3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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
27 #include <u-boot/zlib.h>
30 #include <environment.h>
31 #include <asm/byteorder.h>
32 #ifdef CONFIG_SHOW_BOOT_PROGRESS
33 # include <status_led.h>
36 DECLARE_GLOBAL_DATA_PTR;
40 #define LINUX_MAX_ENVS 256
41 #define LINUX_MAX_ARGS 256
43 static ulong get_sp (void);
44 static void set_clocks_in_mhz (bd_t *kbd);
46 void arch_lmb_reserve(struct lmb *lmb)
51 * Booting a (Linux) kernel image
53 * Allocate space for command line and board info - the
54 * address should be as high as possible within the reach of
55 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
56 * memory, which means far enough below the current stack
60 debug ("## Current stack ends at 0x%08lx ", sp);
62 /* adjust sp by 1K to be safe */
64 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
67 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
70 ulong initrd_start, initrd_end;
73 ulong cmd_start, cmd_end;
76 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
77 struct lmb *lmb = &images->lmb;
79 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
82 bootmap_base = getenv_bootm_low();
84 /* allocate space and init command line */
85 ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
87 puts("ERROR with allocation of cmdline\n");
91 /* allocate space for kernel copy of board info */
92 ret = boot_get_kbd (lmb, &kbd, bootmap_base);
94 puts("ERROR with allocation of kernel bd\n");
97 set_clocks_in_mhz(kbd);
99 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
101 rd_len = images->rd_end - images->rd_start;
102 ret = boot_ramdisk_high (lmb, images->rd_start, rd_len,
103 &initrd_start, &initrd_end);
107 debug("## Transferring control to Linux (at address %08lx) ...\n",
110 show_boot_progress (15);
113 * Linux Kernel Parameters (passing board info data):
114 * sp+00: Ignore, side effect of using jsr to jump to kernel
115 * sp+04: ptr to board info data
116 * sp+08: initrd_start or 0 if no initrd
117 * sp+12: initrd_end - unused if initrd_start is 0
118 * sp+16: Start of command line string
119 * sp+20: End of command line string
121 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
122 /* does not return */
127 static ulong get_sp (void)
131 asm("movel %%a7, %%d0\n"
132 "movel %%d0, %0\n": "=d"(sp): :"%d0");
137 static void set_clocks_in_mhz (bd_t *kbd)
141 if ((s = getenv("clocks_in_mhz")) != NULL) {
142 /* convert all clock information to MHz */
143 kbd->bi_intfreq /= 1000000L;
144 kbd->bi_busfreq /= 1000000L;