/*
 * (C) Copyright 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>

DECLARE_GLOBAL_DATA_PTR;

#define LINUX_MAX_ENVS          256
#define LINUX_MAX_ARGS          256

static int      linux_argc;
static char **  linux_argv;

static char **  linux_env;
static char *   linux_env_p;
static int      linux_env_idx;

static void linux_params_init (ulong start, char * commandline);
static void linux_env_set (char * env_name, char * env_val);

int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
{
        void    (*theKernel) (int, char **, char **, int *);
        char    *commandline = getenv ("bootargs");
        char    env_buf[12];
        char    *cp;

        if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
                return 1;

        /* find kernel entry point */
        theKernel = (void (*)(int, char **, char **, int *))images->ep;

        show_boot_progress (15);

#ifdef DEBUG
        printf ("## Transferring control to Linux (at address %08lx) ...\n",
                (ulong) theKernel);
#endif

        linux_params_init (UNCACHED_SDRAM (gd->bd->bi_boot_params), commandline);

#ifdef CONFIG_MEMSIZE_IN_BYTES
        sprintf (env_buf, "%lu", (ulong)gd->ram_size);
        debug ("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
#else
        sprintf (env_buf, "%lu", (ulong)(gd->ram_size >> 20));
        debug ("## Giving linux memsize in MB, %lu\n", (ulong)(gd->ram_size >> 20));
#endif /* CONFIG_MEMSIZE_IN_BYTES */

        linux_env_set ("memsize", env_buf);

        sprintf (env_buf, "0x%08X", (uint) UNCACHED_SDRAM (images->rd_start));
        linux_env_set ("initrd_start", env_buf);

        sprintf (env_buf, "0x%X", (uint) (images->rd_end - images->rd_start));
        linux_env_set ("initrd_size", env_buf);

        sprintf (env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
        linux_env_set ("flash_start", env_buf);

        sprintf (env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
        linux_env_set ("flash_size", env_buf);

        cp = getenv("ethaddr");
        if (cp != NULL) {
                linux_env_set("ethaddr", cp);
        }

        cp = getenv("eth1addr");
        if (cp != NULL) {
                linux_env_set("eth1addr", cp);
        }

        /* we assume that the kernel is in place */
        printf ("\nStarting kernel ...\n\n");

        theKernel (linux_argc, linux_argv, linux_env, 0);
        /* does not return */
        return 1;
}

static void linux_params_init (ulong start, char *line)
{
        char *next, *quote, *argp;

        linux_argc = 1;
        linux_argv = (char **) start;
        linux_argv[0] = 0;
        argp = (char *) (linux_argv + LINUX_MAX_ARGS);

        next = line;

        while (line && *line && linux_argc < LINUX_MAX_ARGS) {
                quote = strchr (line, '"');
                next = strchr (line, ' ');

                while (next != NULL && quote != NULL && quote < next) {
                        /* we found a left quote before the next blank
                         * now we have to find the matching right quote
                         */
                        next = strchr (quote + 1, '"');
                        if (next != NULL) {
                                quote = strchr (next + 1, '"');
                                next = strchr (next + 1, ' ');
                        }
                }

                if (next == NULL) {
                        next = line + strlen (line);
                }

                linux_argv[linux_argc] = argp;
                memcpy (argp, line, next - line);
                argp[next - line] = 0;

                argp += next - line + 1;
                linux_argc++;

                if (*next)
                        next++;

                line = next;
        }

        linux_env = (char **) (((ulong) argp + 15) & ~15);
        linux_env[0] = 0;
        linux_env_p = (char *) (linux_env + LINUX_MAX_ENVS);
        linux_env_idx = 0;
}

static void linux_env_set (char *env_name, char *env_val)
{
        if (linux_env_idx < LINUX_MAX_ENVS - 1) {
                linux_env[linux_env_idx] = linux_env_p;

                strcpy (linux_env_p, env_name);
                linux_env_p += strlen (env_name);

                strcpy (linux_env_p, "=");
                linux_env_p += 1;

                strcpy (linux_env_p, env_val);
                linux_env_p += strlen (env_val);

                linux_env_p++;
                linux_env[++linux_env_idx] = 0;
        }
}