xref: /openbmc/linux/arch/powerpc/kernel/prom.c (revision bc000245)
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/debugfs.h>
33 #include <linux/irq.h>
34 #include <linux/memblock.h>
35 #include <linux/of.h>
36 
37 #include <asm/prom.h>
38 #include <asm/rtas.h>
39 #include <asm/page.h>
40 #include <asm/processor.h>
41 #include <asm/irq.h>
42 #include <asm/io.h>
43 #include <asm/kdump.h>
44 #include <asm/smp.h>
45 #include <asm/mmu.h>
46 #include <asm/paca.h>
47 #include <asm/pgtable.h>
48 #include <asm/pci.h>
49 #include <asm/iommu.h>
50 #include <asm/btext.h>
51 #include <asm/sections.h>
52 #include <asm/machdep.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/kexec.h>
55 #include <asm/opal.h>
56 #include <asm/fadump.h>
57 #include <asm/debug.h>
58 
59 #include <mm/mmu_decl.h>
60 
61 #ifdef DEBUG
62 #define DBG(fmt...) printk(KERN_ERR fmt)
63 #else
64 #define DBG(fmt...)
65 #endif
66 
67 #ifdef CONFIG_PPC64
68 int __initdata iommu_is_off;
69 int __initdata iommu_force_on;
70 unsigned long tce_alloc_start, tce_alloc_end;
71 u64 ppc64_rma_size;
72 #endif
73 static phys_addr_t first_memblock_size;
74 static int __initdata boot_cpu_count;
75 
76 static int __init early_parse_mem(char *p)
77 {
78 	if (!p)
79 		return 1;
80 
81 	memory_limit = PAGE_ALIGN(memparse(p, &p));
82 	DBG("memory limit = 0x%llx\n", memory_limit);
83 
84 	return 0;
85 }
86 early_param("mem", early_parse_mem);
87 
88 /*
89  * overlaps_initrd - check for overlap with page aligned extension of
90  * initrd.
91  */
92 static inline int overlaps_initrd(unsigned long start, unsigned long size)
93 {
94 #ifdef CONFIG_BLK_DEV_INITRD
95 	if (!initrd_start)
96 		return 0;
97 
98 	return	(start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
99 			start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
100 #else
101 	return 0;
102 #endif
103 }
104 
105 /**
106  * move_device_tree - move tree to an unused area, if needed.
107  *
108  * The device tree may be allocated beyond our memory limit, or inside the
109  * crash kernel region for kdump, or within the page aligned range of initrd.
110  * If so, move it out of the way.
111  */
112 static void __init move_device_tree(void)
113 {
114 	unsigned long start, size;
115 	void *p;
116 
117 	DBG("-> move_device_tree\n");
118 
119 	start = __pa(initial_boot_params);
120 	size = be32_to_cpu(initial_boot_params->totalsize);
121 
122 	if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
123 			overlaps_crashkernel(start, size) ||
124 			overlaps_initrd(start, size)) {
125 		p = __va(memblock_alloc(size, PAGE_SIZE));
126 		memcpy(p, initial_boot_params, size);
127 		initial_boot_params = (struct boot_param_header *)p;
128 		DBG("Moved device tree to 0x%p\n", p);
129 	}
130 
131 	DBG("<- move_device_tree\n");
132 }
133 
134 /*
135  * ibm,pa-features is a per-cpu property that contains a string of
136  * attribute descriptors, each of which has a 2 byte header plus up
137  * to 254 bytes worth of processor attribute bits.  First header
138  * byte specifies the number of bytes following the header.
139  * Second header byte is an "attribute-specifier" type, of which
140  * zero is the only currently-defined value.
141  * Implementation:  Pass in the byte and bit offset for the feature
142  * that we are interested in.  The function will return -1 if the
143  * pa-features property is missing, or a 1/0 to indicate if the feature
144  * is supported/not supported.  Note that the bit numbers are
145  * big-endian to match the definition in PAPR.
146  */
147 static struct ibm_pa_feature {
148 	unsigned long	cpu_features;	/* CPU_FTR_xxx bit */
149 	unsigned long	mmu_features;	/* MMU_FTR_xxx bit */
150 	unsigned int	cpu_user_ftrs;	/* PPC_FEATURE_xxx bit */
151 	unsigned char	pabyte;		/* byte number in ibm,pa-features */
152 	unsigned char	pabit;		/* bit number (big-endian) */
153 	unsigned char	invert;		/* if 1, pa bit set => clear feature */
154 } ibm_pa_features[] __initdata = {
155 	{0, 0, PPC_FEATURE_HAS_MMU,	0, 0, 0},
156 	{0, 0, PPC_FEATURE_HAS_FPU,	0, 1, 0},
157 	{0, MMU_FTR_SLB, 0,		0, 2, 0},
158 	{CPU_FTR_CTRL, 0, 0,		0, 3, 0},
159 	{CPU_FTR_NOEXECUTE, 0, 0,	0, 6, 0},
160 	{CPU_FTR_NODSISRALIGN, 0, 0,	1, 1, 1},
161 	{0, MMU_FTR_CI_LARGE_PAGE, 0,	1, 2, 0},
162 	{CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
163 };
164 
165 static void __init scan_features(unsigned long node, unsigned char *ftrs,
166 				 unsigned long tablelen,
167 				 struct ibm_pa_feature *fp,
168 				 unsigned long ft_size)
169 {
170 	unsigned long i, len, bit;
171 
172 	/* find descriptor with type == 0 */
173 	for (;;) {
174 		if (tablelen < 3)
175 			return;
176 		len = 2 + ftrs[0];
177 		if (tablelen < len)
178 			return;		/* descriptor 0 not found */
179 		if (ftrs[1] == 0)
180 			break;
181 		tablelen -= len;
182 		ftrs += len;
183 	}
184 
185 	/* loop over bits we know about */
186 	for (i = 0; i < ft_size; ++i, ++fp) {
187 		if (fp->pabyte >= ftrs[0])
188 			continue;
189 		bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
190 		if (bit ^ fp->invert) {
191 			cur_cpu_spec->cpu_features |= fp->cpu_features;
192 			cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
193 			cur_cpu_spec->mmu_features |= fp->mmu_features;
194 		} else {
195 			cur_cpu_spec->cpu_features &= ~fp->cpu_features;
196 			cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
197 			cur_cpu_spec->mmu_features &= ~fp->mmu_features;
198 		}
199 	}
200 }
201 
202 static void __init check_cpu_pa_features(unsigned long node)
203 {
204 	unsigned char *pa_ftrs;
205 	unsigned long tablelen;
206 
207 	pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
208 	if (pa_ftrs == NULL)
209 		return;
210 
211 	scan_features(node, pa_ftrs, tablelen,
212 		      ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
213 }
214 
215 #ifdef CONFIG_PPC_STD_MMU_64
216 static void __init check_cpu_slb_size(unsigned long node)
217 {
218 	__be32 *slb_size_ptr;
219 
220 	slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL);
221 	if (slb_size_ptr != NULL) {
222 		mmu_slb_size = be32_to_cpup(slb_size_ptr);
223 		return;
224 	}
225 	slb_size_ptr = of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
226 	if (slb_size_ptr != NULL) {
227 		mmu_slb_size = be32_to_cpup(slb_size_ptr);
228 	}
229 }
230 #else
231 #define check_cpu_slb_size(node) do { } while(0)
232 #endif
233 
234 static struct feature_property {
235 	const char *name;
236 	u32 min_value;
237 	unsigned long cpu_feature;
238 	unsigned long cpu_user_ftr;
239 } feature_properties[] __initdata = {
240 #ifdef CONFIG_ALTIVEC
241 	{"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
242 	{"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
243 #endif /* CONFIG_ALTIVEC */
244 #ifdef CONFIG_VSX
245 	/* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
246 	{"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
247 #endif /* CONFIG_VSX */
248 #ifdef CONFIG_PPC64
249 	{"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
250 	{"ibm,purr", 1, CPU_FTR_PURR, 0},
251 	{"ibm,spurr", 1, CPU_FTR_SPURR, 0},
252 #endif /* CONFIG_PPC64 */
253 };
254 
255 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
256 static inline void identical_pvr_fixup(unsigned long node)
257 {
258 	unsigned int pvr;
259 	char *model = of_get_flat_dt_prop(node, "model", NULL);
260 
261 	/*
262 	 * Since 440GR(x)/440EP(x) processors have the same pvr,
263 	 * we check the node path and set bit 28 in the cur_cpu_spec
264 	 * pvr for EP(x) processor version. This bit is always 0 in
265 	 * the "real" pvr. Then we call identify_cpu again with
266 	 * the new logical pvr to enable FPU support.
267 	 */
268 	if (model && strstr(model, "440EP")) {
269 		pvr = cur_cpu_spec->pvr_value | 0x8;
270 		identify_cpu(0, pvr);
271 		DBG("Using logical pvr %x for %s\n", pvr, model);
272 	}
273 }
274 #else
275 #define identical_pvr_fixup(node) do { } while(0)
276 #endif
277 
278 static void __init check_cpu_feature_properties(unsigned long node)
279 {
280 	unsigned long i;
281 	struct feature_property *fp = feature_properties;
282 	const __be32 *prop;
283 
284 	for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
285 		prop = of_get_flat_dt_prop(node, fp->name, NULL);
286 		if (prop && be32_to_cpup(prop) >= fp->min_value) {
287 			cur_cpu_spec->cpu_features |= fp->cpu_feature;
288 			cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
289 		}
290 	}
291 }
292 
293 static int __init early_init_dt_scan_cpus(unsigned long node,
294 					  const char *uname, int depth,
295 					  void *data)
296 {
297 	char *type = of_get_flat_dt_prop(node, "device_type", NULL);
298 	const __be32 *prop;
299 	const __be32 *intserv;
300 	int i, nthreads;
301 	unsigned long len;
302 	int found = -1;
303 	int found_thread = 0;
304 
305 	/* We are scanning "cpu" nodes only */
306 	if (type == NULL || strcmp(type, "cpu") != 0)
307 		return 0;
308 
309 	/* Get physical cpuid */
310 	intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
311 	if (intserv) {
312 		nthreads = len / sizeof(int);
313 	} else {
314 		intserv = of_get_flat_dt_prop(node, "reg", NULL);
315 		nthreads = 1;
316 	}
317 
318 	/*
319 	 * Now see if any of these threads match our boot cpu.
320 	 * NOTE: This must match the parsing done in smp_setup_cpu_maps.
321 	 */
322 	for (i = 0; i < nthreads; i++) {
323 		/*
324 		 * version 2 of the kexec param format adds the phys cpuid of
325 		 * booted proc.
326 		 */
327 		if (be32_to_cpu(initial_boot_params->version) >= 2) {
328 			if (be32_to_cpu(intserv[i]) ==
329 			    be32_to_cpu(initial_boot_params->boot_cpuid_phys)) {
330 				found = boot_cpu_count;
331 				found_thread = i;
332 			}
333 		} else {
334 			/*
335 			 * Check if it's the boot-cpu, set it's hw index now,
336 			 * unfortunately this format did not support booting
337 			 * off secondary threads.
338 			 */
339 			if (of_get_flat_dt_prop(node,
340 					"linux,boot-cpu", NULL) != NULL)
341 				found = boot_cpu_count;
342 		}
343 #ifdef CONFIG_SMP
344 		/* logical cpu id is always 0 on UP kernels */
345 		boot_cpu_count++;
346 #endif
347 	}
348 
349 	if (found >= 0) {
350 		DBG("boot cpu: logical %d physical %d\n", found,
351 			be32_to_cpu(intserv[found_thread]));
352 		boot_cpuid = found;
353 		set_hard_smp_processor_id(found,
354 			be32_to_cpu(intserv[found_thread]));
355 
356 		/*
357 		 * PAPR defines "logical" PVR values for cpus that
358 		 * meet various levels of the architecture:
359 		 * 0x0f000001	Architecture version 2.04
360 		 * 0x0f000002	Architecture version 2.05
361 		 * If the cpu-version property in the cpu node contains
362 		 * such a value, we call identify_cpu again with the
363 		 * logical PVR value in order to use the cpu feature
364 		 * bits appropriate for the architecture level.
365 		 *
366 		 * A POWER6 partition in "POWER6 architected" mode
367 		 * uses the 0x0f000002 PVR value; in POWER5+ mode
368 		 * it uses 0x0f000001.
369 		 */
370 		prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
371 		if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
372 			identify_cpu(0, be32_to_cpup(prop));
373 
374 		identical_pvr_fixup(node);
375 	}
376 
377 	check_cpu_feature_properties(node);
378 	check_cpu_pa_features(node);
379 	check_cpu_slb_size(node);
380 
381 #ifdef CONFIG_PPC_PSERIES
382 	if (nthreads > 1)
383 		cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
384 	else
385 		cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
386 #endif
387 
388 	return 0;
389 }
390 
391 int __init early_init_dt_scan_chosen_ppc(unsigned long node, const char *uname,
392 					 int depth, void *data)
393 {
394 	unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
395 
396 	/* Use common scan routine to determine if this is the chosen node */
397 	if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
398 		return 0;
399 
400 #ifdef CONFIG_PPC64
401 	/* check if iommu is forced on or off */
402 	if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
403 		iommu_is_off = 1;
404 	if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
405 		iommu_force_on = 1;
406 #endif
407 
408 	/* mem=x on the command line is the preferred mechanism */
409 	lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
410 	if (lprop)
411 		memory_limit = *lprop;
412 
413 #ifdef CONFIG_PPC64
414 	lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
415 	if (lprop)
416 		tce_alloc_start = *lprop;
417 	lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
418 	if (lprop)
419 		tce_alloc_end = *lprop;
420 #endif
421 
422 #ifdef CONFIG_KEXEC
423 	lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
424 	if (lprop)
425 		crashk_res.start = *lprop;
426 
427 	lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
428 	if (lprop)
429 		crashk_res.end = crashk_res.start + *lprop - 1;
430 #endif
431 
432 	/* break now */
433 	return 1;
434 }
435 
436 #ifdef CONFIG_PPC_PSERIES
437 /*
438  * Interpret the ibm,dynamic-memory property in the
439  * /ibm,dynamic-reconfiguration-memory node.
440  * This contains a list of memory blocks along with NUMA affinity
441  * information.
442  */
443 static int __init early_init_dt_scan_drconf_memory(unsigned long node)
444 {
445 	__be32 *dm, *ls, *usm;
446 	unsigned long l, n, flags;
447 	u64 base, size, memblock_size;
448 	unsigned int is_kexec_kdump = 0, rngs;
449 
450 	ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
451 	if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
452 		return 0;
453 	memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
454 
455 	dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
456 	if (dm == NULL || l < sizeof(__be32))
457 		return 0;
458 
459 	n = of_read_number(dm++, 1);	/* number of entries */
460 	if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
461 		return 0;
462 
463 	/* check if this is a kexec/kdump kernel. */
464 	usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
465 						 &l);
466 	if (usm != NULL)
467 		is_kexec_kdump = 1;
468 
469 	for (; n != 0; --n) {
470 		base = dt_mem_next_cell(dt_root_addr_cells, &dm);
471 		flags = of_read_number(&dm[3], 1);
472 		/* skip DRC index, pad, assoc. list index, flags */
473 		dm += 4;
474 		/* skip this block if the reserved bit is set in flags (0x80)
475 		   or if the block is not assigned to this partition (0x8) */
476 		if ((flags & 0x80) || !(flags & 0x8))
477 			continue;
478 		size = memblock_size;
479 		rngs = 1;
480 		if (is_kexec_kdump) {
481 			/*
482 			 * For each memblock in ibm,dynamic-memory, a corresponding
483 			 * entry in linux,drconf-usable-memory property contains
484 			 * a counter 'p' followed by 'p' (base, size) duple.
485 			 * Now read the counter from
486 			 * linux,drconf-usable-memory property
487 			 */
488 			rngs = dt_mem_next_cell(dt_root_size_cells, &usm);
489 			if (!rngs) /* there are no (base, size) duple */
490 				continue;
491 		}
492 		do {
493 			if (is_kexec_kdump) {
494 				base = dt_mem_next_cell(dt_root_addr_cells,
495 							 &usm);
496 				size = dt_mem_next_cell(dt_root_size_cells,
497 							 &usm);
498 			}
499 			if (iommu_is_off) {
500 				if (base >= 0x80000000ul)
501 					continue;
502 				if ((base + size) > 0x80000000ul)
503 					size = 0x80000000ul - base;
504 			}
505 			memblock_add(base, size);
506 		} while (--rngs);
507 	}
508 	memblock_dump_all();
509 	return 0;
510 }
511 #else
512 #define early_init_dt_scan_drconf_memory(node)	0
513 #endif /* CONFIG_PPC_PSERIES */
514 
515 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
516 						const char *uname,
517 						int depth, void *data)
518 {
519 	if (depth == 1 &&
520 	    strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
521 		return early_init_dt_scan_drconf_memory(node);
522 
523 	return early_init_dt_scan_memory(node, uname, depth, data);
524 }
525 
526 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
527 {
528 #ifdef CONFIG_PPC64
529 	if (iommu_is_off) {
530 		if (base >= 0x80000000ul)
531 			return;
532 		if ((base + size) > 0x80000000ul)
533 			size = 0x80000000ul - base;
534 	}
535 #endif
536 	/* Keep track of the beginning of memory -and- the size of
537 	 * the very first block in the device-tree as it represents
538 	 * the RMA on ppc64 server
539 	 */
540 	if (base < memstart_addr) {
541 		memstart_addr = base;
542 		first_memblock_size = size;
543 	}
544 
545 	/* Add the chunk to the MEMBLOCK list */
546 	memblock_add(base, size);
547 }
548 
549 static void __init early_reserve_mem_dt(void)
550 {
551 	unsigned long i, len, dt_root;
552 	const __be32 *prop;
553 
554 	dt_root = of_get_flat_dt_root();
555 
556 	prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
557 
558 	if (!prop)
559 		return;
560 
561 	DBG("Found new-style reserved-ranges\n");
562 
563 	/* Each reserved range is an (address,size) pair, 2 cells each,
564 	 * totalling 4 cells per range. */
565 	for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
566 		u64 base, size;
567 
568 		base = of_read_number(prop + (i * 4) + 0, 2);
569 		size = of_read_number(prop + (i * 4) + 2, 2);
570 
571 		if (size) {
572 			DBG("reserving: %llx -> %llx\n", base, size);
573 			memblock_reserve(base, size);
574 		}
575 	}
576 }
577 
578 static void __init early_reserve_mem(void)
579 {
580 	u64 base, size;
581 	__be64 *reserve_map;
582 	unsigned long self_base;
583 	unsigned long self_size;
584 
585 	reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
586 			be32_to_cpu(initial_boot_params->off_mem_rsvmap));
587 
588 	/* before we do anything, lets reserve the dt blob */
589 	self_base = __pa((unsigned long)initial_boot_params);
590 	self_size = be32_to_cpu(initial_boot_params->totalsize);
591 	memblock_reserve(self_base, self_size);
592 
593 	/* Look for the new "reserved-regions" property in the DT */
594 	early_reserve_mem_dt();
595 
596 #ifdef CONFIG_BLK_DEV_INITRD
597 	/* Then reserve the initrd, if any */
598 	if (initrd_start && (initrd_end > initrd_start)) {
599 		memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
600 			_ALIGN_UP(initrd_end, PAGE_SIZE) -
601 			_ALIGN_DOWN(initrd_start, PAGE_SIZE));
602 	}
603 #endif /* CONFIG_BLK_DEV_INITRD */
604 
605 #ifdef CONFIG_PPC32
606 	/*
607 	 * Handle the case where we might be booting from an old kexec
608 	 * image that setup the mem_rsvmap as pairs of 32-bit values
609 	 */
610 	if (be64_to_cpup(reserve_map) > 0xffffffffull) {
611 		u32 base_32, size_32;
612 		__be32 *reserve_map_32 = (__be32 *)reserve_map;
613 
614 		DBG("Found old 32-bit reserve map\n");
615 
616 		while (1) {
617 			base_32 = be32_to_cpup(reserve_map_32++);
618 			size_32 = be32_to_cpup(reserve_map_32++);
619 			if (size_32 == 0)
620 				break;
621 			/* skip if the reservation is for the blob */
622 			if (base_32 == self_base && size_32 == self_size)
623 				continue;
624 			DBG("reserving: %x -> %x\n", base_32, size_32);
625 			memblock_reserve(base_32, size_32);
626 		}
627 		return;
628 	}
629 #endif
630 	DBG("Processing reserve map\n");
631 
632 	/* Handle the reserve map in the fdt blob if it exists */
633 	while (1) {
634 		base = be64_to_cpup(reserve_map++);
635 		size = be64_to_cpup(reserve_map++);
636 		if (size == 0)
637 			break;
638 		DBG("reserving: %llx -> %llx\n", base, size);
639 		memblock_reserve(base, size);
640 	}
641 }
642 
643 void __init early_init_devtree(void *params)
644 {
645 	phys_addr_t limit;
646 
647 	DBG(" -> early_init_devtree(%p)\n", params);
648 
649 	/* Setup flat device-tree pointer */
650 	initial_boot_params = params;
651 
652 #ifdef CONFIG_PPC_RTAS
653 	/* Some machines might need RTAS info for debugging, grab it now. */
654 	of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
655 #endif
656 
657 #ifdef CONFIG_PPC_POWERNV
658 	/* Some machines might need OPAL info for debugging, grab it now. */
659 	of_scan_flat_dt(early_init_dt_scan_opal, NULL);
660 #endif
661 
662 #ifdef CONFIG_FA_DUMP
663 	/* scan tree to see if dump is active during last boot */
664 	of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
665 #endif
666 
667 	/* Pre-initialize the cmd_line with the content of boot_commmand_line,
668 	 * which will be empty except when the content of the variable has
669 	 * been overriden by a bootloading mechanism. This happens typically
670 	 * with HAL takeover
671 	 */
672 	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
673 
674 	/* Retrieve various informations from the /chosen node of the
675 	 * device-tree, including the platform type, initrd location and
676 	 * size, TCE reserve, and more ...
677 	 */
678 	of_scan_flat_dt(early_init_dt_scan_chosen_ppc, cmd_line);
679 
680 	/* Scan memory nodes and rebuild MEMBLOCKs */
681 	of_scan_flat_dt(early_init_dt_scan_root, NULL);
682 	of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
683 
684 	/* Save command line for /proc/cmdline and then parse parameters */
685 	strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
686 	parse_early_param();
687 
688 	/* make sure we've parsed cmdline for mem= before this */
689 	if (memory_limit)
690 		first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
691 	setup_initial_memory_limit(memstart_addr, first_memblock_size);
692 	/* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
693 	memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
694 	/* If relocatable, reserve first 32k for interrupt vectors etc. */
695 	if (PHYSICAL_START > MEMORY_START)
696 		memblock_reserve(MEMORY_START, 0x8000);
697 	reserve_kdump_trampoline();
698 #ifdef CONFIG_FA_DUMP
699 	/*
700 	 * If we fail to reserve memory for firmware-assisted dump then
701 	 * fallback to kexec based kdump.
702 	 */
703 	if (fadump_reserve_mem() == 0)
704 #endif
705 		reserve_crashkernel();
706 	early_reserve_mem();
707 
708 	/*
709 	 * Ensure that total memory size is page-aligned, because otherwise
710 	 * mark_bootmem() gets upset.
711 	 */
712 	limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
713 	memblock_enforce_memory_limit(limit);
714 
715 	memblock_allow_resize();
716 	memblock_dump_all();
717 
718 	DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
719 
720 	/* We may need to relocate the flat tree, do it now.
721 	 * FIXME .. and the initrd too? */
722 	move_device_tree();
723 
724 	allocate_pacas();
725 
726 	DBG("Scanning CPUs ...\n");
727 
728 	/* Retrieve CPU related informations from the flat tree
729 	 * (altivec support, boot CPU ID, ...)
730 	 */
731 	of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
732 
733 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
734 	/* We'll later wait for secondaries to check in; there are
735 	 * NCPUS-1 non-boot CPUs  :-)
736 	 */
737 	spinning_secondaries = boot_cpu_count - 1;
738 #endif
739 
740 	DBG(" <- early_init_devtree()\n");
741 }
742 
743 /*******
744  *
745  * New implementation of the OF "find" APIs, return a refcounted
746  * object, call of_node_put() when done.  The device tree and list
747  * are protected by a rw_lock.
748  *
749  * Note that property management will need some locking as well,
750  * this isn't dealt with yet.
751  *
752  *******/
753 
754 /**
755  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
756  * @np: device node of the device
757  *
758  * This looks for a property "ibm,chip-id" in the node or any
759  * of its parents and returns its content, or -1 if it cannot
760  * be found.
761  */
762 int of_get_ibm_chip_id(struct device_node *np)
763 {
764 	of_node_get(np);
765 	while(np) {
766 		struct device_node *old = np;
767 		const __be32 *prop;
768 
769 		prop = of_get_property(np, "ibm,chip-id", NULL);
770 		if (prop) {
771 			of_node_put(np);
772 			return be32_to_cpup(prop);
773 		}
774 		np = of_get_parent(np);
775 		of_node_put(old);
776 	}
777 	return -1;
778 }
779 
780 /**
781  * cpu_to_chip_id - Return the cpus chip-id
782  * @cpu: The logical cpu number.
783  *
784  * Return the value of the ibm,chip-id property corresponding to the given
785  * logical cpu number. If the chip-id can not be found, returns -1.
786  */
787 int cpu_to_chip_id(int cpu)
788 {
789 	struct device_node *np;
790 
791 	np = of_get_cpu_node(cpu, NULL);
792 	if (!np)
793 		return -1;
794 
795 	of_node_put(np);
796 	return of_get_ibm_chip_id(np);
797 }
798 EXPORT_SYMBOL(cpu_to_chip_id);
799 
800 #ifdef CONFIG_PPC_PSERIES
801 /*
802  * Fix up the uninitialized fields in a new device node:
803  * name, type and pci-specific fields
804  */
805 
806 static int of_finish_dynamic_node(struct device_node *node)
807 {
808 	struct device_node *parent = of_get_parent(node);
809 	int err = 0;
810 	const phandle *ibm_phandle;
811 
812 	node->name = of_get_property(node, "name", NULL);
813 	node->type = of_get_property(node, "device_type", NULL);
814 
815 	if (!node->name)
816 		node->name = "<NULL>";
817 	if (!node->type)
818 		node->type = "<NULL>";
819 
820 	if (!parent) {
821 		err = -ENODEV;
822 		goto out;
823 	}
824 
825 	/* We don't support that function on PowerMac, at least
826 	 * not yet
827 	 */
828 	if (machine_is(powermac))
829 		return -ENODEV;
830 
831 	/* fix up new node's phandle field */
832 	if ((ibm_phandle = of_get_property(node, "ibm,phandle", NULL)))
833 		node->phandle = *ibm_phandle;
834 
835 out:
836 	of_node_put(parent);
837 	return err;
838 }
839 
840 static int prom_reconfig_notifier(struct notifier_block *nb,
841 				  unsigned long action, void *node)
842 {
843 	int err;
844 
845 	switch (action) {
846 	case OF_RECONFIG_ATTACH_NODE:
847 		err = of_finish_dynamic_node(node);
848 		if (err < 0)
849 			printk(KERN_ERR "finish_node returned %d\n", err);
850 		break;
851 	default:
852 		err = 0;
853 		break;
854 	}
855 	return notifier_from_errno(err);
856 }
857 
858 static struct notifier_block prom_reconfig_nb = {
859 	.notifier_call = prom_reconfig_notifier,
860 	.priority = 10, /* This one needs to run first */
861 };
862 
863 static int __init prom_reconfig_setup(void)
864 {
865 	return of_reconfig_notifier_register(&prom_reconfig_nb);
866 }
867 __initcall(prom_reconfig_setup);
868 #endif
869 
870 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
871 {
872 	return (int)phys_id == get_hard_smp_processor_id(cpu);
873 }
874 
875 #if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
876 static struct debugfs_blob_wrapper flat_dt_blob;
877 
878 static int __init export_flat_device_tree(void)
879 {
880 	struct dentry *d;
881 
882 	flat_dt_blob.data = initial_boot_params;
883 	flat_dt_blob.size = be32_to_cpu(initial_boot_params->totalsize);
884 
885 	d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
886 				powerpc_debugfs_root, &flat_dt_blob);
887 	if (!d)
888 		return 1;
889 
890 	return 0;
891 }
892 __initcall(export_flat_device_tree);
893 #endif
894