xref: /openbmc/linux/arch/mips/kernel/setup.c (revision b830f94f)
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 struct boot_mem_map boot_mem_map;
67 
68 static char __initdata command_line[COMMAND_LINE_SIZE];
69 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
70 
71 #ifdef CONFIG_CMDLINE_BOOL
72 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
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 const 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 	int x = boot_mem_map.nr_map;
96 	int i;
97 
98 	/*
99 	 * If the region reaches the top of the physical address space, adjust
100 	 * the size slightly so that (start + size) doesn't overflow
101 	 */
102 	if (start + size - 1 == PHYS_ADDR_MAX)
103 		--size;
104 
105 	/* Sanity check */
106 	if (start + size < start) {
107 		pr_warn("Trying to add an invalid memory region, skipped\n");
108 		return;
109 	}
110 
111 	/*
112 	 * Try to merge with existing entry, if any.
113 	 */
114 	for (i = 0; i < boot_mem_map.nr_map; i++) {
115 		struct boot_mem_map_entry *entry = boot_mem_map.map + i;
116 		unsigned long top;
117 
118 		if (entry->type != type)
119 			continue;
120 
121 		if (start + size < entry->addr)
122 			continue;			/* no overlap */
123 
124 		if (entry->addr + entry->size < start)
125 			continue;			/* no overlap */
126 
127 		top = max(entry->addr + entry->size, start + size);
128 		entry->addr = min(entry->addr, start);
129 		entry->size = top - entry->addr;
130 
131 		return;
132 	}
133 
134 	if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
135 		pr_err("Ooops! Too many entries in the memory map!\n");
136 		return;
137 	}
138 
139 	boot_mem_map.map[x].addr = start;
140 	boot_mem_map.map[x].size = size;
141 	boot_mem_map.map[x].type = type;
142 	boot_mem_map.nr_map++;
143 }
144 
145 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
146 {
147 	void *dm = &detect_magic;
148 	phys_addr_t size;
149 
150 	for (size = sz_min; size < sz_max; size <<= 1) {
151 		if (!memcmp(dm, dm + size, sizeof(detect_magic)))
152 			break;
153 	}
154 
155 	pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
156 		((unsigned long long) size) / SZ_1M,
157 		(unsigned long long) start,
158 		((unsigned long long) sz_min) / SZ_1M,
159 		((unsigned long long) sz_max) / SZ_1M);
160 
161 	add_memory_region(start, size, BOOT_MEM_RAM);
162 }
163 
164 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
165 							  phys_addr_t size)
166 {
167 	int i;
168 	bool in_ram = false, free = true;
169 
170 	for (i = 0; i < boot_mem_map.nr_map; i++) {
171 		phys_addr_t start_, end_;
172 
173 		start_ = boot_mem_map.map[i].addr;
174 		end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
175 
176 		switch (boot_mem_map.map[i].type) {
177 		case BOOT_MEM_RAM:
178 			if (start >= start_ && start + size <= end_)
179 				in_ram = true;
180 			break;
181 		case BOOT_MEM_RESERVED:
182 		case BOOT_MEM_NOMAP:
183 			if ((start >= start_ && start < end_) ||
184 			    (start < start_ && start + size >= start_))
185 				free = false;
186 			break;
187 		default:
188 			continue;
189 		}
190 	}
191 
192 	return in_ram && free;
193 }
194 
195 static void __init print_memory_map(void)
196 {
197 	int i;
198 	const int field = 2 * sizeof(unsigned long);
199 
200 	for (i = 0; i < boot_mem_map.nr_map; i++) {
201 		printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
202 		       field, (unsigned long long) boot_mem_map.map[i].size,
203 		       field, (unsigned long long) boot_mem_map.map[i].addr);
204 
205 		switch (boot_mem_map.map[i].type) {
206 		case BOOT_MEM_RAM:
207 			printk(KERN_CONT "(usable)\n");
208 			break;
209 		case BOOT_MEM_INIT_RAM:
210 			printk(KERN_CONT "(usable after init)\n");
211 			break;
212 		case BOOT_MEM_ROM_DATA:
213 			printk(KERN_CONT "(ROM data)\n");
214 			break;
215 		case BOOT_MEM_RESERVED:
216 			printk(KERN_CONT "(reserved)\n");
217 			break;
218 		case BOOT_MEM_NOMAP:
219 			printk(KERN_CONT "(nomap)\n");
220 			break;
221 		default:
222 			printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
223 			break;
224 		}
225 	}
226 }
227 
228 /*
229  * Manage initrd
230  */
231 #ifdef CONFIG_BLK_DEV_INITRD
232 
233 static int __init rd_start_early(char *p)
234 {
235 	unsigned long start = memparse(p, &p);
236 
237 #ifdef CONFIG_64BIT
238 	/* Guess if the sign extension was forgotten by bootloader */
239 	if (start < XKPHYS)
240 		start = (int)start;
241 #endif
242 	initrd_start = start;
243 	initrd_end += start;
244 	return 0;
245 }
246 early_param("rd_start", rd_start_early);
247 
248 static int __init rd_size_early(char *p)
249 {
250 	initrd_end += memparse(p, &p);
251 	return 0;
252 }
253 early_param("rd_size", rd_size_early);
254 
255 /* it returns the next free pfn after initrd */
256 static unsigned long __init init_initrd(void)
257 {
258 	unsigned long end;
259 
260 	/*
261 	 * Board specific code or command line parser should have
262 	 * already set up initrd_start and initrd_end. In these cases
263 	 * perfom sanity checks and use them if all looks good.
264 	 */
265 	if (!initrd_start || initrd_end <= initrd_start)
266 		goto disable;
267 
268 	if (initrd_start & ~PAGE_MASK) {
269 		pr_err("initrd start must be page aligned\n");
270 		goto disable;
271 	}
272 	if (initrd_start < PAGE_OFFSET) {
273 		pr_err("initrd start < PAGE_OFFSET\n");
274 		goto disable;
275 	}
276 
277 	/*
278 	 * Sanitize initrd addresses. For example firmware
279 	 * can't guess if they need to pass them through
280 	 * 64-bits values if the kernel has been built in pure
281 	 * 32-bit. We need also to switch from KSEG0 to XKPHYS
282 	 * addresses now, so the code can now safely use __pa().
283 	 */
284 	end = __pa(initrd_end);
285 	initrd_end = (unsigned long)__va(end);
286 	initrd_start = (unsigned long)__va(__pa(initrd_start));
287 
288 	ROOT_DEV = Root_RAM0;
289 	return PFN_UP(end);
290 disable:
291 	initrd_start = 0;
292 	initrd_end = 0;
293 	return 0;
294 }
295 
296 /* In some conditions (e.g. big endian bootloader with a little endian
297    kernel), the initrd might appear byte swapped.  Try to detect this and
298    byte swap it if needed.  */
299 static void __init maybe_bswap_initrd(void)
300 {
301 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
302 	u64 buf;
303 
304 	/* Check for CPIO signature */
305 	if (!memcmp((void *)initrd_start, "070701", 6))
306 		return;
307 
308 	/* Check for compressed initrd */
309 	if (decompress_method((unsigned char *)initrd_start, 8, NULL))
310 		return;
311 
312 	/* Try again with a byte swapped header */
313 	buf = swab64p((u64 *)initrd_start);
314 	if (!memcmp(&buf, "070701", 6) ||
315 	    decompress_method((unsigned char *)(&buf), 8, NULL)) {
316 		unsigned long i;
317 
318 		pr_info("Byteswapped initrd detected\n");
319 		for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
320 			swab64s((u64 *)i);
321 	}
322 #endif
323 }
324 
325 static void __init finalize_initrd(void)
326 {
327 	unsigned long size = initrd_end - initrd_start;
328 
329 	if (size == 0) {
330 		printk(KERN_INFO "Initrd not found or empty");
331 		goto disable;
332 	}
333 	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
334 		printk(KERN_ERR "Initrd extends beyond end of memory");
335 		goto disable;
336 	}
337 
338 	maybe_bswap_initrd();
339 
340 	memblock_reserve(__pa(initrd_start), size);
341 	initrd_below_start_ok = 1;
342 
343 	pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
344 		initrd_start, size);
345 	return;
346 disable:
347 	printk(KERN_CONT " - disabling initrd\n");
348 	initrd_start = 0;
349 	initrd_end = 0;
350 }
351 
352 #else  /* !CONFIG_BLK_DEV_INITRD */
353 
354 static unsigned long __init init_initrd(void)
355 {
356 	return 0;
357 }
358 
359 #define finalize_initrd()	do {} while (0)
360 
361 #endif
362 
363 /*
364  * Initialize the bootmem allocator. It also setup initrd related data
365  * if needed.
366  */
367 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
368 
369 static void __init bootmem_init(void)
370 {
371 	init_initrd();
372 	finalize_initrd();
373 }
374 
375 #else  /* !CONFIG_SGI_IP27 */
376 
377 static void __init bootmem_init(void)
378 {
379 	phys_addr_t ramstart = PHYS_ADDR_MAX;
380 	int i;
381 
382 	/*
383 	 * Sanity check any INITRD first. We don't take it into account
384 	 * for bootmem setup initially, rely on the end-of-kernel-code
385 	 * as our memory range starting point. Once bootmem is inited we
386 	 * will reserve the area used for the initrd.
387 	 */
388 	init_initrd();
389 
390 	/* Reserve memory occupied by kernel. */
391 	memblock_reserve(__pa_symbol(&_text),
392 			__pa_symbol(&_end) - __pa_symbol(&_text));
393 
394 	/*
395 	 * max_low_pfn is not a number of pages. The number of pages
396 	 * of the system is given by 'max_low_pfn - min_low_pfn'.
397 	 */
398 	min_low_pfn = ~0UL;
399 	max_low_pfn = 0;
400 
401 	/* Find the highest and lowest page frame numbers we have available. */
402 	for (i = 0; i < boot_mem_map.nr_map; i++) {
403 		unsigned long start, end;
404 
405 		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
406 			continue;
407 
408 		start = PFN_UP(boot_mem_map.map[i].addr);
409 		end = PFN_DOWN(boot_mem_map.map[i].addr
410 				+ boot_mem_map.map[i].size);
411 
412 		ramstart = min(ramstart, boot_mem_map.map[i].addr);
413 
414 #ifndef CONFIG_HIGHMEM
415 		/*
416 		 * Skip highmem here so we get an accurate max_low_pfn if low
417 		 * memory stops short of high memory.
418 		 * If the region overlaps HIGHMEM_START, end is clipped so
419 		 * max_pfn excludes the highmem portion.
420 		 */
421 		if (start >= PFN_DOWN(HIGHMEM_START))
422 			continue;
423 		if (end > PFN_DOWN(HIGHMEM_START))
424 			end = PFN_DOWN(HIGHMEM_START);
425 #endif
426 
427 		if (end > max_low_pfn)
428 			max_low_pfn = end;
429 		if (start < min_low_pfn)
430 			min_low_pfn = start;
431 	}
432 
433 	if (min_low_pfn >= max_low_pfn)
434 		panic("Incorrect memory mapping !!!");
435 
436 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
437 	ARCH_PFN_OFFSET = PFN_UP(ramstart);
438 #else
439 	/*
440 	 * Reserve any memory between the start of RAM and PHYS_OFFSET
441 	 */
442 	if (ramstart > PHYS_OFFSET) {
443 		add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
444 				  BOOT_MEM_RESERVED);
445 		memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
446 	}
447 
448 	if (min_low_pfn > ARCH_PFN_OFFSET) {
449 		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
450 			(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
451 			min_low_pfn - ARCH_PFN_OFFSET);
452 	} else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
453 		pr_info("%lu free pages won't be used\n",
454 			ARCH_PFN_OFFSET - min_low_pfn);
455 	}
456 	min_low_pfn = ARCH_PFN_OFFSET;
457 #endif
458 
459 	/*
460 	 * Determine low and high memory ranges
461 	 */
462 	max_pfn = max_low_pfn;
463 	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
464 #ifdef CONFIG_HIGHMEM
465 		highstart_pfn = PFN_DOWN(HIGHMEM_START);
466 		highend_pfn = max_low_pfn;
467 #endif
468 		max_low_pfn = PFN_DOWN(HIGHMEM_START);
469 	}
470 
471 	/* Install all valid RAM ranges to the memblock memory region */
472 	for (i = 0; i < boot_mem_map.nr_map; i++) {
473 		unsigned long start, end;
474 
475 		start = PFN_UP(boot_mem_map.map[i].addr);
476 		end = PFN_DOWN(boot_mem_map.map[i].addr
477 				+ boot_mem_map.map[i].size);
478 
479 		if (start < min_low_pfn)
480 			start = min_low_pfn;
481 #ifndef CONFIG_HIGHMEM
482 		/* Ignore highmem regions if highmem is unsupported */
483 		if (end > max_low_pfn)
484 			end = max_low_pfn;
485 #endif
486 		if (end <= start)
487 			continue;
488 
489 		memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
490 
491 		/* Reserve any memory except the ordinary RAM ranges. */
492 		switch (boot_mem_map.map[i].type) {
493 		case BOOT_MEM_RAM:
494 			break;
495 		case BOOT_MEM_NOMAP: /* Discard the range from the system. */
496 			memblock_remove(PFN_PHYS(start), PFN_PHYS(end - start));
497 			continue;
498 		default: /* Reserve the rest of the memory types at boot time */
499 			memblock_reserve(PFN_PHYS(start), PFN_PHYS(end - start));
500 			break;
501 		}
502 
503 		/*
504 		 * In any case the added to the memblock memory regions
505 		 * (highmem/lowmem, available/reserved, etc) are considered
506 		 * as present, so inform sparsemem about them.
507 		 */
508 		memory_present(0, start, end);
509 	}
510 
511 	/*
512 	 * Reserve initrd memory if needed.
513 	 */
514 	finalize_initrd();
515 }
516 
517 #endif	/* CONFIG_SGI_IP27 */
518 
519 static int usermem __initdata;
520 
521 static int __init early_parse_mem(char *p)
522 {
523 	phys_addr_t start, size;
524 
525 	/*
526 	 * If a user specifies memory size, we
527 	 * blow away any automatically generated
528 	 * size.
529 	 */
530 	if (usermem == 0) {
531 		boot_mem_map.nr_map = 0;
532 		usermem = 1;
533 	}
534 	start = 0;
535 	size = memparse(p, &p);
536 	if (*p == '@')
537 		start = memparse(p + 1, &p);
538 
539 	add_memory_region(start, size, BOOT_MEM_RAM);
540 
541 	return 0;
542 }
543 early_param("mem", early_parse_mem);
544 
545 static int __init early_parse_memmap(char *p)
546 {
547 	char *oldp;
548 	u64 start_at, mem_size;
549 
550 	if (!p)
551 		return -EINVAL;
552 
553 	if (!strncmp(p, "exactmap", 8)) {
554 		pr_err("\"memmap=exactmap\" invalid on MIPS\n");
555 		return 0;
556 	}
557 
558 	oldp = p;
559 	mem_size = memparse(p, &p);
560 	if (p == oldp)
561 		return -EINVAL;
562 
563 	if (*p == '@') {
564 		start_at = memparse(p+1, &p);
565 		add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
566 	} else if (*p == '#') {
567 		pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
568 		return -EINVAL;
569 	} else if (*p == '$') {
570 		start_at = memparse(p+1, &p);
571 		add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
572 	} else {
573 		pr_err("\"memmap\" invalid format!\n");
574 		return -EINVAL;
575 	}
576 
577 	if (*p == '\0') {
578 		usermem = 1;
579 		return 0;
580 	} else
581 		return -EINVAL;
582 }
583 early_param("memmap", early_parse_memmap);
584 
585 #ifdef CONFIG_PROC_VMCORE
586 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
587 static int __init early_parse_elfcorehdr(char *p)
588 {
589 	int i;
590 
591 	setup_elfcorehdr = memparse(p, &p);
592 
593 	for (i = 0; i < boot_mem_map.nr_map; i++) {
594 		unsigned long start = boot_mem_map.map[i].addr;
595 		unsigned long end = (boot_mem_map.map[i].addr +
596 				     boot_mem_map.map[i].size);
597 		if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
598 			/*
599 			 * Reserve from the elf core header to the end of
600 			 * the memory segment, that should all be kdump
601 			 * reserved memory.
602 			 */
603 			setup_elfcorehdr_size = end - setup_elfcorehdr;
604 			break;
605 		}
606 	}
607 	/*
608 	 * If we don't find it in the memory map, then we shouldn't
609 	 * have to worry about it, as the new kernel won't use it.
610 	 */
611 	return 0;
612 }
613 early_param("elfcorehdr", early_parse_elfcorehdr);
614 #endif
615 
616 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
617 {
618 	phys_addr_t size;
619 	int i;
620 
621 	size = end - mem;
622 	if (!size)
623 		return;
624 
625 	/* Make sure it is in the boot_mem_map */
626 	for (i = 0; i < boot_mem_map.nr_map; i++) {
627 		if (mem >= boot_mem_map.map[i].addr &&
628 		    mem < (boot_mem_map.map[i].addr +
629 			   boot_mem_map.map[i].size))
630 			return;
631 	}
632 	add_memory_region(mem, size, type);
633 }
634 
635 #ifdef CONFIG_KEXEC
636 static inline unsigned long long get_total_mem(void)
637 {
638 	unsigned long long total;
639 
640 	total = max_pfn - min_low_pfn;
641 	return total << PAGE_SHIFT;
642 }
643 
644 static void __init mips_parse_crashkernel(void)
645 {
646 	unsigned long long total_mem;
647 	unsigned long long crash_size, crash_base;
648 	int ret;
649 
650 	total_mem = get_total_mem();
651 	ret = parse_crashkernel(boot_command_line, total_mem,
652 				&crash_size, &crash_base);
653 	if (ret != 0 || crash_size <= 0)
654 		return;
655 
656 	if (!memory_region_available(crash_base, crash_size)) {
657 		pr_warn("Invalid memory region reserved for crash kernel\n");
658 		return;
659 	}
660 
661 	crashk_res.start = crash_base;
662 	crashk_res.end	 = crash_base + crash_size - 1;
663 }
664 
665 static void __init request_crashkernel(struct resource *res)
666 {
667 	int ret;
668 
669 	if (crashk_res.start == crashk_res.end)
670 		return;
671 
672 	ret = request_resource(res, &crashk_res);
673 	if (!ret)
674 		pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
675 			(unsigned long)((crashk_res.end -
676 					 crashk_res.start + 1) >> 20),
677 			(unsigned long)(crashk_res.start  >> 20));
678 }
679 #else /* !defined(CONFIG_KEXEC)		*/
680 static void __init mips_parse_crashkernel(void)
681 {
682 }
683 
684 static void __init request_crashkernel(struct resource *res)
685 {
686 }
687 #endif /* !defined(CONFIG_KEXEC)  */
688 
689 #define USE_PROM_CMDLINE	IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
690 #define USE_DTB_CMDLINE		IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
691 #define EXTEND_WITH_PROM	IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
692 #define BUILTIN_EXTEND_WITH_PROM	\
693 	IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
694 
695 /*
696  * arch_mem_init - initialize memory management subsystem
697  *
698  *  o plat_mem_setup() detects the memory configuration and will record detected
699  *    memory areas using add_memory_region.
700  *
701  * At this stage the memory configuration of the system is known to the
702  * kernel but generic memory management system is still entirely uninitialized.
703  *
704  *  o bootmem_init()
705  *  o sparse_init()
706  *  o paging_init()
707  *  o dma_contiguous_reserve()
708  *
709  * At this stage the bootmem allocator is ready to use.
710  *
711  * NOTE: historically plat_mem_setup did the entire platform initialization.
712  *	 This was rather impractical because it meant plat_mem_setup had to
713  * get away without any kind of memory allocator.  To keep old code from
714  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
715  * initialization hook for anything else was introduced.
716  */
717 static void __init arch_mem_init(char **cmdline_p)
718 {
719 	extern void plat_mem_setup(void);
720 
721 	/*
722 	 * Initialize boot_command_line to an innocuous but non-empty string in
723 	 * order to prevent early_init_dt_scan_chosen() from copying
724 	 * CONFIG_CMDLINE into it without our knowledge. We handle
725 	 * CONFIG_CMDLINE ourselves below & don't want to duplicate its
726 	 * content because repeating arguments can be problematic.
727 	 */
728 	strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
729 
730 	/* call board setup routine */
731 	plat_mem_setup();
732 	memblock_set_bottom_up(true);
733 
734 	/*
735 	 * Make sure all kernel memory is in the maps.  The "UP" and
736 	 * "DOWN" are opposite for initdata since if it crosses over
737 	 * into another memory section you don't want that to be
738 	 * freed when the initdata is freed.
739 	 */
740 	arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
741 			 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
742 			 BOOT_MEM_RAM);
743 	arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
744 			 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
745 			 BOOT_MEM_INIT_RAM);
746 	arch_mem_addpart(PFN_DOWN(__pa_symbol(&__bss_start)) << PAGE_SHIFT,
747 			 PFN_UP(__pa_symbol(&__bss_stop)) << PAGE_SHIFT,
748 			 BOOT_MEM_RAM);
749 
750 	pr_info("Determined physical RAM map:\n");
751 	print_memory_map();
752 
753 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
754 	strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
755 #else
756 	if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
757 	    (USE_DTB_CMDLINE && !boot_command_line[0]))
758 		strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
759 
760 	if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
761 		if (boot_command_line[0])
762 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
763 		strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
764 	}
765 
766 #if defined(CONFIG_CMDLINE_BOOL)
767 	if (builtin_cmdline[0]) {
768 		if (boot_command_line[0])
769 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
770 		strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
771 	}
772 
773 	if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
774 		if (boot_command_line[0])
775 			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
776 		strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
777 	}
778 #endif
779 #endif
780 	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
781 
782 	*cmdline_p = command_line;
783 
784 	parse_early_param();
785 
786 	if (usermem) {
787 		pr_info("User-defined physical RAM map:\n");
788 		print_memory_map();
789 	}
790 
791 	early_init_fdt_reserve_self();
792 	early_init_fdt_scan_reserved_mem();
793 
794 	bootmem_init();
795 
796 	/*
797 	 * Prevent memblock from allocating high memory.
798 	 * This cannot be done before max_low_pfn is detected, so up
799 	 * to this point is possible to only reserve physical memory
800 	 * with memblock_reserve; memblock_alloc* can be used
801 	 * only after this point
802 	 */
803 	memblock_set_current_limit(PFN_PHYS(max_low_pfn));
804 
805 #ifdef CONFIG_PROC_VMCORE
806 	if (setup_elfcorehdr && setup_elfcorehdr_size) {
807 		printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
808 		       setup_elfcorehdr, setup_elfcorehdr_size);
809 		memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
810 	}
811 #endif
812 
813 	mips_parse_crashkernel();
814 #ifdef CONFIG_KEXEC
815 	if (crashk_res.start != crashk_res.end)
816 		memblock_reserve(crashk_res.start,
817 				 crashk_res.end - crashk_res.start + 1);
818 #endif
819 	device_tree_init();
820 	sparse_init();
821 	plat_swiotlb_setup();
822 
823 	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
824 
825 	/* Reserve for hibernation. */
826 	memblock_reserve(__pa_symbol(&__nosave_begin),
827 		__pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
828 
829 	fdt_init_reserved_mem();
830 
831 	memblock_dump_all();
832 
833 	early_memtest(PFN_PHYS(min_low_pfn), PFN_PHYS(max_low_pfn));
834 }
835 
836 static void __init resource_init(void)
837 {
838 	int i;
839 
840 	if (UNCAC_BASE != IO_BASE)
841 		return;
842 
843 	code_resource.start = __pa_symbol(&_text);
844 	code_resource.end = __pa_symbol(&_etext) - 1;
845 	data_resource.start = __pa_symbol(&_etext);
846 	data_resource.end = __pa_symbol(&_edata) - 1;
847 	bss_resource.start = __pa_symbol(&__bss_start);
848 	bss_resource.end = __pa_symbol(&__bss_stop) - 1;
849 
850 	for (i = 0; i < boot_mem_map.nr_map; i++) {
851 		struct resource *res;
852 		unsigned long start, end;
853 
854 		start = boot_mem_map.map[i].addr;
855 		end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
856 		if (start >= HIGHMEM_START)
857 			continue;
858 		if (end >= HIGHMEM_START)
859 			end = HIGHMEM_START - 1;
860 
861 		res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
862 		if (!res)
863 			panic("%s: Failed to allocate %zu bytes\n", __func__,
864 			      sizeof(struct resource));
865 
866 		res->start = start;
867 		res->end = end;
868 		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
869 
870 		switch (boot_mem_map.map[i].type) {
871 		case BOOT_MEM_RAM:
872 		case BOOT_MEM_INIT_RAM:
873 		case BOOT_MEM_ROM_DATA:
874 			res->name = "System RAM";
875 			res->flags |= IORESOURCE_SYSRAM;
876 			break;
877 		case BOOT_MEM_RESERVED:
878 		case BOOT_MEM_NOMAP:
879 		default:
880 			res->name = "reserved";
881 		}
882 
883 		request_resource(&iomem_resource, res);
884 
885 		/*
886 		 *  We don't know which RAM region contains kernel data,
887 		 *  so we try it repeatedly and let the resource manager
888 		 *  test it.
889 		 */
890 		request_resource(res, &code_resource);
891 		request_resource(res, &data_resource);
892 		request_resource(res, &bss_resource);
893 		request_crashkernel(res);
894 	}
895 }
896 
897 #ifdef CONFIG_SMP
898 static void __init prefill_possible_map(void)
899 {
900 	int i, possible = num_possible_cpus();
901 
902 	if (possible > nr_cpu_ids)
903 		possible = nr_cpu_ids;
904 
905 	for (i = 0; i < possible; i++)
906 		set_cpu_possible(i, true);
907 	for (; i < NR_CPUS; i++)
908 		set_cpu_possible(i, false);
909 
910 	nr_cpu_ids = possible;
911 }
912 #else
913 static inline void prefill_possible_map(void) {}
914 #endif
915 
916 void __init setup_arch(char **cmdline_p)
917 {
918 	cpu_probe();
919 	mips_cm_probe();
920 	prom_init();
921 
922 	setup_early_fdc_console();
923 #ifdef CONFIG_EARLY_PRINTK
924 	setup_early_printk();
925 #endif
926 	cpu_report();
927 	check_bugs_early();
928 
929 #if defined(CONFIG_VT)
930 #if defined(CONFIG_VGA_CONSOLE)
931 	conswitchp = &vga_con;
932 #elif defined(CONFIG_DUMMY_CONSOLE)
933 	conswitchp = &dummy_con;
934 #endif
935 #endif
936 
937 	arch_mem_init(cmdline_p);
938 
939 	resource_init();
940 	plat_smp_setup();
941 	prefill_possible_map();
942 
943 	cpu_cache_init();
944 	paging_init();
945 }
946 
947 unsigned long kernelsp[NR_CPUS];
948 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
949 
950 #ifdef CONFIG_USE_OF
951 unsigned long fw_passed_dtb;
952 #endif
953 
954 #ifdef CONFIG_DEBUG_FS
955 struct dentry *mips_debugfs_dir;
956 static int __init debugfs_mips(void)
957 {
958 	mips_debugfs_dir = debugfs_create_dir("mips", NULL);
959 	return 0;
960 }
961 arch_initcall(debugfs_mips);
962 #endif
963 
964 #ifdef CONFIG_DMA_MAYBE_COHERENT
965 /* User defined DMA coherency from command line. */
966 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
967 EXPORT_SYMBOL_GPL(coherentio);
968 int hw_coherentio = 0;	/* Actual hardware supported DMA coherency setting. */
969 
970 static int __init setcoherentio(char *str)
971 {
972 	coherentio = IO_COHERENCE_ENABLED;
973 	pr_info("Hardware DMA cache coherency (command line)\n");
974 	return 0;
975 }
976 early_param("coherentio", setcoherentio);
977 
978 static int __init setnocoherentio(char *str)
979 {
980 	coherentio = IO_COHERENCE_DISABLED;
981 	pr_info("Software DMA cache coherency (command line)\n");
982 	return 0;
983 }
984 early_param("nocoherentio", setnocoherentio);
985 #endif
986