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TOMOYO Linux Cross Reference
Linux/arch/powerpc/kernel/prom.c

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  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/delay.h>
 27 #include <linux/initrd.h>
 28 #include <linux/bitops.h>
 29 #include <linux/export.h>
 30 #include <linux/kexec.h>
 31 #include <linux/irq.h>
 32 #include <linux/memblock.h>
 33 #include <linux/of.h>
 34 #include <linux/of_fdt.h>
 35 #include <linux/libfdt.h>
 36 #include <linux/cpu.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/powernv.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/epapr_hcalls.h>
 59 #include <asm/firmware.h>
 60 #include <asm/dt_cpu_ftrs.h>
 61 #include <asm/drmem.h>
 62 
 63 #include <mm/mmu_decl.h>
 64 
 65 #ifdef DEBUG
 66 #define DBG(fmt...) printk(KERN_ERR fmt)
 67 #else
 68 #define DBG(fmt...)
 69 #endif
 70 
 71 #ifdef CONFIG_PPC64
 72 int __initdata iommu_is_off;
 73 int __initdata iommu_force_on;
 74 unsigned long tce_alloc_start, tce_alloc_end;
 75 u64 ppc64_rma_size;
 76 #endif
 77 static phys_addr_t first_memblock_size;
 78 static int __initdata boot_cpu_count;
 79 
 80 static int __init early_parse_mem(char *p)
 81 {
 82         if (!p)
 83                 return 1;
 84 
 85         memory_limit = PAGE_ALIGN(memparse(p, &p));
 86         DBG("memory limit = 0x%llx\n", memory_limit);
 87 
 88         return 0;
 89 }
 90 early_param("mem", early_parse_mem);
 91 
 92 /*
 93  * overlaps_initrd - check for overlap with page aligned extension of
 94  * initrd.
 95  */
 96 static inline int overlaps_initrd(unsigned long start, unsigned long size)
 97 {
 98 #ifdef CONFIG_BLK_DEV_INITRD
 99         if (!initrd_start)
100                 return 0;
101 
102         return  (start + size) > _ALIGN_DOWN(initrd_start, PAGE_SIZE) &&
103                         start <= _ALIGN_UP(initrd_end, PAGE_SIZE);
104 #else
105         return 0;
106 #endif
107 }
108 
109 /**
110  * move_device_tree - move tree to an unused area, if needed.
111  *
112  * The device tree may be allocated beyond our memory limit, or inside the
113  * crash kernel region for kdump, or within the page aligned range of initrd.
114  * If so, move it out of the way.
115  */
116 static void __init move_device_tree(void)
117 {
118         unsigned long start, size;
119         void *p;
120 
121         DBG("-> move_device_tree\n");
122 
123         start = __pa(initial_boot_params);
124         size = fdt_totalsize(initial_boot_params);
125 
126         if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
127                         overlaps_crashkernel(start, size) ||
128                         overlaps_initrd(start, size)) {
129                 p = __va(memblock_phys_alloc(size, PAGE_SIZE));
130                 memcpy(p, initial_boot_params, size);
131                 initial_boot_params = p;
132                 DBG("Moved device tree to 0x%p\n", p);
133         }
134 
135         DBG("<- move_device_tree\n");
136 }
137 
138 /*
139  * ibm,pa-features is a per-cpu property that contains a string of
140  * attribute descriptors, each of which has a 2 byte header plus up
141  * to 254 bytes worth of processor attribute bits.  First header
142  * byte specifies the number of bytes following the header.
143  * Second header byte is an "attribute-specifier" type, of which
144  * zero is the only currently-defined value.
145  * Implementation:  Pass in the byte and bit offset for the feature
146  * that we are interested in.  The function will return -1 if the
147  * pa-features property is missing, or a 1/0 to indicate if the feature
148  * is supported/not supported.  Note that the bit numbers are
149  * big-endian to match the definition in PAPR.
150  */
151 static struct ibm_pa_feature {
152         unsigned long   cpu_features;   /* CPU_FTR_xxx bit */
153         unsigned long   mmu_features;   /* MMU_FTR_xxx bit */
154         unsigned int    cpu_user_ftrs;  /* PPC_FEATURE_xxx bit */
155         unsigned int    cpu_user_ftrs2; /* PPC_FEATURE2_xxx bit */
156         unsigned char   pabyte;         /* byte number in ibm,pa-features */
157         unsigned char   pabit;          /* bit number (big-endian) */
158         unsigned char   invert;         /* if 1, pa bit set => clear feature */
159 } ibm_pa_features[] __initdata = {
160         { .pabyte = 0,  .pabit = 0, .cpu_user_ftrs = PPC_FEATURE_HAS_MMU },
161         { .pabyte = 0,  .pabit = 1, .cpu_user_ftrs = PPC_FEATURE_HAS_FPU },
162         { .pabyte = 0,  .pabit = 3, .cpu_features  = CPU_FTR_CTRL },
163         { .pabyte = 0,  .pabit = 6, .cpu_features  = CPU_FTR_NOEXECUTE },
164         { .pabyte = 1,  .pabit = 2, .mmu_features  = MMU_FTR_CI_LARGE_PAGE },
165 #ifdef CONFIG_PPC_RADIX_MMU
166         { .pabyte = 40, .pabit = 0, .mmu_features  = MMU_FTR_TYPE_RADIX },
167 #endif
168         { .pabyte = 1,  .pabit = 1, .invert = 1, .cpu_features = CPU_FTR_NODSISRALIGN },
169         { .pabyte = 5,  .pabit = 0, .cpu_features  = CPU_FTR_REAL_LE,
170                                     .cpu_user_ftrs = PPC_FEATURE_TRUE_LE },
171         /*
172          * If the kernel doesn't support TM (ie CONFIG_PPC_TRANSACTIONAL_MEM=n),
173          * we don't want to turn on TM here, so we use the *_COMP versions
174          * which are 0 if the kernel doesn't support TM.
175          */
176         { .pabyte = 22, .pabit = 0, .cpu_features = CPU_FTR_TM_COMP,
177           .cpu_user_ftrs2 = PPC_FEATURE2_HTM_COMP | PPC_FEATURE2_HTM_NOSC_COMP },
178 };
179 
180 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
181                                  unsigned long tablelen,
182                                  struct ibm_pa_feature *fp,
183                                  unsigned long ft_size)
184 {
185         unsigned long i, len, bit;
186 
187         /* find descriptor with type == 0 */
188         for (;;) {
189                 if (tablelen < 3)
190                         return;
191                 len = 2 + ftrs[0];
192                 if (tablelen < len)
193                         return;         /* descriptor 0 not found */
194                 if (ftrs[1] == 0)
195                         break;
196                 tablelen -= len;
197                 ftrs += len;
198         }
199 
200         /* loop over bits we know about */
201         for (i = 0; i < ft_size; ++i, ++fp) {
202                 if (fp->pabyte >= ftrs[0])
203                         continue;
204                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
205                 if (bit ^ fp->invert) {
206                         cur_cpu_spec->cpu_features |= fp->cpu_features;
207                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftrs;
208                         cur_cpu_spec->cpu_user_features2 |= fp->cpu_user_ftrs2;
209                         cur_cpu_spec->mmu_features |= fp->mmu_features;
210                 } else {
211                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
212                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
213                         cur_cpu_spec->cpu_user_features2 &= ~fp->cpu_user_ftrs2;
214                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
215                 }
216         }
217 }
218 
219 static void __init check_cpu_pa_features(unsigned long node)
220 {
221         const unsigned char *pa_ftrs;
222         int tablelen;
223 
224         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
225         if (pa_ftrs == NULL)
226                 return;
227 
228         scan_features(node, pa_ftrs, tablelen,
229                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
230 }
231 
232 #ifdef CONFIG_PPC_BOOK3S_64
233 static void __init init_mmu_slb_size(unsigned long node)
234 {
235         const __be32 *slb_size_ptr;
236 
237         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
238                         of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
239 
240         if (slb_size_ptr)
241                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
242 }
243 #else
244 #define init_mmu_slb_size(node) do { } while(0)
245 #endif
246 
247 static struct feature_property {
248         const char *name;
249         u32 min_value;
250         unsigned long cpu_feature;
251         unsigned long cpu_user_ftr;
252 } feature_properties[] __initdata = {
253 #ifdef CONFIG_ALTIVEC
254         {"altivec", 0, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
255         {"ibm,vmx", 1, CPU_FTR_ALTIVEC, PPC_FEATURE_HAS_ALTIVEC},
256 #endif /* CONFIG_ALTIVEC */
257 #ifdef CONFIG_VSX
258         /* Yes, this _really_ is ibm,vmx == 2 to enable VSX */
259         {"ibm,vmx", 2, CPU_FTR_VSX, PPC_FEATURE_HAS_VSX},
260 #endif /* CONFIG_VSX */
261 #ifdef CONFIG_PPC64
262         {"ibm,dfp", 1, 0, PPC_FEATURE_HAS_DFP},
263         {"ibm,purr", 1, CPU_FTR_PURR, 0},
264         {"ibm,spurr", 1, CPU_FTR_SPURR, 0},
265 #endif /* CONFIG_PPC64 */
266 };
267 
268 #if defined(CONFIG_44x) && defined(CONFIG_PPC_FPU)
269 static inline void identical_pvr_fixup(unsigned long node)
270 {
271         unsigned int pvr;
272         const char *model = of_get_flat_dt_prop(node, "model", NULL);
273 
274         /*
275          * Since 440GR(x)/440EP(x) processors have the same pvr,
276          * we check the node path and set bit 28 in the cur_cpu_spec
277          * pvr for EP(x) processor version. This bit is always 0 in
278          * the "real" pvr. Then we call identify_cpu again with
279          * the new logical pvr to enable FPU support.
280          */
281         if (model && strstr(model, "440EP")) {
282                 pvr = cur_cpu_spec->pvr_value | 0x8;
283                 identify_cpu(0, pvr);
284                 DBG("Using logical pvr %x for %s\n", pvr, model);
285         }
286 }
287 #else
288 #define identical_pvr_fixup(node) do { } while(0)
289 #endif
290 
291 static void __init check_cpu_feature_properties(unsigned long node)
292 {
293         int i;
294         struct feature_property *fp = feature_properties;
295         const __be32 *prop;
296 
297         for (i = 0; i < (int)ARRAY_SIZE(feature_properties); ++i, ++fp) {
298                 prop = of_get_flat_dt_prop(node, fp->name, NULL);
299                 if (prop && be32_to_cpup(prop) >= fp->min_value) {
300                         cur_cpu_spec->cpu_features |= fp->cpu_feature;
301                         cur_cpu_spec->cpu_user_features |= fp->cpu_user_ftr;
302                 }
303         }
304 }
305 
306 static int __init early_init_dt_scan_cpus(unsigned long node,
307                                           const char *uname, int depth,
308                                           void *data)
309 {
310         const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
311         const __be32 *prop;
312         const __be32 *intserv;
313         int i, nthreads;
314         int len;
315         int found = -1;
316         int found_thread = 0;
317 
318         /* We are scanning "cpu" nodes only */
319         if (type == NULL || strcmp(type, "cpu") != 0)
320                 return 0;
321 
322         /* Get physical cpuid */
323         intserv = of_get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s", &len);
324         if (!intserv)
325                 intserv = of_get_flat_dt_prop(node, "reg", &len);
326 
327         nthreads = len / sizeof(int);
328 
329         /*
330          * Now see if any of these threads match our boot cpu.
331          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
332          */
333         for (i = 0; i < nthreads; i++) {
334                 if (be32_to_cpu(intserv[i]) ==
335                         fdt_boot_cpuid_phys(initial_boot_params)) {
336                         found = boot_cpu_count;
337                         found_thread = i;
338                 }
339 #ifdef CONFIG_SMP
340                 /* logical cpu id is always 0 on UP kernels */
341                 boot_cpu_count++;
342 #endif
343         }
344 
345         /* Not the boot CPU */
346         if (found < 0)
347                 return 0;
348 
349         DBG("boot cpu: logical %d physical %d\n", found,
350             be32_to_cpu(intserv[found_thread]));
351         boot_cpuid = found;
352 
353         /*
354          * PAPR defines "logical" PVR values for cpus that
355          * meet various levels of the architecture:
356          * 0x0f000001   Architecture version 2.04
357          * 0x0f000002   Architecture version 2.05
358          * If the cpu-version property in the cpu node contains
359          * such a value, we call identify_cpu again with the
360          * logical PVR value in order to use the cpu feature
361          * bits appropriate for the architecture level.
362          *
363          * A POWER6 partition in "POWER6 architected" mode
364          * uses the 0x0f000002 PVR value; in POWER5+ mode
365          * it uses 0x0f000001.
366          *
367          * If we're using device tree CPU feature discovery then we don't
368          * support the cpu-version property, and it's the responsibility of the
369          * firmware/hypervisor to provide the correct feature set for the
370          * architecture level via the ibm,powerpc-cpu-features binding.
371          */
372         if (!dt_cpu_ftrs_in_use()) {
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                 check_cpu_feature_properties(node);
378                 check_cpu_pa_features(node);
379         }
380 
381         identical_pvr_fixup(node);
382         init_mmu_slb_size(node);
383 
384 #ifdef CONFIG_PPC64
385         if (nthreads == 1)
386                 cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
387         else if (!dt_cpu_ftrs_in_use())
388                 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
389         allocate_paca(boot_cpuid);
390 #endif
391         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
392 
393         return 0;
394 }
395 
396 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
397                                                 const char *uname,
398                                                 int depth, void *data)
399 {
400         const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
401 
402         /* Use common scan routine to determine if this is the chosen node */
403         if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
404                 return 0;
405 
406 #ifdef CONFIG_PPC64
407         /* check if iommu is forced on or off */
408         if (of_get_flat_dt_prop(node, "linux,iommu-off", NULL) != NULL)
409                 iommu_is_off = 1;
410         if (of_get_flat_dt_prop(node, "linux,iommu-force-on", NULL) != NULL)
411                 iommu_force_on = 1;
412 #endif
413 
414         /* mem=x on the command line is the preferred mechanism */
415         lprop = of_get_flat_dt_prop(node, "linux,memory-limit", NULL);
416         if (lprop)
417                 memory_limit = *lprop;
418 
419 #ifdef CONFIG_PPC64
420         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-start", NULL);
421         if (lprop)
422                 tce_alloc_start = *lprop;
423         lprop = of_get_flat_dt_prop(node, "linux,tce-alloc-end", NULL);
424         if (lprop)
425                 tce_alloc_end = *lprop;
426 #endif
427 
428 #ifdef CONFIG_KEXEC_CORE
429         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-base", NULL);
430         if (lprop)
431                 crashk_res.start = *lprop;
432 
433         lprop = of_get_flat_dt_prop(node, "linux,crashkernel-size", NULL);
434         if (lprop)
435                 crashk_res.end = crashk_res.start + *lprop - 1;
436 #endif
437 
438         /* break now */
439         return 1;
440 }
441 
442 /*
443  * Compare the range against max mem limit and update
444  * size if it cross the limit.
445  */
446 
447 #ifdef CONFIG_SPARSEMEM
448 static bool validate_mem_limit(u64 base, u64 *size)
449 {
450         u64 max_mem = 1UL << (MAX_PHYSMEM_BITS);
451 
452         if (base >= max_mem)
453                 return false;
454         if ((base + *size) > max_mem)
455                 *size = max_mem - base;
456         return true;
457 }
458 #else
459 static bool validate_mem_limit(u64 base, u64 *size)
460 {
461         return true;
462 }
463 #endif
464 
465 #ifdef CONFIG_PPC_PSERIES
466 /*
467  * Interpret the ibm dynamic reconfiguration memory LMBs.
468  * This contains a list of memory blocks along with NUMA affinity
469  * information.
470  */
471 static void __init early_init_drmem_lmb(struct drmem_lmb *lmb,
472                                         const __be32 **usm)
473 {
474         u64 base, size;
475         int is_kexec_kdump = 0, rngs;
476 
477         base = lmb->base_addr;
478         size = drmem_lmb_size();
479         rngs = 1;
480 
481         /*
482          * Skip this block if the reserved bit is set in flags
483          * or if the block is not assigned to this partition.
484          */
485         if ((lmb->flags & DRCONF_MEM_RESERVED) ||
486             !(lmb->flags & DRCONF_MEM_ASSIGNED))
487                 return;
488 
489         if (*usm)
490                 is_kexec_kdump = 1;
491 
492         if (is_kexec_kdump) {
493                 /*
494                  * For each memblock in ibm,dynamic-memory, a
495                  * corresponding entry in linux,drconf-usable-memory
496                  * property contains a counter 'p' followed by 'p'
497                  * (base, size) duple. Now read the counter from
498                  * linux,drconf-usable-memory property
499                  */
500                 rngs = dt_mem_next_cell(dt_root_size_cells, usm);
501                 if (!rngs) /* there are no (base, size) duple */
502                         return;
503         }
504 
505         do {
506                 if (is_kexec_kdump) {
507                         base = dt_mem_next_cell(dt_root_addr_cells, usm);
508                         size = dt_mem_next_cell(dt_root_size_cells, usm);
509                 }
510 
511                 if (iommu_is_off) {
512                         if (base >= 0x80000000ul)
513                                 continue;
514                         if ((base + size) > 0x80000000ul)
515                                 size = 0x80000000ul - base;
516                 }
517 
518                 DBG("Adding: %llx -> %llx\n", base, size);
519                 if (validate_mem_limit(base, &size))
520                         memblock_add(base, size);
521         } while (--rngs);
522 }
523 #endif /* CONFIG_PPC_PSERIES */
524 
525 static int __init early_init_dt_scan_memory_ppc(unsigned long node,
526                                                 const char *uname,
527                                                 int depth, void *data)
528 {
529 #ifdef CONFIG_PPC_PSERIES
530         if (depth == 1 &&
531             strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
532                 walk_drmem_lmbs_early(node, early_init_drmem_lmb);
533                 return 0;
534         }
535 #endif
536         
537         return early_init_dt_scan_memory(node, uname, depth, data);
538 }
539 
540 /*
541  * For a relocatable kernel, we need to get the memstart_addr first,
542  * then use it to calculate the virtual kernel start address. This has
543  * to happen at a very early stage (before machine_init). In this case,
544  * we just want to get the memstart_address and would not like to mess the
545  * memblock at this stage. So introduce a variable to skip the memblock_add()
546  * for this reason.
547  */
548 #ifdef CONFIG_RELOCATABLE
549 static int add_mem_to_memblock = 1;
550 #else
551 #define add_mem_to_memblock 1
552 #endif
553 
554 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
555 {
556 #ifdef CONFIG_PPC64
557         if (iommu_is_off) {
558                 if (base >= 0x80000000ul)
559                         return;
560                 if ((base + size) > 0x80000000ul)
561                         size = 0x80000000ul - base;
562         }
563 #endif
564         /* Keep track of the beginning of memory -and- the size of
565          * the very first block in the device-tree as it represents
566          * the RMA on ppc64 server
567          */
568         if (base < memstart_addr) {
569                 memstart_addr = base;
570                 first_memblock_size = size;
571         }
572 
573         /* Add the chunk to the MEMBLOCK list */
574         if (add_mem_to_memblock) {
575                 if (validate_mem_limit(base, &size))
576                         memblock_add(base, size);
577         }
578 }
579 
580 static void __init early_reserve_mem_dt(void)
581 {
582         unsigned long i, dt_root;
583         int len;
584         const __be32 *prop;
585 
586         early_init_fdt_reserve_self();
587         early_init_fdt_scan_reserved_mem();
588 
589         dt_root = of_get_flat_dt_root();
590 
591         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
592 
593         if (!prop)
594                 return;
595 
596         DBG("Found new-style reserved-ranges\n");
597 
598         /* Each reserved range is an (address,size) pair, 2 cells each,
599          * totalling 4 cells per range. */
600         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
601                 u64 base, size;
602 
603                 base = of_read_number(prop + (i * 4) + 0, 2);
604                 size = of_read_number(prop + (i * 4) + 2, 2);
605 
606                 if (size) {
607                         DBG("reserving: %llx -> %llx\n", base, size);
608                         memblock_reserve(base, size);
609                 }
610         }
611 }
612 
613 static void __init early_reserve_mem(void)
614 {
615         __be64 *reserve_map;
616 
617         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
618                         fdt_off_mem_rsvmap(initial_boot_params));
619 
620         /* Look for the new "reserved-regions" property in the DT */
621         early_reserve_mem_dt();
622 
623 #ifdef CONFIG_BLK_DEV_INITRD
624         /* Then reserve the initrd, if any */
625         if (initrd_start && (initrd_end > initrd_start)) {
626                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
627                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
628                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
629         }
630 #endif /* CONFIG_BLK_DEV_INITRD */
631 
632 #ifdef CONFIG_PPC32
633         /* 
634          * Handle the case where we might be booting from an old kexec
635          * image that setup the mem_rsvmap as pairs of 32-bit values
636          */
637         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
638                 u32 base_32, size_32;
639                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
640 
641                 DBG("Found old 32-bit reserve map\n");
642 
643                 while (1) {
644                         base_32 = be32_to_cpup(reserve_map_32++);
645                         size_32 = be32_to_cpup(reserve_map_32++);
646                         if (size_32 == 0)
647                                 break;
648                         DBG("reserving: %x -> %x\n", base_32, size_32);
649                         memblock_reserve(base_32, size_32);
650                 }
651                 return;
652         }
653 #endif
654 }
655 
656 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
657 static bool tm_disabled __initdata;
658 
659 static int __init parse_ppc_tm(char *str)
660 {
661         bool res;
662 
663         if (kstrtobool(str, &res))
664                 return -EINVAL;
665 
666         tm_disabled = !res;
667 
668         return 0;
669 }
670 early_param("ppc_tm", parse_ppc_tm);
671 
672 static void __init tm_init(void)
673 {
674         if (tm_disabled) {
675                 pr_info("Disabling hardware transactional memory (HTM)\n");
676                 cur_cpu_spec->cpu_user_features2 &=
677                         ~(PPC_FEATURE2_HTM_NOSC | PPC_FEATURE2_HTM);
678                 cur_cpu_spec->cpu_features &= ~CPU_FTR_TM;
679                 return;
680         }
681 
682         pnv_tm_init();
683 }
684 #else
685 static void tm_init(void) { }
686 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
687 
688 void __init early_init_devtree(void *params)
689 {
690         phys_addr_t limit;
691 
692         DBG(" -> early_init_devtree(%p)\n", params);
693 
694         /* Too early to BUG_ON(), do it by hand */
695         if (!early_init_dt_verify(params))
696                 panic("BUG: Failed verifying flat device tree, bad version?");
697 
698 #ifdef CONFIG_PPC_RTAS
699         /* Some machines might need RTAS info for debugging, grab it now. */
700         of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
701 #endif
702 
703 #ifdef CONFIG_PPC_POWERNV
704         /* Some machines might need OPAL info for debugging, grab it now. */
705         of_scan_flat_dt(early_init_dt_scan_opal, NULL);
706 #endif
707 
708 #ifdef CONFIG_FA_DUMP
709         /* scan tree to see if dump is active during last boot */
710         of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
711 #endif
712 
713         /* Retrieve various informations from the /chosen node of the
714          * device-tree, including the platform type, initrd location and
715          * size, TCE reserve, and more ...
716          */
717         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
718 
719         /* Scan memory nodes and rebuild MEMBLOCKs */
720         of_scan_flat_dt(early_init_dt_scan_root, NULL);
721         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
722 
723         parse_early_param();
724 
725         /* make sure we've parsed cmdline for mem= before this */
726         if (memory_limit)
727                 first_memblock_size = min_t(u64, first_memblock_size, memory_limit);
728         setup_initial_memory_limit(memstart_addr, first_memblock_size);
729         /* Reserve MEMBLOCK regions used by kernel, initrd, dt, etc... */
730         memblock_reserve(PHYSICAL_START, __pa(klimit) - PHYSICAL_START);
731         /* If relocatable, reserve first 32k for interrupt vectors etc. */
732         if (PHYSICAL_START > MEMORY_START)
733                 memblock_reserve(MEMORY_START, 0x8000);
734         reserve_kdump_trampoline();
735 #ifdef CONFIG_FA_DUMP
736         /*
737          * If we fail to reserve memory for firmware-assisted dump then
738          * fallback to kexec based kdump.
739          */
740         if (fadump_reserve_mem() == 0)
741 #endif
742                 reserve_crashkernel();
743         early_reserve_mem();
744 
745         /* Ensure that total memory size is page-aligned. */
746         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
747         memblock_enforce_memory_limit(limit);
748 
749         memblock_allow_resize();
750         memblock_dump_all();
751 
752         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
753 
754         /* We may need to relocate the flat tree, do it now.
755          * FIXME .. and the initrd too? */
756         move_device_tree();
757 
758         allocate_paca_ptrs();
759 
760         DBG("Scanning CPUs ...\n");
761 
762         dt_cpu_ftrs_scan();
763 
764         /* Retrieve CPU related informations from the flat tree
765          * (altivec support, boot CPU ID, ...)
766          */
767         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
768         if (boot_cpuid < 0) {
769                 printk("Failed to identify boot CPU !\n");
770                 BUG();
771         }
772 
773 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
774         /* We'll later wait for secondaries to check in; there are
775          * NCPUS-1 non-boot CPUs  :-)
776          */
777         spinning_secondaries = boot_cpu_count - 1;
778 #endif
779 
780         mmu_early_init_devtree();
781 
782 #ifdef CONFIG_PPC_POWERNV
783         /* Scan and build the list of machine check recoverable ranges */
784         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
785 #endif
786         epapr_paravirt_early_init();
787 
788         /* Now try to figure out if we are running on LPAR and so on */
789         pseries_probe_fw_features();
790 
791 #ifdef CONFIG_PPC_PS3
792         /* Identify PS3 firmware */
793         if (of_flat_dt_is_compatible(of_get_flat_dt_root(), "sony,ps3"))
794                 powerpc_firmware_features |= FW_FEATURE_PS3_POSSIBLE;
795 #endif
796 
797         tm_init();
798 
799         DBG(" <- early_init_devtree()\n");
800 }
801 
802 #ifdef CONFIG_RELOCATABLE
803 /*
804  * This function run before early_init_devtree, so we have to init
805  * initial_boot_params.
806  */
807 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
808 {
809         /* Setup flat device-tree pointer */
810         initial_boot_params = params;
811 
812         /*
813          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
814          * mess the memblock.
815          */
816         add_mem_to_memblock = 0;
817         of_scan_flat_dt(early_init_dt_scan_root, NULL);
818         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
819         add_mem_to_memblock = 1;
820 
821         if (size)
822                 *size = first_memblock_size;
823 }
824 #endif
825 
826 /*******
827  *
828  * New implementation of the OF "find" APIs, return a refcounted
829  * object, call of_node_put() when done.  The device tree and list
830  * are protected by a rw_lock.
831  *
832  * Note that property management will need some locking as well,
833  * this isn't dealt with yet.
834  *
835  *******/
836 
837 /**
838  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
839  * @np: device node of the device
840  *
841  * This looks for a property "ibm,chip-id" in the node or any
842  * of its parents and returns its content, or -1 if it cannot
843  * be found.
844  */
845 int of_get_ibm_chip_id(struct device_node *np)
846 {
847         of_node_get(np);
848         while (np) {
849                 u32 chip_id;
850 
851                 /*
852                  * Skiboot may produce memory nodes that contain more than one
853                  * cell in chip-id, we only read the first one here.
854                  */
855                 if (!of_property_read_u32(np, "ibm,chip-id", &chip_id)) {
856                         of_node_put(np);
857                         return chip_id;
858                 }
859 
860                 np = of_get_next_parent(np);
861         }
862         return -1;
863 }
864 EXPORT_SYMBOL(of_get_ibm_chip_id);
865 
866 /**
867  * cpu_to_chip_id - Return the cpus chip-id
868  * @cpu: The logical cpu number.
869  *
870  * Return the value of the ibm,chip-id property corresponding to the given
871  * logical cpu number. If the chip-id can not be found, returns -1.
872  */
873 int cpu_to_chip_id(int cpu)
874 {
875         struct device_node *np;
876 
877         np = of_get_cpu_node(cpu, NULL);
878         if (!np)
879                 return -1;
880 
881         of_node_put(np);
882         return of_get_ibm_chip_id(np);
883 }
884 EXPORT_SYMBOL(cpu_to_chip_id);
885 
886 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
887 {
888 #ifdef CONFIG_SMP
889         /*
890          * Early firmware scanning must use this rather than
891          * get_hard_smp_processor_id because we don't have pacas allocated
892          * until memory topology is discovered.
893          */
894         if (cpu_to_phys_id != NULL)
895                 return (int)phys_id == cpu_to_phys_id[cpu];
896 #endif
897 
898         return (int)phys_id == get_hard_smp_processor_id(cpu);
899 }
900 

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