Commit | Line | Data |
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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0 |
e169cfbe GL |
2 | /* |
3 | * Functions for working with the Flattened Device Tree data format | |
4 | * | |
5 | * Copyright 2009 Benjamin Herrenschmidt, IBM Corp | |
6 | * benh@kernel.crashing.org | |
e169cfbe GL |
7 | */ |
8 | ||
bd0096d7 | 9 | #define pr_fmt(fmt) "OF: fdt: " fmt |
606ad42a | 10 | |
7b937cc2 | 11 | #include <linux/acpi.h> |
f7e7ce93 | 12 | #include <linux/crash_dump.h> |
08d53aa5 | 13 | #include <linux/crc32.h> |
41f88009 | 14 | #include <linux/kernel.h> |
f7b3a835 | 15 | #include <linux/initrd.h> |
a1727da5 | 16 | #include <linux/memblock.h> |
f8062386 | 17 | #include <linux/mutex.h> |
e169cfbe GL |
18 | #include <linux/of.h> |
19 | #include <linux/of_fdt.h> | |
e8d9d1f5 | 20 | #include <linux/sizes.h> |
4ef7b373 JK |
21 | #include <linux/string.h> |
22 | #include <linux/errno.h> | |
fe140423 | 23 | #include <linux/slab.h> |
e6a6928c | 24 | #include <linux/libfdt.h> |
b0a6fb36 | 25 | #include <linux/debugfs.h> |
fb11ffe7 | 26 | #include <linux/serial_core.h> |
08d53aa5 | 27 | #include <linux/sysfs.h> |
428826f5 | 28 | #include <linux/random.h> |
51975db0 | 29 | |
c89810ac | 30 | #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
4ef7b373 JK |
31 | #include <asm/page.h> |
32 | ||
81d0848f FR |
33 | #include "of_private.h" |
34 | ||
7b937cc2 FR |
35 | /* |
36 | * __dtb_empty_root_begin[] and __dtb_empty_root_end[] magically created by | |
37 | * cmd_dt_S_dtb in scripts/Makefile.lib | |
38 | */ | |
39 | extern uint8_t __dtb_empty_root_begin[]; | |
40 | extern uint8_t __dtb_empty_root_end[]; | |
41 | ||
704033ce LA |
42 | /* |
43 | * of_fdt_limit_memory - limit the number of regions in the /memory node | |
44 | * @limit: maximum entries | |
45 | * | |
46 | * Adjust the flattened device tree to have at most 'limit' number of | |
47 | * memory entries in the /memory node. This function may be called | |
48 | * any time after initial_boot_param is set. | |
49 | */ | |
9b4d2b63 | 50 | void __init of_fdt_limit_memory(int limit) |
704033ce LA |
51 | { |
52 | int memory; | |
53 | int len; | |
54 | const void *val; | |
55 | int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
56 | int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; | |
17a70355 RH |
57 | const __be32 *addr_prop; |
58 | const __be32 *size_prop; | |
704033ce LA |
59 | int root_offset; |
60 | int cell_size; | |
61 | ||
62 | root_offset = fdt_path_offset(initial_boot_params, "/"); | |
63 | if (root_offset < 0) | |
64 | return; | |
65 | ||
66 | addr_prop = fdt_getprop(initial_boot_params, root_offset, | |
67 | "#address-cells", NULL); | |
68 | if (addr_prop) | |
69 | nr_address_cells = fdt32_to_cpu(*addr_prop); | |
70 | ||
71 | size_prop = fdt_getprop(initial_boot_params, root_offset, | |
72 | "#size-cells", NULL); | |
73 | if (size_prop) | |
74 | nr_size_cells = fdt32_to_cpu(*size_prop); | |
75 | ||
76 | cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); | |
77 | ||
78 | memory = fdt_path_offset(initial_boot_params, "/memory"); | |
79 | if (memory > 0) { | |
80 | val = fdt_getprop(initial_boot_params, memory, "reg", &len); | |
81 | if (len > limit*cell_size) { | |
82 | len = limit*cell_size; | |
83 | pr_debug("Limiting number of entries to %d\n", limit); | |
84 | fdt_setprop(initial_boot_params, memory, "reg", val, | |
85 | len); | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
54c180e7 | 90 | bool of_fdt_device_is_available(const void *blob, unsigned long node) |
ecc8a96e RH |
91 | { |
92 | const char *status = fdt_getprop(blob, node, "status", NULL); | |
93 | ||
94 | if (!status) | |
95 | return true; | |
96 | ||
97 | if (!strcmp(status, "ok") || !strcmp(status, "okay")) | |
98 | return true; | |
99 | ||
100 | return false; | |
101 | } | |
102 | ||
44856819 | 103 | static void *unflatten_dt_alloc(void **mem, unsigned long size, |
bbd33931 GL |
104 | unsigned long align) |
105 | { | |
106 | void *res; | |
107 | ||
44856819 GL |
108 | *mem = PTR_ALIGN(*mem, align); |
109 | res = *mem; | |
bbd33931 GL |
110 | *mem += size; |
111 | ||
112 | return res; | |
113 | } | |
114 | ||
dfbd4c6e GS |
115 | static void populate_properties(const void *blob, |
116 | int offset, | |
117 | void **mem, | |
118 | struct device_node *np, | |
119 | const char *nodename, | |
5063e25a | 120 | bool dryrun) |
bbd33931 | 121 | { |
dfbd4c6e GS |
122 | struct property *pp, **pprev = NULL; |
123 | int cur; | |
124 | bool has_name = false; | |
125 | ||
126 | pprev = &np->properties; | |
127 | for (cur = fdt_first_property_offset(blob, offset); | |
128 | cur >= 0; | |
129 | cur = fdt_next_property_offset(blob, cur)) { | |
130 | const __be32 *val; | |
131 | const char *pname; | |
132 | u32 sz; | |
133 | ||
134 | val = fdt_getprop_by_offset(blob, cur, &pname, &sz); | |
135 | if (!val) { | |
606ad42a | 136 | pr_warn("Cannot locate property at 0x%x\n", cur); |
dfbd4c6e GS |
137 | continue; |
138 | } | |
139 | ||
140 | if (!pname) { | |
606ad42a | 141 | pr_warn("Cannot find property name at 0x%x\n", cur); |
dfbd4c6e GS |
142 | continue; |
143 | } | |
144 | ||
145 | if (!strcmp(pname, "name")) | |
146 | has_name = true; | |
147 | ||
148 | pp = unflatten_dt_alloc(mem, sizeof(struct property), | |
149 | __alignof__(struct property)); | |
150 | if (dryrun) | |
151 | continue; | |
152 | ||
153 | /* We accept flattened tree phandles either in | |
154 | * ePAPR-style "phandle" properties, or the | |
155 | * legacy "linux,phandle" properties. If both | |
156 | * appear and have different values, things | |
157 | * will get weird. Don't do that. | |
158 | */ | |
159 | if (!strcmp(pname, "phandle") || | |
160 | !strcmp(pname, "linux,phandle")) { | |
161 | if (!np->phandle) | |
162 | np->phandle = be32_to_cpup(val); | |
163 | } | |
164 | ||
165 | /* And we process the "ibm,phandle" property | |
166 | * used in pSeries dynamic device tree | |
167 | * stuff | |
168 | */ | |
169 | if (!strcmp(pname, "ibm,phandle")) | |
170 | np->phandle = be32_to_cpup(val); | |
171 | ||
172 | pp->name = (char *)pname; | |
173 | pp->length = sz; | |
174 | pp->value = (__be32 *)val; | |
175 | *pprev = pp; | |
176 | pprev = &pp->next; | |
177 | } | |
178 | ||
179 | /* With version 0x10 we may not have the name property, | |
180 | * recreate it here from the unit name if absent | |
181 | */ | |
182 | if (!has_name) { | |
183 | const char *p = nodename, *ps = p, *pa = NULL; | |
184 | int len; | |
185 | ||
186 | while (*p) { | |
187 | if ((*p) == '@') | |
188 | pa = p; | |
189 | else if ((*p) == '/') | |
190 | ps = p + 1; | |
191 | p++; | |
192 | } | |
193 | ||
194 | if (pa < ps) | |
195 | pa = p; | |
196 | len = (pa - ps) + 1; | |
197 | pp = unflatten_dt_alloc(mem, sizeof(struct property) + len, | |
198 | __alignof__(struct property)); | |
199 | if (!dryrun) { | |
200 | pp->name = "name"; | |
201 | pp->length = len; | |
202 | pp->value = pp + 1; | |
203 | *pprev = pp; | |
dfbd4c6e GS |
204 | memcpy(pp->value, ps, len - 1); |
205 | ((char *)pp->value)[len - 1] = 0; | |
206 | pr_debug("fixed up name for %s -> %s\n", | |
207 | nodename, (char *)pp->value); | |
208 | } | |
209 | } | |
dfbd4c6e GS |
210 | } |
211 | ||
649cab56 | 212 | static int populate_node(const void *blob, |
a7e4cfb0 RH |
213 | int offset, |
214 | void **mem, | |
215 | struct device_node *dad, | |
216 | struct device_node **pnp, | |
217 | bool dryrun) | |
dfbd4c6e | 218 | { |
bbd33931 | 219 | struct device_node *np; |
e6a6928c | 220 | const char *pathp; |
649cab56 | 221 | int len; |
bbd33931 | 222 | |
649cab56 | 223 | pathp = fdt_get_name(blob, offset, &len); |
dfbd4c6e GS |
224 | if (!pathp) { |
225 | *pnp = NULL; | |
649cab56 | 226 | return len; |
dfbd4c6e | 227 | } |
e6a6928c | 228 | |
649cab56 | 229 | len++; |
bbd33931 | 230 | |
649cab56 | 231 | np = unflatten_dt_alloc(mem, sizeof(struct device_node) + len, |
bbd33931 | 232 | __alignof__(struct device_node)); |
5063e25a | 233 | if (!dryrun) { |
c22618a1 | 234 | char *fn; |
0829f6d1 | 235 | of_node_init(np); |
c22618a1 | 236 | np->full_name = fn = ((char *)np) + sizeof(*np); |
a7e4cfb0 | 237 | |
649cab56 | 238 | memcpy(fn, pathp, len); |
c22618a1 | 239 | |
bbd33931 GL |
240 | if (dad != NULL) { |
241 | np->parent = dad; | |
70161ff3 GL |
242 | np->sibling = dad->child; |
243 | dad->child = np; | |
bbd33931 | 244 | } |
bbd33931 | 245 | } |
e6a6928c | 246 | |
dfbd4c6e | 247 | populate_properties(blob, offset, mem, np, pathp, dryrun); |
5063e25a | 248 | if (!dryrun) { |
bbd33931 | 249 | np->name = of_get_property(np, "name", NULL); |
bbd33931 GL |
250 | if (!np->name) |
251 | np->name = "<NULL>"; | |
bbd33931 | 252 | } |
e6a6928c | 253 | |
dfbd4c6e | 254 | *pnp = np; |
7913145a | 255 | return 0; |
dfbd4c6e GS |
256 | } |
257 | ||
50800082 GS |
258 | static void reverse_nodes(struct device_node *parent) |
259 | { | |
260 | struct device_node *child, *next; | |
261 | ||
262 | /* In-depth first */ | |
263 | child = parent->child; | |
264 | while (child) { | |
265 | reverse_nodes(child); | |
266 | ||
267 | child = child->sibling; | |
268 | } | |
269 | ||
270 | /* Reverse the nodes in the child list */ | |
271 | child = parent->child; | |
272 | parent->child = NULL; | |
273 | while (child) { | |
274 | next = child->sibling; | |
275 | ||
276 | child->sibling = parent->child; | |
277 | parent->child = child; | |
278 | child = next; | |
279 | } | |
280 | } | |
281 | ||
dfbd4c6e | 282 | /** |
947c82cb | 283 | * unflatten_dt_nodes - Alloc and populate a device_node from the flat tree |
dfbd4c6e GS |
284 | * @blob: The parent device tree blob |
285 | * @mem: Memory chunk to use for allocating device nodes and properties | |
dfbd4c6e GS |
286 | * @dad: Parent struct device_node |
287 | * @nodepp: The device_node tree created by the call | |
50800082 | 288 | * |
8c8239c2 | 289 | * Return: The size of unflattened device tree or error code |
dfbd4c6e | 290 | */ |
947c82cb GS |
291 | static int unflatten_dt_nodes(const void *blob, |
292 | void *mem, | |
293 | struct device_node *dad, | |
294 | struct device_node **nodepp) | |
dfbd4c6e | 295 | { |
50800082 | 296 | struct device_node *root; |
8c237cd0 | 297 | int offset = 0, depth = 0, initial_depth = 0; |
50800082 | 298 | #define FDT_MAX_DEPTH 64 |
50800082 GS |
299 | struct device_node *nps[FDT_MAX_DEPTH]; |
300 | void *base = mem; | |
301 | bool dryrun = !base; | |
649cab56 | 302 | int ret; |
dfbd4c6e | 303 | |
50800082 GS |
304 | if (nodepp) |
305 | *nodepp = NULL; | |
306 | ||
8c237cd0 GS |
307 | /* |
308 | * We're unflattening device sub-tree if @dad is valid. There are | |
309 | * possibly multiple nodes in the first level of depth. We need | |
310 | * set @depth to 1 to make fdt_next_node() happy as it bails | |
311 | * immediately when negative @depth is found. Otherwise, the device | |
312 | * nodes except the first one won't be unflattened successfully. | |
313 | */ | |
314 | if (dad) | |
315 | depth = initial_depth = 1; | |
316 | ||
50800082 | 317 | root = dad; |
78c44d91 | 318 | nps[depth] = dad; |
8c237cd0 | 319 | |
50800082 | 320 | for (offset = 0; |
8c237cd0 | 321 | offset >= 0 && depth >= initial_depth; |
50800082 | 322 | offset = fdt_next_node(blob, offset, &depth)) { |
2f945a79 | 323 | if (WARN_ON_ONCE(depth >= FDT_MAX_DEPTH - 1)) |
50800082 | 324 | continue; |
dfbd4c6e | 325 | |
77ea8a68 RH |
326 | if (!IS_ENABLED(CONFIG_OF_KOBJ) && |
327 | !of_fdt_device_is_available(blob, offset)) | |
328 | continue; | |
329 | ||
649cab56 FR |
330 | ret = populate_node(blob, offset, &mem, nps[depth], |
331 | &nps[depth+1], dryrun); | |
332 | if (ret < 0) | |
333 | return ret; | |
50800082 GS |
334 | |
335 | if (!dryrun && nodepp && !*nodepp) | |
78c44d91 | 336 | *nodepp = nps[depth+1]; |
50800082 | 337 | if (!dryrun && !root) |
78c44d91 | 338 | root = nps[depth+1]; |
50800082 | 339 | } |
e6a6928c | 340 | |
50800082 | 341 | if (offset < 0 && offset != -FDT_ERR_NOTFOUND) { |
606ad42a | 342 | pr_err("Error %d processing FDT\n", offset); |
50800082 GS |
343 | return -EINVAL; |
344 | } | |
e6a6928c | 345 | |
70161ff3 GL |
346 | /* |
347 | * Reverse the child list. Some drivers assumes node order matches .dts | |
348 | * node order | |
349 | */ | |
50800082 GS |
350 | if (!dryrun) |
351 | reverse_nodes(root); | |
e6a6928c | 352 | |
50800082 | 353 | return mem - base; |
bbd33931 | 354 | } |
41f88009 | 355 | |
fe140423 SN |
356 | /** |
357 | * __unflatten_device_tree - create tree of device_nodes from flat blob | |
fe140423 | 358 | * @blob: The blob to expand |
c4263233 | 359 | * @dad: Parent device node |
fe140423 SN |
360 | * @mynodes: The device_node tree created by the call |
361 | * @dt_alloc: An allocator that provides a virtual address to memory | |
362 | * for the resulting tree | |
f5d2da67 | 363 | * @detached: if true set OF_DETACHED on @mynodes |
83262418 | 364 | * |
62f026f0 RH |
365 | * unflattens a device-tree, creating the tree of struct device_node. It also |
366 | * fills the "name" and "type" pointers of the nodes so the normal device-tree | |
367 | * walking functions can be used. | |
368 | * | |
8c8239c2 | 369 | * Return: NULL on failure or the memory chunk containing the unflattened |
83262418 | 370 | * device tree on success. |
fe140423 | 371 | */ |
81d0848f FR |
372 | void *__unflatten_device_tree(const void *blob, |
373 | struct device_node *dad, | |
374 | struct device_node **mynodes, | |
375 | void *(*dt_alloc)(u64 size, u64 align), | |
376 | bool detached) | |
fe140423 | 377 | { |
50800082 | 378 | int size; |
e6a6928c | 379 | void *mem; |
649cab56 FR |
380 | int ret; |
381 | ||
382 | if (mynodes) | |
383 | *mynodes = NULL; | |
fe140423 SN |
384 | |
385 | pr_debug(" -> unflatten_device_tree()\n"); | |
386 | ||
387 | if (!blob) { | |
388 | pr_debug("No device tree pointer\n"); | |
83262418 | 389 | return NULL; |
fe140423 SN |
390 | } |
391 | ||
392 | pr_debug("Unflattening device tree:\n"); | |
c972de14 RH |
393 | pr_debug("magic: %08x\n", fdt_magic(blob)); |
394 | pr_debug("size: %08x\n", fdt_totalsize(blob)); | |
395 | pr_debug("version: %08x\n", fdt_version(blob)); | |
fe140423 | 396 | |
c972de14 | 397 | if (fdt_check_header(blob)) { |
fe140423 | 398 | pr_err("Invalid device tree blob header\n"); |
83262418 | 399 | return NULL; |
fe140423 SN |
400 | } |
401 | ||
402 | /* First pass, scan for size */ | |
c4263233 | 403 | size = unflatten_dt_nodes(blob, NULL, dad, NULL); |
649cab56 | 404 | if (size <= 0) |
83262418 | 405 | return NULL; |
fe140423 | 406 | |
50800082 GS |
407 | size = ALIGN(size, 4); |
408 | pr_debug(" size is %d, allocating...\n", size); | |
fe140423 SN |
409 | |
410 | /* Allocate memory for the expanded device tree */ | |
44856819 | 411 | mem = dt_alloc(size + 4, __alignof__(struct device_node)); |
49e67dd1 JH |
412 | if (!mem) |
413 | return NULL; | |
414 | ||
44856819 | 415 | memset(mem, 0, size); |
fe140423 | 416 | |
44856819 | 417 | *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); |
9e401275 | 418 | |
44856819 | 419 | pr_debug(" unflattening %p...\n", mem); |
fe140423 SN |
420 | |
421 | /* Second pass, do actual unflattening */ | |
649cab56 FR |
422 | ret = unflatten_dt_nodes(blob, mem, dad, mynodes); |
423 | ||
44856819 | 424 | if (be32_to_cpup(mem + size) != 0xdeadbeef) |
e2f04da7 KW |
425 | pr_warn("End of tree marker overwritten: %08x\n", |
426 | be32_to_cpup(mem + size)); | |
fe140423 | 427 | |
649cab56 FR |
428 | if (ret <= 0) |
429 | return NULL; | |
430 | ||
431 | if (detached && mynodes && *mynodes) { | |
1d1bde55 MS |
432 | of_node_set_flag(*mynodes, OF_DETACHED); |
433 | pr_debug("unflattened tree is detached\n"); | |
434 | } | |
435 | ||
fe140423 | 436 | pr_debug(" <- unflatten_device_tree()\n"); |
83262418 | 437 | return mem; |
fe140423 SN |
438 | } |
439 | ||
440 | static void *kernel_tree_alloc(u64 size, u64 align) | |
441 | { | |
442 | return kzalloc(size, GFP_KERNEL); | |
443 | } | |
444 | ||
f8062386 GR |
445 | static DEFINE_MUTEX(of_fdt_unflatten_mutex); |
446 | ||
fe140423 SN |
447 | /** |
448 | * of_fdt_unflatten_tree - create tree of device_nodes from flat blob | |
c4263233 GS |
449 | * @blob: Flat device tree blob |
450 | * @dad: Parent device node | |
451 | * @mynodes: The device tree created by the call | |
fe140423 SN |
452 | * |
453 | * unflattens the device-tree passed by the firmware, creating the | |
454 | * tree of struct device_node. It also fills the "name" and "type" | |
455 | * pointers of the nodes so the normal device-tree walking functions | |
456 | * can be used. | |
83262418 | 457 | * |
8c8239c2 | 458 | * Return: NULL on failure or the memory chunk containing the unflattened |
83262418 | 459 | * device tree on success. |
fe140423 | 460 | */ |
83262418 GS |
461 | void *of_fdt_unflatten_tree(const unsigned long *blob, |
462 | struct device_node *dad, | |
463 | struct device_node **mynodes) | |
fe140423 | 464 | { |
83262418 GS |
465 | void *mem; |
466 | ||
f8062386 | 467 | mutex_lock(&of_fdt_unflatten_mutex); |
1d1bde55 MS |
468 | mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc, |
469 | true); | |
f8062386 | 470 | mutex_unlock(&of_fdt_unflatten_mutex); |
83262418 GS |
471 | |
472 | return mem; | |
fe140423 SN |
473 | } |
474 | EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); | |
475 | ||
57d00ecf SN |
476 | /* Everything below here references initial_boot_params directly. */ |
477 | int __initdata dt_root_addr_cells; | |
478 | int __initdata dt_root_size_cells; | |
479 | ||
7c71650f | 480 | void *initial_boot_params __ro_after_init; |
57d00ecf SN |
481 | |
482 | #ifdef CONFIG_OF_EARLY_FLATTREE | |
483 | ||
08d53aa5 AB |
484 | static u32 of_fdt_crc32; |
485 | ||
f7e7ce93 | 486 | /* |
2fcf9a17 | 487 | * fdt_reserve_elfcorehdr() - reserves memory for elf core header |
f7e7ce93 GU |
488 | * |
489 | * This function reserves the memory occupied by an elf core header | |
490 | * described in the device tree. This region contains all the | |
491 | * information about primary kernel's core image and is used by a dump | |
492 | * capture kernel to access the system memory on primary kernel. | |
493 | */ | |
2fcf9a17 | 494 | static void __init fdt_reserve_elfcorehdr(void) |
f7e7ce93 GU |
495 | { |
496 | if (!IS_ENABLED(CONFIG_CRASH_DUMP) || !elfcorehdr_size) | |
497 | return; | |
498 | ||
499 | if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) { | |
500 | pr_warn("elfcorehdr is overlapped\n"); | |
501 | return; | |
502 | } | |
503 | ||
504 | memblock_reserve(elfcorehdr_addr, elfcorehdr_size); | |
505 | ||
506 | pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n", | |
507 | elfcorehdr_size >> 10, elfcorehdr_addr); | |
508 | } | |
509 | ||
e8d9d1f5 MS |
510 | /** |
511 | * early_init_fdt_scan_reserved_mem() - create reserved memory regions | |
512 | * | |
513 | * This function grabs memory from early allocator for device exclusive use | |
514 | * defined in device tree structures. It should be called by arch specific code | |
515 | * once the early allocator (i.e. memblock) has been fully activated. | |
516 | */ | |
517 | void __init early_init_fdt_scan_reserved_mem(void) | |
518 | { | |
d1552ce4 RH |
519 | int n; |
520 | u64 base, size; | |
521 | ||
2040b527 JC |
522 | if (!initial_boot_params) |
523 | return; | |
524 | ||
b4132818 LT |
525 | fdt_scan_reserved_mem(); |
526 | fdt_reserve_elfcorehdr(); | |
527 | ||
d1552ce4 RH |
528 | /* Process header /memreserve/ fields */ |
529 | for (n = 0; ; n++) { | |
530 | fdt_get_mem_rsv(initial_boot_params, n, &base, &size); | |
531 | if (!size) | |
532 | break; | |
f8a855ed | 533 | memblock_reserve(base, size); |
d1552ce4 RH |
534 | } |
535 | ||
132507ed | 536 | fdt_init_reserved_mem(); |
e8d9d1f5 MS |
537 | } |
538 | ||
24bbd929 AB |
539 | /** |
540 | * early_init_fdt_reserve_self() - reserve the memory used by the FDT blob | |
541 | */ | |
542 | void __init early_init_fdt_reserve_self(void) | |
543 | { | |
544 | if (!initial_boot_params) | |
545 | return; | |
546 | ||
547 | /* Reserve the dtb region */ | |
f8a855ed PC |
548 | memblock_reserve(__pa(initial_boot_params), |
549 | fdt_totalsize(initial_boot_params)); | |
24bbd929 AB |
550 | } |
551 | ||
57d00ecf SN |
552 | /** |
553 | * of_scan_flat_dt - scan flattened tree blob and call callback on each. | |
554 | * @it: callback function | |
555 | * @data: context data pointer | |
556 | * | |
557 | * This function is used to scan the flattened device-tree, it is | |
558 | * used to extract the memory information at boot before we can | |
559 | * unflatten the tree | |
560 | */ | |
561 | int __init of_scan_flat_dt(int (*it)(unsigned long node, | |
562 | const char *uname, int depth, | |
563 | void *data), | |
564 | void *data) | |
565 | { | |
e6a6928c RH |
566 | const void *blob = initial_boot_params; |
567 | const char *pathp; | |
568 | int offset, rc = 0, depth = -1; | |
569 | ||
3ec75441 TW |
570 | if (!blob) |
571 | return 0; | |
572 | ||
573 | for (offset = fdt_next_node(blob, -1, &depth); | |
574 | offset >= 0 && depth >= 0 && !rc; | |
575 | offset = fdt_next_node(blob, offset, &depth)) { | |
e6a6928c RH |
576 | |
577 | pathp = fdt_get_name(blob, offset, NULL); | |
e6a6928c RH |
578 | rc = it(offset, pathp, depth, data); |
579 | } | |
57d00ecf SN |
580 | return rc; |
581 | } | |
582 | ||
ea47dd19 NP |
583 | /** |
584 | * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each. | |
a300dc86 | 585 | * @parent: parent node |
ea47dd19 NP |
586 | * @it: callback function |
587 | * @data: context data pointer | |
588 | * | |
589 | * This function is used to scan sub-nodes of a node. | |
590 | */ | |
591 | int __init of_scan_flat_dt_subnodes(unsigned long parent, | |
592 | int (*it)(unsigned long node, | |
593 | const char *uname, | |
594 | void *data), | |
595 | void *data) | |
596 | { | |
597 | const void *blob = initial_boot_params; | |
598 | int node; | |
599 | ||
600 | fdt_for_each_subnode(node, blob, parent) { | |
601 | const char *pathp; | |
602 | int rc; | |
603 | ||
604 | pathp = fdt_get_name(blob, node, NULL); | |
ea47dd19 NP |
605 | rc = it(node, pathp, data); |
606 | if (rc) | |
607 | return rc; | |
608 | } | |
609 | return 0; | |
610 | } | |
611 | ||
9c609868 SZ |
612 | /** |
613 | * of_get_flat_dt_subnode_by_name - get the subnode by given name | |
614 | * | |
615 | * @node: the parent node | |
616 | * @uname: the name of subnode | |
617 | * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none | |
618 | */ | |
619 | ||
9b4d2b63 | 620 | int __init of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) |
9c609868 SZ |
621 | { |
622 | return fdt_subnode_offset(initial_boot_params, node, uname); | |
623 | } | |
624 | ||
a300dc86 | 625 | /* |
57d00ecf SN |
626 | * of_get_flat_dt_root - find the root node in the flat blob |
627 | */ | |
628 | unsigned long __init of_get_flat_dt_root(void) | |
629 | { | |
e6a6928c | 630 | return 0; |
57d00ecf SN |
631 | } |
632 | ||
a300dc86 | 633 | /* |
57d00ecf SN |
634 | * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr |
635 | * | |
636 | * This function can be used within scan_flattened_dt callback to get | |
637 | * access to properties | |
638 | */ | |
9d0c4dfe RH |
639 | const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
640 | int *size) | |
57d00ecf | 641 | { |
e6a6928c | 642 | return fdt_getprop(initial_boot_params, node, name, size); |
57d00ecf SN |
643 | } |
644 | ||
5d9c4e95 KW |
645 | /** |
646 | * of_fdt_is_compatible - Return true if given node from the given blob has | |
647 | * compat in its compatible list | |
648 | * @blob: A device tree blob | |
649 | * @node: node to test | |
650 | * @compat: compatible string to compare with compatible list. | |
651 | * | |
8c8239c2 | 652 | * Return: a non-zero value on match with smaller values returned for more |
5d9c4e95 KW |
653 | * specific compatible values. |
654 | */ | |
655 | static int of_fdt_is_compatible(const void *blob, | |
656 | unsigned long node, const char *compat) | |
657 | { | |
658 | const char *cp; | |
659 | int cplen; | |
660 | unsigned long l, score = 0; | |
661 | ||
662 | cp = fdt_getprop(blob, node, "compatible", &cplen); | |
663 | if (cp == NULL) | |
664 | return 0; | |
665 | while (cplen > 0) { | |
666 | score++; | |
667 | if (of_compat_cmp(cp, compat, strlen(compat)) == 0) | |
668 | return score; | |
669 | l = strlen(cp) + 1; | |
670 | cp += l; | |
671 | cplen -= l; | |
672 | } | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
57d00ecf SN |
677 | /** |
678 | * of_flat_dt_is_compatible - Return true if given node has compat in compatible list | |
679 | * @node: node to test | |
680 | * @compat: compatible string to compare with compatible list. | |
681 | */ | |
682 | int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) | |
683 | { | |
684 | return of_fdt_is_compatible(initial_boot_params, node, compat); | |
685 | } | |
686 | ||
a300dc86 | 687 | /* |
a4f740cf GL |
688 | * of_flat_dt_match - Return true if node matches a list of compatible values |
689 | */ | |
9b4d2b63 | 690 | static int __init of_flat_dt_match(unsigned long node, const char *const *compat) |
a4f740cf | 691 | { |
5d9c4e95 KW |
692 | unsigned int tmp, score = 0; |
693 | ||
694 | if (!compat) | |
695 | return 0; | |
696 | ||
697 | while (*compat) { | |
698 | tmp = of_fdt_is_compatible(initial_boot_params, node, *compat); | |
699 | if (tmp && (score == 0 || (tmp < score))) | |
700 | score = tmp; | |
701 | compat++; | |
702 | } | |
703 | ||
704 | return score; | |
a4f740cf GL |
705 | } |
706 | ||
a300dc86 LJ |
707 | /* |
708 | * of_get_flat_dt_phandle - Given a node in the flat blob, return the phandle | |
ea47dd19 NP |
709 | */ |
710 | uint32_t __init of_get_flat_dt_phandle(unsigned long node) | |
711 | { | |
712 | return fdt_get_phandle(initial_boot_params, node); | |
713 | } | |
714 | ||
6a903a25 RH |
715 | const char * __init of_flat_dt_get_machine_name(void) |
716 | { | |
717 | const char *name; | |
718 | unsigned long dt_root = of_get_flat_dt_root(); | |
719 | ||
720 | name = of_get_flat_dt_prop(dt_root, "model", NULL); | |
721 | if (!name) | |
722 | name = of_get_flat_dt_prop(dt_root, "compatible", NULL); | |
723 | return name; | |
724 | } | |
725 | ||
726 | /** | |
727 | * of_flat_dt_match_machine - Iterate match tables to find matching machine. | |
728 | * | |
729 | * @default_match: A machine specific ptr to return in case of no match. | |
730 | * @get_next_compat: callback function to return next compatible match table. | |
731 | * | |
732 | * Iterate through machine match tables to find the best match for the machine | |
733 | * compatible string in the FDT. | |
734 | */ | |
735 | const void * __init of_flat_dt_match_machine(const void *default_match, | |
736 | const void * (*get_next_compat)(const char * const**)) | |
737 | { | |
738 | const void *data = NULL; | |
739 | const void *best_data = default_match; | |
740 | const char *const *compat; | |
741 | unsigned long dt_root; | |
742 | unsigned int best_score = ~1, score = 0; | |
743 | ||
744 | dt_root = of_get_flat_dt_root(); | |
745 | while ((data = get_next_compat(&compat))) { | |
746 | score = of_flat_dt_match(dt_root, compat); | |
747 | if (score > 0 && score < best_score) { | |
748 | best_data = data; | |
749 | best_score = score; | |
750 | } | |
751 | } | |
752 | if (!best_data) { | |
753 | const char *prop; | |
9d0c4dfe | 754 | int size; |
6a903a25 RH |
755 | |
756 | pr_err("\n unrecognized device tree list:\n[ "); | |
757 | ||
758 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
759 | if (prop) { | |
760 | while (size > 0) { | |
761 | printk("'%s' ", prop); | |
762 | size -= strlen(prop) + 1; | |
763 | prop += strlen(prop) + 1; | |
764 | } | |
765 | } | |
766 | printk("]\n\n"); | |
767 | return NULL; | |
768 | } | |
769 | ||
770 | pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); | |
771 | ||
772 | return best_data; | |
773 | } | |
774 | ||
369bc9ab AB |
775 | static void __early_init_dt_declare_initrd(unsigned long start, |
776 | unsigned long end) | |
777 | { | |
3335068f AG |
778 | /* |
779 | * __va() is not yet available this early on some platforms. In that | |
780 | * case, the platform uses phys_initrd_start/phys_initrd_size instead | |
781 | * and does the VA conversion itself. | |
cdbc848b | 782 | */ |
3335068f AG |
783 | if (!IS_ENABLED(CONFIG_ARM64) && |
784 | !(IS_ENABLED(CONFIG_RISCV) && IS_ENABLED(CONFIG_64BIT))) { | |
cdbc848b FF |
785 | initrd_start = (unsigned long)__va(start); |
786 | initrd_end = (unsigned long)__va(end); | |
787 | initrd_below_start_ok = 1; | |
788 | } | |
369bc9ab | 789 | } |
369bc9ab | 790 | |
f7b3a835 GL |
791 | /** |
792 | * early_init_dt_check_for_initrd - Decode initrd location from flat tree | |
793 | * @node: reference to node containing initrd location ('chosen') | |
794 | */ | |
29eb45a9 | 795 | static void __init early_init_dt_check_for_initrd(unsigned long node) |
f7b3a835 | 796 | { |
374d5c99 | 797 | u64 start, end; |
9d0c4dfe RH |
798 | int len; |
799 | const __be32 *prop; | |
f7b3a835 | 800 | |
bf2e8609 GU |
801 | if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD)) |
802 | return; | |
803 | ||
f7b3a835 GL |
804 | pr_debug("Looking for initrd properties... "); |
805 | ||
806 | prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); | |
1406bc2f JK |
807 | if (!prop) |
808 | return; | |
374d5c99 | 809 | start = of_read_number(prop, len/4); |
1406bc2f JK |
810 | |
811 | prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); | |
812 | if (!prop) | |
813 | return; | |
374d5c99 | 814 | end = of_read_number(prop, len/4); |
d5e3050c MB |
815 | if (start > end) |
816 | return; | |
f7b3a835 | 817 | |
369bc9ab | 818 | __early_init_dt_declare_initrd(start, end); |
fe7db757 FF |
819 | phys_initrd_start = start; |
820 | phys_initrd_size = end - start; | |
29eb45a9 | 821 | |
0e407a9a | 822 | pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", start, end); |
f7b3a835 | 823 | } |
f7b3a835 | 824 | |
f7e7ce93 GU |
825 | /** |
826 | * early_init_dt_check_for_elfcorehdr - Decode elfcorehdr location from flat | |
827 | * tree | |
828 | * @node: reference to node containing elfcorehdr location ('chosen') | |
829 | */ | |
830 | static void __init early_init_dt_check_for_elfcorehdr(unsigned long node) | |
831 | { | |
832 | const __be32 *prop; | |
833 | int len; | |
834 | ||
835 | if (!IS_ENABLED(CONFIG_CRASH_DUMP)) | |
836 | return; | |
837 | ||
838 | pr_debug("Looking for elfcorehdr property... "); | |
839 | ||
840 | prop = of_get_flat_dt_prop(node, "linux,elfcorehdr", &len); | |
841 | if (!prop || (len < (dt_root_addr_cells + dt_root_size_cells))) | |
842 | return; | |
843 | ||
844 | elfcorehdr_addr = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
845 | elfcorehdr_size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
846 | ||
847 | pr_debug("elfcorehdr_start=0x%llx elfcorehdr_size=0x%llx\n", | |
848 | elfcorehdr_addr, elfcorehdr_size); | |
849 | } | |
850 | ||
8347b417 | 851 | static unsigned long chosen_node_offset = -FDT_ERR_NOTFOUND; |
2af2b50a | 852 | |
fb319e77 CZ |
853 | /* |
854 | * The main usage of linux,usable-memory-range is for crash dump kernel. | |
855 | * Originally, the number of usable-memory regions is one. Now there may | |
856 | * be two regions, low region and high region. | |
857 | * To make compatibility with existing user-space and older kdump, the low | |
858 | * region is always the last range of linux,usable-memory-range if exist. | |
859 | */ | |
860 | #define MAX_USABLE_RANGES 2 | |
861 | ||
2af2b50a GU |
862 | /** |
863 | * early_init_dt_check_for_usable_mem_range - Decode usable memory range | |
864 | * location from flat tree | |
2af2b50a | 865 | */ |
b398123b | 866 | void __init early_init_dt_check_for_usable_mem_range(void) |
2af2b50a | 867 | { |
fb319e77 CZ |
868 | struct memblock_region rgn[MAX_USABLE_RANGES] = {0}; |
869 | const __be32 *prop, *endp; | |
870 | int len, i; | |
8347b417 ZL |
871 | unsigned long node = chosen_node_offset; |
872 | ||
873 | if ((long)node < 0) | |
874 | return; | |
2af2b50a GU |
875 | |
876 | pr_debug("Looking for usable-memory-range property... "); | |
877 | ||
878 | prop = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len); | |
fb319e77 | 879 | if (!prop || (len % (dt_root_addr_cells + dt_root_size_cells))) |
2af2b50a GU |
880 | return; |
881 | ||
fb319e77 CZ |
882 | endp = prop + (len / sizeof(__be32)); |
883 | for (i = 0; i < MAX_USABLE_RANGES && prop < endp; i++) { | |
884 | rgn[i].base = dt_mem_next_cell(dt_root_addr_cells, &prop); | |
885 | rgn[i].size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
2af2b50a | 886 | |
fb319e77 CZ |
887 | pr_debug("cap_mem_regions[%d]: base=%pa, size=%pa\n", |
888 | i, &rgn[i].base, &rgn[i].size); | |
889 | } | |
8347b417 | 890 | |
fb319e77 CZ |
891 | memblock_cap_memory_range(rgn[0].base, rgn[0].size); |
892 | for (i = 1; i < MAX_USABLE_RANGES && rgn[i].size; i++) | |
893 | memblock_add(rgn[i].base, rgn[i].size); | |
2af2b50a GU |
894 | } |
895 | ||
fb11ffe7 | 896 | #ifdef CONFIG_SERIAL_EARLYCON |
fb11ffe7 | 897 | |
d503187b | 898 | int __init early_init_dt_scan_chosen_stdout(void) |
fb11ffe7 RH |
899 | { |
900 | int offset; | |
4d118c9a | 901 | const char *p, *q, *options = NULL; |
fb11ffe7 | 902 | int l; |
62dcd9c5 | 903 | const struct earlycon_id *match; |
fb11ffe7 | 904 | const void *fdt = initial_boot_params; |
65e20e8c | 905 | int ret; |
fb11ffe7 RH |
906 | |
907 | offset = fdt_path_offset(fdt, "/chosen"); | |
908 | if (offset < 0) | |
909 | offset = fdt_path_offset(fdt, "/chosen@0"); | |
910 | if (offset < 0) | |
911 | return -ENOENT; | |
912 | ||
913 | p = fdt_getprop(fdt, offset, "stdout-path", &l); | |
914 | if (!p) | |
915 | p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); | |
916 | if (!p || !l) | |
917 | return -ENOENT; | |
918 | ||
4d118c9a PH |
919 | q = strchrnul(p, ':'); |
920 | if (*q != '\0') | |
921 | options = q + 1; | |
0fcc286f | 922 | l = q - p; |
6296ad9e | 923 | |
fb11ffe7 | 924 | /* Get the node specified by stdout-path */ |
0fcc286f PH |
925 | offset = fdt_path_offset_namelen(fdt, p, l); |
926 | if (offset < 0) { | |
927 | pr_warn("earlycon: stdout-path %.*s not found\n", l, p); | |
928 | return 0; | |
929 | } | |
fb11ffe7 | 930 | |
62dcd9c5 | 931 | for (match = __earlycon_table; match < __earlycon_table_end; match++) { |
2eaa7909 PH |
932 | if (!match->compatible[0]) |
933 | continue; | |
934 | ||
935 | if (fdt_node_check_compatible(fdt, offset, match->compatible)) | |
fb11ffe7 | 936 | continue; |
fb11ffe7 | 937 | |
65e20e8c MW |
938 | ret = of_setup_earlycon(match, offset, options); |
939 | if (!ret || ret == -EALREADY) | |
b2047316 | 940 | return 0; |
fb11ffe7 RH |
941 | } |
942 | return -ENODEV; | |
943 | } | |
fb11ffe7 RH |
944 | #endif |
945 | ||
a300dc86 | 946 | /* |
f00abd94 GL |
947 | * early_init_dt_scan_root - fetch the top level address and size cells |
948 | */ | |
d665881d | 949 | int __init early_init_dt_scan_root(void) |
f00abd94 | 950 | { |
9d0c4dfe | 951 | const __be32 *prop; |
d665881d RH |
952 | const void *fdt = initial_boot_params; |
953 | int node = fdt_path_offset(fdt, "/"); | |
f00abd94 | 954 | |
d665881d RH |
955 | if (node < 0) |
956 | return -ENODEV; | |
f00abd94 | 957 | |
33714881 JK |
958 | dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; |
959 | dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; | |
960 | ||
f00abd94 | 961 | prop = of_get_flat_dt_prop(node, "#size-cells", NULL); |
33714881 JK |
962 | if (prop) |
963 | dt_root_size_cells = be32_to_cpup(prop); | |
f00abd94 GL |
964 | pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); |
965 | ||
966 | prop = of_get_flat_dt_prop(node, "#address-cells", NULL); | |
33714881 JK |
967 | if (prop) |
968 | dt_root_addr_cells = be32_to_cpup(prop); | |
f00abd94 GL |
969 | pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); |
970 | ||
d665881d | 971 | return 0; |
f00abd94 GL |
972 | } |
973 | ||
9d0c4dfe | 974 | u64 __init dt_mem_next_cell(int s, const __be32 **cellp) |
83f7a06e | 975 | { |
9d0c4dfe | 976 | const __be32 *p = *cellp; |
83f7a06e GL |
977 | |
978 | *cellp = p + s; | |
979 | return of_read_number(p, s); | |
980 | } | |
981 | ||
a300dc86 | 982 | /* |
0ef5adca | 983 | * early_init_dt_scan_memory - Look for and parse memory nodes |
51975db0 | 984 | */ |
1f012283 | 985 | int __init early_init_dt_scan_memory(void) |
51975db0 | 986 | { |
2a12187d | 987 | int node, found_memory = 0; |
1f012283 | 988 | const void *fdt = initial_boot_params; |
51975db0 | 989 | |
1f012283 RH |
990 | fdt_for_each_subnode(node, fdt, 0) { |
991 | const char *type = of_get_flat_dt_prop(node, "device_type", NULL); | |
992 | const __be32 *reg, *endp; | |
993 | int l; | |
994 | bool hotpluggable; | |
51975db0 | 995 | |
1f012283 RH |
996 | /* We are scanning "memory" nodes only */ |
997 | if (type == NULL || strcmp(type, "memory") != 0) | |
998 | continue; | |
51975db0 | 999 | |
df5cd369 AP |
1000 | if (!of_fdt_device_is_available(fdt, node)) |
1001 | continue; | |
1002 | ||
1f012283 RH |
1003 | reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); |
1004 | if (reg == NULL) | |
1005 | reg = of_get_flat_dt_prop(node, "reg", &l); | |
1006 | if (reg == NULL) | |
1007 | continue; | |
51975db0 | 1008 | |
1f012283 RH |
1009 | endp = reg + (l / sizeof(__be32)); |
1010 | hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL); | |
51975db0 | 1011 | |
1f012283 RH |
1012 | pr_debug("memory scan node %s, reg size %d,\n", |
1013 | fdt_get_name(fdt, node, NULL), l); | |
51975db0 | 1014 | |
1f012283 RH |
1015 | while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { |
1016 | u64 base, size; | |
51975db0 | 1017 | |
1f012283 RH |
1018 | base = dt_mem_next_cell(dt_root_addr_cells, ®); |
1019 | size = dt_mem_next_cell(dt_root_size_cells, ®); | |
51975db0 | 1020 | |
1f012283 RH |
1021 | if (size == 0) |
1022 | continue; | |
1023 | pr_debug(" - %llx, %llx\n", base, size); | |
41a9ada3 | 1024 | |
1f012283 | 1025 | early_init_dt_add_memory_arch(base, size); |
41a9ada3 | 1026 | |
2a12187d AR |
1027 | found_memory = 1; |
1028 | ||
1f012283 RH |
1029 | if (!hotpluggable) |
1030 | continue; | |
51975db0 | 1031 | |
1f012283 RH |
1032 | if (memblock_mark_hotplug(base, size)) |
1033 | pr_warn("failed to mark hotplug range 0x%llx - 0x%llx\n", | |
1034 | base, base + size); | |
1035 | } | |
1036 | } | |
2a12187d | 1037 | return found_memory; |
51975db0 GL |
1038 | } |
1039 | ||
60f20d84 | 1040 | int __init early_init_dt_scan_chosen(char *cmdline) |
86e03221 | 1041 | { |
60f20d84 | 1042 | int l, node; |
9d0c4dfe | 1043 | const char *p; |
428826f5 | 1044 | const void *rng_seed; |
60f20d84 | 1045 | const void *fdt = initial_boot_params; |
86e03221 | 1046 | |
60f20d84 RH |
1047 | node = fdt_path_offset(fdt, "/chosen"); |
1048 | if (node < 0) | |
1049 | node = fdt_path_offset(fdt, "/chosen@0"); | |
1050 | if (node < 0) | |
064e32dc RH |
1051 | /* Handle the cmdline config options even if no /chosen node */ |
1052 | goto handle_cmdline; | |
86e03221 | 1053 | |
8347b417 ZL |
1054 | chosen_node_offset = node; |
1055 | ||
86e03221 | 1056 | early_init_dt_check_for_initrd(node); |
f7e7ce93 | 1057 | early_init_dt_check_for_elfcorehdr(node); |
86e03221 | 1058 | |
064e32dc RH |
1059 | rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l); |
1060 | if (rng_seed && l > 0) { | |
1061 | add_bootloader_randomness(rng_seed, l); | |
1062 | ||
1063 | /* try to clear seed so it won't be found. */ | |
1064 | fdt_nop_property(initial_boot_params, node, "rng-seed"); | |
1065 | ||
1066 | /* update CRC check value */ | |
1067 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, | |
1068 | fdt_totalsize(initial_boot_params)); | |
1069 | } | |
1070 | ||
25985edc | 1071 | /* Retrieve command line */ |
86e03221 GL |
1072 | p = of_get_flat_dt_prop(node, "bootargs", &l); |
1073 | if (p != NULL && l > 0) | |
7a12dd07 | 1074 | strscpy(cmdline, p, min(l, COMMAND_LINE_SIZE)); |
86e03221 | 1075 | |
064e32dc | 1076 | handle_cmdline: |
bd0ddcfc RH |
1077 | /* |
1078 | * CONFIG_CMDLINE is meant to be a default in case nothing else | |
1079 | * managed to set the command line, unless CONFIG_CMDLINE_FORCE | |
1080 | * is set in which case we override whatever was found earlier. | |
1081 | */ | |
1082 | #ifdef CONFIG_CMDLINE | |
1083 | #if defined(CONFIG_CMDLINE_EXTEND) | |
1084 | strlcat(cmdline, " ", COMMAND_LINE_SIZE); | |
1085 | strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1086 | #elif defined(CONFIG_CMDLINE_FORCE) | |
1087 | strscpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1088 | #else | |
1089 | /* No arguments from boot loader, use kernel's cmdl*/ | |
1090 | if (!((char *)cmdline)[0]) | |
1091 | strscpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE); | |
1092 | #endif | |
1093 | #endif /* CONFIG_CMDLINE */ | |
1094 | ||
1095 | pr_debug("Command line is: %s\n", (char *)cmdline); | |
1096 | ||
60f20d84 | 1097 | return 0; |
86e03221 GL |
1098 | } |
1099 | ||
270522a0 AB |
1100 | #ifndef MIN_MEMBLOCK_ADDR |
1101 | #define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET) | |
1102 | #endif | |
8eafeb48 AB |
1103 | #ifndef MAX_MEMBLOCK_ADDR |
1104 | #define MAX_MEMBLOCK_ADDR ((phys_addr_t)~0) | |
1105 | #endif | |
3069f0c0 | 1106 | |
068f6310 RH |
1107 | void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) |
1108 | { | |
270522a0 | 1109 | const u64 phys_offset = MIN_MEMBLOCK_ADDR; |
8f73d4b7 | 1110 | |
6072cf56 MR |
1111 | if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { |
1112 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", | |
1113 | base, base + size); | |
1114 | return; | |
1115 | } | |
1116 | ||
8f73d4b7 GU |
1117 | if (!PAGE_ALIGNED(base)) { |
1118 | size -= PAGE_SIZE - (base & ~PAGE_MASK); | |
1119 | base = PAGE_ALIGN(base); | |
1120 | } | |
068f6310 | 1121 | size &= PAGE_MASK; |
a67a6ed1 | 1122 | |
8eafeb48 | 1123 | if (base > MAX_MEMBLOCK_ADDR) { |
e2f04da7 KW |
1124 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", |
1125 | base, base + size); | |
3069f0c0 LA |
1126 | return; |
1127 | } | |
a67a6ed1 | 1128 | |
8eafeb48 | 1129 | if (base + size - 1 > MAX_MEMBLOCK_ADDR) { |
e2f04da7 KW |
1130 | pr_warn("Ignoring memory range 0x%llx - 0x%llx\n", |
1131 | ((u64)MAX_MEMBLOCK_ADDR) + 1, base + size); | |
8eafeb48 | 1132 | size = MAX_MEMBLOCK_ADDR - base + 1; |
a67a6ed1 LA |
1133 | } |
1134 | ||
068f6310 | 1135 | if (base + size < phys_offset) { |
e2f04da7 KW |
1136 | pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", |
1137 | base, base + size); | |
068f6310 RH |
1138 | return; |
1139 | } | |
1140 | if (base < phys_offset) { | |
e2f04da7 KW |
1141 | pr_warn("Ignoring memory range 0x%llx - 0x%llx\n", |
1142 | base, phys_offset); | |
068f6310 RH |
1143 | size -= phys_offset - base; |
1144 | base = phys_offset; | |
1145 | } | |
1146 | memblock_add(base, size); | |
1147 | } | |
1148 | ||
0fa1c579 | 1149 | static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) |
aefc7ec2 | 1150 | { |
8a7f97b9 MR |
1151 | void *ptr = memblock_alloc(size, align); |
1152 | ||
1153 | if (!ptr) | |
1154 | panic("%s: Failed to allocate %llu bytes align=0x%llx\n", | |
1155 | __func__, size, align); | |
1156 | ||
1157 | return ptr; | |
aefc7ec2 | 1158 | } |
a1727da5 | 1159 | |
4972a74b | 1160 | bool __init early_init_dt_verify(void *params) |
0288ffcb RH |
1161 | { |
1162 | if (!params) | |
1163 | return false; | |
1164 | ||
0288ffcb | 1165 | /* check device tree validity */ |
50ba08f3 | 1166 | if (fdt_check_header(params)) |
0288ffcb | 1167 | return false; |
0288ffcb | 1168 | |
50ba08f3 BH |
1169 | /* Setup flat device-tree pointer */ |
1170 | initial_boot_params = params; | |
dd753d96 HYW |
1171 | of_fdt_crc32 = crc32_be(~0, initial_boot_params, |
1172 | fdt_totalsize(initial_boot_params)); | |
4972a74b LA |
1173 | return true; |
1174 | } | |
1175 | ||
1176 | ||
1177 | void __init early_init_dt_scan_nodes(void) | |
1178 | { | |
60f20d84 | 1179 | int rc; |
e1e52544 | 1180 | |
f7e7ce93 | 1181 | /* Initialize {size,address}-cells info */ |
d665881d | 1182 | early_init_dt_scan_root(); |
f7e7ce93 | 1183 | |
0288ffcb | 1184 | /* Retrieve various information from the /chosen node */ |
60f20d84 RH |
1185 | rc = early_init_dt_scan_chosen(boot_command_line); |
1186 | if (rc) | |
e1e52544 | 1187 | pr_warn("No chosen node found, continuing without\n"); |
0288ffcb | 1188 | |
0288ffcb | 1189 | /* Setup memory, calling early_init_dt_add_memory_arch */ |
1f012283 | 1190 | early_init_dt_scan_memory(); |
2af2b50a GU |
1191 | |
1192 | /* Handle linux,usable-memory-range property */ | |
8347b417 | 1193 | early_init_dt_check_for_usable_mem_range(); |
4972a74b LA |
1194 | } |
1195 | ||
1196 | bool __init early_init_dt_scan(void *params) | |
1197 | { | |
1198 | bool status; | |
1199 | ||
1200 | status = early_init_dt_verify(params); | |
1201 | if (!status) | |
1202 | return false; | |
0288ffcb | 1203 | |
4972a74b | 1204 | early_init_dt_scan_nodes(); |
0288ffcb RH |
1205 | return true; |
1206 | } | |
1207 | ||
dc1460fe SB |
1208 | static void *__init copy_device_tree(void *fdt) |
1209 | { | |
1210 | int size; | |
1211 | void *dt; | |
1212 | ||
1213 | size = fdt_totalsize(fdt); | |
1214 | dt = early_init_dt_alloc_memory_arch(size, | |
1215 | roundup_pow_of_two(FDT_V17_SIZE)); | |
1216 | ||
1217 | if (dt) | |
1218 | memcpy(dt, fdt, size); | |
1219 | ||
1220 | return dt; | |
1221 | } | |
1222 | ||
41f88009 GL |
1223 | /** |
1224 | * unflatten_device_tree - create tree of device_nodes from flat blob | |
1225 | * | |
1226 | * unflattens the device-tree passed by the firmware, creating the | |
1227 | * tree of struct device_node. It also fills the "name" and "type" | |
1228 | * pointers of the nodes so the normal device-tree walking functions | |
1229 | * can be used. | |
1230 | */ | |
1231 | void __init unflatten_device_tree(void) | |
1232 | { | |
7b937cc2 FR |
1233 | void *fdt = initial_boot_params; |
1234 | ||
1235 | /* Don't use the bootloader provided DTB if ACPI is enabled */ | |
1236 | if (!acpi_disabled) | |
1237 | fdt = NULL; | |
1238 | ||
1239 | /* | |
1240 | * Populate an empty root node when ACPI is enabled or bootloader | |
1241 | * doesn't provide one. | |
1242 | */ | |
1243 | if (!fdt) { | |
1244 | fdt = (void *) __dtb_empty_root_begin; | |
1245 | /* fdt_totalsize() will be used for copy size */ | |
1246 | if (fdt_totalsize(fdt) > | |
1247 | __dtb_empty_root_end - __dtb_empty_root_begin) { | |
1248 | pr_err("invalid size in dtb_empty_root\n"); | |
1249 | return; | |
1250 | } | |
1251 | of_fdt_crc32 = crc32_be(~0, fdt, fdt_totalsize(fdt)); | |
1252 | fdt = copy_device_tree(fdt); | |
1253 | } | |
1254 | ||
1255 | __unflatten_device_tree(fdt, NULL, &of_root, | |
1d1bde55 | 1256 | early_init_dt_alloc_memory_arch, false); |
41f88009 | 1257 | |
4c7d6361 | 1258 | /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ |
611cad72 | 1259 | of_alias_scan(early_init_dt_alloc_memory_arch); |
81d0848f FR |
1260 | |
1261 | unittest_unflatten_overlay_base(); | |
41f88009 | 1262 | } |
e6ce1324 | 1263 | |
a8bf7527 RH |
1264 | /** |
1265 | * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob | |
1266 | * | |
1267 | * Copies and unflattens the device-tree passed by the firmware, creating the | |
1268 | * tree of struct device_node. It also fills the "name" and "type" | |
1269 | * pointers of the nodes so the normal device-tree walking functions | |
1270 | * can be used. This should only be used when the FDT memory has not been | |
1271 | * reserved such is the case when the FDT is built-in to the kernel init | |
1272 | * section. If the FDT memory is reserved already then unflatten_device_tree | |
1273 | * should be used instead. | |
1274 | */ | |
1275 | void __init unflatten_and_copy_device_tree(void) | |
1276 | { | |
dc1460fe SB |
1277 | if (initial_boot_params) |
1278 | initial_boot_params = copy_device_tree(initial_boot_params); | |
6f041e99 | 1279 | |
a8bf7527 RH |
1280 | unflatten_device_tree(); |
1281 | } | |
1282 | ||
08d53aa5 AB |
1283 | #ifdef CONFIG_SYSFS |
1284 | static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, | |
1285 | struct bin_attribute *bin_attr, | |
1286 | char *buf, loff_t off, size_t count) | |
b0a6fb36 | 1287 | { |
08d53aa5 AB |
1288 | memcpy(buf, initial_boot_params + off, count); |
1289 | return count; | |
1290 | } | |
b0a6fb36 | 1291 | |
08d53aa5 AB |
1292 | static int __init of_fdt_raw_init(void) |
1293 | { | |
1294 | static struct bin_attribute of_fdt_raw_attr = | |
1295 | __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); | |
b0a6fb36 | 1296 | |
08d53aa5 AB |
1297 | if (!initial_boot_params) |
1298 | return 0; | |
b0a6fb36 | 1299 | |
08d53aa5 AB |
1300 | if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, |
1301 | fdt_totalsize(initial_boot_params))) { | |
606ad42a | 1302 | pr_warn("not creating '/sys/firmware/fdt': CRC check failed\n"); |
08d53aa5 AB |
1303 | return 0; |
1304 | } | |
1305 | of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); | |
1306 | return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); | |
b0a6fb36 | 1307 | } |
08d53aa5 | 1308 | late_initcall(of_fdt_raw_init); |
b0a6fb36 RH |
1309 | #endif |
1310 | ||
e6ce1324 | 1311 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |