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path: root/drivers/char/vt.c
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Diffstat (limited to 'drivers/char/vt.c')
-rw-r--r--drivers/char/vt.c60
1 files changed, 54 insertions, 6 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index edb7002a321..7a5badfb7d8 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -99,6 +99,7 @@
#include <linux/pm.h>
#include <linux/font.h>
#include <linux/bitops.h>
+#include <linux/notifier.h>
#include <asm/io.h>
#include <asm/system.h>
@@ -158,7 +159,7 @@ static void blank_screen_t(unsigned long dummy);
static void set_palette(struct vc_data *vc);
static int printable; /* Is console ready for printing? */
-static int default_utf8;
+int default_utf8 = true;
module_param(default_utf8, int, S_IRUGO | S_IWUSR);
/*
@@ -223,6 +224,35 @@ enum {
};
/*
+ * 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, unicode = 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
*/
@@ -718,6 +748,7 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
return -ENXIO;
if (!vc_cons[currcons].d) {
struct vc_data *vc;
+ struct vt_notifier_param param;
/* prevent users from taking too much memory */
if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
@@ -729,7 +760,7 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
/* 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 */
- vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
+ param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
if (!vc)
return -ENOMEM;
vc_cons[currcons].d = vc;
@@ -746,17 +777,20 @@ int vc_allocate(unsigned int currcons) /* return 0 on success */
}
vc->vc_kmalloced = 1;
vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
+ atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
}
return 0;
}
-static inline int resize_screen(struct vc_data *vc, int width, int height)
+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_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
- err = vc->vc_sw->con_resize(vc, width, height);
+ err = vc->vc_sw->con_resize(vc, width, height, user);
+
return err;
}
@@ -772,7 +806,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
unsigned int old_cols, old_rows, old_row_size, old_screen_size;
unsigned int new_cols, new_rows, new_row_size, new_screen_size;
- unsigned int end;
+ unsigned int end, user;
unsigned short *newscreen;
WARN_CONSOLE_UNLOCKED();
@@ -780,6 +814,9 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
if (!vc)
return -ENXIO;
+ user = vc->vc_resize_user;
+ vc->vc_resize_user = 0;
+
if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
return -EINVAL;
@@ -800,7 +837,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
old_row_size = vc->vc_size_row;
old_screen_size = vc->vc_screenbuf_size;
- err = resize_screen(vc, new_cols, new_rows);
+ err = resize_screen(vc, new_cols, new_rows, user);
if (err) {
kfree(newscreen);
return err;
@@ -902,6 +939,8 @@ void vc_deallocate(unsigned int currcons)
if (vc_cons_allocated(currcons)) {
struct vc_data *vc = vc_cons[currcons].d;
+ struct vt_notifier_param param = { .vc = vc };
+ atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
vc->vc_sw->con_deinit(vc);
put_pid(vc->vt_pid);
module_put(vc->vc_sw->owner);
@@ -1014,6 +1053,7 @@ static void lf(struct vc_data *vc)
vc->vc_pos += vc->vc_size_row;
}
vc->vc_need_wrap = 0;
+ notify_write(vc, '\n');
}
static void ri(struct vc_data *vc)
@@ -1034,6 +1074,7 @@ static inline void cr(struct vc_data *vc)
{
vc->vc_pos -= vc->vc_x << 1;
vc->vc_need_wrap = vc->vc_x = 0;
+ notify_write(vc, '\r');
}
static inline void bs(struct vc_data *vc)
@@ -1042,6 +1083,7 @@ static inline void bs(struct vc_data *vc)
vc->vc_pos -= 2;
vc->vc_x--;
vc->vc_need_wrap = 0;
+ notify_write(vc, '\b');
}
}
@@ -1588,6 +1630,7 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
break;
}
vc->vc_pos += (vc->vc_x << 1);
+ notify_write(vc, '\t');
return;
case 10: case 11: case 12:
lf(vc);
@@ -2247,6 +2290,7 @@ rescan_last_byte:
tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
if (tc < 0) tc = ' ';
}
+ notify_write(vc, c);
if (inverse) {
FLUSH
@@ -2269,6 +2313,7 @@ rescan_last_byte:
release_console_sem();
out:
+ notify_update(vc);
return n;
#undef FLUSH
}
@@ -2312,6 +2357,7 @@ static void console_callback(struct work_struct *ignored)
do_blank_screen(0);
blank_timer_expired = 0;
}
+ notify_update(vc_cons[fg_console].d);
release_console_sem();
}
@@ -2413,6 +2459,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
continue;
}
scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
+ notify_write(vc, c);
cnt++;
if (myx == vc->vc_cols - 1) {
vc->vc_need_wrap = 1;
@@ -2431,6 +2478,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
}
}
set_cursor(vc);
+ notify_update(vc);
quit:
clear_bit(0, &printing);
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-07 09:47:04 +0000