xref: /openbmc/u-boot/arch/arm/lib/bootm.c (revision e30d2bd4) 
1 /* Copyright (C) 2011
2  * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
3  *  - Added prep subcommand support
4  *  - Reorganized source - modeled after powerpc version
5  *
6  * (C) Copyright 2002
7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8  * Marius Groeger <mgroeger@sysgo.de>
9  *
10  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
11  *
12  * SPDX-License-Identifier:	GPL-2.0+
13  */
14 
15 #include <common.h>
16 #include <command.h>
17 #include <dm/device.h>
18 #include <dm/root.h>
19 #include <image.h>
20 #include <u-boot/zlib.h>
21 #include <asm/byteorder.h>
22 #include <libfdt.h>
23 #include <mapmem.h>
24 #include <fdt_support.h>
25 #include <asm/bootm.h>
26 #include <asm/secure.h>
27 #include <linux/compiler.h>
28 #include <bootm.h>
29 #include <vxworks.h>
30 
31 #ifdef CONFIG_ARMV7_NONSEC
32 #include <asm/armv7.h>
33 #endif
34 
35 DECLARE_GLOBAL_DATA_PTR;
36 
37 static struct tag *params;
38 
39 static ulong get_sp(void)
40 {
41 	ulong ret;
42 
43 	asm("mov %0, sp" : "=r"(ret) : );
44 	return ret;
45 }
46 
47 void arch_lmb_reserve(struct lmb *lmb)
48 {
49 	ulong sp;
50 
51 	/*
52 	 * Booting a (Linux) kernel image
53 	 *
54 	 * Allocate space for command line and board info - the
55 	 * address should be as high as possible within the reach of
56 	 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
57 	 * memory, which means far enough below the current stack
58 	 * pointer.
59 	 */
60 	sp = get_sp();
61 	debug("## Current stack ends at 0x%08lx ", sp);
62 
63 	/* adjust sp by 4K to be safe */
64 	sp -= 4096;
65 	lmb_reserve(lmb, sp,
66 		    gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
67 }
68 
69 __weak void board_quiesce_devices(void)
70 {
71 }
72 
73 /**
74  * announce_and_cleanup() - Print message and prepare for kernel boot
75  *
76  * @fake: non-zero to do everything except actually boot
77  */
78 static void announce_and_cleanup(int fake)
79 {
80 	printf("\nStarting kernel ...%s\n\n", fake ?
81 		"(fake run for tracing)" : "");
82 	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
83 #ifdef CONFIG_BOOTSTAGE_FDT
84 	bootstage_fdt_add_report();
85 #endif
86 #ifdef CONFIG_BOOTSTAGE_REPORT
87 	bootstage_report();
88 #endif
89 
90 #ifdef CONFIG_USB_DEVICE
91 	udc_disconnect();
92 #endif
93 
94 	board_quiesce_devices();
95 
96 	/*
97 	 * Call remove function of all devices with a removal flag set.
98 	 * This may be useful for last-stage operations, like cancelling
99 	 * of DMA operation or releasing device internal buffers.
100 	 */
101 	dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
102 
103 	cleanup_before_linux();
104 }
105 
106 static void setup_start_tag (bd_t *bd)
107 {
108 	params = (struct tag *)bd->bi_boot_params;
109 
110 	params->hdr.tag = ATAG_CORE;
111 	params->hdr.size = tag_size (tag_core);
112 
113 	params->u.core.flags = 0;
114 	params->u.core.pagesize = 0;
115 	params->u.core.rootdev = 0;
116 
117 	params = tag_next (params);
118 }
119 
120 static void setup_memory_tags(bd_t *bd)
121 {
122 	int i;
123 
124 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
125 		params->hdr.tag = ATAG_MEM;
126 		params->hdr.size = tag_size (tag_mem32);
127 
128 		params->u.mem.start = bd->bi_dram[i].start;
129 		params->u.mem.size = bd->bi_dram[i].size;
130 
131 		params = tag_next (params);
132 	}
133 }
134 
135 static void setup_commandline_tag(bd_t *bd, char *commandline)
136 {
137 	char *p;
138 
139 	if (!commandline)
140 		return;
141 
142 	/* eat leading white space */
143 	for (p = commandline; *p == ' '; p++);
144 
145 	/* skip non-existent command lines so the kernel will still
146 	 * use its default command line.
147 	 */
148 	if (*p == '\0')
149 		return;
150 
151 	params->hdr.tag = ATAG_CMDLINE;
152 	params->hdr.size =
153 		(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
154 
155 	strcpy (params->u.cmdline.cmdline, p);
156 
157 	params = tag_next (params);
158 }
159 
160 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
161 {
162 	/* an ATAG_INITRD node tells the kernel where the compressed
163 	 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
164 	 */
165 	params->hdr.tag = ATAG_INITRD2;
166 	params->hdr.size = tag_size (tag_initrd);
167 
168 	params->u.initrd.start = initrd_start;
169 	params->u.initrd.size = initrd_end - initrd_start;
170 
171 	params = tag_next (params);
172 }
173 
174 static void setup_serial_tag(struct tag **tmp)
175 {
176 	struct tag *params = *tmp;
177 	struct tag_serialnr serialnr;
178 
179 	get_board_serial(&serialnr);
180 	params->hdr.tag = ATAG_SERIAL;
181 	params->hdr.size = tag_size (tag_serialnr);
182 	params->u.serialnr.low = serialnr.low;
183 	params->u.serialnr.high= serialnr.high;
184 	params = tag_next (params);
185 	*tmp = params;
186 }
187 
188 static void setup_revision_tag(struct tag **in_params)
189 {
190 	u32 rev = 0;
191 
192 	rev = get_board_rev();
193 	params->hdr.tag = ATAG_REVISION;
194 	params->hdr.size = tag_size (tag_revision);
195 	params->u.revision.rev = rev;
196 	params = tag_next (params);
197 }
198 
199 static void setup_end_tag(bd_t *bd)
200 {
201 	params->hdr.tag = ATAG_NONE;
202 	params->hdr.size = 0;
203 }
204 
205 __weak void setup_board_tags(struct tag **in_params) {}
206 
207 #ifdef CONFIG_ARM64
208 static void do_nonsec_virt_switch(void)
209 {
210 	smp_kick_all_cpus();
211 	dcache_disable();	/* flush cache before swtiching to EL2 */
212 }
213 #endif
214 
215 /* Subcommand: PREP */
216 static void boot_prep_linux(bootm_headers_t *images)
217 {
218 	char *commandline = getenv("bootargs");
219 
220 	if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
221 #ifdef CONFIG_OF_LIBFDT
222 		debug("using: FDT\n");
223 		if (image_setup_linux(images)) {
224 			printf("FDT creation failed! hanging...");
225 			hang();
226 		}
227 #endif
228 	} else if (BOOTM_ENABLE_TAGS) {
229 		debug("using: ATAGS\n");
230 		setup_start_tag(gd->bd);
231 		if (BOOTM_ENABLE_SERIAL_TAG)
232 			setup_serial_tag(&params);
233 		if (BOOTM_ENABLE_CMDLINE_TAG)
234 			setup_commandline_tag(gd->bd, commandline);
235 		if (BOOTM_ENABLE_REVISION_TAG)
236 			setup_revision_tag(&params);
237 		if (BOOTM_ENABLE_MEMORY_TAGS)
238 			setup_memory_tags(gd->bd);
239 		if (BOOTM_ENABLE_INITRD_TAG) {
240 			/*
241 			 * In boot_ramdisk_high(), it may relocate ramdisk to
242 			 * a specified location. And set images->initrd_start &
243 			 * images->initrd_end to relocated ramdisk's start/end
244 			 * addresses. So use them instead of images->rd_start &
245 			 * images->rd_end when possible.
246 			 */
247 			if (images->initrd_start && images->initrd_end) {
248 				setup_initrd_tag(gd->bd, images->initrd_start,
249 						 images->initrd_end);
250 			} else if (images->rd_start && images->rd_end) {
251 				setup_initrd_tag(gd->bd, images->rd_start,
252 						 images->rd_end);
253 			}
254 		}
255 		setup_board_tags(&params);
256 		setup_end_tag(gd->bd);
257 	} else {
258 		printf("FDT and ATAGS support not compiled in - hanging\n");
259 		hang();
260 	}
261 }
262 
263 __weak bool armv7_boot_nonsec_default(void)
264 {
265 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
266 	return false;
267 #else
268 	return true;
269 #endif
270 }
271 
272 #ifdef CONFIG_ARMV7_NONSEC
273 bool armv7_boot_nonsec(void)
274 {
275 	char *s = getenv("bootm_boot_mode");
276 	bool nonsec = armv7_boot_nonsec_default();
277 
278 	if (s && !strcmp(s, "sec"))
279 		nonsec = false;
280 
281 	if (s && !strcmp(s, "nonsec"))
282 		nonsec = true;
283 
284 	return nonsec;
285 }
286 #endif
287 
288 #ifdef CONFIG_ARM64
289 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
290 {
291 }
292 
293 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
294 static void switch_to_el1(void)
295 {
296 	if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
297 	    (images.os.arch == IH_ARCH_ARM))
298 		armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
299 				    (u64)images.ft_addr, 0,
300 				    (u64)images.ep,
301 				    ES_TO_AARCH32);
302 	else
303 		armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
304 				    images.ep,
305 				    ES_TO_AARCH64);
306 }
307 #endif
308 #endif
309 
310 /* Subcommand: GO */
311 static void boot_jump_linux(bootm_headers_t *images, int flag)
312 {
313 #ifdef CONFIG_ARM64
314 	void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
315 			void *res2);
316 	int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
317 
318 	kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
319 				void *res2))images->ep;
320 
321 	debug("## Transferring control to Linux (at address %lx)...\n",
322 		(ulong) kernel_entry);
323 	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
324 
325 	announce_and_cleanup(fake);
326 
327 	if (!fake) {
328 #ifdef CONFIG_ARMV8_PSCI
329 		armv8_setup_psci();
330 #endif
331 		do_nonsec_virt_switch();
332 
333 		update_os_arch_secondary_cores(images->os.arch);
334 
335 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
336 		armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
337 				    (u64)switch_to_el1, ES_TO_AARCH64);
338 #else
339 		if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
340 		    (images->os.arch == IH_ARCH_ARM))
341 			armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
342 					    (u64)images->ft_addr, 0,
343 					    (u64)images->ep,
344 					    ES_TO_AARCH32);
345 		else
346 			armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
347 					    images->ep,
348 					    ES_TO_AARCH64);
349 #endif
350 	}
351 #else
352 	unsigned long machid = gd->bd->bi_arch_number;
353 	char *s;
354 	void (*kernel_entry)(int zero, int arch, uint params);
355 	unsigned long r2;
356 	int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
357 
358 	kernel_entry = (void (*)(int, int, uint))images->ep;
359 #ifdef CONFIG_CPU_V7M
360 	ulong addr = (ulong)kernel_entry | 1;
361 	kernel_entry = (void *)addr;
362 #endif
363 	s = getenv("machid");
364 	if (s) {
365 		if (strict_strtoul(s, 16, &machid) < 0) {
366 			debug("strict_strtoul failed!\n");
367 			return;
368 		}
369 		printf("Using machid 0x%lx from environment\n", machid);
370 	}
371 
372 	debug("## Transferring control to Linux (at address %08lx)" \
373 		"...\n", (ulong) kernel_entry);
374 	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
375 	announce_and_cleanup(fake);
376 
377 	if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
378 		r2 = (unsigned long)images->ft_addr;
379 	else
380 		r2 = gd->bd->bi_boot_params;
381 
382 	if (!fake) {
383 #ifdef CONFIG_ARMV7_NONSEC
384 		if (armv7_boot_nonsec()) {
385 			armv7_init_nonsec();
386 			secure_ram_addr(_do_nonsec_entry)(kernel_entry,
387 							  0, machid, r2);
388 		} else
389 #endif
390 			kernel_entry(0, machid, r2);
391 	}
392 #endif
393 }
394 
395 /* Main Entry point for arm bootm implementation
396  *
397  * Modeled after the powerpc implementation
398  * DIFFERENCE: Instead of calling prep and go at the end
399  * they are called if subcommand is equal 0.
400  */
401 int do_bootm_linux(int flag, int argc, char * const argv[],
402 		   bootm_headers_t *images)
403 {
404 	/* No need for those on ARM */
405 	if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
406 		return -1;
407 
408 	if (flag & BOOTM_STATE_OS_PREP) {
409 		boot_prep_linux(images);
410 		return 0;
411 	}
412 
413 	if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
414 		boot_jump_linux(images, flag);
415 		return 0;
416 	}
417 
418 	boot_prep_linux(images);
419 	boot_jump_linux(images, flag);
420 	return 0;
421 }
422 
423 #if defined(CONFIG_BOOTM_VXWORKS)
424 void boot_prep_vxworks(bootm_headers_t *images)
425 {
426 #if defined(CONFIG_OF_LIBFDT)
427 	int off;
428 
429 	if (images->ft_addr) {
430 		off = fdt_path_offset(images->ft_addr, "/memory");
431 		if (off < 0) {
432 			if (arch_fixup_fdt(images->ft_addr))
433 				puts("## WARNING: fixup memory failed!\n");
434 		}
435 	}
436 #endif
437 	cleanup_before_linux();
438 }
439 void boot_jump_vxworks(bootm_headers_t *images)
440 {
441 	/* ARM VxWorks requires device tree physical address to be passed */
442 	((void (*)(void *))images->ep)(images->ft_addr);
443 }
444 #endif
445