android_kernel_xiaomi_sm8350/arch/powerpc/kernel/early_32.c
Christophe Leroy 7934cea7f0 powerpc/32: use memset() instead of memset_io() to zero BSS
Since commit 400c47d81c ("powerpc32: memset: only use dcbz once cache is
enabled"), memset() can be used before activation of the cache,
so no need to use memset_io() for zeroing the BSS.

Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03 01:20:26 +10:00

37 lines
856 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>
#include <asm/asm-prototypes.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 offset = reloc_offset();
/* First zero the BSS */
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 KERNELBASE + offset;
}