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 */ 20 notrace unsigned long __init early_init(unsigned long dt_ptr) 21 { 22 unsigned long offset = reloc_offset(); 23 24 /* First zero the BSS */ 25 memset(PTRRELOC(&__bss_start), 0, __bss_stop - __bss_start); 26 27 /* 28 * Identify the CPU type and fix up code sections 29 * that depend on which cpu we have. 30 */ 31 identify_cpu(offset, mfspr(SPRN_PVR)); 32 33 apply_feature_fixups(); 34 35 return KERNELBASE + offset; 36 } 37