Kernel/Graphics: Introduce the DisplayConnector class

The DisplayConnector class is meant to replace the FramebufferDevice
class. The advantage of this class over the FramebufferDevice class is:
1. It removes the mmap interface entirely. This interface is unsafe, as
multiple processes could try to use it, and when switching to and from
text console mode, there's no "good" way to revoke a memory mapping from
this interface, let alone when there are multiple processes that call
this interface. Therefore, in the DisplayConnector class there's no
implementation for this method at all.
2. The class uses a new real-world structure called ModeSetting, which
takes into account the fact that real hardware requires more than width,
height and pitch settings to mode-set the display resolution.
3. The class assumes all instances should supply some sort of EDID,
so it facilitates such mechanism to do so. Even if a given driver does
not know what is the actual EDID, it will ask to create default-generic
EDID blob.
3. This class shifts the responsibilies of switching between console
mode and graphical mode from a GraphicsAdapter to the DisplayConnector
class, so when doing the switch, the GraphicsManagement code actually
asks each DisplayConnector object to do the switch and doesn't rely on
the GraphicsAdapter objects at all.

1 files changed, 19 insertions, 0 deletions

diff --git a/Userland/Libraries/LibC/sys/ioctl_numbers.h b/Userland/Libraries/LibC/sys/ioctl_numbers.h
index a1a314e378..95e8b74742 100644
--- a/Userland/Libraries/LibC/sys/ioctl_numbers.h
+++ b/Userland/Libraries/LibC/sys/ioctl_numbers.h
@@ -23,6 +23,7 @@ struct FBProperties {
     unsigned char doublebuffer_support;
     unsigned char flushing_support;
     unsigned char partial_flushing_support;
+    unsigned char refresh_rate_support;
 };
 
 struct FBHeadProperties {
@@ -36,6 +37,21 @@ struct FBHeadProperties {
     unsigned buffer_length;
 };
 
+struct FBHeadModeSetting {
+    int horizontal_stride;
+    int pixel_clock_in_khz;
+    int horizontal_active;
+    int horizontal_front_porch_pixels;
+    int horizontal_sync_time_pixels;
+    int horizontal_blank_pixels;
+    int vertical_active;
+    int vertical_front_porch_lines;
+    int vertical_sync_time_lines;
+    int vertical_blank_lines;
+    int horizontal_offset;
+    int vertical_offset;
+};
+
 struct FBHeadResolution {
     int head_index;
     int pitch;
@@ -103,6 +119,9 @@ enum IOCtlNumber {
     FB_IOCTL_GET_HEAD_VERTICAL_OFFSET_BUFFER,
     FB_IOCTL_FLUSH_HEAD_BUFFERS,
     FB_IOCTL_FLUSH_HEAD,
+    FB_IOCTL_SET_HEAD_MODE_SETTING,
+    FB_IOCTL_GET_HEAD_MODE_SETTING,
+    FB_IOCTL_SET_SAFE_HEAD_MODE_SETTING,
     KEYBOARD_IOCTL_GET_NUM_LOCK,
     KEYBOARD_IOCTL_SET_NUM_LOCK,
     KEYBOARD_IOCTL_GET_CAPS_LOCK,