~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/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 = fdt_totalsize(initial_boot_params);
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 = 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         {CPU_FTR_CTRL, 0, 0,            0, 3, 0},
158         {CPU_FTR_NOEXECUTE, 0, 0,       0, 6, 0},
159         {CPU_FTR_NODSISRALIGN, 0, 0,    1, 1, 1},
160         {0, MMU_FTR_CI_LARGE_PAGE, 0,   1, 2, 0},
161         {CPU_FTR_REAL_LE, PPC_FEATURE_TRUE_LE, 5, 0, 0},
162         /*
163          * If the kernel doesn't support TM (ie. CONFIG_PPC_TRANSACTIONAL_MEM=n),
164          * we don't want to turn on CPU_FTR_TM here, so we use CPU_FTR_TM_COMP
165          * which is 0 if the kernel doesn't support TM.
166          */
167         {CPU_FTR_TM_COMP, 0, 0,         22, 0, 0},
168 };
169 
170 static void __init scan_features(unsigned long node, const unsigned char *ftrs,
171                                  unsigned long tablelen,
172                                  struct ibm_pa_feature *fp,
173                                  unsigned long ft_size)
174 {
175         unsigned long i, len, bit;
176 
177         /* find descriptor with type == 0 */
178         for (;;) {
179                 if (tablelen < 3)
180                         return;
181                 len = 2 + ftrs[0];
182                 if (tablelen < len)
183                         return;         /* descriptor 0 not found */
184                 if (ftrs[1] == 0)
185                         break;
186                 tablelen -= len;
187                 ftrs += len;
188         }
189 
190         /* loop over bits we know about */
191         for (i = 0; i < ft_size; ++i, ++fp) {
192                 if (fp->pabyte >= ftrs[0])
193                         continue;
194                 bit = (ftrs[2 + fp->pabyte] >> (7 - fp->pabit)) & 1;
195                 if (bit ^ fp->invert) {
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                 } else {
200                         cur_cpu_spec->cpu_features &= ~fp->cpu_features;
201                         cur_cpu_spec->cpu_user_features &= ~fp->cpu_user_ftrs;
202                         cur_cpu_spec->mmu_features &= ~fp->mmu_features;
203                 }
204         }
205 }
206 
207 static void __init check_cpu_pa_features(unsigned long node)
208 {
209         const unsigned char *pa_ftrs;
210         int tablelen;
211 
212         pa_ftrs = of_get_flat_dt_prop(node, "ibm,pa-features", &tablelen);
213         if (pa_ftrs == NULL)
214                 return;
215 
216         scan_features(node, pa_ftrs, tablelen,
217                       ibm_pa_features, ARRAY_SIZE(ibm_pa_features));
218 }
219 
220 #ifdef CONFIG_PPC_STD_MMU_64
221 static void __init init_mmu_slb_size(unsigned long node)
222 {
223         const __be32 *slb_size_ptr;
224 
225         slb_size_ptr = of_get_flat_dt_prop(node, "slb-size", NULL) ? :
226                         of_get_flat_dt_prop(node, "ibm,slb-size", NULL);
227 
228         if (slb_size_ptr)
229                 mmu_slb_size = be32_to_cpup(slb_size_ptr);
230 }
231 #else
232 #define init_mmu_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                 intserv = of_get_flat_dt_prop(node, "reg", &len);
314 
315         nthreads = len / sizeof(int);
316 
317         /*
318          * Now see if any of these threads match our boot cpu.
319          * NOTE: This must match the parsing done in smp_setup_cpu_maps.
320          */
321         for (i = 0; i < nthreads; i++) {
322                 /*
323                  * version 2 of the kexec param format adds the phys cpuid of
324                  * booted proc.
325                  */
326                 if (fdt_version(initial_boot_params) >= 2) {
327                         if (be32_to_cpu(intserv[i]) ==
328                             fdt_boot_cpuid_phys(initial_boot_params)) {
329                                 found = boot_cpu_count;
330                                 found_thread = i;
331                         }
332                 } else {
333                         /*
334                          * Check if it's the boot-cpu, set it's hw index now,
335                          * unfortunately this format did not support booting
336                          * off secondary threads.
337                          */
338                         if (of_get_flat_dt_prop(node,
339                                         "linux,boot-cpu", NULL) != NULL)
340                                 found = boot_cpu_count;
341                 }
342 #ifdef CONFIG_SMP
343                 /* logical cpu id is always 0 on UP kernels */
344                 boot_cpu_count++;
345 #endif
346         }
347 
348         /* Not the boot CPU */
349         if (found < 0)
350                 return 0;
351 
352         DBG("boot cpu: logical %d physical %d\n", found,
353             be32_to_cpu(intserv[found_thread]));
354         boot_cpuid = found;
355         set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
356 
357         /*
358          * PAPR defines "logical" PVR values for cpus that
359          * meet various levels of the architecture:
360          * 0x0f000001   Architecture version 2.04
361          * 0x0f000002   Architecture version 2.05
362          * If the cpu-version property in the cpu node contains
363          * such a value, we call identify_cpu again with the
364          * logical PVR value in order to use the cpu feature
365          * bits appropriate for the architecture level.
366          *
367          * A POWER6 partition in "POWER6 architected" mode
368          * uses the 0x0f000002 PVR value; in POWER5+ mode
369          * it uses 0x0f000001.
370          */
371         prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
372         if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
373                 identify_cpu(0, be32_to_cpup(prop));
374 
375         identical_pvr_fixup(node);
376 
377         check_cpu_feature_properties(node);
378         check_cpu_pa_features(node);
379         init_mmu_slb_size(node);
380 
381 #ifdef CONFIG_PPC64
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         return 0;
388 }
389 
390 static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
391                                                 const char *uname,
392                                                 int depth, void *data)
393 {
394         const 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         const __be32 *dm, *ls, *usm;
446         int l;
447         unsigned long n, flags;
448         u64 base, size, memblock_size;
449         unsigned int is_kexec_kdump = 0, rngs;
450 
451         ls = of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
452         if (ls == NULL || l < dt_root_size_cells * sizeof(__be32))
453                 return 0;
454         memblock_size = dt_mem_next_cell(dt_root_size_cells, &ls);
455 
456         dm = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
457         if (dm == NULL || l < sizeof(__be32))
458                 return 0;
459 
460         n = of_read_number(dm++, 1);    /* number of entries */
461         if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(__be32))
462                 return 0;
463 
464         /* check if this is a kexec/kdump kernel. */
465         usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory",
466                                                  &l);
467         if (usm != NULL)
468                 is_kexec_kdump = 1;
469 
470         for (; n != 0; --n) {
471                 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
472                 flags = of_read_number(&dm[3], 1);
473                 /* skip DRC index, pad, assoc. list index, flags */
474                 dm += 4;
475                 /* skip this block if the reserved bit is set in flags
476                    or if the block is not assigned to this partition */
477                 if ((flags & DRCONF_MEM_RESERVED) ||
478                                 !(flags & DRCONF_MEM_ASSIGNED))
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_reserve_self();
573         early_init_fdt_scan_reserved_mem();
574 
575         dt_root = of_get_flat_dt_root();
576 
577         prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);
578 
579         if (!prop)
580                 return;
581 
582         DBG("Found new-style reserved-ranges\n");
583 
584         /* Each reserved range is an (address,size) pair, 2 cells each,
585          * totalling 4 cells per range. */
586         for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
587                 u64 base, size;
588 
589                 base = of_read_number(prop + (i * 4) + 0, 2);
590                 size = of_read_number(prop + (i * 4) + 2, 2);
591 
592                 if (size) {
593                         DBG("reserving: %llx -> %llx\n", base, size);
594                         memblock_reserve(base, size);
595                 }
596         }
597 }
598 
599 static void __init early_reserve_mem(void)
600 {
601         __be64 *reserve_map;
602 
603         reserve_map = (__be64 *)(((unsigned long)initial_boot_params) +
604                         fdt_off_mem_rsvmap(initial_boot_params));
605 
606         /* Look for the new "reserved-regions" property in the DT */
607         early_reserve_mem_dt();
608 
609 #ifdef CONFIG_BLK_DEV_INITRD
610         /* Then reserve the initrd, if any */
611         if (initrd_start && (initrd_end > initrd_start)) {
612                 memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),
613                         _ALIGN_UP(initrd_end, PAGE_SIZE) -
614                         _ALIGN_DOWN(initrd_start, PAGE_SIZE));
615         }
616 #endif /* CONFIG_BLK_DEV_INITRD */
617 
618 #ifdef CONFIG_PPC32
619         /* 
620          * Handle the case where we might be booting from an old kexec
621          * image that setup the mem_rsvmap as pairs of 32-bit values
622          */
623         if (be64_to_cpup(reserve_map) > 0xffffffffull) {
624                 u32 base_32, size_32;
625                 __be32 *reserve_map_32 = (__be32 *)reserve_map;
626 
627                 DBG("Found old 32-bit reserve map\n");
628 
629                 while (1) {
630                         base_32 = be32_to_cpup(reserve_map_32++);
631                         size_32 = be32_to_cpup(reserve_map_32++);
632                         if (size_32 == 0)
633                                 break;
634                         DBG("reserving: %x -> %x\n", base_32, size_32);
635                         memblock_reserve(base_32, size_32);
636                 }
637                 return;
638         }
639 #endif
640 }
641 
642 void __init early_init_devtree(void *params)
643 {
644         phys_addr_t limit;
645 
646         DBG(" -> early_init_devtree(%p)\n", params);
647 
648         /* Too early to BUG_ON(), do it by hand */
649         if (!early_init_dt_verify(params))
650                 panic("BUG: Failed verifying flat device tree, bad version?");
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         /* Retrieve various informations from the /chosen node of the
668          * device-tree, including the platform type, initrd location and
669          * size, TCE reserve, and more ...
670          */
671         of_scan_flat_dt(early_init_dt_scan_chosen_ppc, boot_command_line);
672 
673         /* Scan memory nodes and rebuild MEMBLOCKs */
674         of_scan_flat_dt(early_init_dt_scan_root, NULL);
675         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
676 
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         /* Ensure that total memory size is page-aligned. */
700         limit = ALIGN(memory_limit ?: memblock_phys_mem_size(), PAGE_SIZE);
701         memblock_enforce_memory_limit(limit);
702 
703         memblock_allow_resize();
704         memblock_dump_all();
705 
706         DBG("Phys. mem: %llx\n", memblock_phys_mem_size());
707 
708         /* We may need to relocate the flat tree, do it now.
709          * FIXME .. and the initrd too? */
710         move_device_tree();
711 
712         allocate_pacas();
713 
714         DBG("Scanning CPUs ...\n");
715 
716         /* Retrieve CPU related informations from the flat tree
717          * (altivec support, boot CPU ID, ...)
718          */
719         of_scan_flat_dt(early_init_dt_scan_cpus, NULL);
720         if (boot_cpuid < 0) {
721                 printk("Failed to identify boot CPU !\n");
722                 BUG();
723         }
724 
725 #if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
726         /* We'll later wait for secondaries to check in; there are
727          * NCPUS-1 non-boot CPUs  :-)
728          */
729         spinning_secondaries = boot_cpu_count - 1;
730 #endif
731 
732 #ifdef CONFIG_PPC_POWERNV
733         /* Scan and build the list of machine check recoverable ranges */
734         of_scan_flat_dt(early_init_dt_scan_recoverable_ranges, NULL);
735 #endif
736 
737         DBG(" <- early_init_devtree()\n");
738 }
739 
740 #ifdef CONFIG_RELOCATABLE
741 /*
742  * This function run before early_init_devtree, so we have to init
743  * initial_boot_params.
744  */
745 void __init early_get_first_memblock_info(void *params, phys_addr_t *size)
746 {
747         /* Setup flat device-tree pointer */
748         initial_boot_params = params;
749 
750         /*
751          * Scan the memory nodes and set add_mem_to_memblock to 0 to avoid
752          * mess the memblock.
753          */
754         add_mem_to_memblock = 0;
755         of_scan_flat_dt(early_init_dt_scan_root, NULL);
756         of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
757         add_mem_to_memblock = 1;
758 
759         if (size)
760                 *size = first_memblock_size;
761 }
762 #endif
763 
764 /*******
765  *
766  * New implementation of the OF "find" APIs, return a refcounted
767  * object, call of_node_put() when done.  The device tree and list
768  * are protected by a rw_lock.
769  *
770  * Note that property management will need some locking as well,
771  * this isn't dealt with yet.
772  *
773  *******/
774 
775 /**
776  * of_get_ibm_chip_id - Returns the IBM "chip-id" of a device
777  * @np: device node of the device
778  *
779  * This looks for a property "ibm,chip-id" in the node or any
780  * of its parents and returns its content, or -1 if it cannot
781  * be found.
782  */
783 int of_get_ibm_chip_id(struct device_node *np)
784 {
785         of_node_get(np);
786         while(np) {
787                 struct device_node *old = np;
788                 const __be32 *prop;
789 
790                 prop = of_get_property(np, "ibm,chip-id", NULL);
791                 if (prop) {
792                         of_node_put(np);
793                         return be32_to_cpup(prop);
794                 }
795                 np = of_get_parent(np);
796                 of_node_put(old);
797         }
798         return -1;
799 }
800 EXPORT_SYMBOL(of_get_ibm_chip_id);
801 
802 /**
803  * cpu_to_chip_id - Return the cpus chip-id
804  * @cpu: The logical cpu number.
805  *
806  * Return the value of the ibm,chip-id property corresponding to the given
807  * logical cpu number. If the chip-id can not be found, returns -1.
808  */
809 int cpu_to_chip_id(int cpu)
810 {
811         struct device_node *np;
812 
813         np = of_get_cpu_node(cpu, NULL);
814         if (!np)
815                 return -1;
816 
817         of_node_put(np);
818         return of_get_ibm_chip_id(np);
819 }
820 EXPORT_SYMBOL(cpu_to_chip_id);
821 
822 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
823 {
824         return (int)phys_id == get_hard_smp_processor_id(cpu);
825 }
826 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp