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