[POWERPC] zImage: Cleanup and improve prep_kernel()
This patch rewrites prep_kernel() in the zImage wrapper code to be
clearer and more flexible. Notable changes:
- Handling of the initrd image from prep_kernel() has moved
into a new prep_initrd() function.
- The address of the initrd image is now added as device tree
properties, as the kernel expects.
- We only copy a packaged initrd image to a new location if it
is in danger of being clobbered when the kernel moves to its final
location, instead of always.
- By default we decompress the kernel directly to address 0,
instead of requiring it to relocate itself. Platforms (such as OF)
where doing this could clobber still-live firmware data structures can
override the vmlinux_alloc hook to provide an alternate place to
decompress the kernel.
- We no longer pass lots of information between functions in
global variables.
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/boot/of.c b/arch/powerpc/boot/of.c
index 0182f38..044f347 100644
--- a/arch/powerpc/boot/of.c
+++ b/arch/powerpc/boot/of.c
@@ -208,6 +208,17 @@
}
}
+static void *of_vmlinux_alloc(unsigned long size)
+{
+ void *p = malloc(size);
+
+ if (!p) {
+ printf("Can't allocate memory for kernel image!\n\r");
+ exit();
+ }
+ return p;
+}
+
static void of_exit(void)
{
call_prom("exit", 0, 0);
@@ -261,6 +272,7 @@
platform_ops.image_hdr = of_image_hdr;
platform_ops.malloc = of_try_claim;
platform_ops.exit = of_exit;
+ platform_ops.vmlinux_alloc = of_vmlinux_alloc;
dt_ops.finddevice = of_finddevice;
dt_ops.getprop = of_getprop;