ArmVirtualizationPkg: add a relocatable version of PrePi

This patch introduces a relocatable PrePi, which can execute
from arbitrary offsets in RAM. This is intendend to be run
from a boot loader which passes a description of the actual
platform in a device tree, for instance.

This module is based on the PrePi implementations residing under
ArmPlatformPkg.

Contributed-under: TianoCore Contribution Agreement 1.0
Reviewed-by: Olivier Martin <olivier.martin@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16961 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/ArmVirtualizationPkg/PrePi/Scripts/PrePi-PIE.lds

@@ -0,0 +1,42 @@
+#/** @file
+#
+#  Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution.  The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#**/
+
+SECTIONS
+{
+  .text 0x0 : {
+    PROVIDE(__reloc_base = .);
+
+    *(.text .text*)
+    *(.got .got*)
+    *(.rodata .rodata*)
+    *(.data .data*)
+
+    . = ALIGN(0x20);
+    PROVIDE(__reloc_start = .);
+    *(.rela .rela*)
+    PROVIDE(__reloc_end = .);
+  }
+  .bss ALIGN(0x20) : { *(.bss .bss*) }
+
+  /DISCARD/ : {
+    *(.note.GNU-stack)
+    *(.gnu_debuglink)
+    *(.interp)
+    *(.dynamic)
+    *(.dynsym)
+    *(.dynstr)
+    *(.hash)
+    *(.comment)
+  }
+}