Commit | Line | Data |
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1da177e4 LT |
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. | |
70342287 | 11 | * Copyright (C) 2000, 2001, 2002, 2007 Maciej W. Rozycki |
1da177e4 | 12 | */ |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/ioport.h> | |
73bc256d | 15 | #include <linux/export.h> |
894673ee | 16 | #include <linux/screen_info.h> |
9d15ffc8 | 17 | #include <linux/memblock.h> |
1da177e4 | 18 | #include <linux/initrd.h> |
1da177e4 LT |
19 | #include <linux/root_dev.h> |
20 | #include <linux/highmem.h> | |
21 | #include <linux/console.h> | |
22a9835c | 22 | #include <linux/pfn.h> |
6312e0ee | 23 | #include <linux/debugfs.h> |
7aa1c8f4 | 24 | #include <linux/kexec.h> |
4d9f77d2 | 25 | #include <linux/sizes.h> |
f4649382 ZLK |
26 | #include <linux/device.h> |
27 | #include <linux/dma-contiguous.h> | |
8f4703aa | 28 | #include <linux/decompress/generic.h> |
73346081 | 29 | #include <linux/of_fdt.h> |
3751cbda | 30 | #include <linux/of_reserved_mem.h> |
1da177e4 LT |
31 | |
32 | #include <asm/addrspace.h> | |
33 | #include <asm/bootinfo.h> | |
20d60d99 | 34 | #include <asm/bugs.h> |
ec74e361 | 35 | #include <asm/cache.h> |
e934945d | 36 | #include <asm/cdmm.h> |
1da177e4 | 37 | #include <asm/cpu.h> |
75dcfc1d | 38 | #include <asm/debug.h> |
aa4db775 | 39 | #include <asm/dma-coherence.h> |
1da177e4 LT |
40 | #include <asm/sections.h> |
41 | #include <asm/setup.h> | |
87353d8a | 42 | #include <asm/smp-ops.h> |
f2ffa5ab | 43 | #include <asm/prom.h> |
1da177e4 | 44 | |
87db537d AK |
45 | #ifdef CONFIG_MIPS_ELF_APPENDED_DTB |
46 | const char __section(.appended_dtb) __appended_dtb[0x100000]; | |
47 | #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ | |
48 | ||
ec74e361 | 49 | struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; |
1da177e4 LT |
50 | |
51 | EXPORT_SYMBOL(cpu_data); | |
52 | ||
53 | #ifdef CONFIG_VT | |
54 | struct screen_info screen_info; | |
55 | #endif | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Setup information | |
59 | * | |
60 | * These are initialized so they are in the .data section | |
61 | */ | |
ec74e361 | 62 | unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; |
1da177e4 LT |
63 | |
64 | EXPORT_SYMBOL(mips_machtype); | |
1da177e4 | 65 | |
6acc7d48 DV |
66 | static char __initdata command_line[COMMAND_LINE_SIZE]; |
67 | char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; | |
68 | ||
69 | #ifdef CONFIG_CMDLINE_BOOL | |
9dd422f6 | 70 | static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; |
b7340422 PB |
71 | #else |
72 | static const char builtin_cmdline[] __initconst = ""; | |
6acc7d48 | 73 | #endif |
1da177e4 LT |
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 | */ | |
12051b31 | 79 | unsigned long mips_io_port_base = -1; |
1da177e4 LT |
80 | EXPORT_SYMBOL(mips_io_port_base); |
81 | ||
1da177e4 LT |
82 | static struct resource code_resource = { .name = "Kernel code", }; |
83 | static struct resource data_resource = { .name = "Kernel data", }; | |
e0c5f36b | 84 | static struct resource bss_resource = { .name = "Kernel bss", }; |
1da177e4 | 85 | |
4d9f77d2 JC |
86 | static void *detect_magic __initdata = detect_memory_region; |
87 | ||
6c359eb1 PB |
88 | #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET |
89 | unsigned long ARCH_PFN_OFFSET; | |
90 | EXPORT_SYMBOL(ARCH_PFN_OFFSET); | |
91 | #endif | |
92 | ||
15d45cce | 93 | void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) |
1da177e4 | 94 | { |
a94e4f24 JY |
95 | /* |
96 | * Note: This function only exists for historical reason, | |
97 | * new code should use memblock_add or memblock_add_node instead. | |
98 | */ | |
1da177e4 | 99 | |
58cae9b0 JH |
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 | */ | |
d7dc899a | 104 | if (start + size - 1 == PHYS_ADDR_MAX) |
58cae9b0 JH |
105 | --size; |
106 | ||
b6f1f0de FBH |
107 | /* Sanity check */ |
108 | if (start + size < start) { | |
7178d2cd | 109 | pr_warn("Trying to add an invalid memory region, skipped\n"); |
b6f1f0de FBH |
110 | return; |
111 | } | |
112 | ||
bd848d1b TB |
113 | if (start < PHYS_OFFSET) |
114 | return; | |
115 | ||
a94e4f24 JY |
116 | memblock_add(start, size); |
117 | /* Reserve any memory except the ordinary RAM ranges. */ | |
118 | switch (type) { | |
119 | case BOOT_MEM_RAM: | |
120 | break; | |
0ec7ec75 | 121 | |
a94e4f24 JY |
122 | case BOOT_MEM_NOMAP: /* Discard the range from the system. */ |
123 | memblock_remove(start, size); | |
124 | break; | |
0ec7ec75 | 125 | |
a94e4f24 JY |
126 | default: /* Reserve the rest of the memory types at boot time */ |
127 | memblock_reserve(start, size); | |
128 | break; | |
1da177e4 | 129 | } |
1da177e4 LT |
130 | } |
131 | ||
15d45cce | 132 | void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) |
4d9f77d2 JC |
133 | { |
134 | void *dm = &detect_magic; | |
15d45cce | 135 | phys_addr_t size; |
4d9f77d2 JC |
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 | ||
d2043ca8 FBH |
151 | /* |
152 | * Manage initrd | |
153 | */ | |
154 | #ifdef CONFIG_BLK_DEV_INITRD | |
155 | ||
a09fc446 | 156 | static int __init rd_start_early(char *p) |
1da177e4 | 157 | { |
a09fc446 | 158 | unsigned long start = memparse(p, &p); |
1da177e4 | 159 | |
875d43e7 | 160 | #ifdef CONFIG_64BIT |
a7837b76 FBH |
161 | /* Guess if the sign extension was forgotten by bootloader */ |
162 | if (start < XKPHYS) | |
163 | start = (int)start; | |
1da177e4 | 164 | #endif |
a09fc446 FBH |
165 | initrd_start = start; |
166 | initrd_end += start; | |
a09fc446 FBH |
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); | |
1da177e4 LT |
174 | return 0; |
175 | } | |
a09fc446 | 176 | early_param("rd_size", rd_size_early); |
1da177e4 | 177 | |
a7837b76 | 178 | /* it returns the next free pfn after initrd */ |
d2043ca8 FBH |
179 | static unsigned long __init init_initrd(void) |
180 | { | |
a7837b76 | 181 | unsigned long end; |
d2043ca8 | 182 | |
d2043ca8 | 183 | /* |
a09fc446 FBH |
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. | |
d2043ca8 | 187 | */ |
32028f1f | 188 | if (!initrd_start || initrd_end <= initrd_start) |
a7837b76 | 189 | goto disable; |
a7837b76 | 190 | |
a7837b76 | 191 | if (initrd_start & ~PAGE_MASK) { |
a64ae7a2 | 192 | pr_err("initrd start must be page aligned\n"); |
a7837b76 | 193 | goto disable; |
d2043ca8 | 194 | } |
a7837b76 | 195 | if (initrd_start < PAGE_OFFSET) { |
a64ae7a2 | 196 | pr_err("initrd start < PAGE_OFFSET\n"); |
a7837b76 FBH |
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; | |
d2043ca8 FBH |
217 | } |
218 | ||
8f4703aa AJ |
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 | ||
d2043ca8 FBH |
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 | } | |
d4df6d4e | 256 | if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { |
a64ae7a2 | 257 | printk(KERN_ERR "Initrd extends beyond end of memory"); |
d2043ca8 FBH |
258 | goto disable; |
259 | } | |
260 | ||
8f4703aa AJ |
261 | maybe_bswap_initrd(); |
262 | ||
bcec54bf | 263 | memblock_reserve(__pa(initrd_start), size); |
d2043ca8 FBH |
264 | initrd_below_start_ok = 1; |
265 | ||
a64ae7a2 MC |
266 | pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", |
267 | initrd_start, size); | |
d2043ca8 FBH |
268 | return; |
269 | disable: | |
a64ae7a2 | 270 | printk(KERN_CONT " - disabling initrd\n"); |
d2043ca8 FBH |
271 | initrd_start = 0; |
272 | initrd_end = 0; | |
273 | } | |
274 | ||
275 | #else /* !CONFIG_BLK_DEV_INITRD */ | |
276 | ||
9ba126cf RB |
277 | static unsigned long __init init_initrd(void) |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
d2043ca8 FBH |
282 | #define finalize_initrd() do {} while (0) |
283 | ||
284 | #endif | |
285 | ||
b6f1f0de FBH |
286 | /* |
287 | * Initialize the bootmem allocator. It also setup initrd related data | |
288 | * if needed. | |
289 | */ | |
268a2d60 | 290 | #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) |
d2043ca8 | 291 | |
b6f1f0de | 292 | static void __init bootmem_init(void) |
1da177e4 | 293 | { |
d2043ca8 FBH |
294 | init_initrd(); |
295 | finalize_initrd(); | |
296 | } | |
297 | ||
298 | #else /* !CONFIG_SGI_IP27 */ | |
299 | ||
300 | static void __init bootmem_init(void) | |
301 | { | |
a94e4f24 JY |
302 | struct memblock_region *mem; |
303 | phys_addr_t ramstart, ramend; | |
304 | ||
305 | ramstart = memblock_start_of_DRAM(); | |
306 | ramend = memblock_end_of_DRAM(); | |
1da177e4 LT |
307 | |
308 | /* | |
f9a7febd GU |
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. | |
1da177e4 | 313 | */ |
f9a7febd | 314 | init_initrd(); |
1da177e4 | 315 | |
b93ddc4f SS |
316 | /* Reserve memory occupied by kernel. */ |
317 | memblock_reserve(__pa_symbol(&_text), | |
318 | __pa_symbol(&_end) - __pa_symbol(&_text)); | |
bcec54bf | 319 | |
a94e4f24 JY |
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 | |
db84dc61 | 325 | /* |
a94e4f24 | 326 | * Reserve any memory between the start of RAM and PHYS_OFFSET |
db84dc61 | 327 | */ |
a94e4f24 | 328 | if (ramstart > PHYS_OFFSET) |
66b416ee | 329 | memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); |
1da177e4 | 330 | |
a94e4f24 JY |
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 | |
1da177e4 | 337 | |
a94e4f24 JY |
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); | |
67a3ba25 | 343 | |
16a767ec JH |
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 | */ | |
a94e4f24 JY |
350 | if (memblock_is_nomap(mem)) |
351 | continue; | |
16a767ec JH |
352 | if (start >= PFN_DOWN(HIGHMEM_START)) |
353 | continue; | |
354 | if (end > PFN_DOWN(HIGHMEM_START)) | |
355 | end = PFN_DOWN(HIGHMEM_START); | |
db84dc61 FBH |
356 | if (end > max_low_pfn) |
357 | max_low_pfn = end; | |
1da177e4 LT |
358 | } |
359 | ||
6c359eb1 PB |
360 | if (min_low_pfn >= max_low_pfn) |
361 | panic("Incorrect memory mapping !!!"); | |
362 | ||
a94e4f24 | 363 | if (max_pfn > PFN_DOWN(HIGHMEM_START)) { |
b6f1f0de FBH |
364 | #ifdef CONFIG_HIGHMEM |
365 | highstart_pfn = PFN_DOWN(HIGHMEM_START); | |
a94e4f24 JY |
366 | highend_pfn = max_pfn; |
367 | #else | |
db84dc61 | 368 | max_low_pfn = PFN_DOWN(HIGHMEM_START); |
a94e4f24 | 369 | max_pfn = max_low_pfn; |
6ea3ba6f | 370 | #endif |
a94e4f24 | 371 | } |
43064c0c | 372 | |
1da177e4 | 373 | |
a94e4f24 JY |
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(); | |
1da177e4 | 380 | |
d2043ca8 FBH |
381 | /* |
382 | * Reserve initrd memory if needed. | |
383 | */ | |
384 | finalize_initrd(); | |
1da177e4 LT |
385 | } |
386 | ||
d2043ca8 FBH |
387 | #endif /* CONFIG_SGI_IP27 */ |
388 | ||
982f6ffe | 389 | static int usermem __initdata; |
a09fc446 FBH |
390 | |
391 | static int __init early_parse_mem(char *p) | |
392 | { | |
ad8f723a | 393 | phys_addr_t start, size; |
a09fc446 FBH |
394 | |
395 | /* | |
396 | * If a user specifies memory size, we | |
397 | * blow away any automatically generated | |
398 | * size. | |
399 | */ | |
400 | if (usermem == 0) { | |
a09fc446 | 401 | usermem = 1; |
a94e4f24 JY |
402 | memblock_remove(memblock_start_of_DRAM(), |
403 | memblock_end_of_DRAM() - memblock_start_of_DRAM()); | |
70342287 | 404 | } |
a09fc446 FBH |
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); | |
73fbc1eb | 411 | |
a09fc446 FBH |
412 | return 0; |
413 | } | |
414 | early_param("mem", early_parse_mem); | |
2925aba4 | 415 | |
296a7624 MD |
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 | ||
4893fc88 CM |
456 | #ifdef CONFIG_PROC_VMCORE |
457 | unsigned long setup_elfcorehdr, setup_elfcorehdr_size; | |
458 | static int __init early_parse_elfcorehdr(char *p) | |
459 | { | |
a94e4f24 | 460 | struct memblock_region *mem; |
4893fc88 CM |
461 | |
462 | setup_elfcorehdr = memparse(p, &p); | |
463 | ||
a94e4f24 JY |
464 | for_each_memblock(memory, mem) { |
465 | unsigned long start = mem->base; | |
dbb9ced7 | 466 | unsigned long end = start + mem->size; |
4893fc88 CM |
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 | ||
c2882b7f | 486 | #ifdef CONFIG_KEXEC |
c2882b7f PM |
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 | ||
a94e4f24 | 493 | total_mem = memblock_phys_mem_size(); |
c2882b7f PM |
494 | ret = parse_crashkernel(boot_command_line, total_mem, |
495 | &crash_size, &crash_base); | |
496 | if (ret != 0 || crash_size <= 0) | |
497 | return; | |
498 | ||
a94e4f24 | 499 | if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) { |
a8f108d7 MN |
500 | pr_warn("Invalid memory region reserved for crash kernel\n"); |
501 | return; | |
502 | } | |
503 | ||
c2882b7f PM |
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 | ||
269aa43a MN |
512 | if (crashk_res.start == crashk_res.end) |
513 | return; | |
514 | ||
c2882b7f PM |
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 | ||
a94e4f24 JY |
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 | ||
7784cac6 PB |
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 | ||
97272776 PB |
554 | #ifdef CONFIG_OF_EARLY_FLATTREE |
555 | ||
7784cac6 PB |
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 | ||
97272776 PB |
576 | #endif /* CONFIG_OF_EARLY_FLATTREE */ |
577 | ||
7784cac6 PB |
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 | ||
97272776 | 604 | #ifdef CONFIG_OF_EARLY_FLATTREE |
7784cac6 PB |
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 | of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); | |
97272776 | 611 | #endif |
7784cac6 PB |
612 | |
613 | /* | |
614 | * If we didn't get any arguments from DT (regardless of whether that's | |
615 | * because we weren't configured to look for them, or because we looked | |
616 | * & found none) then we'll take arguments from the bootloader. | |
617 | * plat_mem_setup() should have filled arcs_cmdline with arguments from | |
618 | * the bootloader. | |
619 | */ | |
620 | if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) | |
621 | bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); | |
622 | ||
623 | /* | |
624 | * If the user specified a built-in command line & we didn't already | |
625 | * prepend it, we append it to boot_command_line here. | |
626 | */ | |
627 | if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && | |
628 | !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) | |
629 | bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); | |
630 | } | |
2024972e | 631 | |
52c985ac PB |
632 | /* |
633 | * arch_mem_init - initialize memory management subsystem | |
634 | * | |
635 | * o plat_mem_setup() detects the memory configuration and will record detected | |
636 | * memory areas using add_memory_region. | |
637 | * | |
638 | * At this stage the memory configuration of the system is known to the | |
639 | * kernel but generic memory management system is still entirely uninitialized. | |
640 | * | |
641 | * o bootmem_init() | |
642 | * o sparse_init() | |
643 | * o paging_init() | |
644 | * o dma_contiguous_reserve() | |
645 | * | |
646 | * At this stage the bootmem allocator is ready to use. | |
647 | * | |
648 | * NOTE: historically plat_mem_setup did the entire platform initialization. | |
649 | * This was rather impractical because it meant plat_mem_setup had to | |
650 | * get away without any kind of memory allocator. To keep old code from | |
651 | * breaking plat_setup was just renamed to plat_mem_setup and a second platform | |
652 | * initialization hook for anything else was introduced. | |
653 | */ | |
d3ff9338 CM |
654 | static void __init arch_mem_init(char **cmdline_p) |
655 | { | |
a09fc446 FBH |
656 | extern void plat_mem_setup(void); |
657 | ||
951d223c PB |
658 | /* call board setup routine */ |
659 | plat_mem_setup(); | |
25517ed4 | 660 | memblock_set_bottom_up(true); |
951d223c | 661 | |
7784cac6 | 662 | bootcmdline_init(cmdline_p); |
6acc7d48 | 663 | strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); |
2925aba4 RB |
664 | *cmdline_p = command_line; |
665 | ||
a09fc446 FBH |
666 | parse_early_param(); |
667 | ||
a94e4f24 JY |
668 | if (usermem) |
669 | pr_info("User-defined physical RAM map overwrite\n"); | |
670 | ||
671 | check_kernel_sections_mem(); | |
a09fc446 | 672 | |
73346081 MN |
673 | early_init_fdt_reserve_self(); |
674 | early_init_fdt_scan_reserved_mem(); | |
675 | ||
a94e4f24 JY |
676 | #ifndef CONFIG_NUMA |
677 | memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); | |
678 | #endif | |
2925aba4 | 679 | bootmem_init(); |
bcec54bf MR |
680 | |
681 | /* | |
682 | * Prevent memblock from allocating high memory. | |
683 | * This cannot be done before max_low_pfn is detected, so up | |
684 | * to this point is possible to only reserve physical memory | |
eb31d559 | 685 | * with memblock_reserve; memblock_alloc* can be used |
bcec54bf MR |
686 | * only after this point |
687 | */ | |
688 | memblock_set_current_limit(PFN_PHYS(max_low_pfn)); | |
689 | ||
4893fc88 CM |
690 | #ifdef CONFIG_PROC_VMCORE |
691 | if (setup_elfcorehdr && setup_elfcorehdr_size) { | |
692 | printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", | |
693 | setup_elfcorehdr, setup_elfcorehdr_size); | |
bcec54bf | 694 | memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); |
4893fc88 CM |
695 | } |
696 | #endif | |
c2882b7f PM |
697 | |
698 | mips_parse_crashkernel(); | |
7aa1c8f4 RB |
699 | #ifdef CONFIG_KEXEC |
700 | if (crashk_res.start != crashk_res.end) | |
bcec54bf MR |
701 | memblock_reserve(crashk_res.start, |
702 | crashk_res.end - crashk_res.start + 1); | |
7aa1c8f4 | 703 | #endif |
f2ffa5ab | 704 | device_tree_init(); |
2925aba4 | 705 | sparse_init(); |
ee71b7d2 | 706 | plat_swiotlb_setup(); |
f4649382 ZLK |
707 | |
708 | dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); | |
a95d0692 | 709 | |
4e50a35d SS |
710 | /* Reserve for hibernation. */ |
711 | memblock_reserve(__pa_symbol(&__nosave_begin), | |
712 | __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); | |
30c8f4e4 | 713 | |
3751cbda SS |
714 | fdt_init_reserved_mem(); |
715 | ||
30c8f4e4 | 716 | memblock_dump_all(); |
2f5bd036 | 717 | |
a94e4f24 | 718 | early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); |
2925aba4 RB |
719 | } |
720 | ||
8df32c63 | 721 | static void __init resource_init(void) |
1da177e4 | 722 | { |
a94e4f24 | 723 | struct memblock_region *region; |
1da177e4 | 724 | |
6adb5fe7 RB |
725 | if (UNCAC_BASE != IO_BASE) |
726 | return; | |
727 | ||
f5bffe3a FBH |
728 | code_resource.start = __pa_symbol(&_text); |
729 | code_resource.end = __pa_symbol(&_etext) - 1; | |
730 | data_resource.start = __pa_symbol(&_etext); | |
731 | data_resource.end = __pa_symbol(&_edata) - 1; | |
e0c5f36b DD |
732 | bss_resource.start = __pa_symbol(&__bss_start); |
733 | bss_resource.end = __pa_symbol(&__bss_stop) - 1; | |
1da177e4 | 734 | |
a94e4f24 JY |
735 | for_each_memblock(memory, region) { |
736 | phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region)); | |
737 | phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1; | |
1da177e4 | 738 | struct resource *res; |
1da177e4 | 739 | |
7e1c4e27 | 740 | res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); |
8a7f97b9 MR |
741 | if (!res) |
742 | panic("%s: Failed to allocate %zu bytes\n", __func__, | |
743 | sizeof(struct resource)); | |
35d98e93 TK |
744 | |
745 | res->start = start; | |
746 | res->end = end; | |
a94e4f24 JY |
747 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
748 | res->name = "System RAM"; | |
1da177e4 | 749 | |
1da177e4 LT |
750 | request_resource(&iomem_resource, res); |
751 | ||
752 | /* | |
753 | * We don't know which RAM region contains kernel data, | |
754 | * so we try it repeatedly and let the resource manager | |
755 | * test it. | |
756 | */ | |
757 | request_resource(res, &code_resource); | |
758 | request_resource(res, &data_resource); | |
e0c5f36b | 759 | request_resource(res, &bss_resource); |
7aa1c8f4 | 760 | request_crashkernel(res); |
1da177e4 LT |
761 | } |
762 | } | |
763 | ||
0f3f506b HC |
764 | #ifdef CONFIG_SMP |
765 | static void __init prefill_possible_map(void) | |
766 | { | |
767 | int i, possible = num_possible_cpus(); | |
768 | ||
769 | if (possible > nr_cpu_ids) | |
770 | possible = nr_cpu_ids; | |
771 | ||
772 | for (i = 0; i < possible; i++) | |
773 | set_cpu_possible(i, true); | |
774 | for (; i < NR_CPUS; i++) | |
775 | set_cpu_possible(i, false); | |
776 | ||
777 | nr_cpu_ids = possible; | |
778 | } | |
779 | #else | |
780 | static inline void prefill_possible_map(void) {} | |
781 | #endif | |
782 | ||
1da177e4 LT |
783 | void __init setup_arch(char **cmdline_p) |
784 | { | |
785 | cpu_probe(); | |
3af5a67c | 786 | mips_cm_probe(); |
1da177e4 | 787 | prom_init(); |
36a88530 | 788 | |
e934945d | 789 | setup_early_fdc_console(); |
36a88530 | 790 | #ifdef CONFIG_EARLY_PRINTK |
07cdb784 | 791 | setup_early_printk(); |
36a88530 | 792 | #endif |
1da177e4 | 793 | cpu_report(); |
20d60d99 | 794 | check_bugs_early(); |
1da177e4 LT |
795 | |
796 | #if defined(CONFIG_VT) | |
797 | #if defined(CONFIG_VGA_CONSOLE) | |
e0daad44 | 798 | conswitchp = &vga_con; |
1da177e4 | 799 | #elif defined(CONFIG_DUMMY_CONSOLE) |
e0daad44 | 800 | conswitchp = &dummy_con; |
1da177e4 LT |
801 | #endif |
802 | #endif | |
803 | ||
2925aba4 | 804 | arch_mem_init(cmdline_p); |
1da177e4 | 805 | |
1da177e4 | 806 | resource_init(); |
9b6695a8 | 807 | plat_smp_setup(); |
0f3f506b | 808 | prefill_possible_map(); |
6650df3c DD |
809 | |
810 | cpu_cache_init(); | |
058effe7 | 811 | paging_init(); |
1da177e4 LT |
812 | } |
813 | ||
69a6c312 AN |
814 | unsigned long kernelsp[NR_CPUS]; |
815 | unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; | |
6312e0ee | 816 | |
15f37e15 JG |
817 | #ifdef CONFIG_USE_OF |
818 | unsigned long fw_passed_dtb; | |
819 | #endif | |
820 | ||
6312e0ee AN |
821 | #ifdef CONFIG_DEBUG_FS |
822 | struct dentry *mips_debugfs_dir; | |
823 | static int __init debugfs_mips(void) | |
824 | { | |
d8140426 | 825 | mips_debugfs_dir = debugfs_create_dir("mips", NULL); |
6312e0ee AN |
826 | return 0; |
827 | } | |
828 | arch_initcall(debugfs_mips); | |
829 | #endif | |
aa4db775 | 830 | |
5748e1b3 | 831 | #ifdef CONFIG_DMA_MAYBE_COHERENT |
aa4db775 CH |
832 | /* User defined DMA coherency from command line. */ |
833 | enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; | |
834 | EXPORT_SYMBOL_GPL(coherentio); | |
835 | int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ | |
836 | ||
837 | static int __init setcoherentio(char *str) | |
838 | { | |
839 | coherentio = IO_COHERENCE_ENABLED; | |
840 | pr_info("Hardware DMA cache coherency (command line)\n"); | |
841 | return 0; | |
842 | } | |
843 | early_param("coherentio", setcoherentio); | |
844 | ||
845 | static int __init setnocoherentio(char *str) | |
846 | { | |
847 | coherentio = IO_COHERENCE_DISABLED; | |
848 | pr_info("Software DMA cache coherency (command line)\n"); | |
849 | return 0; | |
850 | } | |
851 | early_param("nocoherentio", setnocoherentio); | |
852 | #endif |