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 <bzlib.h> 29 #include <watchdog.h> 30 #include <environment.h> 31 #include <asm/byteorder.h> 32 #ifdef CONFIG_SHOW_BOOT_PROGRESS 33 # include <status_led.h> 34 #endif 35 36 DECLARE_GLOBAL_DATA_PTR; 37 38 #define PHYSADDR(x) x 39 40 #define LINUX_MAX_ENVS 256 41 #define LINUX_MAX_ARGS 256 42 43 static ulong get_sp (void); 44 static void set_clocks_in_mhz (bd_t *kbd); 45 46 void arch_lmb_reserve(struct lmb *lmb) 47 { 48 ulong sp; 49 50 /* 51 * Booting a (Linux) kernel image 52 * 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 57 * pointer. 58 */ 59 sp = get_sp(); 60 debug ("## Current stack ends at 0x%08lx ", sp); 61 62 /* adjust sp by 1K to be safe */ 63 sp -= 1024; 64 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp)); 65 } 66 67 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images) 68 { 69 ulong rd_len; 70 ulong initrd_start, initrd_end; 71 int ret; 72 73 ulong cmd_start, cmd_end; 74 bd_t *kbd; 75 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong); 76 struct lmb *lmb = &images->lmb; 77 78 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO)) 79 return 1; 80 81 /* allocate space for kernel copy of board info */ 82 ret = boot_get_kbd (lmb, &kbd); 83 if (ret) { 84 puts("ERROR with allocation of kernel bd\n"); 85 goto error; 86 } 87 set_clocks_in_mhz(kbd); 88 89 ret = image_setup_linux(images); 90 if (ret) 91 goto error; 92 93 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep; 94 95 debug("## Transferring control to Linux (at address %08lx) ...\n", 96 (ulong) kernel); 97 98 bootstage_mark(BOOTSTAGE_ID_RUN_OS); 99 100 /* 101 * Linux Kernel Parameters (passing board info data): 102 * sp+00: Ignore, side effect of using jsr to jump to kernel 103 * sp+04: ptr to board info data 104 * sp+08: initrd_start or 0 if no initrd 105 * sp+12: initrd_end - unused if initrd_start is 0 106 * sp+16: Start of command line string 107 * sp+20: End of command line string 108 */ 109 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); 110 /* does not return */ 111 error: 112 return 1; 113 } 114 115 static ulong get_sp (void) 116 { 117 ulong sp; 118 119 asm("movel %%a7, %%d0\n" 120 "movel %%d0, %0\n": "=d"(sp): :"%d0"); 121 122 return sp; 123 } 124 125 static void set_clocks_in_mhz (bd_t *kbd) 126 { 127 char *s; 128 129 if ((s = getenv("clocks_in_mhz")) != NULL) { 130 /* convert all clock information to MHz */ 131 kbd->bi_intfreq /= 1000000L; 132 kbd->bi_busfreq /= 1000000L; 133 } 134 } 135