1// SPDX-License-Identifier: GPL-2.0
 2
 3/*
 4 * Early init before relocation
 5 */
 6
 7#include <linux/init.h>
 8#include <linux/kernel.h>
 9#include <asm/setup.h>
10#include <asm/sections.h>
11#include <asm/asm-prototypes.h>
12
13/*
14 * We're called here very early in the boot.
15 *
16 * Note that the kernel may be running at an address which is different
17 * from the address that it was linked at, so we must use RELOC/PTRRELOC
18 * to access static data (including strings).  -- paulus
19 */
20notrace unsigned long __init early_init(unsigned long dt_ptr)
21{
22	unsigned long kva, offset = reloc_offset();
23
24	kva = *PTRRELOC(&kernstart_virt_addr);
25
26	/* First zero the BSS */
27	if (kva == KERNELBASE)
28		memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
29
30	/*
31	 * Identify the CPU type and fix up code sections
32	 * that depend on which cpu we have.
33	 */
34	identify_cpu(offset, mfspr(SPRN_PVR));
35
36	apply_feature_fixups();
37
38	return kva + offset;
39}