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

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

Version: ~ [ linux-5.16-rc3 ] ~ [ linux-5.15.5 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.82 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.162 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.218 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.256 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.291 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.293 ] ~ [ 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  * 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 
 32 #include <asm/addrspace.h>
 33 #include <asm/bootinfo.h>
 34 #include <asm/bugs.h>
 35 #include <asm/cache.h>
 36 #include <asm/cdmm.h>
 37 #include <asm/cpu.h>
 38 #include <asm/debug.h>
 39 #include <asm/dma-coherence.h>
 40 #include <asm/sections.h>
 41 #include <asm/setup.h>
 42 #include <asm/smp-ops.h>
 43 #include <asm/prom.h>
 44 
 45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
 46 const char __section(.appended_dtb) __appended_dtb[0x100000];
 47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
 48 
 49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
 50 
 51 EXPORT_SYMBOL(cpu_data);
 52 
 53 #ifdef CONFIG_VT
 54 struct screen_info screen_info;
 55 #endif
 56 
 57 /*
 58  * Setup information
 59  *
 60  * These are initialized so they are in the .data section
 61  */
 62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
 63 
 64 EXPORT_SYMBOL(mips_machtype);
 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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
 71 #else
 72 static const char builtin_cmdline[] __initconst = "";
 73 #endif
 74 
 75 /*
 76  * mips_io_port_base is the begin of the address space to which x86 style
 77  * I/O ports are mapped.
 78  */
 79 unsigned long mips_io_port_base = -1;
 80 EXPORT_SYMBOL(mips_io_port_base);
 81 
 82 static struct resource code_resource = { .name = "Kernel code", };
 83 static struct resource data_resource = { .name = "Kernel data", };
 84 static struct resource bss_resource = { .name = "Kernel bss", };
 85 
 86 static void *detect_magic __initdata = detect_memory_region;
 87 
 88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 89 unsigned long ARCH_PFN_OFFSET;
 90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
 91 #endif
 92 
 93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
 94 {
 95         /*
 96          * Note: This function only exists for historical reason,
 97          * new code should use memblock_add or memblock_add_node instead.
 98          */
 99 
100         /*
101          * If the region reaches the top of the physical address space, adjust
102          * the size slightly so that (start + size) doesn't overflow
103          */
104         if (start + size - 1 == PHYS_ADDR_MAX)
105                 --size;
106 
107         /* Sanity check */
108         if (start + size < start) {
109                 pr_warn("Trying to add an invalid memory region, skipped\n");
110                 return;
111         }
112 
113         if (start < PHYS_OFFSET)
114                 return;
115 
116         memblock_add(start, size);
117         /* Reserve any memory except the ordinary RAM ranges. */
118         switch (type) {
119         case BOOT_MEM_RAM:
120                 break;
121 
122         case BOOT_MEM_NOMAP: /* Discard the range from the system. */
123                 memblock_remove(start, size);
124                 break;
125 
126         default: /* Reserve the rest of the memory types at boot time */
127                 memblock_reserve(start, size);
128                 break;
129         }
130 }
131 
132 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
133 {
134         void *dm = &detect_magic;
135         phys_addr_t size;
136 
137         for (size = sz_min; size < sz_max; size <<= 1) {
138                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
139                         break;
140         }
141 
142         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
143                 ((unsigned long long) size) / SZ_1M,
144                 (unsigned long long) start,
145                 ((unsigned long long) sz_min) / SZ_1M,
146                 ((unsigned long long) sz_max) / SZ_1M);
147 
148         add_memory_region(start, size, BOOT_MEM_RAM);
149 }
150 
151 /*
152  * Manage initrd
153  */
154 #ifdef CONFIG_BLK_DEV_INITRD
155 
156 static int __init rd_start_early(char *p)
157 {
158         unsigned long start = memparse(p, &p);
159 
160 #ifdef CONFIG_64BIT
161         /* Guess if the sign extension was forgotten by bootloader */
162         if (start < XKPHYS)
163                 start = (int)start;
164 #endif
165         initrd_start = start;
166         initrd_end += start;
167         return 0;
168 }
169 early_param("rd_start", rd_start_early);
170 
171 static int __init rd_size_early(char *p)
172 {
173         initrd_end += memparse(p, &p);
174         return 0;
175 }
176 early_param("rd_size", rd_size_early);
177 
178 /* it returns the next free pfn after initrd */
179 static unsigned long __init init_initrd(void)
180 {
181         unsigned long end;
182 
183         /*
184          * Board specific code or command line parser should have
185          * already set up initrd_start and initrd_end. In these cases
186          * perfom sanity checks and use them if all looks good.
187          */
188         if (!initrd_start || initrd_end <= initrd_start)
189                 goto disable;
190 
191         if (initrd_start & ~PAGE_MASK) {
192                 pr_err("initrd start must be page aligned\n");
193                 goto disable;
194         }
195         if (initrd_start < PAGE_OFFSET) {
196                 pr_err("initrd start < PAGE_OFFSET\n");
197                 goto disable;
198         }
199 
200         /*
201          * Sanitize initrd addresses. For example firmware
202          * can't guess if they need to pass them through
203          * 64-bits values if the kernel has been built in pure
204          * 32-bit. We need also to switch from KSEG0 to XKPHYS
205          * addresses now, so the code can now safely use __pa().
206          */
207         end = __pa(initrd_end);
208         initrd_end = (unsigned long)__va(end);
209         initrd_start = (unsigned long)__va(__pa(initrd_start));
210 
211         ROOT_DEV = Root_RAM0;
212         return PFN_UP(end);
213 disable:
214         initrd_start = 0;
215         initrd_end = 0;
216         return 0;
217 }
218 
219 /* In some conditions (e.g. big endian bootloader with a little endian
220    kernel), the initrd might appear byte swapped.  Try to detect this and
221    byte swap it if needed.  */
222 static void __init maybe_bswap_initrd(void)
223 {
224 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
225         u64 buf;
226 
227         /* Check for CPIO signature */
228         if (!memcmp((void *)initrd_start, "070701", 6))
229                 return;
230 
231         /* Check for compressed initrd */
232         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
233                 return;
234 
235         /* Try again with a byte swapped header */
236         buf = swab64p((u64 *)initrd_start);
237         if (!memcmp(&buf, "070701", 6) ||
238             decompress_method((unsigned char *)(&buf), 8, NULL)) {
239                 unsigned long i;
240 
241                 pr_info("Byteswapped initrd detected\n");
242                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
243                         swab64s((u64 *)i);
244         }
245 #endif
246 }
247 
248 static void __init finalize_initrd(void)
249 {
250         unsigned long size = initrd_end - initrd_start;
251 
252         if (size == 0) {
253                 printk(KERN_INFO "Initrd not found or empty");
254                 goto disable;
255         }
256         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
257                 printk(KERN_ERR "Initrd extends beyond end of memory");
258                 goto disable;
259         }
260 
261         maybe_bswap_initrd();
262 
263         memblock_reserve(__pa(initrd_start), size);
264         initrd_below_start_ok = 1;
265 
266         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
267                 initrd_start, size);
268         return;
269 disable:
270         printk(KERN_CONT " - disabling initrd\n");
271         initrd_start = 0;
272         initrd_end = 0;
273 }
274 
275 #else  /* !CONFIG_BLK_DEV_INITRD */
276 
277 static unsigned long __init init_initrd(void)
278 {
279         return 0;
280 }
281 
282 #define finalize_initrd()       do {} while (0)
283 
284 #endif
285 
286 /*
287  * Initialize the bootmem allocator. It also setup initrd related data
288  * if needed.
289  */
290 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
291 
292 static void __init bootmem_init(void)
293 {
294         init_initrd();
295         finalize_initrd();
296 }
297 
298 #else  /* !CONFIG_SGI_IP27 */
299 
300 static void __init bootmem_init(void)
301 {
302         struct memblock_region *mem;
303         phys_addr_t ramstart, ramend;
304 
305         ramstart = memblock_start_of_DRAM();
306         ramend = memblock_end_of_DRAM();
307 
308         /*
309          * Sanity check any INITRD first. We don't take it into account
310          * for bootmem setup initially, rely on the end-of-kernel-code
311          * as our memory range starting point. Once bootmem is inited we
312          * will reserve the area used for the initrd.
313          */
314         init_initrd();
315 
316         /* Reserve memory occupied by kernel. */
317         memblock_reserve(__pa_symbol(&_text),
318                         __pa_symbol(&_end) - __pa_symbol(&_text));
319 
320         /* max_low_pfn is not a number of pages but the end pfn of low mem */
321 
322 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
323         ARCH_PFN_OFFSET = PFN_UP(ramstart);
324 #else
325         /*
326          * Reserve any memory between the start of RAM and PHYS_OFFSET
327          */
328         if (ramstart > PHYS_OFFSET)
329                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
330 
331         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
332                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
333                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
334                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
335         }
336 #endif
337 
338         min_low_pfn = ARCH_PFN_OFFSET;
339         max_pfn = PFN_DOWN(ramend);
340         for_each_memblock(memory, mem) {
341                 unsigned long start = memblock_region_memory_base_pfn(mem);
342                 unsigned long end = memblock_region_memory_end_pfn(mem);
343 
344                 /*
345                  * Skip highmem here so we get an accurate max_low_pfn if low
346                  * memory stops short of high memory.
347                  * If the region overlaps HIGHMEM_START, end is clipped so
348                  * max_pfn excludes the highmem portion.
349                  */
350                 if (memblock_is_nomap(mem))
351                         continue;
352                 if (start >= PFN_DOWN(HIGHMEM_START))
353                         continue;
354                 if (end > PFN_DOWN(HIGHMEM_START))
355                         end = PFN_DOWN(HIGHMEM_START);
356                 if (end > max_low_pfn)
357                         max_low_pfn = end;
358         }
359 
360         if (min_low_pfn >= max_low_pfn)
361                 panic("Incorrect memory mapping !!!");
362 
363         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
364 #ifdef CONFIG_HIGHMEM
365                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
366                 highend_pfn = max_pfn;
367 #else
368                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
369                 max_pfn = max_low_pfn;
370 #endif
371         }
372 
373 
374         /*
375          * In any case the added to the memblock memory regions
376          * (highmem/lowmem, available/reserved, etc) are considered
377          * as present, so inform sparsemem about them.
378          */
379         memblocks_present();
380 
381         /*
382          * Reserve initrd memory if needed.
383          */
384         finalize_initrd();
385 }
386 
387 #endif  /* CONFIG_SGI_IP27 */
388 
389 static int usermem __initdata;
390 
391 static int __init early_parse_mem(char *p)
392 {
393         phys_addr_t start, size;
394 
395         /*
396          * If a user specifies memory size, we
397          * blow away any automatically generated
398          * size.
399          */
400         if (usermem == 0) {
401                 usermem = 1;
402                 memblock_remove(memblock_start_of_DRAM(),
403                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
404         }
405         start = 0;
406         size = memparse(p, &p);
407         if (*p == '@')
408                 start = memparse(p + 1, &p);
409 
410         add_memory_region(start, size, BOOT_MEM_RAM);
411 
412         return 0;
413 }
414 early_param("mem", early_parse_mem);
415 
416 static int __init early_parse_memmap(char *p)
417 {
418         char *oldp;
419         u64 start_at, mem_size;
420 
421         if (!p)
422                 return -EINVAL;
423 
424         if (!strncmp(p, "exactmap", 8)) {
425                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
426                 return 0;
427         }
428 
429         oldp = p;
430         mem_size = memparse(p, &p);
431         if (p == oldp)
432                 return -EINVAL;
433 
434         if (*p == '@') {
435                 start_at = memparse(p+1, &p);
436                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
437         } else if (*p == '#') {
438                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
439                 return -EINVAL;
440         } else if (*p == '$') {
441                 start_at = memparse(p+1, &p);
442                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
443         } else {
444                 pr_err("\"memmap\" invalid format!\n");
445                 return -EINVAL;
446         }
447 
448         if (*p == '\0') {
449                 usermem = 1;
450                 return 0;
451         } else
452                 return -EINVAL;
453 }
454 early_param("memmap", early_parse_memmap);
455 
456 #ifdef CONFIG_PROC_VMCORE
457 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
458 static int __init early_parse_elfcorehdr(char *p)
459 {
460         struct memblock_region *mem;
461 
462         setup_elfcorehdr = memparse(p, &p);
463 
464          for_each_memblock(memory, mem) {
465                 unsigned long start = mem->base;
466                 unsigned long end = start + mem->size;
467                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
468                         /*
469                          * Reserve from the elf core header to the end of
470                          * the memory segment, that should all be kdump
471                          * reserved memory.
472                          */
473                         setup_elfcorehdr_size = end - setup_elfcorehdr;
474                         break;
475                 }
476         }
477         /*
478          * If we don't find it in the memory map, then we shouldn't
479          * have to worry about it, as the new kernel won't use it.
480          */
481         return 0;
482 }
483 early_param("elfcorehdr", early_parse_elfcorehdr);
484 #endif
485 
486 #ifdef CONFIG_KEXEC
487 static void __init mips_parse_crashkernel(void)
488 {
489         unsigned long long total_mem;
490         unsigned long long crash_size, crash_base;
491         int ret;
492 
493         total_mem = memblock_phys_mem_size();
494         ret = parse_crashkernel(boot_command_line, total_mem,
495                                 &crash_size, &crash_base);
496         if (ret != 0 || crash_size <= 0)
497                 return;
498 
499         if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
500                 pr_warn("Invalid memory region reserved for crash kernel\n");
501                 return;
502         }
503 
504         crashk_res.start = crash_base;
505         crashk_res.end   = crash_base + crash_size - 1;
506 }
507 
508 static void __init request_crashkernel(struct resource *res)
509 {
510         int ret;
511 
512         if (crashk_res.start == crashk_res.end)
513                 return;
514 
515         ret = request_resource(res, &crashk_res);
516         if (!ret)
517                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
518                         (unsigned long)((crashk_res.end -
519                                          crashk_res.start + 1) >> 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(char **cmdline_p)
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         extern void plat_mem_setup(void);
658 
659         /* call board setup routine */
660         plat_mem_setup();
661         memblock_set_bottom_up(true);
662 
663         bootcmdline_init(cmdline_p);
664         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
665         *cmdline_p = command_line;
666 
667         parse_early_param();
668 
669         if (usermem)
670                 pr_info("User-defined physical RAM map overwrite\n");
671 
672         check_kernel_sections_mem();
673 
674         early_init_fdt_reserve_self();
675         early_init_fdt_scan_reserved_mem();
676 
677 #ifndef CONFIG_NUMA
678         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
679 #endif
680         bootmem_init();
681 
682         /*
683          * Prevent memblock from allocating high memory.
684          * This cannot be done before max_low_pfn is detected, so up
685          * to this point is possible to only reserve physical memory
686          * with memblock_reserve; memblock_alloc* can be used
687          * only after this point
688          */
689         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
690 
691 #ifdef CONFIG_PROC_VMCORE
692         if (setup_elfcorehdr && setup_elfcorehdr_size) {
693                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
694                        setup_elfcorehdr, setup_elfcorehdr_size);
695                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
696         }
697 #endif
698 
699         mips_parse_crashkernel();
700 #ifdef CONFIG_KEXEC
701         if (crashk_res.start != crashk_res.end)
702                 memblock_reserve(crashk_res.start,
703                                  crashk_res.end - crashk_res.start + 1);
704 #endif
705         device_tree_init();
706         sparse_init();
707         plat_swiotlb_setup();
708 
709         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
710 
711         /* Reserve for hibernation. */
712         memblock_reserve(__pa_symbol(&__nosave_begin),
713                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
714 
715         fdt_init_reserved_mem();
716 
717         memblock_dump_all();
718 
719         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
720 }
721 
722 static void __init resource_init(void)
723 {
724         struct memblock_region *region;
725 
726         if (UNCAC_BASE != IO_BASE)
727                 return;
728 
729         code_resource.start = __pa_symbol(&_text);
730         code_resource.end = __pa_symbol(&_etext) - 1;
731         data_resource.start = __pa_symbol(&_etext);
732         data_resource.end = __pa_symbol(&_edata) - 1;
733         bss_resource.start = __pa_symbol(&__bss_start);
734         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
735 
736         for_each_memblock(memory, region) {
737                 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
738                 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
739                 struct resource *res;
740 
741                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
742                 if (!res)
743                         panic("%s: Failed to allocate %zu bytes\n", __func__,
744                               sizeof(struct resource));
745 
746                 res->start = start;
747                 res->end = end;
748                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
749                 res->name = "System RAM";
750 
751                 request_resource(&iomem_resource, res);
752 
753                 /*
754                  *  We don't know which RAM region contains kernel data,
755                  *  so we try it repeatedly and let the resource manager
756                  *  test it.
757                  */
758                 request_resource(res, &code_resource);
759                 request_resource(res, &data_resource);
760                 request_resource(res, &bss_resource);
761                 request_crashkernel(res);
762         }
763 }
764 
765 #ifdef CONFIG_SMP
766 static void __init prefill_possible_map(void)
767 {
768         int i, possible = num_possible_cpus();
769 
770         if (possible > nr_cpu_ids)
771                 possible = nr_cpu_ids;
772 
773         for (i = 0; i < possible; i++)
774                 set_cpu_possible(i, true);
775         for (; i < NR_CPUS; i++)
776                 set_cpu_possible(i, false);
777 
778         nr_cpu_ids = possible;
779 }
780 #else
781 static inline void prefill_possible_map(void) {}
782 #endif
783 
784 void __init setup_arch(char **cmdline_p)
785 {
786         cpu_probe();
787         mips_cm_probe();
788         prom_init();
789 
790         setup_early_fdc_console();
791 #ifdef CONFIG_EARLY_PRINTK
792         setup_early_printk();
793 #endif
794         cpu_report();
795         check_bugs_early();
796 
797 #if defined(CONFIG_VT)
798 #if defined(CONFIG_VGA_CONSOLE)
799         conswitchp = &vga_con;
800 #elif defined(CONFIG_DUMMY_CONSOLE)
801         conswitchp = &dummy_con;
802 #endif
803 #endif
804 
805         arch_mem_init(cmdline_p);
806 
807         resource_init();
808         plat_smp_setup();
809         prefill_possible_map();
810 
811         cpu_cache_init();
812         paging_init();
813 }
814 
815 unsigned long kernelsp[NR_CPUS];
816 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
817 
818 #ifdef CONFIG_USE_OF
819 unsigned long fw_passed_dtb;
820 #endif
821 
822 #ifdef CONFIG_DEBUG_FS
823 struct dentry *mips_debugfs_dir;
824 static int __init debugfs_mips(void)
825 {
826         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
827         return 0;
828 }
829 arch_initcall(debugfs_mips);
830 #endif
831 
832 #ifdef CONFIG_DMA_MAYBE_COHERENT
833 /* User defined DMA coherency from command line. */
834 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
835 EXPORT_SYMBOL_GPL(coherentio);
836 int hw_coherentio = 0;  /* Actual hardware supported DMA coherency setting. */
837 
838 static int __init setcoherentio(char *str)
839 {
840         coherentio = IO_COHERENCE_ENABLED;
841         pr_info("Hardware DMA cache coherency (command line)\n");
842         return 0;
843 }
844 early_param("coherentio", setcoherentio);
845 
846 static int __init setnocoherentio(char *str)
847 {
848         coherentio = IO_COHERENCE_DISABLED;
849         pr_info("Software DMA cache coherency (command line)\n");
850         return 0;
851 }
852 early_param("nocoherentio", setnocoherentio);
853 #endif
854 

~ [ 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