arch/arm64/kernel/efi-stub.c

/*
 * Copyright (C) 2013, 2014 Linaro Ltd;  <roy.franz@linaro.org>
 *
 * This file implements the EFI boot stub for the arm64 kernel.
 * Adapted from ARM version by Mark Salter <msalter@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/efi.h>
#include <asm/efi.h>
#include <asm/sections.h>

efi_status_t handle_kernel_image(efi_system_table_t *sys_table,
				 unsigned long *image_addr,
				 unsigned long *image_size,
				 unsigned long *reserve_addr,
				 unsigned long *reserve_size,
				 unsigned long dram_base,
				 efi_loaded_image_t *image)
{
	efi_status_t status;
	unsigned long kernel_size, kernel_memsize = 0;

	/* Relocate the image, if required. */
	kernel_size = _edata - _text;
	if (*image_addr != (dram_base + TEXT_OFFSET)) {
		kernel_memsize = kernel_size + (_end - _edata);
		status = efi_relocate_kernel(sys_table, image_addr,
					     kernel_size, kernel_memsize,
					     dram_base + TEXT_OFFSET,
					     PAGE_SIZE);
		if (status != EFI_SUCCESS) {
			pr_efi_err(sys_table, "Failed to relocate kernel\n");
			return status;
		}
		if (*image_addr != (dram_base + TEXT_OFFSET)) {
			pr_efi_err(sys_table, "Failed to alloc kernel memory\n");
			efi_free(sys_table, kernel_memsize, *image_addr);
			return EFI_LOAD_ERROR;
		}
		*image_size = kernel_memsize;
	}


	return EFI_SUCCESS;
}