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TOMOYO Linux Cross Reference
Linux/arch/mips/kernel/setup.c

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ 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  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 1995 Linus Torvalds
  7  * Copyright (C) 1995 Waldorf Electronics
  8  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
  9  * Copyright (C) 1996 Stoned Elipot
 10  * Copyright (C) 1999 Silicon Graphics, Inc.
 11  * Copyright (C) 2000, 2001, 2002, 2007  Maciej W. Rozycki
 12  */
 13 #include <linux/init.h>
 14 #include <linux/ioport.h>
 15 #include <linux/export.h>
 16 #include <linux/screen_info.h>
 17 #include <linux/memblock.h>
 18 #include <linux/bootmem.h>
 19 #include <linux/initrd.h>
 20 #include <linux/root_dev.h>
 21 #include <linux/highmem.h>
 22 #include <linux/console.h>
 23 #include <linux/pfn.h>
 24 #include <linux/debugfs.h>
 25 #include <linux/kexec.h>
 26 #include <linux/sizes.h>
 27 #include <linux/device.h>
 28 #include <linux/dma-contiguous.h>
 29 #include <linux/decompress/generic.h>
 30 
 31 #include <asm/addrspace.h>
 32 #include <asm/bootinfo.h>
 33 #include <asm/bugs.h>
 34 #include <asm/cache.h>
 35 #include <asm/cdmm.h>
 36 #include <asm/cpu.h>
 37 #include <asm/debug.h>
 38 #include <asm/sections.h>
 39 #include <asm/setup.h>
 40 #include <asm/smp-ops.h>
 41 #include <asm/prom.h>
 42 
 43 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
 44 const char __section(.appended_dtb) __appended_dtb[0x100000];
 45 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
 46 
 47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 48 
 49 EXPORT_SYMBOL(cpu_data);
 50 
 51 #ifdef CONFIG_VT
 52 struct screen_info screen_info;
 53 #endif
 54 
 55 /*
 56  * Setup information
 57  *
 58  * These are initialized so they are in the .data section
 59  */
 60 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
 61 
 62 EXPORT_SYMBOL(mips_machtype);
 63 
 64 struct boot_mem_map boot_mem_map;
 65 
 66 static char __initdata command_line[COMMAND_LINE_SIZE];
 67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
 68 
 69 #ifdef CONFIG_CMDLINE_BOOL
 70 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
 71 #endif
 72 
 73 /*
 74  * mips_io_port_base is the begin of the address space to which x86 style
 75  * I/O ports are mapped.
 76  */
 77 const unsigned long mips_io_port_base = -1;
 78 EXPORT_SYMBOL(mips_io_port_base);
 79 
 80 static struct resource code_resource = { .name = "Kernel code", };
 81 static struct resource data_resource = { .name = "Kernel data", };
 82 
 83 static void *detect_magic __initdata = detect_memory_region;
 84 
 85 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
 86 {
 87         int x = boot_mem_map.nr_map;
 88         int i;
 89 
 90         /*
 91          * If the region reaches the top of the physical address space, adjust
 92          * the size slightly so that (start + size) doesn't overflow
 93          */
 94         if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
 95                 --size;
 96 
 97         /* Sanity check */
 98         if (start + size < start) {
 99                 pr_warn("Trying to add an invalid memory region, skipped\n");
100                 return;
101         }
102 
103         /*
104          * Try to merge with existing entry, if any.
105          */
106         for (i = 0; i < boot_mem_map.nr_map; i++) {
107                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
108                 unsigned long top;
109 
110                 if (entry->type != type)
111                         continue;
112 
113                 if (start + size < entry->addr)
114                         continue;                       /* no overlap */
115 
116                 if (entry->addr + entry->size < start)
117                         continue;                       /* no overlap */
118 
119                 top = max(entry->addr + entry->size, start + size);
120                 entry->addr = min(entry->addr, start);
121                 entry->size = top - entry->addr;
122 
123                 return;
124         }
125 
126         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
127                 pr_err("Ooops! Too many entries in the memory map!\n");
128                 return;
129         }
130 
131         boot_mem_map.map[x].addr = start;
132         boot_mem_map.map[x].size = size;
133         boot_mem_map.map[x].type = type;
134         boot_mem_map.nr_map++;
135 }
136 
137 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
138 {
139         void *dm = &detect_magic;
140         phys_addr_t size;
141 
142         for (size = sz_min; size < sz_max; size <<= 1) {
143                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
144                         break;
145         }
146 
147         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
148                 ((unsigned long long) size) / SZ_1M,
149                 (unsigned long long) start,
150                 ((unsigned long long) sz_min) / SZ_1M,
151                 ((unsigned long long) sz_max) / SZ_1M);
152 
153         add_memory_region(start, size, BOOT_MEM_RAM);
154 }
155 
156 static void __init print_memory_map(void)
157 {
158         int i;
159         const int field = 2 * sizeof(unsigned long);
160 
161         for (i = 0; i < boot_mem_map.nr_map; i++) {
162                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
163                        field, (unsigned long long) boot_mem_map.map[i].size,
164                        field, (unsigned long long) boot_mem_map.map[i].addr);
165 
166                 switch (boot_mem_map.map[i].type) {
167                 case BOOT_MEM_RAM:
168                         printk(KERN_CONT "(usable)\n");
169                         break;
170                 case BOOT_MEM_INIT_RAM:
171                         printk(KERN_CONT "(usable after init)\n");
172                         break;
173                 case BOOT_MEM_ROM_DATA:
174                         printk(KERN_CONT "(ROM data)\n");
175                         break;
176                 case BOOT_MEM_RESERVED:
177                         printk(KERN_CONT "(reserved)\n");
178                         break;
179                 default:
180                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
181                         break;
182                 }
183         }
184 }
185 
186 /*
187  * Manage initrd
188  */
189 #ifdef CONFIG_BLK_DEV_INITRD
190 
191 static int __init rd_start_early(char *p)
192 {
193         unsigned long start = memparse(p, &p);
194 
195 #ifdef CONFIG_64BIT
196         /* Guess if the sign extension was forgotten by bootloader */
197         if (start < XKPHYS)
198                 start = (int)start;
199 #endif
200         initrd_start = start;
201         initrd_end += start;
202         return 0;
203 }
204 early_param("rd_start", rd_start_early);
205 
206 static int __init rd_size_early(char *p)
207 {
208         initrd_end += memparse(p, &p);
209         return 0;
210 }
211 early_param("rd_size", rd_size_early);
212 
213 /* it returns the next free pfn after initrd */
214 static unsigned long __init init_initrd(void)
215 {
216         unsigned long end;
217 
218         /*
219          * Board specific code or command line parser should have
220          * already set up initrd_start and initrd_end. In these cases
221          * perfom sanity checks and use them if all looks good.
222          */
223         if (!initrd_start || initrd_end <= initrd_start)
224                 goto disable;
225 
226         if (initrd_start & ~PAGE_MASK) {
227                 pr_err("initrd start must be page aligned\n");
228                 goto disable;
229         }
230         if (initrd_start < PAGE_OFFSET) {
231                 pr_err("initrd start < PAGE_OFFSET\n");
232                 goto disable;
233         }
234 
235         /*
236          * Sanitize initrd addresses. For example firmware
237          * can't guess if they need to pass them through
238          * 64-bits values if the kernel has been built in pure
239          * 32-bit. We need also to switch from KSEG0 to XKPHYS
240          * addresses now, so the code can now safely use __pa().
241          */
242         end = __pa(initrd_end);
243         initrd_end = (unsigned long)__va(end);
244         initrd_start = (unsigned long)__va(__pa(initrd_start));
245 
246         ROOT_DEV = Root_RAM0;
247         return PFN_UP(end);
248 disable:
249         initrd_start = 0;
250         initrd_end = 0;
251         return 0;
252 }
253 
254 /* In some conditions (e.g. big endian bootloader with a little endian
255    kernel), the initrd might appear byte swapped.  Try to detect this and
256    byte swap it if needed.  */
257 static void __init maybe_bswap_initrd(void)
258 {
259 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
260         u64 buf;
261 
262         /* Check for CPIO signature */
263         if (!memcmp((void *)initrd_start, "070701", 6))
264                 return;
265 
266         /* Check for compressed initrd */
267         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
268                 return;
269 
270         /* Try again with a byte swapped header */
271         buf = swab64p((u64 *)initrd_start);
272         if (!memcmp(&buf, "070701", 6) ||
273             decompress_method((unsigned char *)(&buf), 8, NULL)) {
274                 unsigned long i;
275 
276                 pr_info("Byteswapped initrd detected\n");
277                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
278                         swab64s((u64 *)i);
279         }
280 #endif
281 }
282 
283 static void __init finalize_initrd(void)
284 {
285         unsigned long size = initrd_end - initrd_start;
286 
287         if (size == 0) {
288                 printk(KERN_INFO "Initrd not found or empty");
289                 goto disable;
290         }
291         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
292                 printk(KERN_ERR "Initrd extends beyond end of memory");
293                 goto disable;
294         }
295 
296         maybe_bswap_initrd();
297 
298         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
299         initrd_below_start_ok = 1;
300 
301         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
302                 initrd_start, size);
303         return;
304 disable:
305         printk(KERN_CONT " - disabling initrd\n");
306         initrd_start = 0;
307         initrd_end = 0;
308 }
309 
310 #else  /* !CONFIG_BLK_DEV_INITRD */
311 
312 static unsigned long __init init_initrd(void)
313 {
314         return 0;
315 }
316 
317 #define finalize_initrd()       do {} while (0)
318 
319 #endif
320 
321 /*
322  * Initialize the bootmem allocator. It also setup initrd related data
323  * if needed.
324  */
325 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
326 
327 static void __init bootmem_init(void)
328 {
329         init_initrd();
330         finalize_initrd();
331 }
332 
333 #else  /* !CONFIG_SGI_IP27 */
334 
335 static void __init bootmem_init(void)
336 {
337         unsigned long reserved_end;
338         unsigned long mapstart = ~0UL;
339         unsigned long bootmap_size;
340         int i;
341 
342         /*
343          * Sanity check any INITRD first. We don't take it into account
344          * for bootmem setup initially, rely on the end-of-kernel-code
345          * as our memory range starting point. Once bootmem is inited we
346          * will reserve the area used for the initrd.
347          */
348         init_initrd();
349         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
350 
351         /*
352          * max_low_pfn is not a number of pages. The number of pages
353          * of the system is given by 'max_low_pfn - min_low_pfn'.
354          */
355         min_low_pfn = ~0UL;
356         max_low_pfn = 0;
357 
358         /*
359          * Find the highest page frame number we have available.
360          */
361         for (i = 0; i < boot_mem_map.nr_map; i++) {
362                 unsigned long start, end;
363 
364                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
365                         continue;
366 
367                 start = PFN_UP(boot_mem_map.map[i].addr);
368                 end = PFN_DOWN(boot_mem_map.map[i].addr
369                                 + boot_mem_map.map[i].size);
370 
371                 if (end > max_low_pfn)
372                         max_low_pfn = end;
373                 if (start < min_low_pfn)
374                         min_low_pfn = start;
375                 if (end <= reserved_end)
376                         continue;
377 #ifdef CONFIG_BLK_DEV_INITRD
378                 /* Skip zones before initrd and initrd itself */
379                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
380                         continue;
381 #endif
382                 if (start >= mapstart)
383                         continue;
384                 mapstart = max(reserved_end, start);
385         }
386 
387         if (min_low_pfn >= max_low_pfn)
388                 panic("Incorrect memory mapping !!!");
389         if (min_low_pfn > ARCH_PFN_OFFSET) {
390                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
391                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
392                         min_low_pfn - ARCH_PFN_OFFSET);
393         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
394                 pr_info("%lu free pages won't be used\n",
395                         ARCH_PFN_OFFSET - min_low_pfn);
396         }
397         min_low_pfn = ARCH_PFN_OFFSET;
398 
399         /*
400          * Determine low and high memory ranges
401          */
402         max_pfn = max_low_pfn;
403         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
404 #ifdef CONFIG_HIGHMEM
405                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
406                 highend_pfn = max_low_pfn;
407 #endif
408                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
409         }
410 
411 #ifdef CONFIG_BLK_DEV_INITRD
412         /*
413          * mapstart should be after initrd_end
414          */
415         if (initrd_end)
416                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
417 #endif
418 
419         /*
420          * Initialize the boot-time allocator with low memory only.
421          */
422         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
423                                          min_low_pfn, max_low_pfn);
424 
425 
426         for (i = 0; i < boot_mem_map.nr_map; i++) {
427                 unsigned long start, end;
428 
429                 start = PFN_UP(boot_mem_map.map[i].addr);
430                 end = PFN_DOWN(boot_mem_map.map[i].addr
431                                 + boot_mem_map.map[i].size);
432 
433                 if (start <= min_low_pfn)
434                         start = min_low_pfn;
435                 if (start >= end)
436                         continue;
437 
438 #ifndef CONFIG_HIGHMEM
439                 if (end > max_low_pfn)
440                         end = max_low_pfn;
441 
442                 /*
443                  * ... finally, is the area going away?
444                  */
445                 if (end <= start)
446                         continue;
447 #endif
448 
449                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
450         }
451 
452         /*
453          * Register fully available low RAM pages with the bootmem allocator.
454          */
455         for (i = 0; i < boot_mem_map.nr_map; i++) {
456                 unsigned long start, end, size;
457 
458                 start = PFN_UP(boot_mem_map.map[i].addr);
459                 end   = PFN_DOWN(boot_mem_map.map[i].addr
460                                     + boot_mem_map.map[i].size);
461 
462                 /*
463                  * Reserve usable memory.
464                  */
465                 switch (boot_mem_map.map[i].type) {
466                 case BOOT_MEM_RAM:
467                         break;
468                 case BOOT_MEM_INIT_RAM:
469                         memory_present(0, start, end);
470                         continue;
471                 default:
472                         /* Not usable memory */
473                         continue;
474                 }
475 
476                 /*
477                  * We are rounding up the start address of usable memory
478                  * and at the end of the usable range downwards.
479                  */
480                 if (start >= max_low_pfn)
481                         continue;
482                 if (start < reserved_end)
483                         start = reserved_end;
484                 if (end > max_low_pfn)
485                         end = max_low_pfn;
486 
487                 /*
488                  * ... finally, is the area going away?
489                  */
490                 if (end <= start)
491                         continue;
492                 size = end - start;
493 
494                 /* Register lowmem ranges */
495                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
496                 memory_present(0, start, end);
497         }
498 
499         /*
500          * Reserve the bootmap memory.
501          */
502         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
503 
504 #ifdef CONFIG_RELOCATABLE
505         /*
506          * The kernel reserves all memory below its _end symbol as bootmem,
507          * but the kernel may now be at a much higher address. The memory
508          * between the original and new locations may be returned to the system.
509          */
510         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
511                 unsigned long offset;
512                 extern void show_kernel_relocation(const char *level);
513 
514                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
515                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
516 
517 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
518                 /*
519                  * This information is necessary when debugging the kernel
520                  * But is a security vulnerability otherwise!
521                  */
522                 show_kernel_relocation(KERN_INFO);
523 #endif
524         }
525 #endif
526 
527         /*
528          * Reserve initrd memory if needed.
529          */
530         finalize_initrd();
531 }
532 
533 #endif  /* CONFIG_SGI_IP27 */
534 
535 /*
536  * arch_mem_init - initialize memory management subsystem
537  *
538  *  o plat_mem_setup() detects the memory configuration and will record detected
539  *    memory areas using add_memory_region.
540  *
541  * At this stage the memory configuration of the system is known to the
542  * kernel but generic memory management system is still entirely uninitialized.
543  *
544  *  o bootmem_init()
545  *  o sparse_init()
546  *  o paging_init()
547  *  o dma_contiguous_reserve()
548  *
549  * At this stage the bootmem allocator is ready to use.
550  *
551  * NOTE: historically plat_mem_setup did the entire platform initialization.
552  *       This was rather impractical because it meant plat_mem_setup had to
553  * get away without any kind of memory allocator.  To keep old code from
554  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
555  * initialization hook for anything else was introduced.
556  */
557 
558 static int usermem __initdata;
559 
560 static int __init early_parse_mem(char *p)
561 {
562         phys_addr_t start, size;
563 
564         /*
565          * If a user specifies memory size, we
566          * blow away any automatically generated
567          * size.
568          */
569         if (usermem == 0) {
570                 boot_mem_map.nr_map = 0;
571                 usermem = 1;
572         }
573         start = 0;
574         size = memparse(p, &p);
575         if (*p == '@')
576                 start = memparse(p + 1, &p);
577 
578         add_memory_region(start, size, BOOT_MEM_RAM);
579         return 0;
580 }
581 early_param("mem", early_parse_mem);
582 
583 #ifdef CONFIG_PROC_VMCORE
584 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
585 static int __init early_parse_elfcorehdr(char *p)
586 {
587         int i;
588 
589         setup_elfcorehdr = memparse(p, &p);
590 
591         for (i = 0; i < boot_mem_map.nr_map; i++) {
592                 unsigned long start = boot_mem_map.map[i].addr;
593                 unsigned long end = (boot_mem_map.map[i].addr +
594                                      boot_mem_map.map[i].size);
595                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
596                         /*
597                          * Reserve from the elf core header to the end of
598                          * the memory segment, that should all be kdump
599                          * reserved memory.
600                          */
601                         setup_elfcorehdr_size = end - setup_elfcorehdr;
602                         break;
603                 }
604         }
605         /*
606          * If we don't find it in the memory map, then we shouldn't
607          * have to worry about it, as the new kernel won't use it.
608          */
609         return 0;
610 }
611 early_param("elfcorehdr", early_parse_elfcorehdr);
612 #endif
613 
614 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
615 {
616         phys_addr_t size;
617         int i;
618 
619         size = end - mem;
620         if (!size)
621                 return;
622 
623         /* Make sure it is in the boot_mem_map */
624         for (i = 0; i < boot_mem_map.nr_map; i++) {
625                 if (mem >= boot_mem_map.map[i].addr &&
626                     mem < (boot_mem_map.map[i].addr +
627                            boot_mem_map.map[i].size))
628                         return;
629         }
630         add_memory_region(mem, size, type);
631 }
632 
633 #ifdef CONFIG_KEXEC
634 static inline unsigned long long get_total_mem(void)
635 {
636         unsigned long long total;
637 
638         total = max_pfn - min_low_pfn;
639         return total << PAGE_SHIFT;
640 }
641 
642 static void __init mips_parse_crashkernel(void)
643 {
644         unsigned long long total_mem;
645         unsigned long long crash_size, crash_base;
646         int ret;
647 
648         total_mem = get_total_mem();
649         ret = parse_crashkernel(boot_command_line, total_mem,
650                                 &crash_size, &crash_base);
651         if (ret != 0 || crash_size <= 0)
652                 return;
653 
654         crashk_res.start = crash_base;
655         crashk_res.end   = crash_base + crash_size - 1;
656 }
657 
658 static void __init request_crashkernel(struct resource *res)
659 {
660         int ret;
661 
662         ret = request_resource(res, &crashk_res);
663         if (!ret)
664                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
665                         (unsigned long)((crashk_res.end -
666                                          crashk_res.start + 1) >> 20),
667                         (unsigned long)(crashk_res.start  >> 20));
668 }
669 #else /* !defined(CONFIG_KEXEC)         */
670 static void __init mips_parse_crashkernel(void)
671 {
672 }
673 
674 static void __init request_crashkernel(struct resource *res)
675 {
676 }
677 #endif /* !defined(CONFIG_KEXEC)  */
678 
679 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
680 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
681 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
682 #define BUILTIN_EXTEND_WITH_PROM        \
683         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
684 
685 static void __init arch_mem_init(char **cmdline_p)
686 {
687         struct memblock_region *reg;
688         extern void plat_mem_setup(void);
689 
690         /* call board setup routine */
691         plat_mem_setup();
692 
693         /*
694          * Make sure all kernel memory is in the maps.  The "UP" and
695          * "DOWN" are opposite for initdata since if it crosses over
696          * into another memory section you don't want that to be
697          * freed when the initdata is freed.
698          */
699         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
700                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
701                          BOOT_MEM_RAM);
702         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
703                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
704                          BOOT_MEM_INIT_RAM);
705 
706         pr_info("Determined physical RAM map:\n");
707         print_memory_map();
708 
709 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
710         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
711 #else
712         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
713             (USE_DTB_CMDLINE && !boot_command_line[0]))
714                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
715 
716         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
717                 if (boot_command_line[0])
718                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
719                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
720         }
721 
722 #if defined(CONFIG_CMDLINE_BOOL)
723         if (builtin_cmdline[0]) {
724                 if (boot_command_line[0])
725                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
726                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
727         }
728 
729         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
730                 if (boot_command_line[0])
731                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
732                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
733         }
734 #endif
735 #endif
736         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
737 
738         *cmdline_p = command_line;
739 
740         parse_early_param();
741 
742         if (usermem) {
743                 pr_info("User-defined physical RAM map:\n");
744                 print_memory_map();
745         }
746 
747         bootmem_init();
748 #ifdef CONFIG_PROC_VMCORE
749         if (setup_elfcorehdr && setup_elfcorehdr_size) {
750                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
751                        setup_elfcorehdr, setup_elfcorehdr_size);
752                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
753                                 BOOTMEM_DEFAULT);
754         }
755 #endif
756 
757         mips_parse_crashkernel();
758 #ifdef CONFIG_KEXEC
759         if (crashk_res.start != crashk_res.end)
760                 reserve_bootmem(crashk_res.start,
761                                 crashk_res.end - crashk_res.start + 1,
762                                 BOOTMEM_DEFAULT);
763 #endif
764         device_tree_init();
765         sparse_init();
766         plat_swiotlb_setup();
767 
768         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
769         /* Tell bootmem about cma reserved memblock section */
770         for_each_memblock(reserved, reg)
771                 if (reg->size != 0)
772                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
773 
774         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
775                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
776 }
777 
778 static void __init resource_init(void)
779 {
780         int i;
781 
782         if (UNCAC_BASE != IO_BASE)
783                 return;
784 
785         code_resource.start = __pa_symbol(&_text);
786         code_resource.end = __pa_symbol(&_etext) - 1;
787         data_resource.start = __pa_symbol(&_etext);
788         data_resource.end = __pa_symbol(&_edata) - 1;
789 
790         for (i = 0; i < boot_mem_map.nr_map; i++) {
791                 struct resource *res;
792                 unsigned long start, end;
793 
794                 start = boot_mem_map.map[i].addr;
795                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
796                 if (start >= HIGHMEM_START)
797                         continue;
798                 if (end >= HIGHMEM_START)
799                         end = HIGHMEM_START - 1;
800 
801                 res = alloc_bootmem(sizeof(struct resource));
802 
803                 res->start = start;
804                 res->end = end;
805                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
806 
807                 switch (boot_mem_map.map[i].type) {
808                 case BOOT_MEM_RAM:
809                 case BOOT_MEM_INIT_RAM:
810                 case BOOT_MEM_ROM_DATA:
811                         res->name = "System RAM";
812                         res->flags |= IORESOURCE_SYSRAM;
813                         break;
814                 case BOOT_MEM_RESERVED:
815                 default:
816                         res->name = "reserved";
817                 }
818 
819                 request_resource(&iomem_resource, res);
820 
821                 /*
822                  *  We don't know which RAM region contains kernel data,
823                  *  so we try it repeatedly and let the resource manager
824                  *  test it.
825                  */
826                 request_resource(res, &code_resource);
827                 request_resource(res, &data_resource);
828                 request_crashkernel(res);
829         }
830 }
831 
832 #ifdef CONFIG_SMP
833 static void __init prefill_possible_map(void)
834 {
835         int i, possible = num_possible_cpus();
836 
837         if (possible > nr_cpu_ids)
838                 possible = nr_cpu_ids;
839 
840         for (i = 0; i < possible; i++)
841                 set_cpu_possible(i, true);
842         for (; i < NR_CPUS; i++)
843                 set_cpu_possible(i, false);
844 
845         nr_cpu_ids = possible;
846 }
847 #else
848 static inline void prefill_possible_map(void) {}
849 #endif
850 
851 void __init setup_arch(char **cmdline_p)
852 {
853         cpu_probe();
854         mips_cm_probe();
855         prom_init();
856 
857         setup_early_fdc_console();
858 #ifdef CONFIG_EARLY_PRINTK
859         setup_early_printk();
860 #endif
861         cpu_report();
862         check_bugs_early();
863 
864 #if defined(CONFIG_VT)
865 #if defined(CONFIG_VGA_CONSOLE)
866         conswitchp = &vga_con;
867 #elif defined(CONFIG_DUMMY_CONSOLE)
868         conswitchp = &dummy_con;
869 #endif
870 #endif
871 
872         arch_mem_init(cmdline_p);
873 
874         resource_init();
875         plat_smp_setup();
876         prefill_possible_map();
877 
878         cpu_cache_init();
879         paging_init();
880 }
881 
882 unsigned long kernelsp[NR_CPUS];
883 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
884 
885 #ifdef CONFIG_USE_OF
886 unsigned long fw_passed_dtb;
887 #endif
888 
889 #ifdef CONFIG_DEBUG_FS
890 struct dentry *mips_debugfs_dir;
891 static int __init debugfs_mips(void)
892 {
893         struct dentry *d;
894 
895         d = debugfs_create_dir("mips", NULL);
896         if (!d)
897                 return -ENOMEM;
898         mips_debugfs_dir = d;
899         return 0;
900 }
901 arch_initcall(debugfs_mips);
902 #endif
903 

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