1 | // SPDX-License-Identifier: GPL-2.0 |
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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 |