LXR uboot/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#include <asm/zimage.h>
  31
  32#ifdef CONFIG_SYS_DEBUG
  33static void hexdump(unsigned char *buf, int len)
  34{
  35        int i;
  36
  37        for (i = 0; i < len; i++) {
  38                if ((i % 16) == 0)
  39                        printf("%s%08x: ", i ? "\n" : "",
  40                                                        (unsigned int)&buf[i]);
  41                printf("%02x ", buf[i]);
  42        }
  43        printf("\n");
  44}
  45#endif
  46
  47#ifdef CONFIG_SH_SDRAM_OFFSET
  48#define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
  49#else
  50#define GET_INITRD_START(initrd, linux) (initrd - linux)
  51#endif
  52
  53static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
  54{
  55        *(unsigned long *)(param_addr) = data;
  56}
  57
  58static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
  59{
  60        unsigned long val = 0;
  61        char *p = strstr(cmdline, key);
  62        if (p) {
  63                p += strlen(key);
  64                val = simple_strtol(p, NULL, base);
  65        }
  66        return val;
  67}
  68
  69int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
  70{
  71        /* Linux kernel load address */
  72        void (*kernel) (void) = (void (*)(void))images->ep;
  73        /* empty_zero_page */
  74        unsigned char *param
  75                = (unsigned char *)image_get_load(images->legacy_hdr_os);
  76        /* Linux kernel command line */
  77        char *cmdline = (char *)param + COMMAND_LINE;
  78        /* PAGE_SIZE */
  79        unsigned long size = images->ep - (unsigned long)param;
  80        char *bootargs = getenv("bootargs");
  81
  82        /*
  83         * allow the PREP bootm subcommand, it is required for bootm to work
  84         */
  85        if (flag & BOOTM_STATE_OS_PREP)
  86                return 0;
  87
  88        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  89                return 1;
  90
  91        /* Clear zero page */
  92        memset(param, 0, size);
  93
  94        /* Set commandline */
  95        strcpy(cmdline, bootargs);
  96
  97        /* Initrd */
  98        if (images->rd_start || images->rd_end) {
  99                unsigned long ramdisk_flags = 0;
 100                int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
 101                if (val == 1)
 102                                ramdisk_flags |= RD_PROMPT;
 103                else
 104                                ramdisk_flags &= ~RD_PROMPT;
 105
 106                val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
 107                if (val == 1)
 108                                ramdisk_flags |= RD_DOLOAD;
 109                else
 110                                ramdisk_flags &= ~RD_DOLOAD;
 111
 112                set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
 113                set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
 114                set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
 115                set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
 116                set_sh_linux_param((unsigned long)param + INITRD_START,
 117                        GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
 118                set_sh_linux_param((unsigned long)param + INITRD_SIZE,
 119                        images->rd_end - images->rd_start);
 120        }
 121
 122        /* Boot kernel */
 123        kernel();
 124
 125        /* does not return */
 126        return 1;
 127}
 128