diff options
Diffstat (limited to 'lib_m68k/bootm.c')
| -rw-r--r-- | lib_m68k/bootm.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/lib_m68k/bootm.c b/lib_m68k/bootm.c new file mode 100644 index 0000000..e12d1d4 --- /dev/null +++ b/lib_m68k/bootm.c @@ -0,0 +1,169 @@ +/* + * (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 <zlib.h> +#include <bzlib.h> +#include <watchdog.h> +#include <environment.h> +#include <asm/byteorder.h> +#ifdef CONFIG_SHOW_BOOT_PROGRESS +# include <status_led.h> +#endif + +DECLARE_GLOBAL_DATA_PTR; + +extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); + +#define PHYSADDR(x) x + +#define LINUX_MAX_ENVS 256 +#define LINUX_MAX_ARGS 256 + +static ulong get_sp (void); +static void set_clocks_in_mhz (bd_t *kbd); +extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); + +void do_bootm_linux(cmd_tbl_t * cmdtp, int flag, + int argc, char *argv[], + bootm_headers_t *images) +{ + ulong sp; + + ulong rd_data_start, rd_data_end, rd_len; + ulong initrd_start, initrd_end; + int ret; + + ulong cmd_start, cmd_end; + ulong bootmap_base; + bd_t *kbd; + ulong ep = 0; + void (*kernel) (bd_t *, ulong, ulong, ulong, ulong); + struct lmb *lmb = images->lmb; + + bootmap_base = getenv_bootm_low(); + + /* + * Booting a (Linux) kernel image + * + * Allocate space for command line and board info - the + * address should be as high as possible within the reach of + * the kernel (see CFG_BOOTMAPSZ settings), but in unused + * memory, which means far enough below the current stack + * pointer. + */ + sp = get_sp(); + debug ("## Current stack ends at 0x%08lx ", sp); + + /* adjust sp by 1K to be safe */ + sp -= 1024; + lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + gd->ram_size - sp)); + + /* allocate space and init command line */ + ret = get_boot_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base); + if (ret) { + puts("ERROR with allocation of cmdline\n"); + goto error; + } + + /* allocate space for kernel copy of board info */ + ret = get_boot_kbd (lmb, &kbd, bootmap_base); + if (ret) { + puts("ERROR with allocation of kernel bd\n"); + goto error; + } + set_clocks_in_mhz(kbd); + + /* find kernel entry point */ + if (images->legacy_hdr_valid) { + ep = image_get_ep (images->legacy_hdr_os); +#if defined(CONFIG_FIT) + } else if (images->fit_uname_os) { + fit_unsupported_reset ("M68K linux bootm"); + do_reset (cmdtp, flag, argc, argv); +#endif + } else { + puts ("Could not find kernel entry point!\n"); + do_reset (cmdtp, flag, argc, argv); + } + kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep; + + /* find ramdisk */ + ret = get_ramdisk (cmdtp, flag, argc, argv, images, + IH_ARCH_M68K, &rd_data_start, &rd_data_end); + + if (ret) + goto error; + + rd_len = rd_data_end - rd_data_start; + ret = ramdisk_high (lmb, rd_data_start, rd_len, &initrd_start, &initrd_end); + if (ret) + goto error; + + debug("## Transferring control to Linux (at address %08lx) ...\n", + (ulong) kernel); + + show_boot_progress (15); + + if (!images->autostart) + return; + /* + * Linux Kernel Parameters (passing board info data): + * r3: ptr to board info data + * r4: initrd_start or 0 if no initrd + * r5: initrd_end - unused if r4 is 0 + * r6: Start of command line string + * r7: End of command line string + */ + (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); + /* does not return */ + return ; + +error: + if (images->autostart) + do_reset (cmdtp, flag, argc, argv); + return ; +} + +static ulong get_sp (void) +{ + ulong sp; + + asm("movel %%a7, %%d0\n" + "movel %%d0, %0\n": "=d"(sp): :"%d0"); + + return sp; +} + +static void set_clocks_in_mhz (bd_t *kbd) +{ + char *s; + + if ((s = getenv("clocks_in_mhz")) != NULL) { + /* convert all clock information to MHz */ + kbd->bi_intfreq /= 1000000L; + kbd->bi_busfreq /= 1000000L; + } +} |