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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/cpu.h>
15 #include <linux/delay.h>
16 #include <linux/ioport.h>
17 #include <linux/export.h>
18 #include <linux/screen_info.h>
19 #include <linux/memblock.h>
20 #include <linux/initrd.h>
21 #include <linux/root_dev.h>
22 #include <linux/highmem.h>
23 #include <linux/console.h>
24 #include <linux/pfn.h>
25 #include <linux/debugfs.h>
26 #include <linux/kexec.h>
27 #include <linux/sizes.h>
28 #include <linux/device.h>
29 #include <linux/dma-map-ops.h>
30 #include <linux/decompress/generic.h>
31 #include <linux/of_fdt.h>
32 #include <linux/of_reserved_mem.h>
33 #include <linux/dmi.h>
34 
35 #include <asm/addrspace.h>
36 #include <asm/bootinfo.h>
37 #include <asm/bugs.h>
38 #include <asm/cache.h>
39 #include <asm/cdmm.h>
40 #include <asm/cpu.h>
41 #include <asm/debug.h>
42 #include <asm/dma-coherence.h>
43 #include <asm/sections.h>
44 #include <asm/setup.h>
45 #include <asm/smp-ops.h>
46 #include <asm/prom.h>
47 
48 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
49 const char __section(".appended_dtb") __appended_dtb[0x100000];
50 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
51 
52 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
53 
54 EXPORT_SYMBOL(cpu_data);
55 
56 #ifdef CONFIG_VT
57 struct screen_info screen_info;
58 #endif
59 
60 /*
61  * Setup information
62  *
63  * These are initialized so they are in the .data section
64  */
65 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
66 
67 EXPORT_SYMBOL(mips_machtype);
68 
69 static char __initdata command_line[COMMAND_LINE_SIZE];
70 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
71 
72 #ifdef CONFIG_CMDLINE_BOOL
73 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
74 #else
75 static const char builtin_cmdline[] __initconst = "";
76 #endif
77 
78 /*
79  * mips_io_port_base is the begin of the address space to which x86 style
80  * I/O ports are mapped.
81  */
82 unsigned long mips_io_port_base = -1;
83 EXPORT_SYMBOL(mips_io_port_base);
84 
85 static struct resource code_resource = { .name = "Kernel code", };
86 static struct resource data_resource = { .name = "Kernel data", };
87 static struct resource bss_resource = { .name = "Kernel bss", };
88 
89 static void *detect_magic __initdata = detect_memory_region;
90 
91 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
92 unsigned long ARCH_PFN_OFFSET;
93 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
94 #endif
95 
detect_memory_region(phys_addr_t start,phys_addr_t sz_min,phys_addr_t sz_max)96 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
97 {
98 	void *dm = &detect_magic;
99 	phys_addr_t size;
100 
101 	for (size = sz_min; size < sz_max; size <<= 1) {
102 		if (!memcmp(dm, dm + size, sizeof(detect_magic)))
103 			break;
104 	}
105 
106 	pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
107 		((unsigned long long) size) / SZ_1M,
108 		(unsigned long long) start,
109 		((unsigned long long) sz_min) / SZ_1M,
110 		((unsigned long long) sz_max) / SZ_1M);
111 
112 	memblock_add(start, size);
113 }
114 
115 /*
116  * Manage initrd
117  */
118 #ifdef CONFIG_BLK_DEV_INITRD
119 
rd_start_early(char * p)120 static int __init rd_start_early(char *p)
121 {
122 	unsigned long start = memparse(p, &p);
123 
124 #ifdef CONFIG_64BIT
125 	/* Guess if the sign extension was forgotten by bootloader */
126 	if (start < XKPHYS)
127 		start = (int)start;
128 #endif
129 	initrd_start = start;
130 	initrd_end += start;
131 	return 0;
132 }
133 early_param("rd_start", rd_start_early);
134 
rd_size_early(char * p)135 static int __init rd_size_early(char *p)
136 {
137 	initrd_end += memparse(p, &p);
138 	return 0;
139 }
140 early_param("rd_size", rd_size_early);
141 
142 /* it returns the next free pfn after initrd */
init_initrd(void)143 static unsigned long __init init_initrd(void)
144 {
145 	unsigned long end;
146 
147 	/*
148 	 * Board specific code or command line parser should have
149 	 * already set up initrd_start and initrd_end. In these cases
150 	 * perfom sanity checks and use them if all looks good.
151 	 */
152 	if (!initrd_start || initrd_end <= initrd_start)
153 		goto disable;
154 
155 	if (initrd_start & ~PAGE_MASK) {
156 		pr_err("initrd start must be page aligned\n");
157 		goto disable;
158 	}
159 
160 	/*
161 	 * Sanitize initrd addresses. For example firmware
162 	 * can't guess if they need to pass them through
163 	 * 64-bits values if the kernel has been built in pure
164 	 * 32-bit. We need also to switch from KSEG0 to XKPHYS
165 	 * addresses now, so the code can now safely use __pa().
166 	 */
167 	end = __pa(initrd_end);
168 	initrd_end = (unsigned long)__va(end);
169 	initrd_start = (unsigned long)__va(__pa(initrd_start));
170 
171 	if (initrd_start < PAGE_OFFSET) {
172 		pr_err("initrd start < PAGE_OFFSET\n");
173 		goto disable;
174 	}
175 
176 	ROOT_DEV = Root_RAM0;
177 	return PFN_UP(end);
178 disable:
179 	initrd_start = 0;
180 	initrd_end = 0;
181 	return 0;
182 }
183 
184 /* In some conditions (e.g. big endian bootloader with a little endian
185    kernel), the initrd might appear byte swapped.  Try to detect this and
186    byte swap it if needed.  */
maybe_bswap_initrd(void)187 static void __init maybe_bswap_initrd(void)
188 {
189 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
190 	u64 buf;
191 
192 	/* Check for CPIO signature */
193 	if (!memcmp((void *)initrd_start, "070701", 6))
194 		return;
195 
196 	/* Check for compressed initrd */
197 	if (decompress_method((unsigned char *)initrd_start, 8, NULL))
198 		return;
199 
200 	/* Try again with a byte swapped header */
201 	buf = swab64p((u64 *)initrd_start);
202 	if (!memcmp(&buf, "070701", 6) ||
203 	    decompress_method((unsigned char *)(&buf), 8, NULL)) {
204 		unsigned long i;
205 
206 		pr_info("Byteswapped initrd detected\n");
207 		for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
208 			swab64s((u64 *)i);
209 	}
210 #endif
211 }
212 
finalize_initrd(void)213 static void __init finalize_initrd(void)
214 {
215 	unsigned long size = initrd_end - initrd_start;
216 
217 	if (size == 0) {
218 		printk(KERN_INFO "Initrd not found or empty");
219 		goto disable;
220 	}
221 	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
222 		printk(KERN_ERR "Initrd extends beyond end of memory");
223 		goto disable;
224 	}
225 
226 	maybe_bswap_initrd();
227 
228 	memblock_reserve(__pa(initrd_start), size);
229 	initrd_below_start_ok = 1;
230 
231 	pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
232 		initrd_start, size);
233 	return;
234 disable:
235 	printk(KERN_CONT " - disabling initrd\n");
236 	initrd_start = 0;
237 	initrd_end = 0;
238 }
239 
240 #else  /* !CONFIG_BLK_DEV_INITRD */
241 
init_initrd(void)242 static unsigned long __init init_initrd(void)
243 {
244 	return 0;
245 }
246 
247 #define finalize_initrd()	do {} while (0)
248 
249 #endif
250 
251 /*
252  * Initialize the bootmem allocator. It also setup initrd related data
253  * if needed.
254  */
255 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
256 
bootmem_init(void)257 static void __init bootmem_init(void)
258 {
259 	init_initrd();
260 	finalize_initrd();
261 }
262 
263 #else  /* !CONFIG_SGI_IP27 */
264 
bootmem_init(void)265 static void __init bootmem_init(void)
266 {
267 	phys_addr_t ramstart, ramend;
268 	unsigned long start, end;
269 	int i;
270 
271 	ramstart = memblock_start_of_DRAM();
272 	ramend = memblock_end_of_DRAM();
273 
274 	/*
275 	 * Sanity check any INITRD first. We don't take it into account
276 	 * for bootmem setup initially, rely on the end-of-kernel-code
277 	 * as our memory range starting point. Once bootmem is inited we
278 	 * will reserve the area used for the initrd.
279 	 */
280 	init_initrd();
281 
282 	/* Reserve memory occupied by kernel. */
283 	memblock_reserve(__pa_symbol(&_text),
284 			__pa_symbol(&_end) - __pa_symbol(&_text));
285 
286 	/* max_low_pfn is not a number of pages but the end pfn of low mem */
287 
288 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
289 	ARCH_PFN_OFFSET = PFN_UP(ramstart);
290 #else
291 	/*
292 	 * Reserve any memory between the start of RAM and PHYS_OFFSET
293 	 */
294 	if (ramstart > PHYS_OFFSET)
295 		memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
296 
297 	if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
298 		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
299 			(unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
300 			(unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
301 	}
302 #endif
303 
304 	min_low_pfn = ARCH_PFN_OFFSET;
305 	max_pfn = PFN_DOWN(ramend);
306 	for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
307 		/*
308 		 * Skip highmem here so we get an accurate max_low_pfn if low
309 		 * memory stops short of high memory.
310 		 * If the region overlaps HIGHMEM_START, end is clipped so
311 		 * max_pfn excludes the highmem portion.
312 		 */
313 		if (start >= PFN_DOWN(HIGHMEM_START))
314 			continue;
315 		if (end > PFN_DOWN(HIGHMEM_START))
316 			end = PFN_DOWN(HIGHMEM_START);
317 		if (end > max_low_pfn)
318 			max_low_pfn = end;
319 	}
320 
321 	if (min_low_pfn >= max_low_pfn)
322 		panic("Incorrect memory mapping !!!");
323 
324 	if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
325 		max_low_pfn = PFN_DOWN(HIGHMEM_START);
326 #ifdef CONFIG_HIGHMEM
327 		highstart_pfn = max_low_pfn;
328 		highend_pfn = max_pfn;
329 #else
330 		max_pfn = max_low_pfn;
331 #endif
332 	}
333 
334 	/*
335 	 * Reserve initrd memory if needed.
336 	 */
337 	finalize_initrd();
338 }
339 
340 #endif	/* CONFIG_SGI_IP27 */
341 
342 static int usermem __initdata;
343 
early_parse_mem(char * p)344 static int __init early_parse_mem(char *p)
345 {
346 	phys_addr_t start, size;
347 
348 	/*
349 	 * If a user specifies memory size, we
350 	 * blow away any automatically generated
351 	 * size.
352 	 */
353 	if (usermem == 0) {
354 		usermem = 1;
355 		memblock_remove(memblock_start_of_DRAM(),
356 			memblock_end_of_DRAM() - memblock_start_of_DRAM());
357 	}
358 	start = 0;
359 	size = memparse(p, &p);
360 	if (*p == '@')
361 		start = memparse(p + 1, &p);
362 
363 	memblock_add(start, size);
364 
365 	return 0;
366 }
367 early_param("mem", early_parse_mem);
368 
early_parse_memmap(char * p)369 static int __init early_parse_memmap(char *p)
370 {
371 	char *oldp;
372 	u64 start_at, mem_size;
373 
374 	if (!p)
375 		return -EINVAL;
376 
377 	if (!strncmp(p, "exactmap", 8)) {
378 		pr_err("\"memmap=exactmap\" invalid on MIPS\n");
379 		return 0;
380 	}
381 
382 	oldp = p;
383 	mem_size = memparse(p, &p);
384 	if (p == oldp)
385 		return -EINVAL;
386 
387 	if (*p == '@') {
388 		start_at = memparse(p+1, &p);
389 		memblock_add(start_at, mem_size);
390 	} else if (*p == '#') {
391 		pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
392 		return -EINVAL;
393 	} else if (*p == '$') {
394 		start_at = memparse(p+1, &p);
395 		memblock_add(start_at, mem_size);
396 		memblock_reserve(start_at, mem_size);
397 	} else {
398 		pr_err("\"memmap\" invalid format!\n");
399 		return -EINVAL;
400 	}
401 
402 	if (*p == '\0') {
403 		usermem = 1;
404 		return 0;
405 	} else
406 		return -EINVAL;
407 }
408 early_param("memmap", early_parse_memmap);
409 
410 #ifdef CONFIG_PROC_VMCORE
411 static unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
early_parse_elfcorehdr(char * p)412 static int __init early_parse_elfcorehdr(char *p)
413 {
414 	phys_addr_t start, end;
415 	u64 i;
416 
417 	setup_elfcorehdr = memparse(p, &p);
418 
419 	for_each_mem_range(i, &start, &end) {
420 		if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
421 			/*
422 			 * Reserve from the elf core header to the end of
423 			 * the memory segment, that should all be kdump
424 			 * reserved memory.
425 			 */
426 			setup_elfcorehdr_size = end - setup_elfcorehdr;
427 			break;
428 		}
429 	}
430 	/*
431 	 * If we don't find it in the memory map, then we shouldn't
432 	 * have to worry about it, as the new kernel won't use it.
433 	 */
434 	return 0;
435 }
436 early_param("elfcorehdr", early_parse_elfcorehdr);
437 #endif
438 
439 #ifdef CONFIG_KEXEC
440 
441 /* 64M alignment for crash kernel regions */
442 #define CRASH_ALIGN	SZ_64M
443 #define CRASH_ADDR_MAX	SZ_512M
444 
mips_parse_crashkernel(void)445 static void __init mips_parse_crashkernel(void)
446 {
447 	unsigned long long total_mem;
448 	unsigned long long crash_size, crash_base;
449 	int ret;
450 
451 	total_mem = memblock_phys_mem_size();
452 	ret = parse_crashkernel(boot_command_line, total_mem,
453 				&crash_size, &crash_base);
454 	if (ret != 0 || crash_size <= 0)
455 		return;
456 
457 	if (crash_base <= 0) {
458 		crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
459 							crash_size, CRASH_ALIGN);
460 		if (!crash_base) {
461 			pr_warn("crashkernel reservation failed - No suitable area found.\n");
462 			return;
463 		}
464 	} else {
465 		unsigned long long start;
466 
467 		start = memblock_find_in_range(crash_base, crash_base + crash_size,
468 						crash_size, 1);
469 		if (start != crash_base) {
470 			pr_warn("Invalid memory region reserved for crash kernel\n");
471 			return;
472 		}
473 	}
474 
475 	crashk_res.start = crash_base;
476 	crashk_res.end	 = crash_base + crash_size - 1;
477 }
478 
request_crashkernel(struct resource * res)479 static void __init request_crashkernel(struct resource *res)
480 {
481 	int ret;
482 
483 	if (crashk_res.start == crashk_res.end)
484 		return;
485 
486 	ret = request_resource(res, &crashk_res);
487 	if (!ret)
488 		pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
489 			(unsigned long)(resource_size(&crashk_res) >> 20),
490 			(unsigned long)(crashk_res.start  >> 20));
491 }
492 #else /* !defined(CONFIG_KEXEC)		*/
mips_parse_crashkernel(void)493 static void __init mips_parse_crashkernel(void)
494 {
495 }
496 
request_crashkernel(struct resource * res)497 static void __init request_crashkernel(struct resource *res)
498 {
499 }
500 #endif /* !defined(CONFIG_KEXEC)  */
501 
check_kernel_sections_mem(void)502 static void __init check_kernel_sections_mem(void)
503 {
504 	phys_addr_t start = __pa_symbol(&_text);
505 	phys_addr_t size = __pa_symbol(&_end) - start;
506 
507 	if (!memblock_is_region_memory(start, size)) {
508 		pr_info("Kernel sections are not in the memory maps\n");
509 		memblock_add(start, size);
510 	}
511 }
512 
bootcmdline_append(const char * s,size_t max)513 static void __init bootcmdline_append(const char *s, size_t max)
514 {
515 	if (!s[0] || !max)
516 		return;
517 
518 	if (boot_command_line[0])
519 		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
520 
521 	strlcat(boot_command_line, s, max);
522 }
523 
524 #ifdef CONFIG_OF_EARLY_FLATTREE
525 
bootcmdline_scan_chosen(unsigned long node,const char * uname,int depth,void * data)526 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
527 					  int depth, void *data)
528 {
529 	bool *dt_bootargs = data;
530 	const char *p;
531 	int l;
532 
533 	if (depth != 1 || !data ||
534 	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
535 		return 0;
536 
537 	p = of_get_flat_dt_prop(node, "bootargs", &l);
538 	if (p != NULL && l > 0) {
539 		bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
540 		*dt_bootargs = true;
541 	}
542 
543 	return 1;
544 }
545 
546 #endif /* CONFIG_OF_EARLY_FLATTREE */
547 
bootcmdline_init(void)548 static void __init bootcmdline_init(void)
549 {
550 	bool dt_bootargs = false;
551 
552 	/*
553 	 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
554 	 * trivial - we simply use the built-in command line unconditionally &
555 	 * unmodified.
556 	 */
557 	if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
558 		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
559 		return;
560 	}
561 
562 	/*
563 	 * If the user specified a built-in command line &
564 	 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
565 	 * prepended to arguments from the bootloader or DT so we'll copy them
566 	 * to the start of boot_command_line here. Otherwise, empty
567 	 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
568 	 */
569 	if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
570 		strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
571 	else
572 		boot_command_line[0] = 0;
573 
574 #ifdef CONFIG_OF_EARLY_FLATTREE
575 	/*
576 	 * If we're configured to take boot arguments from DT, look for those
577 	 * now.
578 	 */
579 	if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
580 	    IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
581 		of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
582 #endif
583 
584 	/*
585 	 * If we didn't get any arguments from DT (regardless of whether that's
586 	 * because we weren't configured to look for them, or because we looked
587 	 * & found none) then we'll take arguments from the bootloader.
588 	 * plat_mem_setup() should have filled arcs_cmdline with arguments from
589 	 * the bootloader.
590 	 */
591 	if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
592 		bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
593 
594 	/*
595 	 * If the user specified a built-in command line & we didn't already
596 	 * prepend it, we append it to boot_command_line here.
597 	 */
598 	if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
599 	    !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
600 		bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
601 }
602 
603 /*
604  * arch_mem_init - initialize memory management subsystem
605  *
606  *  o plat_mem_setup() detects the memory configuration and will record detected
607  *    memory areas using memblock_add.
608  *
609  * At this stage the memory configuration of the system is known to the
610  * kernel but generic memory management system is still entirely uninitialized.
611  *
612  *  o bootmem_init()
613  *  o sparse_init()
614  *  o paging_init()
615  *  o dma_contiguous_reserve()
616  *
617  * At this stage the bootmem allocator is ready to use.
618  *
619  * NOTE: historically plat_mem_setup did the entire platform initialization.
620  *	 This was rather impractical because it meant plat_mem_setup had to
621  * get away without any kind of memory allocator.  To keep old code from
622  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
623  * initialization hook for anything else was introduced.
624  */
arch_mem_init(char ** cmdline_p)625 static void __init arch_mem_init(char **cmdline_p)
626 {
627 	/* call board setup routine */
628 	plat_mem_setup();
629 	memblock_set_bottom_up(true);
630 
631 	bootcmdline_init();
632 	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
633 	*cmdline_p = command_line;
634 
635 	parse_early_param();
636 
637 	if (usermem)
638 		pr_info("User-defined physical RAM map overwrite\n");
639 
640 	check_kernel_sections_mem();
641 
642 	early_init_fdt_reserve_self();
643 	early_init_fdt_scan_reserved_mem();
644 
645 #ifndef CONFIG_NUMA
646 	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
647 #endif
648 	bootmem_init();
649 
650 	/*
651 	 * Prevent memblock from allocating high memory.
652 	 * This cannot be done before max_low_pfn is detected, so up
653 	 * to this point is possible to only reserve physical memory
654 	 * with memblock_reserve; memblock_alloc* can be used
655 	 * only after this point
656 	 */
657 	memblock_set_current_limit(PFN_PHYS(max_low_pfn));
658 
659 #ifdef CONFIG_PROC_VMCORE
660 	if (setup_elfcorehdr && setup_elfcorehdr_size) {
661 		printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
662 		       setup_elfcorehdr, setup_elfcorehdr_size);
663 		memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
664 	}
665 #endif
666 
667 	mips_parse_crashkernel();
668 #ifdef CONFIG_KEXEC
669 	if (crashk_res.start != crashk_res.end)
670 		memblock_reserve(crashk_res.start, resource_size(&crashk_res));
671 #endif
672 	device_tree_init();
673 
674 	/*
675 	 * In order to reduce the possibility of kernel panic when failed to
676 	 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
677 	 * low memory as small as possible before plat_swiotlb_setup(), so
678 	 * make sparse_init() using top-down allocation.
679 	 */
680 	memblock_set_bottom_up(false);
681 	sparse_init();
682 	memblock_set_bottom_up(true);
683 
684 	plat_swiotlb_setup();
685 
686 	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
687 
688 	/* Reserve for hibernation. */
689 	memblock_reserve(__pa_symbol(&__nosave_begin),
690 		__pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
691 
692 	fdt_init_reserved_mem();
693 
694 	memblock_dump_all();
695 
696 	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
697 }
698 
resource_init(void)699 static void __init resource_init(void)
700 {
701 	phys_addr_t start, end;
702 	u64 i;
703 
704 	if (UNCAC_BASE != IO_BASE)
705 		return;
706 
707 	code_resource.start = __pa_symbol(&_text);
708 	code_resource.end = __pa_symbol(&_etext) - 1;
709 	data_resource.start = __pa_symbol(&_etext);
710 	data_resource.end = __pa_symbol(&_edata) - 1;
711 	bss_resource.start = __pa_symbol(&__bss_start);
712 	bss_resource.end = __pa_symbol(&__bss_stop) - 1;
713 
714 	for_each_mem_range(i, &start, &end) {
715 		struct resource *res;
716 
717 		res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
718 		if (!res)
719 			panic("%s: Failed to allocate %zu bytes\n", __func__,
720 			      sizeof(struct resource));
721 
722 		res->start = start;
723 		/*
724 		 * In memblock, end points to the first byte after the
725 		 * range while in resourses, end points to the last byte in
726 		 * the range.
727 		 */
728 		res->end = end - 1;
729 		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
730 		res->name = "System RAM";
731 
732 		request_resource(&iomem_resource, res);
733 
734 		/*
735 		 *  We don't know which RAM region contains kernel data,
736 		 *  so we try it repeatedly and let the resource manager
737 		 *  test it.
738 		 */
739 		request_resource(res, &code_resource);
740 		request_resource(res, &data_resource);
741 		request_resource(res, &bss_resource);
742 		request_crashkernel(res);
743 	}
744 }
745 
746 #ifdef CONFIG_SMP
prefill_possible_map(void)747 static void __init prefill_possible_map(void)
748 {
749 	int i, possible = num_possible_cpus();
750 
751 	if (possible > nr_cpu_ids)
752 		possible = nr_cpu_ids;
753 
754 	for (i = 0; i < possible; i++)
755 		set_cpu_possible(i, true);
756 	for (; i < NR_CPUS; i++)
757 		set_cpu_possible(i, false);
758 
759 	nr_cpu_ids = possible;
760 }
761 #else
prefill_possible_map(void)762 static inline void prefill_possible_map(void) {}
763 #endif
764 
setup_arch(char ** cmdline_p)765 void __init setup_arch(char **cmdline_p)
766 {
767 	cpu_probe();
768 	mips_cm_probe();
769 	prom_init();
770 
771 	setup_early_fdc_console();
772 #ifdef CONFIG_EARLY_PRINTK
773 	setup_early_printk();
774 #endif
775 	cpu_report();
776 	check_bugs_early();
777 
778 #if defined(CONFIG_VT)
779 #if defined(CONFIG_VGA_CONSOLE)
780 	conswitchp = &vga_con;
781 #endif
782 #endif
783 
784 	arch_mem_init(cmdline_p);
785 	dmi_setup();
786 
787 	resource_init();
788 	plat_smp_setup();
789 	prefill_possible_map();
790 
791 	cpu_cache_init();
792 	paging_init();
793 }
794 
795 unsigned long kernelsp[NR_CPUS];
796 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
797 
798 #ifdef CONFIG_USE_OF
799 unsigned long fw_passed_dtb;
800 #endif
801 
802 #ifdef CONFIG_DEBUG_FS
803 struct dentry *mips_debugfs_dir;
debugfs_mips(void)804 static int __init debugfs_mips(void)
805 {
806 	mips_debugfs_dir = debugfs_create_dir("mips", NULL);
807 	return 0;
808 }
809 arch_initcall(debugfs_mips);
810 #endif
811 
812 #ifdef CONFIG_DMA_MAYBE_COHERENT
813 /* User defined DMA coherency from command line. */
814 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
815 EXPORT_SYMBOL_GPL(coherentio);
816 int hw_coherentio;	/* Actual hardware supported DMA coherency setting. */
817 
setcoherentio(char * str)818 static int __init setcoherentio(char *str)
819 {
820 	coherentio = IO_COHERENCE_ENABLED;
821 	pr_info("Hardware DMA cache coherency (command line)\n");
822 	return 0;
823 }
824 early_param("coherentio", setcoherentio);
825 
setnocoherentio(char * str)826 static int __init setnocoherentio(char *str)
827 {
828 	coherentio = IO_COHERENCE_DISABLED;
829 	pr_info("Software DMA cache coherency (command line)\n");
830 	return 0;
831 }
832 early_param("nocoherentio", setnocoherentio);
833 #endif
834 
arch_cpu_finalize_init(void)835 void __init arch_cpu_finalize_init(void)
836 {
837 	unsigned int cpu = smp_processor_id();
838 
839 	cpu_data[cpu].udelay_val = loops_per_jiffy;
840 	check_bugs32();
841 
842 	if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
843 		check_bugs64();
844 }
845