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