arch/mips/boot/compressed/calc_vmlinuz_load_addr.c

   1 /*
   2  * Copyright (C) 2010 "Wu Zhangjin" <wuzhangjin@gmail.com>
   3  *
   4  * This program is free software; you can redistribute  it and/or modify it
   5  * under  the terms of  the GNU General  Public License as published by the
   6  * Free Software Foundation;  either version 2 of the  License, or (at your
   7  * option) any later version.
   8  */
   9
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <errno.h>
  13 #include <stdint.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include "../../../../include/linux/sizes.h"
  17
  18 int main(int argc, char *argv[])
  19 {
  20         unsigned long long vmlinux_size, vmlinux_load_addr, vmlinuz_load_addr;
  21         struct stat sb;
  22
  23         if (argc != 3) {
  24                 fprintf(stderr, "Usage: %s <pathname> <vmlinux_load_addr>\n",
  25                                 argv[0]);
  26                 return EXIT_FAILURE;
  27         }
  28
  29         if (stat(argv[1], &sb) == -1) {
  30                 perror("stat");
  31                 return EXIT_FAILURE;
  32         }
  33
  34         /* Convert hex characters to dec number */
  35         errno = 0;
  36         if (sscanf(argv[2], "%llx", &vmlinux_load_addr) != 1) {
  37                 if (errno != 0)
  38                         perror("sscanf");
  39                 else
  40                         fprintf(stderr, "No matching characters\n");
  41
  42                 return EXIT_FAILURE;
  43         }
  44
  45         vmlinux_size = (uint64_t)sb.st_size;
  46         vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;
  47
  48         /*
  49          * Align with 64KB: KEXEC needs load sections to be aligned to PAGE_SIZE,
  50          * which may be as large as 64KB depending on the kernel configuration.
  51          */
  52
  53         vmlinuz_load_addr += (SZ_64K - vmlinux_size % SZ_64K);
  54
  55         printf("0x%llx\n", vmlinuz_load_addr);
  56
  57         return EXIT_SUCCESS;
  58 }