Add trampoline support and move assembler prototypes

xtoskrnl/ar/amd64/boot.S

@@ -131,3 +131,17 @@ XpaTemporaryGdtDesc: .quad 0x0000000000000000, 0x00CF9A000000FFFF, 0x00AF9A00000
 
 .global ArEnableExtendedPhysicalAddressingEnd
 ArEnableExtendedPhysicalAddressingEnd:
+
+
+/**
+ * Starts an application processor (AP). This is just a stub.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+.global ArStartApplicationProcessor
+ArStartApplicationProcessor:
+
+.global ArStartApplicationProcessorEnd
+ArStartApplicationProcessorEnd:

xtoskrnl/ar/amd64/procsup.cc

@@ -23,6 +23,31 @@ AR::ProcSup::GetBootStack(VOID)
     return (PVOID)BootStack;
 }
 
+XTAPI
+VOID
+AR::ProcSup::GetTrampolineInformation(IN TRAMPOLINE_TYPE TrampolineType,
+                                      OUT PVOID *TrampolineCode,
+                                      OUT PULONG_PTR TrampolineSize)
+{
+    switch(TrampolineType)
+    {
+        case TrampolineApStartup:
+            *TrampolineCode = (PVOID)ArStartApplicationProcessor;
+            *TrampolineSize = (ULONG_PTR)ArStartApplicationProcessorEnd -
+                              (ULONG_PTR)ArStartApplicationProcessor;
+            break;
+        case TrampolineEnableXpa:
+            *TrampolineCode = (PVOID)ArEnableExtendedPhysicalAddressing;
+            *TrampolineSize = (ULONG_PTR)ArEnableExtendedPhysicalAddressingEnd -
+                              (ULONG_PTR)ArEnableExtendedPhysicalAddressing;
+            break;
+        default:
+            *TrampolineCode = NULLPTR;
+            *TrampolineSize = 0;
+            break;
+    }
+}
+
 /**
  * Identifies processor type (vendor, model, stepping) as well as looks for available CPU features and stores them
  * in Processor Control Block (PRCB).