xref: /openbmc/linux/arch/powerpc/kernel/prom.c (revision d2999e1b)
1 /*
2  * Procedures for creating, accessing and interpreting the device tree.
3  *
4  * Paul Mackerras	August 1996.
5  * Copyright (C) 1996-2005 Paul Mackerras.
6  *
7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
8  *    {engebret|bergner}@us.ibm.com
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15 
16 #undef DEBUG
17 
18 #include <stdarg.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
22 #include <linux/threads.h>
23 #include <linux/spinlock.h>
24 #include <linux/types.h>
25 #include <linux/pci.h>
26 #include <linux/stringify.h>
27 #include <linux/delay.h>
28 #include <linux/initrd.h>
29 #include <linux/bitops.h>
30 #include <linux/export.h>
31 #include <linux/kexec.h>
32 #include <linux/irq.h>
33 #include <linux/memblock.h>
34 #include <linux/of.h>
35 #include <linux/of_fdt.h>
36 #include <linux/libfdt.h>
37 
38 #include <asm/prom.h>
39 #include <asm/rtas.h>
40 #include <asm/page.h>
41 #include <asm/processor.h>
42 #include <asm/irq.h>
43 #include <asm/io.h>
44 #include <asm/kdump.h>
45 #include <asm/smp.h>
46 #include <asm/mmu.h>
47 #include <asm/paca.h>
48 #include <asm/pgtable.h>
49 #include <asm/pci.h>
50 #include <asm/iommu.h>
51 #include <asm/btext.h>
52 #include <asm/sections.h>
53 #include <asm/machdep.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/kexec.h>
56 #include <asm/opal.h>
57 #include <asm/fadump.h>
58 #include <asm/debug.h>
59 
60 #include <mm/mmu_decl.h>
61 
62 #ifdef DEBUG
63 #define DBG(fmt...) printk(KERN_ERR fmt)
64 #else
65 #define DBG(fmt...)
66 #endif
67 
68 #ifdef CONFIG_PPC64
69 int __initdata iommu_is_off;
70 int __initdata iommu_force_on;
71 unsigned long tce_alloc_start, tce_alloc_end;
72 u64 ppc64_rma_size;
73 #endif
74 static phys_addr_t first_memblock_size;
75 static int __initdata boot_cpu_count;
76 
77 static int __init early_parse_mem(char *p)
78 {
79 	if (!p)
80 		return 1;
81 
82 	memory_limit = PAGE_ALIGN(memparse(p, &p));
83 	DBG("memory limit = 0x%llx\n", memory_limit);
84 
85 	return 0;
86 }
87 early_param("mem", early_parse_mem);
88 
89 /*
90  * overlaps_initrd - check for overlap with page aligned extension of
91  * initrd.
92  */
93 static inline int overlaps_initrd(unsigned long start, unsigned long size)
94 {
95 #ifdef CONFIG_BLK_DEV_INITRD
96 	if (!initrd_start)
97 		return 0;
98 
99 	return	(start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
100 			start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
101 #else
102 	return 0;
103 #endif
104 }
105 
106 /**
107  * move_device_tree - move tree to an unused area, if needed.
108  *
109  * The device tree may be allocated beyond our memory limit, or inside the
110  * crash kernel region for kdump, or within the page aligned range of initrd.
111  * If so, move it out of the way.
112  */
113 static void __init move_device_tree(void)
114 {
115 	unsigned long start, size;
116 	void *p;
117 
118 	DBG("-> move_device_tree\n");
119 
120 	start = __pa(initial_boot_params);
121 	size = fdt_totalsize(initial_boot_params);
122 
123 	if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
124 			overlaps_crashkernel(start, size) ||
125 			overlaps_initrd(start, size)) {
126 		p = __va(memblock_alloc(size, PAGE_SIZE));
127 		memcpy(p, initial_boot_params, size);
128 		initial_boot_params = p;
129 		DBG("Moved device tree to 0x%p\n", p);
130 	}
131 
132 	DBG("<- move_device_tree\n");
133 }
134 
135 /*
136  * ibm,pa-features is a per-cpu property that contains a string of
137  * attribute descriptors, each of which has a 2 byte header plus up
138  * to 254 bytes worth of processor attribute bits.  First header
139  * byte specifies the number of bytes following the header.
140  * Second header byte is an "attribute-specifier" type, of which
141  * zero is the only currently-defined value.
142  * Implementation:  Pass in the byte and bit offset for the feature
143  * that we are interested in.  The function will return -1 if the
144  * pa-features property is missing, or a 1/0 to indicate if the feature
145  * is supported/not supported.  Note that the bit numbers are
146  * big-endian to match the definition in PAPR.
147  */
148 static struct ibm_pa_feature {
149 	unsigned long	cpu_features;	/* CPU_FTR_xxx bit */
150 	unsigned long	mmu_features;	/* MMU_FTR_xxx bit */
151 	unsigned int	cpu_user_ftrs;	/* PPC_FEATURE_xxx bit */
152 	unsigned char	pabyte;		/* byte number in ibm,pa-features */
153 	unsigned char	pabit;		/* bit number (big-endian) */
154 	unsigned char	invert;		/* if 1, pa bit set => clear feature */
155 } ibm_pa_features[] __initdata = {
156 	{0, 0, PPC_FEATURE_HAS_MMU,	0, 0, 0},
157 	{0, 0, PPC_FEATURE_HAS_FPU,	0, 1, 0},
158 	{0, MMU_FTR_SLB, 0,		0, 2, 0},
159 	{CPU_FTR_CTRL, 0, 0,		0, 3, 0},
160 	{CPU_FTR_NOEXECUTE, 0, 0,	0, 6, 0},
161 	{CPU_FTR_NODSISRALIGN, 0, 0,	1, 1, 1},
162 	{0, MMU_FTR_CI_LARGE_PAGE, 0,	1, 2, 0},
163 	{CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
164 };
165 
166 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
167 				 unsigned long tablelen,
168 				 struct ibm_pa_feature *fp,
169 				 unsigned long ft_size)
170 {
171 	unsigned long i, len, bit;
172 
173 	/* find descriptor with type == 0 */
174 	for (;;) {
175 		if (tablelen < 3)
176 			return;
177 		len = 2 + ftrs[0];
178 		if (tablelen < len)
179 			return;		/* descriptor 0 not found */
180 		if (ftrs[1] == 0)
181 			break;
182 		tablelen -= len;
183 		ftrs += len;
184 	}
185 
186 	/* loop over bits we know about */
187 	for (i = 0; i < ft_size; ++i, ++fp) {
188 		if (fp->pabyte >= ftrs[0])
189 			continue;
190 		bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
191 		if (bit ^ fp->invert) {
192 			cur_cpu_spec->cpu_features |= fp->cpu_features;
193 			cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
194 			cur_cpu_spec->mmu_features |= fp->mmu_features;
195 		} else {
196 			cur_cpu_spec->cpu_features &= ~fp->cpu_features;
197 			cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
198 			cur_cpu_spec->mmu_features &= ~fp->mmu_features;
199 		}
200 	}
201 }
202 
203 static void __init check_cpu_pa_features(unsigned long node)
204 {
205 	const unsigned char *pa_ftrs;
206 	int tablelen;
207 
208 	pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
209 	if (pa_ftrs == NULL)
210 		return;
211 
212 	scan_features(node, pa_ftrs, tablelen,
213 		      ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
214 }
215 
216 #ifdef CONFIG_PPC_STD_MMU_64
217 static void __init check_cpu_slb_size(unsigned long node)
218 {
219 	const __be32 *slb_size_ptr;
220 
221 	slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
222 	if (slb_size_ptr != NULL) {
223 		mmu_slb_size = be32_to_cpup(slb_size_ptr);
224 		return;
225 	}
226 	slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
227 	if (slb_size_ptr != NULL) {
228 		mmu_slb_size = be32_to_cpup(slb_size_ptr);
229 	}
230 }
231 #else
232 #define check_cpu_slb_size(node) do { } while(0)
233 #endif
234 
235 static struct feature_property {
236 	const char *name;
237 	u32 min_value;
238 	unsigned long cpu_feature;
239 	unsigned long cpu_user_ftr;
240 } feature_properties[] __initdata = {
241 #ifdef CONFIG_ALTIVEC
242 	{"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
243 	{"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
244 #endif /* CONFIG_ALTIVEC */
245 #ifdef CONFIG_VSX
246 	/* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
247 	{"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
248 #endif /* CONFIG_VSX */
249 #ifdef CONFIG_PPC64
250 	{"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
251 	{"ibm,purr", 1, CPU_FTR_PURR, 0},
252 	{"ibm,spurr", 1, CPU_FTR_SPURR, 0},
253 #endif /* CONFIG_PPC64 */
254 };
255 
256 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
257 static inline void identical_pvr_fixup(unsigned long node)
258 {
259 	unsigned int pvr;
260 	const char *model = of_get_flat_dt_prop(node, "model", NULL);
261 
262 	/*
263 	 * Since 440GR(x)/440EP(x) processors have the same pvr,
264 	 * we check the node path and set bit 28 in the cur_cpu_spec
265 	 * pvr for EP(x) processor version. This bit is always 0 in
266 	 * the "real" pvr. Then we call identify_cpu again with
267 	 * the new logical pvr to enable FPU support.
268 	 */
269 	if (model && strstr(model, "440EP")) {
270 		pvr = cur_cpu_spec->pvr_value | 0x8;
271 		identify_cpu(0, pvr);
272 		DBG("Using logical pvr %x for %s\n", pvr, model);
273 	}
274 }
275 #else
276 #define identical_pvr_fixup(node) do { } while(0)
277 #endif
278 
279 static void __init check_cpu_feature_properties(unsigned long node)
280 {
281 	unsigned long i;
282 	struct feature_property *fp = feature_properties;
283 	const __be32 *prop;
284 
285 	for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
286 		prop = of_get_flat_dt_prop(node, fp->name, NULL);
287 		if (prop && be32_to_cpup(prop) >= fp->min_value) {
288 			cur_cpu_spec->cpu_features |= fp->cpu_feature;
289 			cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
290 		}
291 	}
292 }
293 
294 static int __init early_init_dt_scan_cpus(unsigned long node,
295 					  const char *uname, int depth,
296 					  void *data)
297 {
298 	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
299 	const __be32 *prop;
300 	const __be32 *intserv;
301 	int i, nthreads;
302 	int len;
303 	int found = -1;
304 	int found_thread = 0;
305 
306 	/* We are scanning "cpu" nodes only */
307 	if (type == NULL || strcmp(type, "cpu") != 0)
308 		return 0;
309 
310 	/* Get physical cpuid */
311 	intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
312 	if (intserv) {
313 		nthreads = len / sizeof(int);
314 	} else {
315 		intserv = of_get_flat_dt_prop(node, "reg", NULL);
316 		nthreads = 1;
317 	}
318 
319 	/*
320 	 * Now see if any of these threads match our boot cpu.
321 	 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
322 	 */
323 	for (i = 0; i < nthreads; i++) {
324 		/*
325 		 * version 2 of the kexec param format adds the phys cpuid of
326 		 * booted proc.
327 		 */
328 		if (fdt_version(initial_boot_params) >= 2) {
329 			if (be32_to_cpu(intserv[i]) ==
330 			    fdt_boot_cpuid_phys(initial_boot_params)) {
331 				found = boot_cpu_count;
332 				found_thread = i;
333 			}
334 		} else {
335 			/*
336 			 * Check if it's the boot-cpu, set it's hw index now,
337 			 * unfortunately this format did not support booting
338 			 * off secondary threads.
339 			 */
340 			if (of_get_flat_dt_prop(node,
341 					"linux,boot-cpu", NULL) != NULL)
342 				found = boot_cpu_count;
343 		}
344 #ifdef CONFIG_SMP
345 		/* logical cpu id is always 0 on UP kernels */
346 		boot_cpu_count++;
347 #endif
348 	}
349 
350 	/* Not the boot CPU */
351 	if (found < 0)
352 		return 0;
353 
354 	DBG("boot cpu: logical %d physical %d\n", found,
355 	    be32_to_cpu(intserv[found_thread]));
356 	boot_cpuid = found;
357 	set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
358 
359 	/*
360 	 * PAPR defines "logical" PVR values for cpus that
361 	 * meet various levels of the architecture:
362 	 * 0x0f000001	Architecture version 2.04
363 	 * 0x0f000002	Architecture version 2.05
364 	 * If the cpu-version property in the cpu node contains
365 	 * such a value, we call identify_cpu again with the
366 	 * logical PVR value in order to use the cpu feature
367 	 * bits appropriate for the architecture level.
368 	 *
369 	 * A POWER6 partition in "POWER6 architected" mode
370 	 * uses the 0x0f000002 PVR value; in POWER5+ mode
371 	 * it uses 0x0f000001.
372 	 */
373 	prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
374 	if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
375 		identify_cpu(0, be32_to_cpup(prop));
376 
377 	identical_pvr_fixup(node);
378 
379 	check_cpu_feature_properties(node);
380 	check_cpu_pa_features(node);
381 	check_cpu_slb_size(node);
382 
383 #ifdef CONFIG_PPC64
384 	if (nthreads > 1)
385 		cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
386 	else
387 		cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
388 #endif
389 	return 0;
390 }
391 
392 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
393 					 int depth, void *data)
394 {
395 	const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
396 
397 	/* Use common scan routine to determine if this is the chosen node */
398 	if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
399 		return 0;
400 
401 #ifdef CONFIG_PPC64
402 	/* check if iommu is forced on or off */
403 	if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
404 		iommu_is_off = 1;
405 	if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
406 		iommu_force_on = 1;
407 #endif
408 
409 	/* mem=x on the command line is the preferred mechanism */
410 	lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
411 	if (lprop)
412 		memory_limit = *lprop;
413 
414 #ifdef CONFIG_PPC64
415 	lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
416 	if (lprop)
417 		tce_alloc_start = *lprop;
418 	lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
419 	if (lprop)
420 		tce_alloc_end = *lprop;
421 #endif
422 
423 #ifdef CONFIG_KEXEC
424 	lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
425 	if (lprop)
426 		crashk_res.start = *lprop;
427 
428 	lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
429 	if (lprop)
430 		crashk_res.end = crashk_res.start + *lprop - 1;
431 #endif
432 
433 	/* break now */
434 	return 1;
435 }
436 
437 #ifdef CONFIG_PPC_PSERIES
438 /*
439  * Interpret the ibm,dynamic-memory property in the
440  * /ibm,dynamic-reconfiguration-memory node.
441  * This contains a list of memory blocks along with NUMA affinity
442  * information.
443  */
444 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
445 {
446 	const __be32 *dm, *ls, *usm;
447 	int l;
448 	unsigned long n, flags;
449 	u64 base, size, memblock_size;
450 	unsigned int is_kexec_kdump = 0, rngs;
451 
452 	ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
453 	if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
454 		return 0;
455 	memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
456 
457 	dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
458 	if (dm == NULL || l < sizeof(__be32))
459 		return 0;
460 
461 	n = of_read_number(dm++, 1);	/* number of entries */
462 	if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
463 		return 0;
464 
465 	/* check if this is a kexec/kdump kernel. */
466 	usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
467 						 &l);
468 	if (usm != NULL)
469 		is_kexec_kdump = 1;
470 
471 	for (; n != 0; --n) {
472 		base = dt_mem_next_cell(dt_root_addr_cells, &dm);
473 		flags = of_read_number(&dm[3], 1);
474 		/* skip DRC index, pad, assoc. list index, flags */
475 		dm += 4;
476 		/* skip this block if the reserved bit is set in flags (0x80)
477 		   or if the block is not assigned to this partition (0x8) */
478 		if ((flags & 0x80) || !(flags & 0x8))
479 			continue;
480 		size = memblock_size;
481 		rngs = 1;
482 		if (is_kexec_kdump) {
483 			/*
484 			 * For each memblock in ibm,dynamic-memory, a corresponding
485 			 * entry in linux,drconf-usable-memory property contains
486 			 * a counter 'p' followed by 'p' (base, size) duple.
487 			 * Now read the counter from
488 			 * linux,drconf-usable-memory property
489 			 */
490 			rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
491 			if (!rngs) /* there are no (base, size) duple */
492 				continue;
493 		}
494 		do {
495 			if (is_kexec_kdump) {
496 				base = dt_mem_next_cell(dt_root_addr_cells,
497 							 &usm);
498 				size = dt_mem_next_cell(dt_root_size_cells,
499 							 &usm);
500 			}
501 			if (iommu_is_off) {
502 				if (base >= 0x80000000ul)
503 					continue;
504 				if ((base + size) > 0x80000000ul)
505 					size = 0x80000000ul - base;
506 			}
507 			memblock_add(base, size);
508 		} while (--rngs);
509 	}
510 	memblock_dump_all();
511 	return 0;
512 }
513 #else
514 #define early_init_dt_scan_drconf_memory(node)	0
515 #endif /* CONFIG_PPC_PSERIES */
516 
517 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
518 						const char *uname,
519 						int depth, void *data)
520 {
521 	if (depth == 1 &&
522 	    strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
523 		return early_init_dt_scan_drconf_memory(node);
524 
525 	return early_init_dt_scan_memory(node, uname, depth, data);
526 }
527 
528 /*
529  * For a relocatable kernel, we need to get the memstart_addr first,
530  * then use it to calculate the virtual kernel start address. This has
531  * to happen at a very early stage (before machine_init). In this case,
532  * we just want to get the memstart_address and would not like to mess the
533  * memblock at this stage. So introduce a variable to skip the memblock_add()
534  * for this reason.
535  */
536 #ifdef CONFIG_RELOCATABLE
537 static int add_mem_to_memblock = 1;
538 #else
539 #define add_mem_to_memblock 1
540 #endif
541 
542 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
543 {
544 #ifdef CONFIG_PPC64
545 	if (iommu_is_off) {
546 		if (base >= 0x80000000ul)
547 			return;
548 		if ((base + size) > 0x80000000ul)
549 			size = 0x80000000ul - base;
550 	}
551 #endif
552 	/* Keep track of the beginning of memory -and- the size of
553 	 * the very first block in the device-tree as it represents
554 	 * the RMA on ppc64 server
555 	 */
556 	if (base < memstart_addr) {
557 		memstart_addr = base;
558 		first_memblock_size = size;
559 	}
560 
561 	/* Add the chunk to the MEMBLOCK list */
562 	if (add_mem_to_memblock)
563 		memblock_add(base, size);
564 }
565 
566 static void __init early_reserve_mem_dt(void)
567 {
568 	unsigned long i, dt_root;
569 	int len;
570 	const __be32 *prop;
571 
572 	early_init_fdt_scan_reserved_mem();
573 
574 	dt_root = of_get_flat_dt_root();
575 
576 	prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
577 
578 	if (!prop)
579 		return;
580 
581 	DBG("Found new-style reserved-ranges\n");
582 
583 	/* Each reserved range is an (address,size) pair, 2 cells each,
584 	 * totalling 4 cells per range. */
585 	for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
586 		u64 base, size;
587 
588 		base = of_read_number(prop + (i * 4) + 0, 2);
589 		size = of_read_number(prop + (i * 4) + 2, 2);
590 
591 		if (size) {
592 			DBG("reserving: %llx -> %llx\n", base, size);
593 			memblock_reserve(base, size);
594 		}
595 	}
596 }
597 
598 static void __init early_reserve_mem(void)
599 {
600 	__be64 *reserve_map;
601 
602 	reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
603 			fdt_off_mem_rsvmap(initial_boot_params));
604 
605 	/* Look for the new "reserved-regions" property in the DT */
606 	early_reserve_mem_dt();
607 
608 #ifdef CONFIG_BLK_DEV_INITRD
609 	/* Then reserve the initrd, if any */
610 	if (initrd_start && (initrd_end > initrd_start)) {
611 		memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
612 			_ALIGN_UP(initrd_end, PAGE_SIZE) -
613 			_ALIGN_DOWN(initrd_start, PAGE_SIZE));
614 	}
615 #endif /* CONFIG_BLK_DEV_INITRD */
616 
617 #ifdef CONFIG_PPC32
618 	/*
619 	 * Handle the case where we might be booting from an old kexec
620 	 * image that setup the mem_rsvmap as pairs of 32-bit values
621 	 */
622 	if (be64_to_cpup(reserve_map) > 0xffffffffull) {
623 		u32 base_32, size_32;
624 		__be32 *reserve_map_32 = (__be32 *)reserve_map;
625 
626 		DBG("Found old 32-bit reserve map\n");
627 
628 		while (1) {
629 			base_32 = be32_to_cpup(reserve_map_32++);
630 			size_32 = be32_to_cpup(reserve_map_32++);
631 			if (size_32 == 0)
632 				break;
633 			DBG("reserving: %x -> %x\n", base_32, size_32);
634 			memblock_reserve(base_32, size_32);
635 		}
636 		return;
637 	}
638 #endif
639 }
640 
641 void __init early_init_devtree(void *params)
642 {
643 	phys_addr_t limit;
644 
645 	DBG(" -> early_init_devtree(%p)\n", params);
646 
647 	/* Setup flat device-tree pointer */
648 	initial_boot_params = params;
649 
650 #ifdef CONFIG_PPC_RTAS
651 	/* Some machines might need RTAS info for debugging, grab it now. */
652 	of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
653 #endif
654 
655 #ifdef CONFIG_PPC_POWERNV
656 	/* Some machines might need OPAL info for debugging, grab it now. */
657 	of_scan_flat_dt(early_init_dt_scan_opal, NULL);
658 #endif
659 
660 #ifdef CONFIG_FA_DUMP
661 	/* scan tree to see if dump is active during last boot */
662 	of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
663 #endif
664 
665 	/* Retrieve various informations from the /chosen node of the
666 	 * device-tree, including the platform type, initrd location and
667 	 * size, TCE reserve, and more ...
668 	 */
669 	of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
670 
671 	/* Scan memory nodes and rebuild MEMBLOCKs */
672 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
673 	of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
674 
675 	/* Save command line for /proc/cmdline and then parse parameters */
676 	strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
677 	parse_early_param();
678 
679 	/* make sure we've parsed cmdline for mem= before this */
680 	if (memory_limit)
681 		first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
682 	setup_initial_memory_limit(memstart_addr, first_memblock_size);
683 	/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
684 	memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
685 	/* If relocatable, reserve first 32k for interrupt vectors etc. */
686 	if (PHYSICAL_START > MEMORY_START)
687 		memblock_reserve(MEMORY_START, 0x8000);
688 	reserve_kdump_trampoline();
689 #ifdef CONFIG_FA_DUMP
690 	/*
691 	 * If we fail to reserve memory for firmware-assisted dump then
692 	 * fallback to kexec based kdump.
693 	 */
694 	if (fadump_reserve_mem() == 0)
695 #endif
696 		reserve_crashkernel();
697 	early_reserve_mem();
698 
699 	/*
700 	 * Ensure that total memory size is page-aligned, because otherwise
701 	 * mark_bootmem() gets upset.
702 	 */
703 	limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
704 	memblock_enforce_memory_limit(limit);
705 
706 	memblock_allow_resize();
707 	memblock_dump_all();
708 
709 	DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
710 
711 	/* We may need to relocate the flat tree, do it now.
712 	 * FIXME .. and the initrd too? */
713 	move_device_tree();
714 
715 	allocate_pacas();
716 
717 	DBG("Scanning CPUs ...\n");
718 
719 	/* Retrieve CPU related informations from the flat tree
720 	 * (altivec support, boot CPU ID, ...)
721 	 */
722 	of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
723 	if (boot_cpuid < 0) {
724 		printk("Failed to indentify boot CPU !\n");
725 		BUG();
726 	}
727 
728 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
729 	/* We'll later wait for secondaries to check in; there are
730 	 * NCPUS-1 non-boot CPUs  :-)
731 	 */
732 	spinning_secondaries = boot_cpu_count - 1;
733 #endif
734 
735 #ifdef CONFIG_PPC_POWERNV
736 	/* Scan and build the list of machine check recoverable ranges */
737 	of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
738 #endif
739 
740 	DBG(" <- early_init_devtree()\n");
741 }
742 
743 #ifdef CONFIG_RELOCATABLE
744 /*
745  * This function run before early_init_devtree, so we have to init
746  * initial_boot_params.
747  */
748 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
749 {
750 	/* Setup flat device-tree pointer */
751 	initial_boot_params = params;
752 
753 	/*
754 	 * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
755 	 * mess the memblock.
756 	 */
757 	add_mem_to_memblock = 0;
758 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
759 	of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
760 	add_mem_to_memblock = 1;
761 
762 	if (size)
763 		*size = first_memblock_size;
764 }
765 #endif
766 
767 /*******
768  *
769  * New implementation of the OF "find" APIs, return a refcounted
770  * object, call of_node_put() when done.  The device tree and list
771  * are protected by a rw_lock.
772  *
773  * Note that property management will need some locking as well,
774  * this isn't dealt with yet.
775  *
776  *******/
777 
778 /**
779  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
780  * @np: device node of the device
781  *
782  * This looks for a property "ibm,chip-id" in the node or any
783  * of its parents and returns its content, or -1 if it cannot
784  * be found.
785  */
786 int of_get_ibm_chip_id(struct device_node *np)
787 {
788 	of_node_get(np);
789 	while(np) {
790 		struct device_node *old = np;
791 		const __be32 *prop;
792 
793 		prop = of_get_property(np, "ibm,chip-id", NULL);
794 		if (prop) {
795 			of_node_put(np);
796 			return be32_to_cpup(prop);
797 		}
798 		np = of_get_parent(np);
799 		of_node_put(old);
800 	}
801 	return -1;
802 }
803 
804 /**
805  * cpu_to_chip_id - Return the cpus chip-id
806  * @cpu: The logical cpu number.
807  *
808  * Return the value of the ibm,chip-id property corresponding to the given
809  * logical cpu number. If the chip-id can not be found, returns -1.
810  */
811 int cpu_to_chip_id(int cpu)
812 {
813 	struct device_node *np;
814 
815 	np = of_get_cpu_node(cpu, NULL);
816 	if (!np)
817 		return -1;
818 
819 	of_node_put(np);
820 	return of_get_ibm_chip_id(np);
821 }
822 EXPORT_SYMBOL(cpu_to_chip_id);
823 
824 #ifdef CONFIG_PPC_PSERIES
825 /*
826  * Fix up the uninitialized fields in a new device node:
827  * name, type and pci-specific fields
828  */
829 
830 static int of_finish_dynamic_node(struct device_node *node)
831 {
832 	struct device_node *parent = of_get_parent(node);
833 	int err = 0;
834 	const phandle *ibm_phandle;
835 
836 	node->name = of_get_property(node, "name", NULL);
837 	node->type = of_get_property(node, "device_type", NULL);
838 
839 	if (!node->name)
840 		node->name = "<NULL>";
841 	if (!node->type)
842 		node->type = "<NULL>";
843 
844 	if (!parent) {
845 		err = -ENODEV;
846 		goto out;
847 	}
848 
849 	/* We don't support that function on PowerMac, at least
850 	 * not yet
851 	 */
852 	if (machine_is(powermac))
853 		return -ENODEV;
854 
855 	/* fix up new node's phandle field */
856 	if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
857 		node->phandle = *ibm_phandle;
858 
859 out:
860 	of_node_put(parent);
861 	return err;
862 }
863 
864 static int prom_reconfig_notifier(struct notifier_block *nb,
865 				  unsigned long action, void *node)
866 {
867 	int err;
868 
869 	switch (action) {
870 	case OF_RECONFIG_ATTACH_NODE:
871 		err = of_finish_dynamic_node(node);
872 		if (err < 0)
873 			printk(KERN_ERR "finish_node returned %d\n", err);
874 		break;
875 	default:
876 		err = 0;
877 		break;
878 	}
879 	return notifier_from_errno(err);
880 }
881 
882 static struct notifier_block prom_reconfig_nb = {
883 	.notifier_call = prom_reconfig_notifier,
884 	.priority = 10, /* This one needs to run first */
885 };
886 
887 static int __init prom_reconfig_setup(void)
888 {
889 	return of_reconfig_notifier_register(&prom_reconfig_nb);
890 }
891 __initcall(prom_reconfig_setup);
892 #endif
893 
894 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
895 {
896 	return (int)phys_id == get_hard_smp_processor_id(cpu);
897 }
898