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Diffstat (limited to '')
-rw-r--r-- | arch/powerpc/kernel/early_32.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/early_32.c b/arch/powerpc/kernel/early_32.c new file mode 100644 index 000000000..ef2ad4945 --- /dev/null +++ b/arch/powerpc/kernel/early_32.c @@ -0,0 +1,39 @@ +// 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 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; +} |