arch/mips/lib/bootm.c

   1 /*
   2  * (C) Copyright 2003
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <image.h>
  27 #include <u-boot/zlib.h>
  28 #include <asm/byteorder.h>
  29 #include <asm/addrspace.h>
  30
  31 DECLARE_GLOBAL_DATA_PTR;
  32
  33 #define LINUX_MAX_ENVS          256
  34 #define LINUX_MAX_ARGS          256
  35
  36 static int linux_argc;
  37 static char **linux_argv;
  38
  39 static char **linux_env;
  40 static char *linux_env_p;
  41 static int linux_env_idx;
  42
  43 static void linux_params_init(ulong start, char *commandline);
  44 static void linux_env_set(char *env_name, char *env_val);
  45
  46 static void boot_jump_linux(bootm_headers_t *images)
  47 {
  48         void (*theKernel) (int, char **, char **, int *);
  49
  50         /* find kernel entry point */
  51         theKernel = (void (*)(int, char **, char **, int *))images->ep;
  52
  53         debug("## Transferring control to Linux (at address %08lx) ...\n",
  54                 (ulong) theKernel);
  55
  56         bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  57
  58         /* we assume that the kernel is in place */
  59         printf("\nStarting kernel ...\n\n");
  60
  61         theKernel(linux_argc, linux_argv, linux_env, 0);
  62 }
  63
  64 int do_bootm_linux(int flag, int argc, char * const argv[],
  65                         bootm_headers_t *images)
  66 {
  67         char *commandline = getenv("bootargs");
  68         char env_buf[12];
  69         char *cp;
  70
  71         if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  72                 return 1;
  73
  74         linux_params_init(UNCACHED_SDRAM(gd->bd->bi_boot_params), commandline);
  75
  76 #ifdef CONFIG_MEMSIZE_IN_BYTES
  77         sprintf(env_buf, "%lu", (ulong)gd->ram_size);
  78         debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
  79 #else
  80         sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
  81         debug("## Giving linux memsize in MB, %lu\n",
  82                 (ulong)(gd->ram_size >> 20));
  83 #endif /* CONFIG_MEMSIZE_IN_BYTES */
  84
  85         linux_env_set("memsize", env_buf);
  86
  87         sprintf(env_buf, "0x%08X", (uint) UNCACHED_SDRAM(images->rd_start));
  88         linux_env_set("initrd_start", env_buf);
  89
  90         sprintf(env_buf, "0x%X", (uint) (images->rd_end - images->rd_start));
  91         linux_env_set("initrd_size", env_buf);
  92
  93         sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
  94         linux_env_set("flash_start", env_buf);
  95
  96         sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
  97         linux_env_set("flash_size", env_buf);
  98
  99         cp = getenv("ethaddr");
 100         if (cp)
 101                 linux_env_set("ethaddr", cp);
 102
 103         cp = getenv("eth1addr");
 104         if (cp)
 105                 linux_env_set("eth1addr", cp);
 106
 107         boot_jump_linux(images);
 108
 109         /* does not return */
 110         return 1;
 111 }
 112
 113 static void linux_params_init(ulong start, char *line)
 114 {
 115         char *next, *quote, *argp;
 116
 117         linux_argc = 1;
 118         linux_argv = (char **) start;
 119         linux_argv[0] = 0;
 120         argp = (char *) (linux_argv + LINUX_MAX_ARGS);
 121
 122         next = line;
 123
 124         while (line && *line && linux_argc < LINUX_MAX_ARGS) {
 125                 quote = strchr(line, '"');
 126                 next = strchr(line, ' ');
 127
 128                 while (next && quote && quote < next) {
 129                         /* we found a left quote before the next blank
 130                          * now we have to find the matching right quote
 131                          */
 132                         next = strchr(quote + 1, '"');
 133                         if (next) {
 134                                 quote = strchr(next + 1, '"');
 135                                 next = strchr(next + 1, ' ');
 136                         }
 137                 }
 138
 139                 if (!next)
 140                         next = line + strlen(line);
 141
 142                 linux_argv[linux_argc] = argp;
 143                 memcpy(argp, line, next - line);
 144                 argp[next - line] = 0;
 145
 146                 argp += next - line + 1;
 147                 linux_argc++;
 148
 149                 if (*next)
 150                         next++;
 151
 152                 line = next;
 153         }
 154
 155         linux_env = (char **) (((ulong) argp + 15) & ~15);
 156         linux_env[0] = 0;
 157         linux_env_p = (char *) (linux_env + LINUX_MAX_ENVS);
 158         linux_env_idx = 0;
 159 }
 160
 161 static void linux_env_set(char *env_name, char *env_val)
 162 {
 163         if (linux_env_idx < LINUX_MAX_ENVS - 1) {
 164                 linux_env[linux_env_idx] = linux_env_p;
 165
 166                 strcpy(linux_env_p, env_name);
 167                 linux_env_p += strlen(env_name);
 168
 169                 strcpy(linux_env_p, "=");
 170                 linux_env_p += 1;
 171
 172                 strcpy(linux_env_p, env_val);
 173                 linux_env_p += strlen(env_val);
 174
 175                 linux_env_p++;
 176                 linux_env[++linux_env_idx] = 0;
 177         }
 178 }