vc: Add support for hiding the cursor when creating VTs

Add support for setting a global default for whether or not a visible
cursor should be enabled when creating VCs. The default will be to do so,
unless overridden by the user at boot time or by a driver.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
LKML-Reference: <1258143251-5818-1-git-send-email-mjg@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9107b38..dd42eb6 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2729,6 +2729,15 @@ and is between 256 and 4096 characters. It is defined in the file
                        Default is 1, i.e. UTF-8 mode is enabled for all
                        newly opened terminals.
 
+       vt.global_cursor_default=
+                       [VT]
+                       Format=<-1|0|1>
+                       Set system-wide default for whether a cursor
+                       is shown on new VTs. Default is -1,
+                       i.e. cursors will be created by default unless
+                       overridden by individual drivers. 0 will hide
+                       cursors, 1 will display them.
+
        waveartist=     [HW,OSS]
                        Format: <io>,<irq>,<dma>,<dma2>
 

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 0c80c68..1e3d728 100644 (file)
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -161,6 +161,8 @@ static void set_palette(struct vc_data *vc);
 static int printable;          /* Is console ready for printing? */
 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);
 
 /*
  * ignore_poke: don't unblank the screen when things are typed.  This is
@@ -775,6 +777,12 @@ int vc_allocate(unsigned int currcons)     /* return 0 on success */
                vc_cons[currcons].d = NULL;
                return -ENOMEM;
            }
+
+           /* 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);
@@ -1616,7 +1624,7 @@ static void reset_terminal(struct vc_data *vc, int do_clear)
        vc->vc_decscnm          = 0;
        vc->vc_decom            = 0;
        vc->vc_decawm           = 1;
-       vc->vc_deccm            = 1;
+       vc->vc_deccm            = global_cursor_default;
        vc->vc_decim            = 0;
 
        set_kbd(vc, decarm);
@@ -4078,6 +4086,7 @@ 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(take_over_console);
 EXPORT_SYMBOL(give_up_console);

diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
index da55cca..564643e 100644 (file)
--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -585,6 +585,8 @@ static void vgacon_init(struct vc_data *c, int init)
        vgacon_uni_pagedir[1]++;
        if (!vgacon_uni_pagedir[0] && p)
                con_set_default_unimap(c);
+
+       hide_boot_cursor(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
 }
 
 static void vgacon_deinit(struct vc_data *c)

diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index c0c4e11..7f56db4 100644 (file)
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -110,6 +110,7 @@ extern char con_buf[CON_BUF_SIZE];
 extern struct mutex con_buf_mtx;
 extern char vt_dont_switch;
 extern int default_utf8;
+extern int global_cursor_default;
 
 struct vt_spawn_console {
        spinlock_t lock;
@@ -130,4 +131,6 @@ struct vt_notifier_param {
 extern int register_vt_notifier(struct notifier_block *nb);
 extern int unregister_vt_notifier(struct notifier_block *nb);
 
+extern void hide_boot_cursor(bool hide);
+
 #endif /* _VT_KERN_H */