PPC32: Allow for hooks into the bootwrapper.

This allows for platform specific bi_recs to be passed in,
as well as other platform-specific fixups.

arch/ppc/boot/simple/misc-embedded.c

@@ -75,7 +75,7 @@ extern void gunzip(void *, int, unsigned char *, int *);
 extern void embed_config(bd_t **bp);
 
 unsigned long
-decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum, bd_t *bp)
+load_kernel(unsigned long load_addr, int num_words, unsigned long cksum, bd_t *bp)
 {
 	char *cp, ch;
 	int timer = 0, zimage_size;

arch/ppc/boot/simple/misc-spruce.c

@@ -147,7 +147,7 @@ unsigned long isa_io_base = SPRUCE_ISA_IO_BASE;
 #define MEM_B2EA	0x60
 
 unsigned long
-decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
+load_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
 {
 	int timer = 0;
 	char *cp, ch;

arch/ppc/boot/simple/misc.c

@@ -252,3 +252,10 @@ decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
 
 	return (struct bi_record *)rec_loc;
 }
+
+/* Allow decompress_kernel to be hooked into.  This is the default. */
+void * __attribute__ ((weak))
+load_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
+{
+		return decompress_kernel(load_addr, num_words, cksum);
+}

arch/ppc/boot/simple/relocate.S

@@ -183,7 +183,7 @@ start_ldr:
 	mr	r4,r7		/* Program length */
 	mr	r5,r6		/* Checksum */
 	mr	r6,r11		/* Residual data */
-	bl	decompress_kernel
+	bl	load_kernel
 
 	/*
 	 * Make sure the kernel knows we don't have things set in