Initial upstream commit
The history contained unlicensed code so everything got squashed, sorry.
Change-Id: Ie1335ecfcee7f740bb6de2e9887606be30a2deff
Signed-off-by: Nico Huber <nico.huber@secunet.com>
diff --git a/common/hw-time.adb b/common/hw-time.adb
new file mode 100644
index 0000000..3162de1
--- /dev/null
+++ b/common/hw-time.adb
@@ -0,0 +1,105 @@
+--
+-- Copyright (C) 2015-2016 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.
+--
+
+with HW;
+with HW.Time.Timer;
+
+use type HW.Word64;
+
+package body HW.Time
+ with Refined_State => (State => (Timer.Timer_State, Timer.Abstract_Time))
+is
+
+ function Now return T
+ with
+ Refined_Global => (Input => Timer.Abstract_Time)
+ is
+ Current : constant T := Timer.Raw_Value_Min;
+ begin
+ return Current;
+ end Now;
+
+ function US_From_Now (US : Natural) return T
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time, Timer.Timer_State))
+ is
+ Current : constant T := Timer.Raw_Value_Max;
+ begin
+ return Current + (T (US) * Timer.Hz + 999_999) / 1_000_000;
+ end US_From_Now;
+
+ function MS_From_Now (MS : Natural) return T
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time, Timer.Timer_State))
+ is
+ Current : constant T := Timer.Raw_Value_Max;
+ begin
+ return Current + (T (MS) * Timer.Hz + 999) / 1_000;
+ end MS_From_Now;
+
+ function Now_US return Int64
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time, Timer.Timer_State))
+ is
+ MHz : constant T := Timer.Hz / 1_000_000;
+ Current : constant T := Timer.Raw_Value_Min;
+ begin
+ return Int64 ((Current and (2 ** 63 - 1)) / (if MHz = 0 then 1 else MHz));
+ end Now_US;
+
+ ----------------------------------------------------------------------------
+
+ procedure Delay_Until (Deadline : T)
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time))
+ is
+ Current: T;
+ begin
+ loop
+ Current := Timer.Raw_Value_Min;
+ exit when Current >= Deadline;
+ end loop;
+ end Delay_Until;
+
+ procedure U_Delay (US : Natural)
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time, Timer.Timer_State))
+ is
+ Deadline : constant T := US_From_Now (US);
+ begin
+ Delay_Until (Deadline);
+ end U_Delay;
+
+ procedure M_Delay (MS : Natural)
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time, Timer.Timer_State))
+ is
+ Deadline : constant T := MS_From_Now (MS);
+ begin
+ Delay_Until (Deadline);
+ end M_Delay;
+
+ ----------------------------------------------------------------------------
+
+ function Timed_Out (Deadline : T) return Boolean
+ with
+ Refined_Global => (Input => (Timer.Abstract_Time))
+ is
+ Current : constant T := Timer.Raw_Value_Min;
+ begin
+ return Current >= Deadline;
+ end Timed_Out;
+
+end HW.Time;
+
+-- vim: set ts=8 sts=3 sw=3 et: