x86, setup: Store the boot cursor state

Add a field to store the boot cursor state and implement this for VGA on
x86. This can then be used to set the default policy for the boot console.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
LKML-Reference: <1258142222-16092-1-git-send-email-mjg@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 10 insertions, 1 deletions

diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c
index d42da3802499..f767164cd5df 100644
--- a/arch/x86/boot/video.c
+++ b/arch/x86/boot/video.c
@@ -27,6 +27,12 @@ static void store_cursor_position(void)
 
         boot_params.screen_info.orig_x = oreg.dl;
         boot_params.screen_info.orig_y = oreg.dh;
+
+        if (oreg.ch & 0x20)
+                boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
+
+        if ((oreg.ch & 0x1f) > (oreg.cl & 0x1f))
+                boot_params.screen_info.flags |= VIDEO_FLAGS_NOCURSOR;
 }
 
 static void store_video_mode(void)
diff --git a/include/linux/screen_info.h b/include/linux/screen_info.h
index 1ee2c05142f6..899fbb487c94 100644
--- a/include/linux/screen_info.h
+++ b/include/linux/screen_info.h
@@ -14,7 +14,8 @@ struct screen_info {
         __u16 orig_video_page;  /* 0x04 */
         __u8  orig_video_mode;  /* 0x06 */
         __u8  orig_video_cols;  /* 0x07 */
-        __u16 unused2;          /* 0x08 */
+        __u8  flags;            /* 0x08 */
+        __u8  unused2;          /* 0x09 */
         __u16 orig_video_ega_bx;/* 0x0a */
         __u16 unused3;          /* 0x0c */
         __u8  orig_video_lines; /* 0x0e */
@@ -65,6 +66,8 @@ struct screen_info {
 
 #define VIDEO_TYPE_EFI          0x70    /* EFI graphic mode             */
 
+#define VIDEO_FLAGS_NOCURSOR    (1 << 0) /* The video mode has no cursor set */
+
 #ifdef __KERNEL__
 extern struct screen_info screen_info;