Add EFI_RUNTIME_SERVICES and EFI_TIME (#15)

It is now possible to get the current date and time with unsafe code using the GetTime function.

EFISharp.CoreLib/EFISharp.CoreLib.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net5.0</TargetFramework>
@@ -33,7 +33,9 @@
   </Target>
 
   <ItemGroup>
+    <Compile Include="EfiSharp\EFI_RUNTIME_SERVICES.cs" />
     <Compile Include="EfiSharp\EFI_BOOT_SERVICES.cs" />
+    <Compile Include="EfiSharp\EFI_TIME.cs" />
     <Compile Include="EfiSharp\EFI_GUID.cs" />
     <Compile Include="EfiSharp\EFI_EVENT.cs" />
     <Compile Include="EfiSharp\EFI_HANDLE.cs" />

EFISharp.CoreLib/EFISharp/EFI_RUNTIME_SERVICES.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace EfiSharp
+{
+    [StructLayout(LayoutKind.Sequential)]
+    public readonly unsafe struct EFI_RUNTIME_SERVICES
+    {
+        private readonly EFI_TABLE_HEADER Hdr;
+
+        // Time Services
+        private readonly delegate*<EFI_TIME*, void*, EFI_STATUS> _getTime;
+
+        //TODO Add EFI_TIME_CAPABILITIES and support EFI_RT_PROPERTIES_TABLE configuration table, then update the summary and returns to indicate that.
+        /// <summary>
+        /// <para>This function returns a time that was valid sometime during the call to the function.</para>
+        /// <para>This function should take approximately the same amount of time to read the time each time it is called.</para>
+        /// </summary>
+        /// <param name="time">Out variable to receive a snapshot of the current time.</param>
+        /// <returns>
+        /// <para><see cref="EFI_STATUS.EFI_SUCCESS"/> if the operation completed successfully.</para>
+        /// <para><see cref="EFI_STATUS.EFI_INVALID_PARAMETER"/> if <paramref name="time"/> is null.</para>
+        /// <para><see cref="EFI_STATUS.EFI_DEVICE_ERROR"/> if the time could not be retrieved due to a hardware error.</para>
+        /// <para><see cref="EFI_STATUS.EFI_UNSUPPORTED"/> if this call is not supported by this platform at the time the call is made.</para>
+        /// </returns>
+        public EFI_STATUS GetTime(out EFI_TIME time)
+        {
+            fixed (EFI_TIME* pTime = &time)
+            {
+                return _getTime(pTime, null);
+            }
+        }
+    }
+}

EFISharp.CoreLib/EFISharp/EFI_SYSTEM_TABLE.cs

@@ -15,7 +15,7 @@ public readonly unsafe struct EFI_SYSTEM_TABLE
         internal readonly EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL* ConOut;
         private readonly void* _pad2;
         private readonly void* _pad3;
-        private readonly void* _pad4;
+        public readonly EFI_RUNTIME_SERVICES* RuntimeServices;
         public readonly EFI_BOOT_SERVICES* BootServices;
     }
 }

EFISharp.CoreLib/EFISharp/EFI_TIME.cs

@@ -0,0 +1,18 @@
+using System.Runtime.InteropServices;
+
+namespace EfiSharp
+{
+
+    [StructLayout(LayoutKind.Sequential)]
+    public readonly struct EFI_TIME
+    {
+        public readonly ushort Year;
+        public readonly byte Month;
+        public readonly byte Day;
+        public readonly byte Hour;
+        public readonly byte Minute;
+        public readonly byte Second;
+        public readonly byte Pad1;
+        public readonly uint Nanosecond;
+    }
+}

EfiSharp/Class1.cs

@@ -90,6 +90,7 @@ public static void ConsoleTest()
         {
             ConsolePrimitiveTests();
             ConsoleFloatingPointTests();
+            ConsoleDateTimeTest();
             ConsoleInputTest();
             ConsoleInputExTest();
             ConsoleKeyTest();
@@ -243,6 +244,27 @@ private static void ConsoleFloatingPointTests()
             Console.WriteLine(-14141.000000000001d);
         }
 
+        private static unsafe void ConsoleDateTimeTest()
+        {
+            UefiApplication.SystemTable->RuntimeServices->GetTime(out EFI_TIME currentTime);
+            Console.WriteLine("Date and Time Test:");
+            Console.Write("Date: ");
+            //ISO 8601 format
+            Console.Write(currentTime.Year);
+            Console.Write(currentTime.Month < 10 ? "-0" : "-");
+            Console.Write(currentTime.Month);
+            Console.Write(currentTime.Day < 10 ? "-0" : "-");
+            Console.Write(currentTime.Day);
+
+            Console.Write(", Time: ");
+            if (currentTime.Hour < 10) Console.Write('0');
+            Console.Write(currentTime.Hour);
+            Console.Write(currentTime.Minute < 10 ? ":0" : ":");
+            Console.Write(currentTime.Minute);
+            Console.Write(currentTime.Second < 10 ? ":0" : ":");
+            Console.WriteLine(currentTime.Second);
+        }
+
         private static void ConsoleInputTest()
         {
             Console.Write("\r\nReadLine Input Test: ");