2 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
3 * - Added prep subcommand support
4 * - Reorganized source - modeled after powerpc version
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Marius Groeger <mgroeger@sysgo.de>
10 * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <u-boot/zlib.h>
31 #include <asm/byteorder.h>
33 #include <fdt_support.h>
34 #include <asm/bootm.h>
35 #include <linux/compiler.h>
37 DECLARE_GLOBAL_DATA_PTR;
39 static struct tag *params;
41 static ulong get_sp(void)
45 asm("mov %0, sp" : "=r"(ret) : );
49 void arch_lmb_reserve(struct lmb *lmb)
54 * Booting a (Linux) kernel image
56 * Allocate space for command line and board info - the
57 * address should be as high as possible within the reach of
58 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
59 * memory, which means far enough below the current stack
63 debug("## Current stack ends at 0x%08lx ", sp);
65 /* adjust sp by 4K to be safe */
68 gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
71 static void announce_and_cleanup(void)
73 printf("\nStarting kernel ...\n\n");
74 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
75 #ifdef CONFIG_BOOTSTAGE_FDT
76 bootstage_fdt_add_report();
78 #ifdef CONFIG_BOOTSTAGE_REPORT
82 #ifdef CONFIG_USB_DEVICE
85 cleanup_before_linux();
88 static void setup_start_tag (bd_t *bd)
90 params = (struct tag *)bd->bi_boot_params;
92 params->hdr.tag = ATAG_CORE;
93 params->hdr.size = tag_size (tag_core);
95 params->u.core.flags = 0;
96 params->u.core.pagesize = 0;
97 params->u.core.rootdev = 0;
99 params = tag_next (params);
102 static void setup_memory_tags(bd_t *bd)
106 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
107 params->hdr.tag = ATAG_MEM;
108 params->hdr.size = tag_size (tag_mem32);
110 params->u.mem.start = bd->bi_dram[i].start;
111 params->u.mem.size = bd->bi_dram[i].size;
113 params = tag_next (params);
117 static void setup_commandline_tag(bd_t *bd, char *commandline)
124 /* eat leading white space */
125 for (p = commandline; *p == ' '; p++);
127 /* skip non-existent command lines so the kernel will still
128 * use its default command line.
133 params->hdr.tag = ATAG_CMDLINE;
135 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
137 strcpy (params->u.cmdline.cmdline, p);
139 params = tag_next (params);
142 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
144 /* an ATAG_INITRD node tells the kernel where the compressed
145 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
147 params->hdr.tag = ATAG_INITRD2;
148 params->hdr.size = tag_size (tag_initrd);
150 params->u.initrd.start = initrd_start;
151 params->u.initrd.size = initrd_end - initrd_start;
153 params = tag_next (params);
156 static void setup_serial_tag(struct tag **tmp)
158 struct tag *params = *tmp;
159 struct tag_serialnr serialnr;
161 get_board_serial(&serialnr);
162 params->hdr.tag = ATAG_SERIAL;
163 params->hdr.size = tag_size (tag_serialnr);
164 params->u.serialnr.low = serialnr.low;
165 params->u.serialnr.high= serialnr.high;
166 params = tag_next (params);
170 static void setup_revision_tag(struct tag **in_params)
174 rev = get_board_rev();
175 params->hdr.tag = ATAG_REVISION;
176 params->hdr.size = tag_size (tag_revision);
177 params->u.revision.rev = rev;
178 params = tag_next (params);
181 static void setup_end_tag(bd_t *bd)
183 params->hdr.tag = ATAG_NONE;
184 params->hdr.size = 0;
187 __weak void setup_board_tags(struct tag **in_params) {}
189 /* Subcommand: PREP */
190 static void boot_prep_linux(bootm_headers_t *images)
192 char *commandline = getenv("bootargs");
194 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
195 #ifdef CONFIG_OF_LIBFDT
196 debug("using: FDT\n");
197 if (image_setup_linux(images)) {
198 printf("FDT creation failed! hanging...");
202 } else if (BOOTM_ENABLE_TAGS) {
203 debug("using: ATAGS\n");
204 setup_start_tag(gd->bd);
205 if (BOOTM_ENABLE_SERIAL_TAG)
206 setup_serial_tag(¶ms);
207 if (BOOTM_ENABLE_CMDLINE_TAG)
208 setup_commandline_tag(gd->bd, commandline);
209 if (BOOTM_ENABLE_REVISION_TAG)
210 setup_revision_tag(¶ms);
211 if (BOOTM_ENABLE_MEMORY_TAGS)
212 setup_memory_tags(gd->bd);
213 if (BOOTM_ENABLE_INITRD_TAG) {
214 if (images->rd_start && images->rd_end) {
215 setup_initrd_tag(gd->bd, images->rd_start,
219 setup_board_tags(¶ms);
220 setup_end_tag(gd->bd);
222 printf("FDT and ATAGS support not compiled in - hanging\n");
228 static void boot_jump_linux(bootm_headers_t *images)
230 unsigned long machid = gd->bd->bi_arch_number;
232 void (*kernel_entry)(int zero, int arch, uint params);
235 kernel_entry = (void (*)(int, int, uint))images->ep;
237 s = getenv("machid");
239 strict_strtoul(s, 16, &machid);
240 printf("Using machid 0x%lx from environment\n", machid);
243 debug("## Transferring control to Linux (at address %08lx)" \
244 "...\n", (ulong) kernel_entry);
245 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
246 announce_and_cleanup();
248 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
249 r2 = (unsigned long)images->ft_addr;
251 r2 = gd->bd->bi_boot_params;
253 kernel_entry(0, machid, r2);
256 /* Main Entry point for arm bootm implementation
258 * Modeled after the powerpc implementation
259 * DIFFERENCE: Instead of calling prep and go at the end
260 * they are called if subcommand is equal 0.
262 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
264 /* No need for those on ARM */
265 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
268 if (flag & BOOTM_STATE_OS_PREP) {
269 boot_prep_linux(images);
273 if (flag & BOOTM_STATE_OS_GO) {
274 boot_jump_linux(images);
278 boot_prep_linux(images);
279 boot_jump_linux(images);
283 #ifdef CONFIG_CMD_BOOTZ
285 struct zimage_header {
292 #define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818
294 int bootz_setup(void *image, void **start, void **end)
296 struct zimage_header *zi = (struct zimage_header *)image;
298 if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
299 puts("Bad Linux ARM zImage magic!\n");
303 *start = (void *)zi->zi_start;
304 *end = (void *)zi->zi_end;
306 debug("Kernel image @ 0x%08x [ 0x%08x - 0x%08x ]\n",
307 (uint32_t)image, (uint32_t)*start, (uint32_t)*end);
311 #endif /* CONFIG_CMD_BOOTZ */