arch/sh/lib/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (c) Copyright 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
   6  * (c) Copyright 2008 Renesas Solutions Corp.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  *
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <asm/byteorder.h>
  30
  31 #ifdef CONFIG_SYS_DEBUG
  32 static void hexdump(unsigned char *buf, int len)
  33 {
  34         int i;
  35
  36         for (i = 0; i < len; i++) {
  37                 if ((i % 16) == 0)
  38                         printf("%s%08x: ", i ? "\n" : "",
  39                                                         (unsigned int)&buf[i]);
  40                 printf("%02x ", buf[i]);
  41         }
  42         printf("\n");
  43 }
  44 #endif
  45
  46 #define MOUNT_ROOT_RDONLY       0x000
  47 #define RAMDISK_FLAGS           0x004
  48 #define ORIG_ROOT_DEV           0x008
  49 #define LOADER_TYPE                     0x00c
  50 #define INITRD_START            0x010
  51 #define INITRD_SIZE                     0x014
  52 #define COMMAND_LINE            0x100
  53
  54 #define RD_PROMPT       (1<<15)
  55 #define RD_DOLOAD       (1<<14)
  56 #define CMD_ARG_RD_PROMPT       "prompt_ramdisk="
  57 #define CMD_ARG_RD_DOLOAD       "load_ramdisk="
  58
  59 #ifdef CONFIG_SH_SDRAM_OFFSET
  60 #define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
  61 #else
  62 #define GET_INITRD_START(initrd, linux) (initrd - linux)
  63 #endif
  64
  65 static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
  66 {
  67         *(unsigned long *)(param_addr) = data;
  68 }
  69
  70 static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
  71 {
  72         unsigned long val = 0;
  73         char *p = strstr(cmdline, key);
  74         if (p) {
  75                 p += strlen(key);
  76                 val = simple_strtol(p, NULL, base);
  77         }
  78         return val;
  79 }
  80
  81 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  82 {
  83         /* Linux kernel load address */
  84         void (*kernel) (void) = (void (*)(void))images->ep;
  85         /* empty_zero_page */
  86         unsigned char *param
  87                 = (unsigned char *)image_get_load(images->legacy_hdr_os);
  88         /* Linux kernel command line */
  89         char *cmdline = (char *)param + COMMAND_LINE;
  90         /* PAGE_SIZE */
  91         unsigned long size = images->ep - (unsigned long)param;
  92         char *bootargs = getenv("bootargs");
  93
  94         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  95                 return 1;
  96
  97         /* Setup parameters */
  98         memset(param, 0, size); /* Clear zero page */
  99
 100         /* Set commandline */
 101         strcpy(cmdline, bootargs);
 102
 103         sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
 104         /* Initrd */
 105         if (images->rd_start || images->rd_end) {
 106                 unsigned long ramdisk_flags = 0;
 107                 int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
 108                 if (val == 1)
 109                                 ramdisk_flags |= RD_PROMPT;
 110                 else
 111                                 ramdisk_flags &= ~RD_PROMPT;
 112
 113                 val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
 114                 if (val == 1)
 115                                 ramdisk_flags |= RD_DOLOAD;
 116                 else
 117                                 ramdisk_flags &= ~RD_DOLOAD;
 118
 119                 set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
 120                 set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
 121                 set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
 122                 set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
 123                 set_sh_linux_param((unsigned long)param + INITRD_START,
 124                         GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
 125                 set_sh_linux_param((unsigned long)param + INITRD_SIZE,
 126                         images->rd_end - images->rd_start);
 127         }
 128
 129         /* Boot kernel */
 130         kernel();
 131         /* does not return */
 132
 133         return 1;
 134 }