Mega-patch for OpenFirmware loader support.

- Flesh out ofw_readin routine.
- Add OpenFirmware load and exec routines.
- Make sure memory allocation for the kernel is done correctly.
- Change the way the heap is allocated so as to make it easier to deallocate
  when we hand over.
- Add a command to print memory maps similar to the one for ia64.

With this patch, I can now load and hand over to a kernel on my iMac.  There
are some problems with OpenFirmware routines failing after the hand over that
still need to be addressed.

3 files changed, 18 insertions, 6 deletions

diff --git a/sys/boot/powerpc/ofw/Makefile b/sys/boot/powerpc/ofw/Makefile
index cd8ccaf..045f190 100644
--- a/sys/boot/powerpc/ofw/Makefile
+++ b/sys/boot/powerpc/ofw/Makefile
@@ -11,6 +11,10 @@ INSTALLFLAGS=	-b
 LOADER_DISK_SUPPORT?=	yes
 LOADER_NET_SUPPORT?=	yes
 
+# load address
+RELOC?=		0x6c0000
+CFLAGS+=	-DRELOC=${RELOC}
+
 # architecture-specific loader code
 SRCS=		conf.c
 
@@ -45,7 +49,7 @@ CFLAGS+=	-I${.CURDIR}/../../.. -I.
 CLEANFILES+=	vers.c vers.o ${BASE}.list ${BASE}.bin ${BASE}.sym ${BASE}.help
 
 CFLAGS+=	-Wall
-LDFLAGS=	-nostdlib -static -Ttext 6c0000
+LDFLAGS=	-nostdlib -static -Ttext ${RELOC}
 
 # OpenFirmware standalone support library
 LIBOFW=		${.OBJDIR}/../../ofw/libofw/libofw.a
diff --git a/sys/boot/powerpc/ofw/conf.c b/sys/boot/powerpc/ofw/conf.c
index 81ccbe7..273815a 100644
--- a/sys/boot/powerpc/ofw/conf.c
+++ b/sys/boot/powerpc/ofw/conf.c
@@ -27,7 +27,9 @@
  */
 
 #include <stand.h>
+#include "bootstrap.h"
 #include "libofw.h"
+#include "openfirm.h"
 
 #if defined(LOADER_NET_SUPPORT)
 #include "dev_net.h"
@@ -82,10 +84,9 @@ 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 powerpc_elf;
 
 struct file_format *file_formats[] = {
-/*  &powerpc_elf,*/
+    &ofw_elf,
     NULL
 };
 
@@ -101,3 +102,8 @@ struct console *consoles[] = {
     &ofwconsole,
     NULL
 };
+
+/*
+ * reloc - our load address
+ */
+vm_offset_t	reloc = RELOC;
diff --git a/sys/boot/powerpc/ofw/start.c b/sys/boot/powerpc/ofw/start.c
index a9aef2a..9f37ce0 100644
--- a/sys/boot/powerpc/ofw/start.c
+++ b/sys/boot/powerpc/ofw/start.c
@@ -37,8 +37,6 @@
 
 void startup(void *, int, int (*)(void *), char *, int);
 
-static int stack[8192/4 + 4];
-
 #ifdef XCOFF_GLUE
 asm("
 	.text
@@ -48,7 +46,11 @@ _entry:
 ");
 #endif
 
-asm("
+__asm("
+	.data
+stack:
+	.space	16388
+
 	.text
 	.globl	_start
 _start: