1 // SPDX-License-Identifier: GPL-2.0+
2 /* Copyright (C) 2011
3 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
4 * - Added prep subcommand support
5 * - Reorganized source - modeled after powerpc version
6 *
7 * (C) Copyright 2002
8 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9 * Marius Groeger <mgroeger@sysgo.de>
10 *
11 * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
12 */
13
14 #include <common.h>
15 #include <command.h>
16 #include <dm.h>
17 #include <dm/root.h>
18 #include <image.h>
19 #include <u-boot/zlib.h>
20 #include <asm/byteorder.h>
21 #include <linux/libfdt.h>
22 #include <mapmem.h>
23 #include <fdt_support.h>
24 #include <asm/bootm.h>
25 #include <asm/secure.h>
26 #include <linux/compiler.h>
27 #include <bootm.h>
28 #include <vxworks.h>
29
30 #ifdef CONFIG_ARMV7_NONSEC
31 #include <asm/armv7.h>
32 #endif
33 #include <asm/setup.h>
34
35 DECLARE_GLOBAL_DATA_PTR;
36
37 static struct tag *params;
38
get_sp(void)39 static ulong get_sp(void)
40 {
41 ulong ret;
42
43 asm("mov %0, sp" : "=r"(ret) : );
44 return ret;
45 }
46
arch_lmb_reserve(struct lmb * lmb)47 void arch_lmb_reserve(struct lmb *lmb)
48 {
49 ulong sp, bank_end;
50 int bank;
51
52 /*
53 * Booting a (Linux) kernel image
54 *
55 * Allocate space for command line and board info - the
56 * address should be as high as possible within the reach of
57 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
58 * memory, which means far enough below the current stack
59 * pointer.
60 */
61 sp = get_sp();
62 debug("## Current stack ends at 0x%08lx ", sp);
63
64 /* adjust sp by 4K to be safe */
65 sp -= 4096;
66 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
67 if (sp < gd->bd->bi_dram[bank].start)
68 continue;
69 bank_end = gd->bd->bi_dram[bank].start +
70 gd->bd->bi_dram[bank].size;
71 if (sp >= bank_end)
72 continue;
73 lmb_reserve(lmb, sp, bank_end - sp);
74 break;
75 }
76 }
77
board_quiesce_devices(void)78 __weak void board_quiesce_devices(void)
79 {
80 }
81
82 /**
83 * announce_and_cleanup() - Print message and prepare for kernel boot
84 *
85 * @fake: non-zero to do everything except actually boot
86 */
announce_and_cleanup(int fake)87 static void announce_and_cleanup(int fake)
88 {
89 printf("\nStarting kernel ...%s\n\n", fake ?
90 "(fake run for tracing)" : "");
91 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
92 #ifdef CONFIG_BOOTSTAGE_FDT
93 bootstage_fdt_add_report();
94 #endif
95 #ifdef CONFIG_BOOTSTAGE_REPORT
96 bootstage_report();
97 #endif
98
99 #ifdef CONFIG_USB_DEVICE
100 udc_disconnect();
101 #endif
102
103 board_quiesce_devices();
104
105 /*
106 * Call remove function of all devices with a removal flag set.
107 * This may be useful for last-stage operations, like cancelling
108 * of DMA operation or releasing device internal buffers.
109 */
110 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
111
112 cleanup_before_linux();
113 }
114
setup_start_tag(bd_t * bd)115 static void setup_start_tag (bd_t *bd)
116 {
117 params = (struct tag *)bd->bi_boot_params;
118
119 params->hdr.tag = ATAG_CORE;
120 params->hdr.size = tag_size (tag_core);
121
122 params->u.core.flags = 0;
123 params->u.core.pagesize = 0;
124 params->u.core.rootdev = 0;
125
126 params = tag_next (params);
127 }
128
setup_memory_tags(bd_t * bd)129 static void setup_memory_tags(bd_t *bd)
130 {
131 int i;
132
133 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
134 params->hdr.tag = ATAG_MEM;
135 params->hdr.size = tag_size (tag_mem32);
136
137 params->u.mem.start = bd->bi_dram[i].start;
138 params->u.mem.size = bd->bi_dram[i].size;
139
140 params = tag_next (params);
141 }
142 }
143
setup_commandline_tag(bd_t * bd,char * commandline)144 static void setup_commandline_tag(bd_t *bd, char *commandline)
145 {
146 char *p;
147
148 if (!commandline)
149 return;
150
151 /* eat leading white space */
152 for (p = commandline; *p == ' '; p++);
153
154 /* skip non-existent command lines so the kernel will still
155 * use its default command line.
156 */
157 if (*p == '\0')
158 return;
159
160 params->hdr.tag = ATAG_CMDLINE;
161 params->hdr.size =
162 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
163
164 strcpy (params->u.cmdline.cmdline, p);
165
166 params = tag_next (params);
167 }
168
setup_initrd_tag(bd_t * bd,ulong initrd_start,ulong initrd_end)169 static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
170 {
171 /* an ATAG_INITRD node tells the kernel where the compressed
172 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
173 */
174 params->hdr.tag = ATAG_INITRD2;
175 params->hdr.size = tag_size (tag_initrd);
176
177 params->u.initrd.start = initrd_start;
178 params->u.initrd.size = initrd_end - initrd_start;
179
180 params = tag_next (params);
181 }
182
setup_serial_tag(struct tag ** tmp)183 static void setup_serial_tag(struct tag **tmp)
184 {
185 struct tag *params = *tmp;
186 struct tag_serialnr serialnr;
187
188 get_board_serial(&serialnr);
189 params->hdr.tag = ATAG_SERIAL;
190 params->hdr.size = tag_size (tag_serialnr);
191 params->u.serialnr.low = serialnr.low;
192 params->u.serialnr.high= serialnr.high;
193 params = tag_next (params);
194 *tmp = params;
195 }
196
setup_revision_tag(struct tag ** in_params)197 static void setup_revision_tag(struct tag **in_params)
198 {
199 u32 rev = 0;
200
201 rev = get_board_rev();
202 params->hdr.tag = ATAG_REVISION;
203 params->hdr.size = tag_size (tag_revision);
204 params->u.revision.rev = rev;
205 params = tag_next (params);
206 }
207
setup_end_tag(bd_t * bd)208 static void setup_end_tag(bd_t *bd)
209 {
210 params->hdr.tag = ATAG_NONE;
211 params->hdr.size = 0;
212 }
213
setup_board_tags(struct tag ** in_params)214 __weak void setup_board_tags(struct tag **in_params) {}
215
216 #ifdef CONFIG_ARM64
do_nonsec_virt_switch(void)217 static void do_nonsec_virt_switch(void)
218 {
219 smp_kick_all_cpus();
220 dcache_disable(); /* flush cache before swtiching to EL2 */
221 }
222 #endif
223
224 /* Subcommand: PREP */
boot_prep_linux(bootm_headers_t * images)225 static void boot_prep_linux(bootm_headers_t *images)
226 {
227 char *commandline = env_get("bootargs");
228
229 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
230 #ifdef CONFIG_OF_LIBFDT
231 debug("using: FDT\n");
232 if (image_setup_linux(images)) {
233 printf("FDT creation failed! hanging...");
234 hang();
235 }
236 #endif
237 } else if (BOOTM_ENABLE_TAGS) {
238 debug("using: ATAGS\n");
239 setup_start_tag(gd->bd);
240 if (BOOTM_ENABLE_SERIAL_TAG)
241 setup_serial_tag(¶ms);
242 if (BOOTM_ENABLE_CMDLINE_TAG)
243 setup_commandline_tag(gd->bd, commandline);
244 if (BOOTM_ENABLE_REVISION_TAG)
245 setup_revision_tag(¶ms);
246 if (BOOTM_ENABLE_MEMORY_TAGS)
247 setup_memory_tags(gd->bd);
248 if (BOOTM_ENABLE_INITRD_TAG) {
249 /*
250 * In boot_ramdisk_high(), it may relocate ramdisk to
251 * a specified location. And set images->initrd_start &
252 * images->initrd_end to relocated ramdisk's start/end
253 * addresses. So use them instead of images->rd_start &
254 * images->rd_end when possible.
255 */
256 if (images->initrd_start && images->initrd_end) {
257 setup_initrd_tag(gd->bd, images->initrd_start,
258 images->initrd_end);
259 } else if (images->rd_start && images->rd_end) {
260 setup_initrd_tag(gd->bd, images->rd_start,
261 images->rd_end);
262 }
263 }
264 setup_board_tags(¶ms);
265 setup_end_tag(gd->bd);
266 } else {
267 printf("FDT and ATAGS support not compiled in - hanging\n");
268 hang();
269 }
270 }
271
armv7_boot_nonsec_default(void)272 __weak bool armv7_boot_nonsec_default(void)
273 {
274 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
275 return false;
276 #else
277 return true;
278 #endif
279 }
280
281 #ifdef CONFIG_ARMV7_NONSEC
armv7_boot_nonsec(void)282 bool armv7_boot_nonsec(void)
283 {
284 char *s = env_get("bootm_boot_mode");
285 bool nonsec = armv7_boot_nonsec_default();
286
287 if (s && !strcmp(s, "sec"))
288 nonsec = false;
289
290 if (s && !strcmp(s, "nonsec"))
291 nonsec = true;
292
293 return nonsec;
294 }
295 #endif
296
297 #ifdef CONFIG_ARM64
update_os_arch_secondary_cores(uint8_t os_arch)298 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
299 {
300 }
301
302 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
switch_to_el1(void)303 static void switch_to_el1(void)
304 {
305 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
306 (images.os.arch == IH_ARCH_ARM))
307 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
308 (u64)images.ft_addr, 0,
309 (u64)images.ep,
310 ES_TO_AARCH32);
311 else
312 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
313 images.ep,
314 ES_TO_AARCH64);
315 }
316 #endif
317 #endif
318
319 /* Subcommand: GO */
boot_jump_linux(bootm_headers_t * images,int flag)320 static void boot_jump_linux(bootm_headers_t *images, int flag)
321 {
322 #ifdef CONFIG_ARM64
323 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
324 void *res2);
325 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
326
327 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
328 void *res2))images->ep;
329
330 debug("## Transferring control to Linux (at address %lx)...\n",
331 (ulong) kernel_entry);
332 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
333
334 announce_and_cleanup(fake);
335
336 if (!fake) {
337 #ifdef CONFIG_ARMV8_PSCI
338 armv8_setup_psci();
339 #endif
340 do_nonsec_virt_switch();
341
342 update_os_arch_secondary_cores(images->os.arch);
343
344 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
345 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
346 (u64)switch_to_el1, ES_TO_AARCH64);
347 #else
348 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
349 (images->os.arch == IH_ARCH_ARM))
350 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
351 (u64)images->ft_addr, 0,
352 (u64)images->ep,
353 ES_TO_AARCH32);
354 else
355 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
356 images->ep,
357 ES_TO_AARCH64);
358 #endif
359 }
360 #else
361 unsigned long machid = gd->bd->bi_arch_number;
362 char *s;
363 void (*kernel_entry)(int zero, int arch, uint params);
364 unsigned long r2;
365 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
366
367 kernel_entry = (void (*)(int, int, uint))images->ep;
368 #ifdef CONFIG_CPU_V7M
369 ulong addr = (ulong)kernel_entry | 1;
370 kernel_entry = (void *)addr;
371 #endif
372 s = env_get("machid");
373 if (s) {
374 if (strict_strtoul(s, 16, &machid) < 0) {
375 debug("strict_strtoul failed!\n");
376 return;
377 }
378 printf("Using machid 0x%lx from environment\n", machid);
379 }
380
381 debug("## Transferring control to Linux (at address %08lx)" \
382 "...\n", (ulong) kernel_entry);
383 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
384 announce_and_cleanup(fake);
385
386 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
387 r2 = (unsigned long)images->ft_addr;
388 else
389 r2 = gd->bd->bi_boot_params;
390
391 if (!fake) {
392 #ifdef CONFIG_ARMV7_NONSEC
393 if (armv7_boot_nonsec()) {
394 armv7_init_nonsec();
395 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
396 0, machid, r2);
397 } else
398 #endif
399 kernel_entry(0, machid, r2);
400 }
401 #endif
402 }
403
404 /* Main Entry point for arm bootm implementation
405 *
406 * Modeled after the powerpc implementation
407 * DIFFERENCE: Instead of calling prep and go at the end
408 * they are called if subcommand is equal 0.
409 */
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)410 int do_bootm_linux(int flag, int argc, char * const argv[],
411 bootm_headers_t *images)
412 {
413 /* No need for those on ARM */
414 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
415 return -1;
416
417 if (flag & BOOTM_STATE_OS_PREP) {
418 boot_prep_linux(images);
419 return 0;
420 }
421
422 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
423 boot_jump_linux(images, flag);
424 return 0;
425 }
426
427 boot_prep_linux(images);
428 boot_jump_linux(images, flag);
429 return 0;
430 }
431
432 #if defined(CONFIG_BOOTM_VXWORKS)
boot_prep_vxworks(bootm_headers_t * images)433 void boot_prep_vxworks(bootm_headers_t *images)
434 {
435 #if defined(CONFIG_OF_LIBFDT)
436 int off;
437
438 if (images->ft_addr) {
439 off = fdt_path_offset(images->ft_addr, "/memory");
440 if (off > 0) {
441 if (arch_fixup_fdt(images->ft_addr))
442 puts("## WARNING: fixup memory failed!\n");
443 }
444 }
445 #endif
446 cleanup_before_linux();
447 }
boot_jump_vxworks(bootm_headers_t * images)448 void boot_jump_vxworks(bootm_headers_t *images)
449 {
450 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
451 armv8_setup_psci();
452 smp_kick_all_cpus();
453 #endif
454
455 /* ARM VxWorks requires device tree physical address to be passed */
456 ((void (*)(void *))images->ep)(images->ft_addr);
457 }
458 #endif
459