[PATCH 1/3] setup: Store the boot cursor state

Matthew Garrett
2009-11-13T19:58:00Z

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>
---
arch/x86/boot/video.c | 6 ++++++
include/linux/screen_info.h | 5 ++++-
2 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c
index d42da38..f767164 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 1ee2c05..899fbb4 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;

--
1.6.5.2