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 */ 19 notrace 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