Import Tristan Gingold's ia64 port

(based on patch sent to grub-devel by Tristan in 2008-01-28)

kern/ia64/efi/startup.S

@@ -0,0 +1,40 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2008  Free Software Foundation, Inc.
+ *
+ *  GRUB 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, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+	.text
+	.psr abi64
+	.psr lsb
+	.lsb
+
+	.global _start
+	.proc _start
+_start:
+	alloc loc0=ar.pfs,2,4,0,0
+	mov loc1=rp
+	addl loc2=@gprel(grub_efi_image_handle),gp
+	addl loc3=@gprel(grub_efi_system_table),gp
+	;;
+	st8 [loc2]=in0
+	st8 [loc3]=in1
+	br.call.sptk.few rp=grub_main
+	;;
+	mov ar.pfs=loc0
+	mov rp=loc1
+	;;
+	br.ret.sptk.few rp
+
+	.endp _start