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
12/*
13 * We're called here very early in the boot.
14 *
15 * Note that the kernel may be running at an address which is different
16 * from the address that it was linked at, so we must use RELOC/PTRRELOC
17 * to access static data (including strings).  -- paulus
18 */
19notrace unsigned long __init early_init(unsigned long dt_ptr)
20{
21	unsigned long kva, offset = reloc_offset();
22
23	kva = *PTRRELOC(&kernstart_virt_addr);
24
25	/* First zero the BSS */
26	if (kva == KERNELBASE)
27		memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
28
29	/*
30	 * Identify the CPU type and fix up code sections
31	 * that depend on which cpu we have.
32	 */
33	identify_cpu(offset, mfspr(SPRN_PVR));
34
35	apply_feature_fixups();
36
37	return kva + offset;
38}
39