powerpc/ubldr: Teach powerpc's ubldr to boot 64-bit kernels

This is just a copy of powerpc/ofw's ppc64_elf_freebsd.c modified to fit
ubldr's boot format.

MFC after:	1 week

stand/powerpc/uboot/Makefile

@@ -16,7 +16,7 @@ NEWVERSWHAT=	"U-Boot loader" ${MACHINE_ARCH}
 INSTALLFLAGS=	-b
 
 # Architecture-specific loader code
-SRCS=		start.S conf.c vers.c
+SRCS=		start.S conf.c vers.c ppc64_elf_freebsd.c
 SRCS+=		ucmpdi2.c
 
 # Always add MI sources

stand/powerpc/uboot/conf.c

@@ -95,9 +95,11 @@ struct netif_driver *netif_drivers[] = {
  * Sort formats so that those that can detect based on arguments
  * rather than reading the file go first.
  */
+extern struct file_format uboot_elf64;
 
 struct file_format *file_formats[] = {
 	&uboot_elf,
+	&uboot_elf64,
 	NULL
 };
 

stand/powerpc/uboot/ppc64_elf_freebsd.c

@@ -0,0 +1,101 @@
+/*-
+ * Copyright (c) 2001 Benno Rice <benno@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#define __ELF_WORD_SIZE 64
+
+#include <sys/param.h>
+#include <sys/linker.h>
+
+#include <machine/metadata.h>
+#include <machine/elf.h>
+#include <machine/md_var.h>
+
+#include <stand.h>
+
+#include "bootstrap.h"
+#include "libuboot.h"
+
+vm_offset_t md_load64(char *args, vm_offset_t *modulep, vm_offset_t *dtb);
+extern char		end[];
+extern vm_offset_t	reloc;	/* From <arch>/conf.c */
+
+int
+ppc64_uboot_elf_loadfile(char *filename, uint64_t dest,
+    struct preloaded_file **result)
+{
+	int	r;
+
+	r = __elfN(loadfile)(filename, dest, result);
+	if (r != 0)
+		return (r);
+
+	/*
+	 * No need to sync the icache for modules: this will
+	 * be done by the kernel after relocation.
+	 */
+	if (!strcmp((*result)->f_type, "elf kernel"))
+		__syncicache((void *) (*result)->f_addr, (*result)->f_size);
+	return (0);
+}
+
+int
+ppc64_uboot_elf_exec(struct preloaded_file *fp)
+{
+	struct file_metadata	*fmp;
+	vm_offset_t		mdp, dtbp;
+	Elf_Ehdr		*e;
+	int			error;
+	void			(*entry)(void *);
+
+	if ((fmp = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) {
+		return(EFTYPE);
+	}
+	e = (Elf_Ehdr *)&fmp->md_data;
+	
+	/* Handle function descriptor for ELFv1 kernels */
+	if ((e->e_flags & 3) == 2)
+		entry = (void (*)(void*))(intptr_t)e->e_entry;
+	else
+		entry = *(void (*)(void*))(uint64_t *)(intptr_t)e->e_entry;
+
+	if ((error = md_load64(fp->f_args, &mdp, &dtbp)) != 0)
+		return (error);
+
+	dev_cleanup();
+	printf("Kernel args: %s\n", fp->f_args);
+
+	(*entry)((void *)mdp);
+	panic("exec returned");
+}
+
+struct file_format	uboot_elf64 =
+{
+	ppc64_uboot_elf_loadfile,
+	ppc64_uboot_elf_exec
+};