39 lines
888 B
C
39 lines
888 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
* Early init before relocation
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/sections.h>
|
|
|
|
/*
|
|
* We're called here very early in the boot.
|
|
*
|
|
* Note that the kernel may be running at an address which is different
|
|
* from the address that it was linked at, so we must use RELOC/PTRRELOC
|
|
* to access static data (including strings). -- paulus
|
|
*/
|
|
notrace unsigned long __init early_init(unsigned long dt_ptr)
|
|
{
|
|
unsigned long kva, offset = reloc_offset();
|
|
|
|
kva = *PTRRELOC(&kernstart_virt_addr);
|
|
|
|
/* First zero the BSS */
|
|
if (kva == KERNELBASE)
|
|
memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start);
|
|
|
|
/*
|
|
* Identify the CPU type and fix up code sections
|
|
* that depend on which cpu we have.
|
|
*/
|
|
identify_cpu(offset, mfspr(SPRN_PVR));
|
|
|
|
apply_feature_fixups();
|
|
|
|
return kva + offset;
|
|
}
|