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 <bootstage.h>
16 #include <command.h>
17 #include <cpu_func.h>
18 #include <dm.h>
19 #include <hang.h>
20 #include <lmb.h>
21 #include <log.h>
22 #include <asm/global_data.h>
23 #include <dm/root.h>
24 #include <env.h>
25 #include <image.h>
26 #include <u-boot/zlib.h>
27 #include <asm/byteorder.h>
28 #include <linux/libfdt.h>
29 #include <mapmem.h>
30 #include <fdt_support.h>
31 #include <asm/bootm.h>
32 #include <asm/secure.h>
33 #include <linux/compiler.h>
34 #include <bootm.h>
35 #include <vxworks.h>
36 #include <asm/cache.h>
37
38 #ifdef CONFIG_ARMV7_NONSEC
39 #include <asm/armv7.h>
40 #endif
41 #include <asm/setup.h>
42
43 DECLARE_GLOBAL_DATA_PTR;
44
45 static struct tag *params;
46
get_sp(void)47 static ulong get_sp(void)
48 {
49 ulong ret;
50
51 asm("mov %0, sp" : "=r"(ret) : );
52 return ret;
53 }
54
arch_lmb_reserve(struct lmb * lmb)55 void arch_lmb_reserve(struct lmb *lmb)
56 {
57 ulong sp, bank_end;
58 int bank;
59
60 /*
61 * Booting a (Linux) kernel image
62 *
63 * Allocate space for command line and board info - the
64 * address should be as high as possible within the reach of
65 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
66 * memory, which means far enough below the current stack
67 * pointer.
68 */
69 sp = get_sp();
70 debug("## Current stack ends at 0x%08lx ", sp);
71
72 /* adjust sp by 4K to be safe */
73 sp -= 4096;
74 for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
75 if (!gd->bd->bi_dram[bank].size ||
76 sp < gd->bd->bi_dram[bank].start)
77 continue;
78 /* Watch out for RAM at end of address space! */
79 bank_end = gd->bd->bi_dram[bank].start +
80 gd->bd->bi_dram[bank].size - 1;
81 if (sp > bank_end)
82 continue;
83 if (bank_end > gd->ram_top)
84 bank_end = gd->ram_top - 1;
85
86 lmb_reserve(lmb, sp, bank_end - sp + 1);
87 break;
88 }
89 }
90
board_quiesce_devices(void)91 __weak void board_quiesce_devices(void)
92 {
93 }
94
95 /**
96 * announce_and_cleanup() - Print message and prepare for kernel boot
97 *
98 * @fake: non-zero to do everything except actually boot
99 */
announce_and_cleanup(int fake)100 static void announce_and_cleanup(int fake)
101 {
102 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
103 #ifdef CONFIG_BOOTSTAGE_FDT
104 bootstage_fdt_add_report();
105 #endif
106 #ifdef CONFIG_BOOTSTAGE_REPORT
107 bootstage_report();
108 #endif
109
110 #ifdef CONFIG_USB_DEVICE
111 udc_disconnect();
112 #endif
113
114 board_quiesce_devices();
115
116 printf("\nStarting kernel ...%s\n\n", fake ?
117 "(fake run for tracing)" : "");
118 /*
119 * Call remove function of all devices with a removal flag set.
120 * This may be useful for last-stage operations, like cancelling
121 * of DMA operation or releasing device internal buffers.
122 */
123 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL | DM_REMOVE_NON_VITAL);
124
125 /* Remove all active vital devices next */
126 dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
127
128 cleanup_before_linux();
129 }
130
setup_start_tag(struct bd_info * bd)131 static void setup_start_tag (struct bd_info *bd)
132 {
133 params = (struct tag *)bd->bi_boot_params;
134
135 params->hdr.tag = ATAG_CORE;
136 params->hdr.size = tag_size (tag_core);
137
138 params->u.core.flags = 0;
139 params->u.core.pagesize = 0;
140 params->u.core.rootdev = 0;
141
142 params = tag_next (params);
143 }
144
setup_memory_tags(struct bd_info * bd)145 static void setup_memory_tags(struct bd_info *bd)
146 {
147 int i;
148
149 for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
150 params->hdr.tag = ATAG_MEM;
151 params->hdr.size = tag_size (tag_mem32);
152
153 params->u.mem.start = bd->bi_dram[i].start;
154 params->u.mem.size = bd->bi_dram[i].size;
155
156 params = tag_next (params);
157 }
158 }
159
setup_commandline_tag(struct bd_info * bd,char * commandline)160 static void setup_commandline_tag(struct bd_info *bd, char *commandline)
161 {
162 char *p;
163
164 if (!commandline)
165 return;
166
167 /* eat leading white space */
168 for (p = commandline; *p == ' '; p++);
169
170 /* skip non-existent command lines so the kernel will still
171 * use its default command line.
172 */
173 if (*p == '\0')
174 return;
175
176 params->hdr.tag = ATAG_CMDLINE;
177 params->hdr.size =
178 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
179
180 strcpy (params->u.cmdline.cmdline, p);
181
182 params = tag_next (params);
183 }
184
setup_initrd_tag(struct bd_info * bd,ulong initrd_start,ulong initrd_end)185 static void setup_initrd_tag(struct bd_info *bd, ulong initrd_start,
186 ulong initrd_end)
187 {
188 /* an ATAG_INITRD node tells the kernel where the compressed
189 * ramdisk can be found. ATAG_RDIMG is a better name, actually.
190 */
191 params->hdr.tag = ATAG_INITRD2;
192 params->hdr.size = tag_size (tag_initrd);
193
194 params->u.initrd.start = initrd_start;
195 params->u.initrd.size = initrd_end - initrd_start;
196
197 params = tag_next (params);
198 }
199
setup_serial_tag(struct tag ** tmp)200 static void setup_serial_tag(struct tag **tmp)
201 {
202 struct tag *params = *tmp;
203 struct tag_serialnr serialnr;
204
205 get_board_serial(&serialnr);
206 params->hdr.tag = ATAG_SERIAL;
207 params->hdr.size = tag_size (tag_serialnr);
208 params->u.serialnr.low = serialnr.low;
209 params->u.serialnr.high= serialnr.high;
210 params = tag_next (params);
211 *tmp = params;
212 }
213
setup_revision_tag(struct tag ** in_params)214 static void setup_revision_tag(struct tag **in_params)
215 {
216 u32 rev = 0;
217
218 rev = get_board_rev();
219 params->hdr.tag = ATAG_REVISION;
220 params->hdr.size = tag_size (tag_revision);
221 params->u.revision.rev = rev;
222 params = tag_next (params);
223 }
224
setup_end_tag(struct bd_info * bd)225 static void setup_end_tag(struct bd_info *bd)
226 {
227 params->hdr.tag = ATAG_NONE;
228 params->hdr.size = 0;
229 }
230
setup_board_tags(struct tag ** in_params)231 __weak void setup_board_tags(struct tag **in_params) {}
232
233 #ifdef CONFIG_ARM64
do_nonsec_virt_switch(void)234 static void do_nonsec_virt_switch(void)
235 {
236 smp_kick_all_cpus();
237 dcache_disable(); /* flush cache before swtiching to EL2 */
238 }
239 #endif
240
board_prep_linux(bootm_headers_t * images)241 __weak void board_prep_linux(bootm_headers_t *images) { }
242
243 /* Subcommand: PREP */
boot_prep_linux(bootm_headers_t * images)244 static void boot_prep_linux(bootm_headers_t *images)
245 {
246 char *commandline = env_get("bootargs");
247
248 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
249 #ifdef CONFIG_OF_LIBFDT
250 debug("using: FDT\n");
251 if (image_setup_linux(images)) {
252 printf("FDT creation failed! hanging...");
253 hang();
254 }
255 #endif
256 } else if (BOOTM_ENABLE_TAGS) {
257 debug("using: ATAGS\n");
258 setup_start_tag(gd->bd);
259 if (BOOTM_ENABLE_SERIAL_TAG)
260 setup_serial_tag(¶ms);
261 if (BOOTM_ENABLE_CMDLINE_TAG)
262 setup_commandline_tag(gd->bd, commandline);
263 if (BOOTM_ENABLE_REVISION_TAG)
264 setup_revision_tag(¶ms);
265 if (BOOTM_ENABLE_MEMORY_TAGS)
266 setup_memory_tags(gd->bd);
267 if (BOOTM_ENABLE_INITRD_TAG) {
268 /*
269 * In boot_ramdisk_high(), it may relocate ramdisk to
270 * a specified location. And set images->initrd_start &
271 * images->initrd_end to relocated ramdisk's start/end
272 * addresses. So use them instead of images->rd_start &
273 * images->rd_end when possible.
274 */
275 if (images->initrd_start && images->initrd_end) {
276 setup_initrd_tag(gd->bd, images->initrd_start,
277 images->initrd_end);
278 } else if (images->rd_start && images->rd_end) {
279 setup_initrd_tag(gd->bd, images->rd_start,
280 images->rd_end);
281 }
282 }
283 setup_board_tags(¶ms);
284 setup_end_tag(gd->bd);
285 } else {
286 printf("FDT and ATAGS support not compiled in - hanging\n");
287 hang();
288 }
289
290 board_prep_linux(images);
291 }
292
armv7_boot_nonsec_default(void)293 __weak bool armv7_boot_nonsec_default(void)
294 {
295 #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT
296 return false;
297 #else
298 return true;
299 #endif
300 }
301
302 #ifdef CONFIG_ARMV7_NONSEC
armv7_boot_nonsec(void)303 bool armv7_boot_nonsec(void)
304 {
305 char *s = env_get("bootm_boot_mode");
306 bool nonsec = armv7_boot_nonsec_default();
307
308 if (s && !strcmp(s, "sec"))
309 nonsec = false;
310
311 if (s && !strcmp(s, "nonsec"))
312 nonsec = true;
313
314 return nonsec;
315 }
316 #endif
317
318 #ifdef CONFIG_ARM64
update_os_arch_secondary_cores(uint8_t os_arch)319 __weak void update_os_arch_secondary_cores(uint8_t os_arch)
320 {
321 }
322
323 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
switch_to_el1(void)324 static void switch_to_el1(void)
325 {
326 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
327 (images.os.arch == IH_ARCH_ARM))
328 armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number,
329 (u64)images.ft_addr, 0,
330 (u64)images.ep,
331 ES_TO_AARCH32);
332 else
333 armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0,
334 images.ep,
335 ES_TO_AARCH64);
336 }
337 #endif
338 #endif
339
340 /* Subcommand: GO */
boot_jump_linux(bootm_headers_t * images,int flag)341 static void boot_jump_linux(bootm_headers_t *images, int flag)
342 {
343 #ifdef CONFIG_ARM64
344 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1,
345 void *res2);
346 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
347
348 kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1,
349 void *res2))images->ep;
350
351 debug("## Transferring control to Linux (at address %lx)...\n",
352 (ulong) kernel_entry);
353 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
354
355 announce_and_cleanup(fake);
356
357 if (!fake) {
358 #ifdef CONFIG_ARMV8_PSCI
359 armv8_setup_psci();
360 #endif
361 do_nonsec_virt_switch();
362
363 update_os_arch_secondary_cores(images->os.arch);
364
365 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
366 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
367 (u64)switch_to_el1, ES_TO_AARCH64);
368 #else
369 if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) &&
370 (images->os.arch == IH_ARCH_ARM))
371 armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number,
372 (u64)images->ft_addr, 0,
373 (u64)images->ep,
374 ES_TO_AARCH32);
375 else
376 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0,
377 images->ep,
378 ES_TO_AARCH64);
379 #endif
380 }
381 #else
382 unsigned long machid = gd->bd->bi_arch_number;
383 char *s;
384 void (*kernel_entry)(int zero, int arch, uint params);
385 unsigned long r2;
386 int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
387
388 kernel_entry = (void (*)(int, int, uint))images->ep;
389 #ifdef CONFIG_CPU_V7M
390 ulong addr = (ulong)kernel_entry | 1;
391 kernel_entry = (void *)addr;
392 #endif
393 s = env_get("machid");
394 if (s) {
395 if (strict_strtoul(s, 16, &machid) < 0) {
396 debug("strict_strtoul failed!\n");
397 return;
398 }
399 printf("Using machid 0x%lx from environment\n", machid);
400 }
401
402 debug("## Transferring control to Linux (at address %08lx)" \
403 "...\n", (ulong) kernel_entry);
404 bootstage_mark(BOOTSTAGE_ID_RUN_OS);
405 announce_and_cleanup(fake);
406
407 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
408 r2 = (unsigned long)images->ft_addr;
409 else
410 r2 = gd->bd->bi_boot_params;
411
412 if (!fake) {
413 #ifdef CONFIG_ARMV7_NONSEC
414 if (armv7_boot_nonsec()) {
415 armv7_init_nonsec();
416 secure_ram_addr(_do_nonsec_entry)(kernel_entry,
417 0, machid, r2);
418 } else
419 #endif
420 kernel_entry(0, machid, r2);
421 }
422 #endif
423 }
424
425 /* Main Entry point for arm bootm implementation
426 *
427 * Modeled after the powerpc implementation
428 * DIFFERENCE: Instead of calling prep and go at the end
429 * they are called if subcommand is equal 0.
430 */
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)431 int do_bootm_linux(int flag, int argc, char *const argv[],
432 bootm_headers_t *images)
433 {
434 /* No need for those on ARM */
435 if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
436 return -1;
437
438 if (flag & BOOTM_STATE_OS_PREP) {
439 boot_prep_linux(images);
440 return 0;
441 }
442
443 if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
444 boot_jump_linux(images, flag);
445 return 0;
446 }
447
448 boot_prep_linux(images);
449 boot_jump_linux(images, flag);
450 return 0;
451 }
452
453 #if defined(CONFIG_BOOTM_VXWORKS)
boot_prep_vxworks(bootm_headers_t * images)454 void boot_prep_vxworks(bootm_headers_t *images)
455 {
456 #if defined(CONFIG_OF_LIBFDT)
457 int off;
458
459 if (images->ft_addr) {
460 off = fdt_path_offset(images->ft_addr, "/memory");
461 if (off > 0) {
462 if (arch_fixup_fdt(images->ft_addr))
463 puts("## WARNING: fixup memory failed!\n");
464 }
465 }
466 #endif
467 cleanup_before_linux();
468 }
boot_jump_vxworks(bootm_headers_t * images)469 void boot_jump_vxworks(bootm_headers_t *images)
470 {
471 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
472 armv8_setup_psci();
473 smp_kick_all_cpus();
474 #endif
475
476 /* ARM VxWorks requires device tree physical address to be passed */
477 ((void (*)(void *))images->ep)(images->ft_addr);
478 }
479 #endif
480