_def_color = default_color;
+ vc->vc_ulcolor = default_underline_color;
+ vc->vc_itcolor = default_italic_color;
+ vc->vc_halfcolor = 0x08; /* grey */
+ init_waitqueue_head(&vc->paste_wait);
+ reset_terminal(vc, do_clear);
+}
+
+/*
+ * This routine initializes console interrupts, and does nothing
+ * else. If you want the screen to clear, call tty_write with
+ * the appropriate escape-sequence.
+ */
+
+static int __init con_init(void)
+{
+ const char *display_desc = NULL;
+ struct vc_data *vc;
+ unsigned int currcons = 0, i;
+
+ console_lock();
+
+ if (!conswitchp)
+ conswitchp = &dummy_con;
+ display_desc = conswitchp->con_startup();
+ if (!display_desc) {
+ fg_console = 0;
+ console_unlock();
+ return 0;
+ }
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con_driver = &registered_con_driver[i];
+
+ if (con_driver->con == NULL) {
+ con_driver->con = conswitchp;
+ con_driver->desc = display_desc;
+ con_driver->flag = CON_DRIVER_FLAG_INIT;
+ con_driver->first = 0;
+ con_driver->last = MAX_NR_CONSOLES - 1;
+ break;
+ }
+ }
+
+ for (i = 0; i < MAX_NR_CONSOLES; i++)
+ con_driver_map[i] = conswitchp;
+
+ if (blankinterval) {
+ blank_state = blank_normal_wait;
+ mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+ }
+
+ for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
+ vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
+ INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+ tty_port_init(&vc->port);
+ visual_init(vc, currcons, 1);
+ /* Assuming vc->vc_{cols,rows,screenbuf_size} are sane here. */
+ vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
+ vc_init(vc, vc->vc_rows, vc->vc_cols,
+ currcons || !vc->vc_sw->con_save_screen);
+ }
+ currcons = fg_console = 0;
+ master_display_fg = vc = vc_cons[currcons].d;
+ set_origin(vc);
+ save_screen(vc);
+ gotoxy(vc, vc->state.x, vc->state.y);
+ csi_J(vc, 0);
+ update_screen(vc);
+ pr_info("Console: %s %s %dx%d\n",
+ vc->vc_can_do_color ? "colour" : "mono",
+ display_desc, vc->vc_cols, vc->vc_rows);
+
+ console_unlock();
+
+#ifdef CONFIG_VT_CONSOLE
+ register_console(&vt_console_driver);
+#endif
+ return 0;
+}
+console_initcall(con_init);
+
+static const struct tty_operations con_ops = {
+ .install = con_install,
+ .open = con_open,
+ .close = con_close,
+ .write = con_write,
+ .write_room = con_write_room,
+ .put_char = con_put_char,
+ .flush_chars = con_flush_chars,
+ .ioctl = vt_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vt_compat_ioctl,
+#endif
+ .stop = con_stop,
+ .start = con_start,
+ .throttle = con_throttle,
+ .unthrottle = con_unthrottle,
+ .resize = vt_resize,
+ .shutdown = con_shutdown,
+ .cleanup = con_cleanup,
+};
+
+static struct cdev vc0_cdev;
+
+static ssize_t show_tty_active(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "tty%d\n", fg_console + 1);
+}
+static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
+
+static struct attribute *vt_dev_attrs[] = {
+ &dev_attr_active.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(vt_dev);
+
+int __init vty_init(const struct file_operations *console_fops)
+{
+ cdev_init(&vc0_cdev, console_fops);
+ if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
+ register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
+ panic("Couldn't register /dev/tty0 driver\n");
+ tty0dev = device_create_with_groups(tty_class, NULL,
+ MKDEV(TTY_MAJOR, 0), NULL,
+ vt_dev_groups, "tty0");
+ if (IS_ERR(tty0dev))
+ tty0dev = NULL;
+
+ vcs_init();
+
+ console_driver = tty_alloc_driver(MAX_NR_CONSOLES, TTY_DRIVER_REAL_RAW |
+ TTY_DRIVER_RESET_TERMIOS);
+ if (IS_ERR(console_driver))
+ panic("Couldn't allocate console driver\n");
+
+ console_driver->name = "tty";
+ console_driver->name_base = 1;
+ console_driver->major = TTY_MAJOR;
+ console_driver->minor_start = 1;
+ console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
+ console_driver->init_termios = tty_std_termios;
+ if (default_utf8)
+ console_driver->init_termios.c_iflag |= IUTF8;
+ tty_set_operations(console_driver, &con_ops);
+ if (tty_register_driver(console_driver))
+ panic("Couldn't register console driver\n");
+ kbd_init();
+ console_map_init();
+#ifdef CONFIG_MDA_CONSOLE
+ mda_console_init();
+#endif
+ return 0;
+}
+
+#ifndef VT_SINGLE_DRIVER
+
+static struct class *vtconsole_class;
+
+static int do_bind_con_driver(const struct consw *csw, int first, int last,
+ int deflt)
+{
+ struct module *owner = csw->owner;
+ const char *desc = NULL;
+ struct con_driver *con_driver;
+ int i, j = -1, k = -1, retval = -ENODEV;
+
+ if (!try_module_get(owner))
+ return -ENODEV;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ /* check if driver is registered */
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ con_driver = &registered_con_driver[i];
+
+ if (con_driver->con == csw) {
+ desc = con_driver->desc;
+ retval = 0;
+ break;
+ }
+ }
+
+ if (retval)
+ goto err;
+
+ if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
+ csw->con_startup();
+ con_driver->flag |= CON_DRIVER_FLAG_INIT;
+ }
+
+ if (deflt) {
+ if (conswitchp)
+ module_put(conswitchp->owner);
+
+ __module_get(owner);
+ conswitchp = csw;
+ }
+
+ first = max(first, con_driver->first);
+ last = min(last, con_driver->last);
+
+ for (i = first; i <= last; i++) {
+ int old_was_color;
+ struct vc_data *vc = vc_cons[i].d;
+
+ if (con_driver_map[i])
+ module_put(con_driver_map[i]->owner);
+ __module_get(owner);
+ con_driver_map[i] = csw;
+
+ if (!vc || !vc->vc_sw)
+ continue;
+
+ j = i;
+
+ if (con_is_visible(vc)) {
+ k = i;
+ save_screen(vc);
+ }
+
+ old_was_color = vc->vc_can_do_color;
+ vc->vc_sw->con_deinit(vc);
+ vc->vc_origin = (unsigned long)vc->vc_screenbuf;
+ visual_init(vc, i, 0);
+ set_origin(vc);
+ update_attr(vc);
+
+ /* If the console changed between mono <-> color, then
+ * the attributes in the screenbuf will be wrong. The
+ * following resets all attributes to something sane.
+ */
+ if (old_was_color != vc->vc_can_do_color)
+ clear_buffer_attributes(vc);
+ }
+
+ pr_info("Console: switching ");
+ if (!deflt)
+ pr_cont("consoles %d-%d ", first + 1, last + 1);
+ if (j >= 0) {
+ struct vc_data *vc = vc_cons[j].d;
+
+ pr_cont("to %s %s %dx%d\n",
+ vc->vc_can_do_color ? "colour" : "mono",
+ desc, vc->vc_cols, vc->vc_rows);
+
+ if (k >= 0) {
+ vc = vc_cons[k].d;
+ update_screen(vc);
+ }
+ } else {
+ pr_cont("to %s\n", desc);
+ }
+
+ retval = 0;
+err:
+ module_put(owner);
+ return retval;
+};
+
+
+#ifdef CONFIG_VT_HW_CONSOLE_BINDING
+int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
+{
+ struct module *owner = csw->owner;
+ const struct consw *defcsw = NULL;
+ struct con_driver *con_driver = NULL, *con_back = NULL;
+ int i, retval = -ENODEV;
+
+ if (!try_module_get(owner))
+ return -ENODEV;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ /* check if driver is registered and if it is unbindable */
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ con_driver = &registered_con_driver[i];
+
+ if (con_driver->con == csw &&
+ con_driver->flag & CON_DRIVER_FLAG_MODULE) {
+ retval = 0;
+ break;
+ }
+ }
+
+ if (retval)
+ goto err;
+
+ retval = -ENODEV;
+
+ /* check if backup driver exists */
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ con_back = &registered_con_driver[i];
+
+ if (con_back->con && con_back->con != csw) {
+ defcsw = con_back->con;
+ retval = 0;
+ break;
+ }
+ }
+
+ if (retval)
+ goto err;
+
+ if (!con_is_bound(csw))
+ goto err;
+
+ first = max(first, con_driver->first);
+ last = min(last, con_driver->last);
+
+ for (i = first; i <= last; i++) {
+ if (con_driver_map[i] == csw) {
+ module_put(csw->owner);
+ con_driver_map[i] = NULL;
+ }
+ }
+
+ if (!con_is_bound(defcsw)) {
+ const struct consw *defconsw = conswitchp;
+
+ defcsw->con_startup();
+ con_back->flag |= CON_DRIVER_FLAG_INIT;
+ /*
+ * vgacon may change the default driver to point
+ * to dummycon, we restore it here...
+ */
+ conswitchp = defconsw;
+ }
+
+ if (!con_is_bound(csw))
+ con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
+
+ /* ignore return value, binding should not fail */
+ do_bind_con_driver(defcsw, first, last, deflt);
+err:
+ module_put(owner);
+ return retval;
+
+}
+EXPORT_SYMBOL_GPL(do_unbind_con_driver);
+
+static int vt_bind(struct con_driver *con)
+{
+ const struct consw *defcsw = NULL, *csw = NULL;
+ int i, more = 1, first = -1, last = -1, deflt = 0;
+
+ if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
+ goto err;
+
+ csw = con->con;
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con = &registered_con_driver[i];
+
+ if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
+ defcsw = con->con;
+ break;
+ }
+ }
+
+ if (!defcsw)
+ goto err;
+
+ while (more) {
+ more = 0;
+
+ for (i = con->first; i <= con->last; i++) {
+ if (con_driver_map[i] == defcsw) {
+ if (first == -1)
+ first = i;
+ last = i;
+ more = 1;
+ } else if (first != -1)
+ break;
+ }
+
+ if (first == 0 && last == MAX_NR_CONSOLES -1)
+ deflt = 1;
+
+ if (first != -1)
+ do_bind_con_driver(csw, first, last, deflt);
+
+ first = -1;
+ last = -1;
+ deflt = 0;
+ }
+
+err:
+ return 0;
+}
+
+static int vt_unbind(struct con_driver *con)
+{
+ const struct consw *csw = NULL;
+ int i, more = 1, first = -1, last = -1, deflt = 0;
+ int ret;
+
+ if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE))
+ goto err;
+
+ csw = con->con;
+
+ while (more) {
+ more = 0;
+
+ for (i = con->first; i <= con->last; i++) {
+ if (con_driver_map[i] == csw) {
+ if (first == -1)
+ first = i;
+ last = i;
+ more = 1;
+ } else if (first != -1)
+ break;
+ }
+
+ if (first == 0 && last == MAX_NR_CONSOLES -1)
+ deflt = 1;
+
+ if (first != -1) {
+ ret = do_unbind_con_driver(csw, first, last, deflt);
+ if (ret != 0)
+ return ret;
+ }
+
+ first = -1;
+ last = -1;
+ deflt = 0;
+ }
+
+err:
+ return 0;
+}
+#else
+static inline int vt_bind(struct con_driver *con)
+{
+ return 0;
+}
+static inline int vt_unbind(struct con_driver *con)
+{
+ return 0;
+}
+#endif /* CONFIG_VT_HW_CONSOLE_BINDING */
+
+static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct con_driver *con = dev_get_drvdata(dev);
+ int bind = simple_strtoul(buf, NULL, 0);
+
+ console_lock();
+
+ if (bind)
+ vt_bind(con);
+ else
+ vt_unbind(con);
+
+ console_unlock();
+
+ return count;
+}
+
+static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct con_driver *con = dev_get_drvdata(dev);
+ int bind;
+
+ console_lock();
+ bind = con_is_bound(con->con);
+ console_unlock();
+
+ return sysfs_emit(buf, "%i\n", bind);
+}
+
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct con_driver *con = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%s %s\n",
+ (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
+ con->desc);
+
+}
+
+static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind);
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static struct attribute *con_dev_attrs[] = {
+ &dev_attr_bind.attr,
+ &dev_attr_name.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(con_dev);
+
+static int vtconsole_init_device(struct con_driver *con)
+{
+ con->flag |= CON_DRIVER_FLAG_ATTR;
+ return 0;
+}
+
+static void vtconsole_deinit_device(struct con_driver *con)
+{
+ con->flag &= ~CON_DRIVER_FLAG_ATTR;
+}
+
+/**
+ * con_is_bound - checks if driver is bound to the console
+ * @csw: console driver
+ *
+ * RETURNS: zero if unbound, nonzero if bound
+ *
+ * Drivers can call this and if zero, they should release
+ * all resources allocated on con_startup()
+ */
+int con_is_bound(const struct consw *csw)
+{
+ int i, bound = 0;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ for (i = 0; i < MAX_NR_CONSOLES; i++) {
+ if (con_driver_map[i] == csw) {
+ bound = 1;
+ break;
+ }
+ }
+
+ return bound;
+}
+EXPORT_SYMBOL(con_is_bound);
+
+/**
+ * con_is_visible - checks whether the current console is visible
+ * @vc: virtual console
+ *
+ * RETURNS: zero if not visible, nonzero if visible
+ */
+bool con_is_visible(const struct vc_data *vc)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ return *vc->vc_display_fg == vc;
+}
+EXPORT_SYMBOL(con_is_visible);
+
+/**
+ * con_debug_enter - prepare the console for the kernel debugger
+ * @vc: virtual console
+ *
+ * Called when the console is taken over by the kernel debugger, this
+ * function needs to save the current console state, then put the console
+ * into a state suitable for the kernel debugger.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to prepare
+ * the console for the debugger.
+ */
+int con_debug_enter(struct vc_data *vc)
+{
+ int ret = 0;
+
+ saved_fg_console = fg_console;
+ saved_last_console = last_console;
+ saved_want_console = want_console;
+ saved_vc_mode = vc->vc_mode;
+ saved_console_blanked = console_blanked;
+ vc->vc_mode = KD_TEXT;
+ console_blanked = 0;
+ if (vc->vc_sw->con_debug_enter)
+ ret = vc->vc_sw->con_debug_enter(vc);
+#ifdef CONFIG_KGDB_KDB
+ /* Set the initial LINES variable if it is not already set */
+ if (vc->vc_rows < 999) {
+ int linecount;
+ char lns[4];
+ const char *setargs[3] = {
+ "set",
+ "LINES",
+ lns,
+ };
+ if (kdbgetintenv(setargs[0], &linecount)) {
+ snprintf(lns, 4, "%i", vc->vc_rows);
+ kdb_set(2, setargs);
+ }
+ }
+ if (vc->vc_cols < 999) {
+ int colcount;
+ char cols[4];
+ const char *setargs[3] = {
+ "set",
+ "COLUMNS",
+ cols,
+ };
+ if (kdbgetintenv(setargs[0], &colcount)) {
+ snprintf(cols, 4, "%i", vc->vc_cols);
+ kdb_set(2, setargs);
+ }
+ }
+#endif /* CONFIG_KGDB_KDB */
+ return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_enter);
+
+/**
+ * con_debug_leave - restore console state
+ *
+ * Restore the console state to what it was before the kernel debugger
+ * was invoked.
+ *
+ * RETURNS:
+ * Zero on success, nonzero if a failure occurred when trying to restore
+ * the console.
+ */
+int con_debug_leave(void)
+{
+ struct vc_data *vc;
+ int ret = 0;
+
+ fg_console = saved_fg_console;
+ last_console = saved_last_console;
+ want_console = saved_want_console;
+ console_blanked = saved_console_blanked;
+ vc_cons[fg_console].d->vc_mode = saved_vc_mode;
+
+ vc = vc_cons[fg_console].d;
+ if (vc->vc_sw->con_debug_leave)
+ ret = vc->vc_sw->con_debug_leave(vc);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(con_debug_leave);
+
+static int do_register_con_driver(const struct consw *csw, int first, int last)
+{
+ struct module *owner = csw->owner;
+ struct con_driver *con_driver;
+ const char *desc;
+ int i, retval;
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (!try_module_get(owner))
+ return -ENODEV;
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ con_driver = &registered_con_driver[i];
+
+ /* already registered */
+ if (con_driver->con == csw) {
+ retval = -EBUSY;
+ goto err;
+ }
+ }
+
+ desc = csw->con_startup();
+ if (!desc) {
+ retval = -ENODEV;
+ goto err;
+ }
+
+ retval = -EINVAL;
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ con_driver = &registered_con_driver[i];
+
+ if (con_driver->con == NULL &&
+ !(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE)) {
+ con_driver->con = csw;
+ con_driver->desc = desc;
+ con_driver->node = i;
+ con_driver->flag = CON_DRIVER_FLAG_MODULE |
+ CON_DRIVER_FLAG_INIT;
+ con_driver->first = first;
+ con_driver->last = last;
+ retval = 0;
+ break;
+ }
+ }
+
+ if (retval)
+ goto err;
+
+ con_driver->dev =
+ device_create_with_groups(vtconsole_class, NULL,
+ MKDEV(0, con_driver->node),
+ con_driver, con_dev_groups,
+ "vtcon%i", con_driver->node);
+ if (IS_ERR(con_driver->dev)) {
+ pr_warn("Unable to create device for %s; errno = %ld\n",
+ con_driver->desc, PTR_ERR(con_driver->dev));
+ con_driver->dev = NULL;
+ } else {
+ vtconsole_init_device(con_driver);
+ }
+
+err:
+ module_put(owner);
+ return retval;
+}
+
+
+/**
+ * do_unregister_con_driver - unregister console driver from console layer
+ * @csw: console driver
+ *
+ * DESCRIPTION: All drivers that registers to the console layer must
+ * call this function upon exit, or if the console driver is in a state
+ * where it won't be able to handle console services, such as the
+ * framebuffer console without loaded framebuffer drivers.
+ *
+ * The driver must unbind first prior to unregistration.
+ */
+int do_unregister_con_driver(const struct consw *csw)
+{
+ int i;
+
+ /* cannot unregister a bound driver */
+ if (con_is_bound(csw))
+ return -EBUSY;
+
+ if (csw == conswitchp)
+ return -EINVAL;
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con_driver = &registered_con_driver[i];
+
+ if (con_driver->con == csw) {
+ /*
+ * Defer the removal of the sysfs entries since that
+ * will acquire the kernfs s_active lock and we can't
+ * acquire this lock while holding the console lock:
+ * the unbind sysfs entry imposes already the opposite
+ * order. Reset con already here to prevent any later
+ * lookup to succeed and mark this slot as zombie, so
+ * it won't get reused until we complete the removal
+ * in the deferred work.
+ */
+ con_driver->con = NULL;
+ con_driver->flag = CON_DRIVER_FLAG_ZOMBIE;
+ schedule_work(&con_driver_unregister_work);
+
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(do_unregister_con_driver);
+
+static void con_driver_unregister_callback(struct work_struct *ignored)
+{
+ int i;
+
+ console_lock();
+
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con_driver = &registered_con_driver[i];
+
+ if (!(con_driver->flag & CON_DRIVER_FLAG_ZOMBIE))
+ continue;
+
+ console_unlock();
+
+ vtconsole_deinit_device(con_driver);
+ device_destroy(vtconsole_class, MKDEV(0, con_driver->node));
+
+ console_lock();
+
+ if (WARN_ON_ONCE(con_driver->con))
+ con_driver->con = NULL;
+ con_driver->desc = NULL;
+ con_driver->dev = NULL;
+ con_driver->node = 0;
+ WARN_ON_ONCE(con_driver->flag != CON_DRIVER_FLAG_ZOMBIE);
+ con_driver->flag = 0;
+ con_driver->first = 0;
+ con_driver->last = 0;
+ }
+
+ console_unlock();
+}
+
+/*
+ * If we support more console drivers, this function is used
+ * when a driver wants to take over some existing consoles
+ * and become default driver for newly opened ones.
+ *
+ * do_take_over_console is basically a register followed by bind
+ */
+int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
+{
+ int err;
+
+ err = do_register_con_driver(csw, first, last);
+ /*
+ * If we get an busy error we still want to bind the console driver
+ * and return success, as we may have unbound the console driver
+ * but not unregistered it.
+ */
+ if (err == -EBUSY)
+ err = 0;
+ if (!err)
+ do_bind_con_driver(csw, first, last, deflt);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(do_take_over_console);
+
+
+/*
+ * give_up_console is a wrapper to unregister_con_driver. It will only
+ * work if driver is fully unbound.
+ */
+void give_up_console(const struct consw *csw)
+{
+ console_lock();
+ do_unregister_con_driver(csw);
+ console_unlock();
+}
+
+static int __init vtconsole_class_init(void)
+{
+ int i;
+
+ vtconsole_class = class_create(THIS_MODULE, "vtconsole");
+ if (IS_ERR(vtconsole_class)) {
+ pr_warn("Unable to create vt console class; errno = %ld\n",
+ PTR_ERR(vtconsole_class));
+ vtconsole_class = NULL;
+ }
+
+ /* Add system drivers to sysfs */
+ for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
+ struct con_driver *con = &registered_con_driver[i];
+
+ if (con->con && !con->dev) {
+ con->dev =
+ device_create_with_groups(vtconsole_class, NULL,
+ MKDEV(0, con->node),
+ con, con_dev_groups,
+ "vtcon%i", con->node);
+
+ if (IS_ERR(con->dev)) {
+ pr_warn("Unable to create device for %s; errno = %ld\n",
+ con->desc, PTR_ERR(con->dev));
+ con->dev = NULL;
+ } else {
+ vtconsole_init_device(con);
+ }
+ }
+ }
+
+ return 0;
+}
+postcore_initcall(vtconsole_class_init);
+
+#endif
+
+/*
+ * Screen blanking
+ */
+
+static int set_vesa_blanking(char __user *p)
+{
+ unsigned int mode;
+
+ if (get_user(mode, p + 1))
+ return -EFAULT;
+
+ vesa_blank_mode = (mode < 4) ? mode : 0;
+ return 0;
+}
+
+void do_blank_screen(int entering_gfx)
+{
+ struct vc_data *vc = vc_cons[fg_console].d;
+ int i;
+
+ might_sleep();
+
+ WARN_CONSOLE_UNLOCKED();
+
+ if (console_blanked) {
+ if (blank_state == blank_vesa_wait) {
+ blank_state = blank_off;
+ vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
+ }
+ return;
+ }
+
+ /* entering graphics mode? */
+ if (entering_gfx) {
+ hide_cursor(vc);
+ save_screen(vc);
+ vc->vc_sw->con_blank(vc, -1, 1);
+ console_blanked = fg_console + 1;
+ blank_state = blank_off;
+ set_origin(vc);
+ return;
+ }
+
+ blank_state = blank_off;
+
+ /* don't blank graphics */
+ if (vc->vc_mode != KD_TEXT) {
+ console_blanked = fg_console + 1;
+ return;
+ }
+
+ hide_cursor(vc);
+ del_timer_sync(&console_timer);
+ blank_timer_expired = 0;
+
+ save_screen(vc);
+ /* In case we need to reset origin, blanking hook returns 1 */
+ i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
+ console_blanked = fg_console + 1;
+ if (i)
+ set_origin(vc);
+
+ if (console_blank_hook && console_blank_hook(1))
+ return;
+
+ if (vesa_off_interval && vesa_blank_mode) {
+ blank_state = blank_vesa_wait;
+ mod_timer(&console_timer, jiffies + vesa_off_interval);
+ }
+ vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_blank_screen);
+
+/*
+ * Called by timer as well as from vt_console_driver
+ */
+void do_unblank_screen(int leaving_gfx)
+{
+ struct vc_data *vc;
+
+ /* This should now always be called from a "sane" (read: can schedule)
+ * context for the sake of the low level drivers, except in the special
+ * case of oops_in_progress
+ */
+ if (!oops_in_progress)
+ might_sleep();
+
+ WARN_CONSOLE_UNLOCKED();
+
+ ignore_poke = 0;
+ if (!console_blanked)
+ return;
+ if (!vc_cons_allocated(fg_console)) {
+ /* impossible */
+ pr_warn("unblank_screen: tty %d not allocated ??\n",
+ fg_console + 1);
+ return;
+ }
+ vc = vc_cons[fg_console].d;
+ if (vc->vc_mode != KD_TEXT)
+ return; /* but leave console_blanked != 0 */
+
+ if (blankinterval) {
+ mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+ blank_state = blank_normal_wait;
+ }
+
+ console_blanked = 0;
+ if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
+ /* Low-level driver cannot restore -> do it ourselves */
+ update_screen(vc);
+ if (console_blank_hook)
+ console_blank_hook(0);
+ set_palette(vc);
+ set_cursor(vc);
+ vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
+}
+EXPORT_SYMBOL(do_unblank_screen);
+
+/*
+ * This is called by the outside world to cause a forced unblank, mostly for
+ * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
+ * call it with 1 as an argument and so force a mode restore... that may kill
+ * X or at least garbage the screen but would also make the Oops visible...
+ */
+static void unblank_screen(void)
+{
+ do_unblank_screen(0);
+}
+
+/*
+ * We defer the timer blanking to work queue so it can take the console mutex
+ * (console operations can still happen at irq time, but only from printk which
+ * has the console mutex. Not perfect yet, but better than no locking
+ */
+static void blank_screen_t(struct timer_list *unused)
+{
+ blank_timer_expired = 1;
+ schedule_work(&console_work);
+}
+
+void poke_blanked_console(void)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ /* Add this so we quickly catch whoever might call us in a non
+ * safe context. Nowadays, unblank_screen() isn't to be called in
+ * atomic contexts and is allowed to schedule (with the special case
+ * of oops_in_progress, but that isn't of any concern for this
+ * function. --BenH.
+ */
+ might_sleep();
+
+ /* This isn't perfectly race free, but a race here would be mostly harmless,
+ * at worst, we'll do a spurious blank and it's unlikely
+ */
+ del_timer(&console_timer);
+ blank_timer_expired = 0;
+
+ if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
+ return;
+ if (console_blanked)
+ unblank_screen();
+ else if (blankinterval) {
+ mod_timer(&console_timer, jiffies + (blankinterval * HZ));
+ blank_state = blank_normal_wait;
+ }
+}
+
+/*
+ * Palettes
+ */
+
+static void set_palette(struct vc_data *vc)
+{
+ WARN_CONSOLE_UNLOCKED();
+
+ if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_set_palette)
+ vc->vc_sw->con_set_palette(vc, color_table);
+}
+
+/*
+ * Load palette into the DAC registers. arg points to a colour
+ * map, 3 bytes per colour, 16 colours, range from 0 to 255.
+ */
+
+int con_set_cmap(unsigned char __user *arg)
+{
+ int i, j, k;
+ unsigned char colormap[3*16];
+
+ if (copy_from_user(colormap, arg, sizeof(colormap)))
+ return -EFAULT;
+
+ console_lock();
+ for (i = k = 0; i < 16; i++) {
+ default_red[i] = colormap[k++];
+ default_grn[i] = colormap[k++];
+ default_blu[i] = colormap[k++];
+ }
+ for (i = 0; i < MAX_NR_CONSOLES; i++) {
+ if (!vc_cons_allocated(i))
+ continue;
+ for (j = k = 0; j < 16; j++) {
+ vc_cons[i].d->vc_palette[k++] = default_red[j];
+ vc_cons[i].d->vc_palette[k++] = default_grn[j];
+ vc_cons[i].d->vc_palette[k++] = default_blu[j];
+ }
+ set_palette(vc_cons[i].d);
+ }
+ console_unlock();
+
+ return 0;
+}
+
+int con_get_cmap(unsigned char __user *arg)
+{
+ int i, k;
+ unsigned char colormap[3*16];
+
+ console_lock();
+ for (i = k = 0; i < 16; i++) {
+ colormap[k++] = default_red[i];
+ colormap[k++] = default_grn[i];
+ colormap[k++] = default_blu[i];
+ }
+ console_unlock();
+
+ if (copy_to_user(arg, colormap, sizeof(colormap)))
+ return -EFAULT;
+
+ return 0;
+}
+
+void reset_palette(struct vc_data *vc)
+{
+ int j, k;
+ for (j=k=0; j<16; j++) {
+ vc->vc_palette[k++] = default_red[j];
+ vc->vc_palette[k++] = default_grn[j];
+ vc->vc_palette[k++] = default_blu[j];
+ }
+ set_palette(vc);
+}
+
+/*
+ * Font switching
+ *
+ * Currently we only support fonts up to 32 pixels wide, at a maximum height
+ * of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
+ * depending on width) reserved for each character which is kinda wasty, but
+ * this is done in order to maintain compatibility with the EGA/VGA fonts. It
+ * is up to the actual low-level console-driver convert data into its favorite
+ * format (maybe we should add a `fontoffset' field to the `display'
+ * structure so we won't have to convert the fontdata all the time.
+ * /Jes
+ */
+
+#define max_font_size 65536
+
+static int con_font_get(struct vc_data *vc, struct console_font_op *op)
+{
+ struct console_font font;
+ int rc = -EINVAL;
+ int c;
+
+ if (op->data) {
+ font.data = kmalloc(max_font_size, GFP_KERNEL);
+ if (!font.data)
+ return -ENOMEM;
+ } else
+ font.data = NULL;
+
+ console_lock();
+ if (vc->vc_mode != KD_TEXT)
+ rc = -EINVAL;
+ else if (vc->vc_sw->con_font_get)
+ rc = vc->vc_sw->con_font_get(vc, &font);
+ else
+ rc = -ENOSYS;
+ console_unlock();
+
+ if (rc)
+ goto out;
+
+ c = (font.width+7)/8 * 32 * font.charcount;
+
+ if (op->data && font.charcount > op->charcount)
+ rc = -ENOSPC;
+ if (font.width > op->width || font.height > op->height)
+ rc = -ENOSPC;
+ if (rc)
+ goto out;
+
+ op->height = font.height;
+ op->width = font.width;
+ op->charcount = font.charcount;
+
+ if (op->data && copy_to_user(op->data, font.data, c))
+ rc = -EFAULT;
+
+out:
+ kfree(font.data);
+ return rc;
+}
+
+static int con_font_set(struct vc_data *vc, struct console_font_op *op)
+{
+ struct console_font font;
+ int rc = -EINVAL;
+ int size;
+
+ if (vc->vc_mode != KD_TEXT)
+ return -EINVAL;
+ if (!op->data)
+ return -EINVAL;
+ if (op->charcount > 512)
+ return -EINVAL;
+ if (op->width <= 0 || op->width > 32 || !op->height || op->height > 32)
+ return -EINVAL;
+ size = (op->width+7)/8 * 32 * op->charcount;
+ if (size > max_font_size)
+ return -ENOSPC;
+
+ font.data = memdup_user(op->data, size);
+ if (IS_ERR(font.data))
+ return PTR_ERR(font.data);
+
+ font.charcount = op->charcount;
+ font.width = op->width;
+ font.height = op->height;
+
+ console_lock();
+ if (vc->vc_mode != KD_TEXT)
+ rc = -EINVAL;
+ else if (vc->vc_sw->con_font_set) {
+ if (vc_is_sel(vc))
+ clear_selection();
+ rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
+ } else
+ rc = -ENOSYS;
+ console_unlock();
+ kfree(font.data);
+ return rc;
+}
+
+static int con_font_default(struct vc_data *vc, struct console_font_op *op)
+{
+ struct console_font font = {.width = op->width, .height = op->height};
+ char name[MAX_FONT_NAME];
+ char *s = name;
+ int rc;
+
+
+ if (!op->data)
+ s = NULL;
+ else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
+ return -EFAULT;
+ else
+ name[MAX_FONT_NAME - 1] = 0;
+
+ console_lock();
+ if (vc->vc_mode != KD_TEXT) {
+ console_unlock();
+ return -EINVAL;
+ }
+ if (vc->vc_sw->con_font_default) {
+ if (vc_is_sel(vc))
+ clear_selection();
+ rc = vc->vc_sw->con_font_default(vc, &font, s);
+ } else
+ rc = -ENOSYS;
+ console_unlock();
+ if (!rc) {
+ op->width = font.width;
+ op->height = font.height;
+ }
+ return rc;
+}
+
+int con_font_op(struct vc_data *vc, struct console_font_op *op)
+{
+ switch (op->op) {
+ case KD_FONT_OP_SET:
+ return con_font_set(vc, op);
+ case KD_FONT_OP_GET:
+ return con_font_get(vc, op);
+ case KD_FONT_OP_SET_DEFAULT:
+ return con_font_default(vc, op);
+ case KD_FONT_OP_COPY:
+ /* was buggy and never really used */
+ return -EINVAL;
+ }
+ return -ENOSYS;
+}
+
+/*
+ * Interface exported to selection and vcs.
+ */
+
+/* used by selection */
+u16 screen_glyph(const struct vc_data *vc, int offset)
+{
+ u16 w = scr_readw(screenpos(vc, offset, true));
+ u16 c = w & 0xff;
+
+ if (w & vc->vc_hi_font_mask)
+ c |= 0x100;
+ return c;
+}
+EXPORT_SYMBOL_GPL(screen_glyph);
+
+u32 screen_glyph_unicode(const struct vc_data *vc, int n)
+{
+ struct uni_screen *uniscr = get_vc_uniscr(vc);
+
+ if (uniscr)
+ return uniscr->lines[n / vc->vc_cols][n % vc->vc_cols];
+ return inverse_translate(vc, screen_glyph(vc, n * 2), true);
+}
+EXPORT_SYMBOL_GPL(screen_glyph_unicode);
+
+/* used by vcs - note the word offset */
+unsigned short *screen_pos(const struct vc_data *vc, int w_offset, bool viewed)
+{
+ return screenpos(vc, 2 * w_offset, viewed);
+}
+EXPORT_SYMBOL_GPL(screen_pos);
+
+void getconsxy(const struct vc_data *vc, unsigned char xy[static 2])
+{
+ /* clamp values if they don't fit */
+ xy[0] = min(vc->state.x, 0xFFu);
+ xy[1] = min(vc->state.y, 0xFFu);
+}
+
+void putconsxy(struct vc_data *vc, unsigned char xy[static const 2])
+{
+ hide_cursor(vc);
+ gotoxy(vc, xy[0], xy[1]);
+ set_cursor(vc);
+}
+
+u16 vcs_scr_readw(const struct vc_data *vc, const u16 *org)
+{
+ if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
+ return softcursor_original;
+ return scr_readw(org);
+}
+
+void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
+{
+ scr_writew(val, org);
+ if ((unsigned long)org == vc->vc_pos) {
+ softcursor_original = -1;
+ add_softcursor(vc);
+ }
+}
+
+void vcs_scr_updated(struct vc_data *vc)
+{
+ notify_update(vc);
+}
+
+void vc_scrolldelta_helper(struct vc_data *c, int lines,
+ unsigned int rolled_over, void *base, unsigned int size)
+{
+ unsigned long ubase = (unsigned long)base;
+ ptrdiff_t scr_end = (void *)c->vc_scr_end - base;
+ ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
+ ptrdiff_t origin = (void *)c->vc_origin - base;
+ int margin = c->vc_size_row * 4;
+ int from, wrap, from_off, avail;
+
+ /* Turn scrollback off */
+ if (!lines) {
+ c->vc_visible_origin = c->vc_origin;
+ return;
+ }
+
+ /* Do we have already enough to allow jumping from 0 to the end? */
+ if (rolled_over > scr_end + margin) {
+ from = scr_end;
+ wrap = rolled_over + c->vc_size_row;
+ } else {
+ from = 0;
+ wrap = size;
+ }
+
+ from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
+ avail = (origin - from + wrap) % wrap;
+
+ /* Only a little piece would be left? Show all incl. the piece! */
+ if (avail < 2 * margin)
+ margin = 0;
+ if (from_off < margin)
+ from_off = 0;
+ if (from_off > avail - margin)
+ from_off = avail;
+
+ c->vc_visible_origin = ubase + (from + from_off) % wrap;
+}
+EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
+
+/*
+ * Visible symbols for modules
+ */
+
+EXPORT_SYMBOL(color_table);
+EXPORT_SYMBOL(default_red);
+EXPORT_SYMBOL(default_grn);
+EXPORT_SYMBOL(default_blu);
+EXPORT_SYMBOL(update_region);
+EXPORT_SYMBOL(redraw_screen);
+EXPORT_SYMBOL(vc_resize);
+EXPORT_SYMBOL(fg_console);
+EXPORT_SYMBOL(console_blank_hook);
+EXPORT_SYMBOL(console_blanked);
+EXPORT_SYMBOL(vc_cons);
+EXPORT_SYMBOL(global_cursor_default);
+#ifndef VT_SINGLE_DRIVER
+EXPORT_SYMBOL(give_up_console);
+#endif