LXR linux/arch/parisc/kernel/kexec

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Load ELF vmlinux file for the kexec_file_load syscall.
   4 *
   5 * Copyright (c) 2019 Sven Schnelle <svens@stackframe.org>
   6 *
   7 */
   8#include <linux/elf.h>
   9#include <linux/kexec.h>
  10#include <linux/libfdt.h>
  11#include <linux/module.h>
  12#include <linux/of_fdt.h>
  13#include <linux/slab.h>
  14#include <linux/types.h>
  15
  16static void *elf_load(struct kimage *image, char *kernel_buf,
  17                        unsigned long kernel_len, char *initrd,
  18                        unsigned long initrd_len, char *cmdline,
  19                        unsigned long cmdline_len)
  20{
  21        int ret, i;
  22        unsigned long kernel_load_addr;
  23        struct elfhdr ehdr;
  24        struct kexec_elf_info elf_info;
  25        struct kexec_buf kbuf = { .image = image, .buf_min = 0,
  26                                  .buf_max = -1UL, };
  27
  28        ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
  29        if (ret)
  30                goto out;
  31
  32        ret = kexec_elf_load(image, &ehdr, &elf_info, &kbuf, &kernel_load_addr);
  33        if (ret)
  34                goto out;
  35
  36        image->start = __pa(elf_info.ehdr->e_entry);
  37
  38        for (i = 0; i < image->nr_segments; i++)
  39                image->segment[i].mem = __pa(image->segment[i].mem);
  40
  41        pr_debug("Loaded the kernel at 0x%lx, entry at 0x%lx\n",
  42                 kernel_load_addr, image->start);
  43
  44        if (initrd != NULL) {
  45                kbuf.buffer = initrd;
  46                kbuf.bufsz = kbuf.memsz = initrd_len;
  47                kbuf.buf_align = PAGE_SIZE;
  48                kbuf.top_down = false;
  49                kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
  50                ret = kexec_add_buffer(&kbuf);
  51                if (ret)
  52                        goto out;
  53
  54                pr_debug("Loaded initrd at 0x%lx\n", kbuf.mem);
  55                image->arch.initrd_start = kbuf.mem;
  56                image->arch.initrd_end = kbuf.mem + initrd_len;
  57        }
  58
  59        if (cmdline != NULL) {
  60                kbuf.buffer = cmdline;
  61                kbuf.bufsz = kbuf.memsz = ALIGN(cmdline_len, 8);
  62                kbuf.buf_align = PAGE_SIZE;
  63                kbuf.top_down = false;
  64                kbuf.buf_min = PAGE0->mem_free + PAGE_SIZE;
  65                kbuf.buf_max = kernel_load_addr;
  66                kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
  67                ret = kexec_add_buffer(&kbuf);
  68                if (ret)
  69                        goto out;
  70
  71                pr_debug("Loaded cmdline at 0x%lx\n", kbuf.mem);
  72                image->arch.cmdline = kbuf.mem;
  73        }
  74out:
  75        return NULL;
  76}
  77
  78const struct kexec_file_ops kexec_elf_ops = {
  79        .probe = kexec_elf_probe,
  80        .load = elf_load,
  81};
  82
  83const struct kexec_file_ops * const kexec_file_loaders[] = {
  84        &kexec_elf_ops,
  85        NULL
  86};
  87