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>

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)

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;