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Linux/arch/mips/kernel/setup.c

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  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/initrd.h>
 19 #include <linux/root_dev.h>
 20 #include <linux/highmem.h>
 21 #include <linux/console.h>
 22 #include <linux/pfn.h>
 23 #include <linux/debugfs.h>
 24 #include <linux/kexec.h>
 25 #include <linux/sizes.h>
 26 #include <linux/device.h>
 27 #include <linux/dma-contiguous.h>
 28 #include <linux/decompress/generic.h>
 29 #include <linux/of_fdt.h>
 30 #include <linux/of_reserved_mem.h>
 31 #include <linux/dmi.h>
 32 
 33 #include <asm/addrspace.h>
 34 #include <asm/bootinfo.h>
 35 #include <asm/bugs.h>
 36 #include <asm/cache.h>
 37 #include <asm/cdmm.h>
 38 #include <asm/cpu.h>
 39 #include <asm/debug.h>
 40 #include <asm/dma-coherence.h>
 41 #include <asm/sections.h>
 42 #include <asm/setup.h>
 43 #include <asm/smp-ops.h>
 44 #include <asm/prom.h>
 45 
 46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
 47 const char __section(.appended_dtb) __appended_dtb[0x100000];
 48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
 49 
 50 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 51 
 52 EXPORT_SYMBOL(cpu_data);
 53 
 54 #ifdef CONFIG_VT
 55 struct screen_info screen_info;
 56 #endif
 57 
 58 /*
 59  * Setup information
 60  *
 61  * These are initialized so they are in the .data section
 62  */
 63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
 64 
 65 EXPORT_SYMBOL(mips_machtype);
 66 
 67 static char __initdata command_line[COMMAND_LINE_SIZE];
 68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
 69 
 70 #ifdef CONFIG_CMDLINE_BOOL
 71 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
 72 #else
 73 static const char builtin_cmdline[] __initconst = "";
 74 #endif
 75 
 76 /*
 77  * mips_io_port_base is the begin of the address space to which x86 style
 78  * I/O ports are mapped.
 79  */
 80 unsigned long mips_io_port_base = -1;
 81 EXPORT_SYMBOL(mips_io_port_base);
 82 
 83 static struct resource code_resource = { .name = "Kernel code", };
 84 static struct resource data_resource = { .name = "Kernel data", };
 85 static struct resource bss_resource = { .name = "Kernel bss", };
 86 
 87 static void *detect_magic __initdata = detect_memory_region;
 88 
 89 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 90 unsigned long ARCH_PFN_OFFSET;
 91 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
 92 #endif
 93 
 94 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
 95 {
 96         /*
 97          * Note: This function only exists for historical reason,
 98          * new code should use memblock_add or memblock_add_node instead.
 99          */
100 
101         /*
102          * If the region reaches the top of the physical address space, adjust
103          * the size slightly so that (start + size) doesn't overflow
104          */
105         if (start + size - 1 == PHYS_ADDR_MAX)
106                 --size;
107 
108         /* Sanity check */
109         if (start + size < start) {
110                 pr_warn("Trying to add an invalid memory region, skipped\n");
111                 return;
112         }
113 
114         if (start < PHYS_OFFSET)
115                 return;
116 
117         memblock_add(start, size);
118         /* Reserve any memory except the ordinary RAM ranges. */
119         switch (type) {
120         case BOOT_MEM_RAM:
121                 break;
122 
123         case BOOT_MEM_NOMAP: /* Discard the range from the system. */
124                 memblock_remove(start, size);
125                 break;
126 
127         default: /* Reserve the rest of the memory types at boot time */
128                 memblock_reserve(start, size);
129                 break;
130         }
131 }
132 
133 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
134 {
135         void *dm = &detect_magic;
136         phys_addr_t size;
137 
138         for (size = sz_min; size < sz_max; size <<= 1) {
139                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
140                         break;
141         }
142 
143         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
144                 ((unsigned long long) size) / SZ_1M,
145                 (unsigned long long) start,
146                 ((unsigned long long) sz_min) / SZ_1M,
147                 ((unsigned long long) sz_max) / SZ_1M);
148 
149         add_memory_region(start, size, BOOT_MEM_RAM);
150 }
151 
152 /*
153  * Manage initrd
154  */
155 #ifdef CONFIG_BLK_DEV_INITRD
156 
157 static int __init rd_start_early(char *p)
158 {
159         unsigned long start = memparse(p, &p);
160 
161 #ifdef CONFIG_64BIT
162         /* Guess if the sign extension was forgotten by bootloader */
163         if (start < XKPHYS)
164                 start = (int)start;
165 #endif
166         initrd_start = start;
167         initrd_end += start;
168         return 0;
169 }
170 early_param("rd_start", rd_start_early);
171 
172 static int __init rd_size_early(char *p)
173 {
174         initrd_end += memparse(p, &p);
175         return 0;
176 }
177 early_param("rd_size", rd_size_early);
178 
179 /* it returns the next free pfn after initrd */
180 static unsigned long __init init_initrd(void)
181 {
182         unsigned long end;
183 
184         /*
185          * Board specific code or command line parser should have
186          * already set up initrd_start and initrd_end. In these cases
187          * perfom sanity checks and use them if all looks good.
188          */
189         if (!initrd_start || initrd_end <= initrd_start)
190                 goto disable;
191 
192         if (initrd_start & ~PAGE_MASK) {
193                 pr_err("initrd start must be page aligned\n");
194                 goto disable;
195         }
196         if (initrd_start < PAGE_OFFSET) {
197                 pr_err("initrd start < PAGE_OFFSET\n");
198                 goto disable;
199         }
200 
201         /*
202          * Sanitize initrd addresses. For example firmware
203          * can't guess if they need to pass them through
204          * 64-bits values if the kernel has been built in pure
205          * 32-bit. We need also to switch from KSEG0 to XKPHYS
206          * addresses now, so the code can now safely use __pa().
207          */
208         end = __pa(initrd_end);
209         initrd_end = (unsigned long)__va(end);
210         initrd_start = (unsigned long)__va(__pa(initrd_start));
211 
212         ROOT_DEV = Root_RAM0;
213         return PFN_UP(end);
214 disable:
215         initrd_start = 0;
216         initrd_end = 0;
217         return 0;
218 }
219 
220 /* In some conditions (e.g. big endian bootloader with a little endian
221    kernel), the initrd might appear byte swapped.  Try to detect this and
222    byte swap it if needed.  */
223 static void __init maybe_bswap_initrd(void)
224 {
225 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
226         u64 buf;
227 
228         /* Check for CPIO signature */
229         if (!memcmp((void *)initrd_start, "070701", 6))
230                 return;
231 
232         /* Check for compressed initrd */
233         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
234                 return;
235 
236         /* Try again with a byte swapped header */
237         buf = swab64p((u64 *)initrd_start);
238         if (!memcmp(&buf, "070701", 6) ||
239             decompress_method((unsigned char *)(&buf), 8, NULL)) {
240                 unsigned long i;
241 
242                 pr_info("Byteswapped initrd detected\n");
243                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
244                         swab64s((u64 *)i);
245         }
246 #endif
247 }
248 
249 static void __init finalize_initrd(void)
250 {
251         unsigned long size = initrd_end - initrd_start;
252 
253         if (size == 0) {
254                 printk(KERN_INFO "Initrd not found or empty");
255                 goto disable;
256         }
257         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
258                 printk(KERN_ERR "Initrd extends beyond end of memory");
259                 goto disable;
260         }
261 
262         maybe_bswap_initrd();
263 
264         memblock_reserve(__pa(initrd_start), size);
265         initrd_below_start_ok = 1;
266 
267         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
268                 initrd_start, size);
269         return;
270 disable:
271         printk(KERN_CONT " - disabling initrd\n");
272         initrd_start = 0;
273         initrd_end = 0;
274 }
275 
276 #else  /* !CONFIG_BLK_DEV_INITRD */
277 
278 static unsigned long __init init_initrd(void)
279 {
280         return 0;
281 }
282 
283 #define finalize_initrd()       do {} while (0)
284 
285 #endif
286 
287 /*
288  * Initialize the bootmem allocator. It also setup initrd related data
289  * if needed.
290  */
291 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
292 
293 static void __init bootmem_init(void)
294 {
295         init_initrd();
296         finalize_initrd();
297 }
298 
299 #else  /* !CONFIG_SGI_IP27 */
300 
301 static void __init bootmem_init(void)
302 {
303         struct memblock_region *mem;
304         phys_addr_t ramstart, ramend;
305 
306         ramstart = memblock_start_of_DRAM();
307         ramend = memblock_end_of_DRAM();
308 
309         /*
310          * Sanity check any INITRD first. We don't take it into account
311          * for bootmem setup initially, rely on the end-of-kernel-code
312          * as our memory range starting point. Once bootmem is inited we
313          * will reserve the area used for the initrd.
314          */
315         init_initrd();
316 
317         /* Reserve memory occupied by kernel. */
318         memblock_reserve(__pa_symbol(&_text),
319                         __pa_symbol(&_end) - __pa_symbol(&_text));
320 
321         /* max_low_pfn is not a number of pages but the end pfn of low mem */
322 
323 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
324         ARCH_PFN_OFFSET = PFN_UP(ramstart);
325 #else
326         /*
327          * Reserve any memory between the start of RAM and PHYS_OFFSET
328          */
329         if (ramstart > PHYS_OFFSET)
330                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
331 
332         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
333                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
334                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
335                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
336         }
337 #endif
338 
339         min_low_pfn = ARCH_PFN_OFFSET;
340         max_pfn = PFN_DOWN(ramend);
341         for_each_memblock(memory, mem) {
342                 unsigned long start = memblock_region_memory_base_pfn(mem);
343                 unsigned long end = memblock_region_memory_end_pfn(mem);
344 
345                 /*
346                  * Skip highmem here so we get an accurate max_low_pfn if low
347                  * memory stops short of high memory.
348                  * If the region overlaps HIGHMEM_START, end is clipped so
349                  * max_pfn excludes the highmem portion.
350                  */
351                 if (memblock_is_nomap(mem))
352                         continue;
353                 if (start >= PFN_DOWN(HIGHMEM_START))
354                         continue;
355                 if (end > PFN_DOWN(HIGHMEM_START))
356                         end = PFN_DOWN(HIGHMEM_START);
357                 if (end > max_low_pfn)
358                         max_low_pfn = end;
359         }
360 
361         if (min_low_pfn >= max_low_pfn)
362                 panic("Incorrect memory mapping !!!");
363 
364         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
365 #ifdef CONFIG_HIGHMEM
366                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
367                 highend_pfn = max_pfn;
368 #else
369                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
370                 max_pfn = max_low_pfn;
371 #endif
372         }
373 
374 
375         /*
376          * In any case the added to the memblock memory regions
377          * (highmem/lowmem, available/reserved, etc) are considered
378          * as present, so inform sparsemem about them.
379          */
380         memblocks_present();
381 
382         /*
383          * Reserve initrd memory if needed.
384          */
385         finalize_initrd();
386 }
387 
388 #endif  /* CONFIG_SGI_IP27 */
389 
390 static int usermem __initdata;
391 
392 static int __init early_parse_mem(char *p)
393 {
394         phys_addr_t start, size;
395 
396         /*
397          * If a user specifies memory size, we
398          * blow away any automatically generated
399          * size.
400          */
401         if (usermem == 0) {
402                 usermem = 1;
403                 memblock_remove(memblock_start_of_DRAM(),
404                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
405         }
406         start = 0;
407         size = memparse(p, &p);
408         if (*p == '@')
409                 start = memparse(p + 1, &p);
410 
411         add_memory_region(start, size, BOOT_MEM_RAM);
412 
413         return 0;
414 }
415 early_param("mem", early_parse_mem);
416 
417 static int __init early_parse_memmap(char *p)
418 {
419         char *oldp;
420         u64 start_at, mem_size;
421 
422         if (!p)
423                 return -EINVAL;
424 
425         if (!strncmp(p, "exactmap", 8)) {
426                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
427                 return 0;
428         }
429 
430         oldp = p;
431         mem_size = memparse(p, &p);
432         if (p == oldp)
433                 return -EINVAL;
434 
435         if (*p == '@') {
436                 start_at = memparse(p+1, &p);
437                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
438         } else if (*p == '#') {
439                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
440                 return -EINVAL;
441         } else if (*p == '$') {
442                 start_at = memparse(p+1, &p);
443                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
444         } else {
445                 pr_err("\"memmap\" invalid format!\n");
446                 return -EINVAL;
447         }
448 
449         if (*p == '\0') {
450                 usermem = 1;
451                 return 0;
452         } else
453                 return -EINVAL;
454 }
455 early_param("memmap", early_parse_memmap);
456 
457 #ifdef CONFIG_PROC_VMCORE
458 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
459 static int __init early_parse_elfcorehdr(char *p)
460 {
461         struct memblock_region *mem;
462 
463         setup_elfcorehdr = memparse(p, &p);
464 
465          for_each_memblock(memory, mem) {
466                 unsigned long start = mem->base;
467                 unsigned long end = start + mem->size;
468                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
469                         /*
470                          * Reserve from the elf core header to the end of
471                          * the memory segment, that should all be kdump
472                          * reserved memory.
473                          */
474                         setup_elfcorehdr_size = end - setup_elfcorehdr;
475                         break;
476                 }
477         }
478         /*
479          * If we don't find it in the memory map, then we shouldn't
480          * have to worry about it, as the new kernel won't use it.
481          */
482         return 0;
483 }
484 early_param("elfcorehdr", early_parse_elfcorehdr);
485 #endif
486 
487 #ifdef CONFIG_KEXEC
488 static void __init mips_parse_crashkernel(void)
489 {
490         unsigned long long total_mem;
491         unsigned long long crash_size, crash_base;
492         int ret;
493 
494         total_mem = memblock_phys_mem_size();
495         ret = parse_crashkernel(boot_command_line, total_mem,
496                                 &crash_size, &crash_base);
497         if (ret != 0 || crash_size <= 0)
498                 return;
499 
500         if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 1)) {
501                 pr_warn("Invalid memory region reserved for crash kernel\n");
502                 return;
503         }
504 
505         crashk_res.start = crash_base;
506         crashk_res.end   = crash_base + crash_size - 1;
507 }
508 
509 static void __init request_crashkernel(struct resource *res)
510 {
511         int ret;
512 
513         if (crashk_res.start == crashk_res.end)
514                 return;
515 
516         ret = request_resource(res, &crashk_res);
517         if (!ret)
518                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
519                         (unsigned long)(resource_size(&crashk_res) >> 20),
520                         (unsigned long)(crashk_res.start  >> 20));
521 }
522 #else /* !defined(CONFIG_KEXEC)         */
523 static void __init mips_parse_crashkernel(void)
524 {
525 }
526 
527 static void __init request_crashkernel(struct resource *res)
528 {
529 }
530 #endif /* !defined(CONFIG_KEXEC)  */
531 
532 static void __init check_kernel_sections_mem(void)
533 {
534         phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
535         phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
536 
537         if (!memblock_is_region_memory(start, size)) {
538                 pr_info("Kernel sections are not in the memory maps\n");
539                 memblock_add(start, size);
540         }
541 }
542 
543 static void __init bootcmdline_append(const char *s, size_t max)
544 {
545         if (!s[0] || !max)
546                 return;
547 
548         if (boot_command_line[0])
549                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
550 
551         strlcat(boot_command_line, s, max);
552 }
553 
554 #ifdef CONFIG_OF_EARLY_FLATTREE
555 
556 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
557                                           int depth, void *data)
558 {
559         bool *dt_bootargs = data;
560         const char *p;
561         int l;
562 
563         if (depth != 1 || !data ||
564             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
565                 return 0;
566 
567         p = of_get_flat_dt_prop(node, "bootargs", &l);
568         if (p != NULL && l > 0) {
569                 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
570                 *dt_bootargs = true;
571         }
572 
573         return 1;
574 }
575 
576 #endif /* CONFIG_OF_EARLY_FLATTREE */
577 
578 static void __init bootcmdline_init(void)
579 {
580         bool dt_bootargs = false;
581 
582         /*
583          * If CMDLINE_OVERRIDE is enabled then initializing the command line is
584          * trivial - we simply use the built-in command line unconditionally &
585          * unmodified.
586          */
587         if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
588                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
589                 return;
590         }
591 
592         /*
593          * If the user specified a built-in command line &
594          * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
595          * prepended to arguments from the bootloader or DT so we'll copy them
596          * to the start of boot_command_line here. Otherwise, empty
597          * boot_command_line to undo anything early_init_dt_scan_chosen() did.
598          */
599         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
600                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
601         else
602                 boot_command_line[0] = 0;
603 
604 #ifdef CONFIG_OF_EARLY_FLATTREE
605         /*
606          * If we're configured to take boot arguments from DT, look for those
607          * now.
608          */
609         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
610             IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
611                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
612 #endif
613 
614         /*
615          * If we didn't get any arguments from DT (regardless of whether that's
616          * because we weren't configured to look for them, or because we looked
617          * & found none) then we'll take arguments from the bootloader.
618          * plat_mem_setup() should have filled arcs_cmdline with arguments from
619          * the bootloader.
620          */
621         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
622                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
623 
624         /*
625          * If the user specified a built-in command line & we didn't already
626          * prepend it, we append it to boot_command_line here.
627          */
628         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
629             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
630                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
631 }
632 
633 /*
634  * arch_mem_init - initialize memory management subsystem
635  *
636  *  o plat_mem_setup() detects the memory configuration and will record detected
637  *    memory areas using add_memory_region.
638  *
639  * At this stage the memory configuration of the system is known to the
640  * kernel but generic memory management system is still entirely uninitialized.
641  *
642  *  o bootmem_init()
643  *  o sparse_init()
644  *  o paging_init()
645  *  o dma_contiguous_reserve()
646  *
647  * At this stage the bootmem allocator is ready to use.
648  *
649  * NOTE: historically plat_mem_setup did the entire platform initialization.
650  *       This was rather impractical because it meant plat_mem_setup had to
651  * get away without any kind of memory allocator.  To keep old code from
652  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
653  * initialization hook for anything else was introduced.
654  */
655 static void __init arch_mem_init(char **cmdline_p)
656 {
657         /* call board setup routine */
658         plat_mem_setup();
659         memblock_set_bottom_up(true);
660 
661         bootcmdline_init();
662         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
663         *cmdline_p = command_line;
664 
665         parse_early_param();
666 
667         if (usermem)
668                 pr_info("User-defined physical RAM map overwrite\n");
669 
670         check_kernel_sections_mem();
671 
672         early_init_fdt_reserve_self();
673         early_init_fdt_scan_reserved_mem();
674 
675 #ifndef CONFIG_NUMA
676         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
677 #endif
678         bootmem_init();
679 
680         /*
681          * Prevent memblock from allocating high memory.
682          * This cannot be done before max_low_pfn is detected, so up
683          * to this point is possible to only reserve physical memory
684          * with memblock_reserve; memblock_alloc* can be used
685          * only after this point
686          */
687         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
688 
689 #ifdef CONFIG_PROC_VMCORE
690         if (setup_elfcorehdr && setup_elfcorehdr_size) {
691                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
692                        setup_elfcorehdr, setup_elfcorehdr_size);
693                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
694         }
695 #endif
696 
697         mips_parse_crashkernel();
698 #ifdef CONFIG_KEXEC
699         if (crashk_res.start != crashk_res.end)
700                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
701 #endif
702         device_tree_init();
703 
704         /*
705          * In order to reduce the possibility of kernel panic when failed to
706          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
707          * low memory as small as possible before plat_swiotlb_setup(), so
708          * make sparse_init() using top-down allocation.
709          */
710         memblock_set_bottom_up(false);
711         sparse_init();
712         memblock_set_bottom_up(true);
713 
714         plat_swiotlb_setup();
715 
716         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
717 
718         /* Reserve for hibernation. */
719         memblock_reserve(__pa_symbol(&__nosave_begin),
720                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
721 
722         fdt_init_reserved_mem();
723 
724         memblock_dump_all();
725 
726         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
727 }
728 
729 static void __init resource_init(void)
730 {
731         struct memblock_region *region;
732 
733         if (UNCAC_BASE != IO_BASE)
734                 return;
735 
736         code_resource.start = __pa_symbol(&_text);
737         code_resource.end = __pa_symbol(&_etext) - 1;
738         data_resource.start = __pa_symbol(&_etext);
739         data_resource.end = __pa_symbol(&_edata) - 1;
740         bss_resource.start = __pa_symbol(&__bss_start);
741         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
742 
743         for_each_memblock(memory, region) {
744                 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
745                 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
746                 struct resource *res;
747 
748                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
749                 if (!res)
750                         panic("%s: Failed to allocate %zu bytes\n", __func__,
751                               sizeof(struct resource));
752 
753                 res->start = start;
754                 res->end = end;
755                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
756                 res->name = "System RAM";
757 
758                 request_resource(&iomem_resource, res);
759 
760                 /*
761                  *  We don't know which RAM region contains kernel data,
762                  *  so we try it repeatedly and let the resource manager
763                  *  test it.
764                  */
765                 request_resource(res, &code_resource);
766                 request_resource(res, &data_resource);
767                 request_resource(res, &bss_resource);
768                 request_crashkernel(res);
769         }
770 }
771 
772 #ifdef CONFIG_SMP
773 static void __init prefill_possible_map(void)
774 {
775         int i, possible = num_possible_cpus();
776 
777         if (possible > nr_cpu_ids)
778                 possible = nr_cpu_ids;
779 
780         for (i = 0; i < possible; i++)
781                 set_cpu_possible(i, true);
782         for (; i < NR_CPUS; i++)
783                 set_cpu_possible(i, false);
784 
785         nr_cpu_ids = possible;
786 }
787 #else
788 static inline void prefill_possible_map(void) {}
789 #endif
790 
791 void __init setup_arch(char **cmdline_p)
792 {
793         cpu_probe();
794         mips_cm_probe();
795         prom_init();
796 
797         setup_early_fdc_console();
798 #ifdef CONFIG_EARLY_PRINTK
799         setup_early_printk();
800 #endif
801         cpu_report();
802         check_bugs_early();
803 
804 #if defined(CONFIG_VT)
805 #if defined(CONFIG_VGA_CONSOLE)
806         conswitchp = &vga_con;
807 #endif
808 #endif
809 
810         arch_mem_init(cmdline_p);
811         dmi_setup();
812 
813         resource_init();
814         plat_smp_setup();
815         prefill_possible_map();
816 
817         cpu_cache_init();
818         paging_init();
819 }
820 
821 unsigned long kernelsp[NR_CPUS];
822 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
823 
824 #ifdef CONFIG_USE_OF
825 unsigned long fw_passed_dtb;
826 #endif
827 
828 #ifdef CONFIG_DEBUG_FS
829 struct dentry *mips_debugfs_dir;
830 static int __init debugfs_mips(void)
831 {
832         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
833         return 0;
834 }
835 arch_initcall(debugfs_mips);
836 #endif
837 
838 #ifdef CONFIG_DMA_MAYBE_COHERENT
839 /* User defined DMA coherency from command line. */
840 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
841 EXPORT_SYMBOL_GPL(coherentio);
842 int hw_coherentio;      /* Actual hardware supported DMA coherency setting. */
843 
844 static int __init setcoherentio(char *str)
845 {
846         coherentio = IO_COHERENCE_ENABLED;
847         pr_info("Hardware DMA cache coherency (command line)\n");
848         return 0;
849 }
850 early_param("coherentio", setcoherentio);
851 
852 static int __init setnocoherentio(char *str)
853 {
854         coherentio = IO_COHERENCE_DISABLED;
855         pr_info("Software DMA cache coherency (command line)\n");
856         return 0;
857 }
858 early_param("nocoherentio", setnocoherentio);
859 #endif
860 

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