Initial upstream commit
The history contained unlicensed code so everything got squashed, sorry.
Change-Id: I9f5775208f9df6fb29074bf3bc498f68cb17b3a0
Signed-off-by: Nico Huber <nico.huber@secunet.com>
diff --git a/common/hw-gfx-edid.ads b/common/hw-gfx-edid.ads
new file mode 100644
index 0000000..28dc2db
--- /dev/null
+++ b/common/hw-gfx-edid.ads
@@ -0,0 +1,79 @@
+--
+-- Copyright (C) 2016 secunet Security Networks AG
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; version 2 of the License.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+
+package HW.GFX.EDID
+is
+
+ use type Word8;
+ use type Word16;
+
+ subtype Raw_EDID_Index is Natural range 0 .. 127;
+ subtype Raw_EDID_Data is Buffer (Raw_EDID_Index);
+
+ function Valid (Raw_EDID : Raw_EDID_Data) return Boolean;
+
+ DESCRIPTOR_1 : constant := 54;
+
+ function Read_LE16
+ (Raw_EDID : Raw_EDID_Data;
+ Offset : Raw_EDID_Index)
+ return Word16
+ with
+ Pre => Offset < Raw_EDID_Index'Last;
+
+ function Has_Preferred_Mode (Raw_EDID : Raw_EDID_Data) return Boolean
+ with
+ Pre => Valid (Raw_EDID),
+ Post =>
+ (Has_Preferred_Mode'Result =
+ (Int64 (Read_LE16 (Raw_EDID, DESCRIPTOR_1)) * 10_000
+ in Frequency_Type and
+ ( Raw_EDID (DESCRIPTOR_1 + 2) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 4) and 16#f0#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 8) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#c0#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 9) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#30#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 3) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 4) and 16#0f#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 5) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 7) and 16#f0#) /= 0) and
+ ((Raw_EDID (DESCRIPTOR_1 + 10) and 16#f0#) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#0c#) /= 0) and
+ ((Raw_EDID (DESCRIPTOR_1 + 10) and 16#0f#) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#03#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 6) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 7) and 16#0f#) /= 0)));
+ function Preferred_Mode (Raw_EDID : Raw_EDID_Data) return Mode_Type
+ with
+ Pre =>
+ Int64 (Read_LE16 (Raw_EDID, DESCRIPTOR_1)) * 10_000
+ in Frequency_Type and
+ ( Raw_EDID (DESCRIPTOR_1 + 2) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 4) and 16#f0#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 8) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#c0#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 9) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#30#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 3) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 4) and 16#0f#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 5) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 7) and 16#f0#) /= 0) and
+ ((Raw_EDID (DESCRIPTOR_1 + 10) and 16#f0#) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#0c#) /= 0) and
+ ((Raw_EDID (DESCRIPTOR_1 + 10) and 16#0f#) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 11) and 16#03#) /= 0) and
+ ( Raw_EDID (DESCRIPTOR_1 + 6) /= 0 or
+ (Raw_EDID (DESCRIPTOR_1 + 7) and 16#0f#) /= 0);
+
+end HW.GFX.EDID;