linux/arch/x86/kernel/kexec-bzimage64.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Kexec bzImage loader
 *
 * Copyright (C) 2014 Red Hat Inc.
 * Authors:
 *      Vivek Goyal <[email protected]>
 */

#define pr_fmt(fmt) …

#include <linux/string.h>
#include <linux/printk.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/kexec.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/efi.h>
#include <linux/random.h>

#include <asm/bootparam.h>
#include <asm/setup.h>
#include <asm/crash.h>
#include <asm/efi.h>
#include <asm/e820/api.h>
#include <asm/kexec-bzimage64.h>

#define MAX_ELFCOREHDR_STR_LEN …

/*
 * Defines lowest physical address for various segments. Not sure where
 * exactly these limits came from. Current bzimage64 loader in kexec-tools
 * uses these so I am retaining it. It can be changed over time as we gain
 * more insight.
 */
#define MIN_PURGATORY_ADDR …
#define MIN_BOOTPARAM_ADDR …
#define MIN_KERNEL_LOAD_ADDR …
#define MIN_INITRD_LOAD_ADDR …

/*
 * This is a place holder for all boot loader specific data structure which
 * gets allocated in one call but gets freed much later during cleanup
 * time. Right now there is only one field but it can grow as need be.
 */
struct bzimage64_data { … };

static int setup_initrd(struct boot_params *params,
		unsigned long initrd_load_addr, unsigned long initrd_len)
{ … }

static int setup_cmdline(struct kimage *image, struct boot_params *params,
			 unsigned long bootparams_load_addr,
			 unsigned long cmdline_offset, char *cmdline,
			 unsigned long cmdline_len)
{ … }

static int setup_e820_entries(struct boot_params *params)
{ … }

enum { … };

static void
setup_rng_seed(struct boot_params *params, unsigned long params_load_addr,
	       unsigned int rng_seed_setup_data_offset)
{ … }

#ifdef CONFIG_EFI
static int setup_efi_info_memmap(struct boot_params *params,
				  unsigned long params_load_addr,
				  unsigned int efi_map_offset,
				  unsigned int efi_map_sz)
{ … }

static int
prepare_add_efi_setup_data(struct boot_params *params,
		       unsigned long params_load_addr,
		       unsigned int efi_setup_data_offset)
{ … }

static int
setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
		unsigned int efi_map_offset, unsigned int efi_map_sz,
		unsigned int efi_setup_data_offset)
{ … }
#endif /* CONFIG_EFI */

static void
setup_ima_state(const struct kimage *image, struct boot_params *params,
		unsigned long params_load_addr,
		unsigned int ima_setup_data_offset)
{ … }

static int
setup_boot_parameters(struct kimage *image, struct boot_params *params,
		      unsigned long params_load_addr,
		      unsigned int efi_map_offset, unsigned int efi_map_sz,
		      unsigned int setup_data_offset)
{ … }

static int bzImage64_probe(const char *buf, unsigned long len)
{ … }

static void *bzImage64_load(struct kimage *image, char *kernel,
			    unsigned long kernel_len, char *initrd,
			    unsigned long initrd_len, char *cmdline,
			    unsigned long cmdline_len)
{ … }

/* This cleanup function is called after various segments have been loaded */
static int bzImage64_cleanup(void *loader_data)
{ … }

const struct kexec_file_ops kexec_bzImage64_ops = …;