Loading...
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-map-ops.h>
28#include <linux/decompress/generic.h>
29#include <linux/of_fdt.h>
30#include <linux/dmi.h>
31#include <linux/crash_dump.h>
32
33#include <asm/addrspace.h>
34#include <asm/bootinfo.h>
35#include <asm/bugs.h>
36#include <asm/cache.h>
37#include <asm/cdmm.h>
38#include <asm/cpu.h>
39#include <asm/debug.h>
40#include <asm/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
46char __section(".appended_dtb") __appended_dtb[0x100000];
47#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
48
49struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
50
51EXPORT_SYMBOL(cpu_data);
52
53#ifdef CONFIG_VT
54struct screen_info screen_info;
55#endif
56
57/*
58 * Setup information
59 *
60 * These are initialized so they are in the .data section
61 */
62unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
63
64EXPORT_SYMBOL(mips_machtype);
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
71#else
72static 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 */
79unsigned long mips_io_port_base = -1;
80EXPORT_SYMBOL(mips_io_port_base);
81
82static struct resource code_resource = { .name = "Kernel code", };
83static struct resource data_resource = { .name = "Kernel data", };
84static struct resource bss_resource = { .name = "Kernel bss", };
85
86unsigned long __kaslr_offset __ro_after_init;
87EXPORT_SYMBOL(__kaslr_offset);
88
89static void *detect_magic __initdata = detect_memory_region;
90
91#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
92unsigned long ARCH_PFN_OFFSET;
93EXPORT_SYMBOL(ARCH_PFN_OFFSET);
94#endif
95
96void __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
120static 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}
133early_param("rd_start", rd_start_early);
134
135static int __init rd_size_early(char *p)
136{
137 initrd_end += memparse(p, &p);
138 return 0;
139}
140early_param("rd_size", rd_size_early);
141
142/* it returns the next free pfn after initrd */
143static 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 if (initrd_start < PAGE_OFFSET) {
160 pr_err("initrd start < PAGE_OFFSET\n");
161 goto disable;
162 }
163
164 /*
165 * Sanitize initrd addresses. For example firmware
166 * can't guess if they need to pass them through
167 * 64-bits values if the kernel has been built in pure
168 * 32-bit. We need also to switch from KSEG0 to XKPHYS
169 * addresses now, so the code can now safely use __pa().
170 */
171 end = __pa(initrd_end);
172 initrd_end = (unsigned long)__va(end);
173 initrd_start = (unsigned long)__va(__pa(initrd_start));
174
175 ROOT_DEV = Root_RAM0;
176 return PFN_UP(end);
177disable:
178 initrd_start = 0;
179 initrd_end = 0;
180 return 0;
181}
182
183/* In some conditions (e.g. big endian bootloader with a little endian
184 kernel), the initrd might appear byte swapped. Try to detect this and
185 byte swap it if needed. */
186static void __init maybe_bswap_initrd(void)
187{
188#if defined(CONFIG_CPU_CAVIUM_OCTEON)
189 u64 buf;
190
191 /* Check for CPIO signature */
192 if (!memcmp((void *)initrd_start, "070701", 6))
193 return;
194
195 /* Check for compressed initrd */
196 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
197 return;
198
199 /* Try again with a byte swapped header */
200 buf = swab64p((u64 *)initrd_start);
201 if (!memcmp(&buf, "070701", 6) ||
202 decompress_method((unsigned char *)(&buf), 8, NULL)) {
203 unsigned long i;
204
205 pr_info("Byteswapped initrd detected\n");
206 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
207 swab64s((u64 *)i);
208 }
209#endif
210}
211
212static void __init finalize_initrd(void)
213{
214 unsigned long size = initrd_end - initrd_start;
215
216 if (size == 0) {
217 printk(KERN_INFO "Initrd not found or empty");
218 goto disable;
219 }
220 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
221 printk(KERN_ERR "Initrd extends beyond end of memory");
222 goto disable;
223 }
224
225 maybe_bswap_initrd();
226
227 memblock_reserve(__pa(initrd_start), size);
228 initrd_below_start_ok = 1;
229
230 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
231 initrd_start, size);
232 return;
233disable:
234 printk(KERN_CONT " - disabling initrd\n");
235 initrd_start = 0;
236 initrd_end = 0;
237}
238
239#else /* !CONFIG_BLK_DEV_INITRD */
240
241static unsigned long __init init_initrd(void)
242{
243 return 0;
244}
245
246#define finalize_initrd() do {} while (0)
247
248#endif
249
250/*
251 * Initialize the bootmem allocator. It also setup initrd related data
252 * if needed.
253 */
254#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
255
256static void __init bootmem_init(void)
257{
258 init_initrd();
259 finalize_initrd();
260}
261
262#else /* !CONFIG_SGI_IP27 */
263
264static void __init bootmem_init(void)
265{
266 phys_addr_t ramstart, ramend;
267 unsigned long start, end;
268 int i;
269
270 ramstart = memblock_start_of_DRAM();
271 ramend = memblock_end_of_DRAM();
272
273 /*
274 * Sanity check any INITRD first. We don't take it into account
275 * for bootmem setup initially, rely on the end-of-kernel-code
276 * as our memory range starting point. Once bootmem is inited we
277 * will reserve the area used for the initrd.
278 */
279 init_initrd();
280
281 /* Reserve memory occupied by kernel. */
282 memblock_reserve(__pa_symbol(&_text),
283 __pa_symbol(&_end) - __pa_symbol(&_text));
284
285 /* max_low_pfn is not a number of pages but the end pfn of low mem */
286
287#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
288 ARCH_PFN_OFFSET = PFN_UP(ramstart);
289#else
290 /*
291 * Reserve any memory between the start of RAM and PHYS_OFFSET
292 */
293 if (ramstart > PHYS_OFFSET)
294 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
295
296 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
297 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
298 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
299 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
300 }
301#endif
302
303 min_low_pfn = ARCH_PFN_OFFSET;
304 max_pfn = PFN_DOWN(ramend);
305 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
306 /*
307 * Skip highmem here so we get an accurate max_low_pfn if low
308 * memory stops short of high memory.
309 * If the region overlaps HIGHMEM_START, end is clipped so
310 * max_pfn excludes the highmem portion.
311 */
312 if (start >= PFN_DOWN(HIGHMEM_START))
313 continue;
314 if (end > PFN_DOWN(HIGHMEM_START))
315 end = PFN_DOWN(HIGHMEM_START);
316 if (end > max_low_pfn)
317 max_low_pfn = end;
318 }
319
320 if (min_low_pfn >= max_low_pfn)
321 panic("Incorrect memory mapping !!!");
322
323 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
324#ifdef CONFIG_HIGHMEM
325 highstart_pfn = PFN_DOWN(HIGHMEM_START);
326 highend_pfn = max_pfn;
327#else
328 max_low_pfn = PFN_DOWN(HIGHMEM_START);
329 max_pfn = max_low_pfn;
330#endif
331 }
332
333 /*
334 * Reserve initrd memory if needed.
335 */
336 finalize_initrd();
337}
338
339#endif /* CONFIG_SGI_IP27 */
340
341static int usermem __initdata;
342
343static int __init early_parse_mem(char *p)
344{
345 phys_addr_t start, size;
346
347 /*
348 * If a user specifies memory size, we
349 * blow away any automatically generated
350 * size.
351 */
352 if (usermem == 0) {
353 usermem = 1;
354 memblock_remove(memblock_start_of_DRAM(),
355 memblock_end_of_DRAM() - memblock_start_of_DRAM());
356 }
357 start = 0;
358 size = memparse(p, &p);
359 if (*p == '@')
360 start = memparse(p + 1, &p);
361
362 memblock_add(start, size);
363
364 return 0;
365}
366early_param("mem", early_parse_mem);
367
368static int __init early_parse_memmap(char *p)
369{
370 char *oldp;
371 u64 start_at, mem_size;
372
373 if (!p)
374 return -EINVAL;
375
376 if (!strncmp(p, "exactmap", 8)) {
377 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
378 return 0;
379 }
380
381 oldp = p;
382 mem_size = memparse(p, &p);
383 if (p == oldp)
384 return -EINVAL;
385
386 if (*p == '@') {
387 start_at = memparse(p+1, &p);
388 memblock_add(start_at, mem_size);
389 } else if (*p == '#') {
390 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
391 return -EINVAL;
392 } else if (*p == '$') {
393 start_at = memparse(p+1, &p);
394 memblock_add(start_at, mem_size);
395 memblock_reserve(start_at, mem_size);
396 } else {
397 pr_err("\"memmap\" invalid format!\n");
398 return -EINVAL;
399 }
400
401 if (*p == '\0') {
402 usermem = 1;
403 return 0;
404 } else
405 return -EINVAL;
406}
407early_param("memmap", early_parse_memmap);
408
409static void __init mips_reserve_vmcore(void)
410{
411#ifdef CONFIG_PROC_VMCORE
412 phys_addr_t start, end;
413 u64 i;
414
415 if (!elfcorehdr_size) {
416 for_each_mem_range(i, &start, &end) {
417 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
418 /*
419 * Reserve from the elf core header to the end of
420 * the memory segment, that should all be kdump
421 * reserved memory.
422 */
423 elfcorehdr_size = end - elfcorehdr_addr;
424 break;
425 }
426 }
427 }
428
429 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
430 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
431
432 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
433#endif
434}
435
436#ifdef CONFIG_KEXEC
437
438/* 64M alignment for crash kernel regions */
439#define CRASH_ALIGN SZ_64M
440#define CRASH_ADDR_MAX SZ_512M
441
442static void __init mips_parse_crashkernel(void)
443{
444 unsigned long long total_mem;
445 unsigned long long crash_size, crash_base;
446 int ret;
447
448 total_mem = memblock_phys_mem_size();
449 ret = parse_crashkernel(boot_command_line, total_mem,
450 &crash_size, &crash_base);
451 if (ret != 0 || crash_size <= 0)
452 return;
453
454 if (crash_base <= 0) {
455 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
456 crash_size, CRASH_ALIGN);
457 if (!crash_base) {
458 pr_warn("crashkernel reservation failed - No suitable area found.\n");
459 return;
460 }
461 } else {
462 unsigned long long start;
463
464 start = memblock_find_in_range(crash_base, crash_base + crash_size,
465 crash_size, 1);
466 if (start != crash_base) {
467 pr_warn("Invalid memory region reserved for crash kernel\n");
468 return;
469 }
470 }
471
472 crashk_res.start = crash_base;
473 crashk_res.end = crash_base + crash_size - 1;
474}
475
476static void __init request_crashkernel(struct resource *res)
477{
478 int ret;
479
480 if (crashk_res.start == crashk_res.end)
481 return;
482
483 ret = request_resource(res, &crashk_res);
484 if (!ret)
485 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
486 (unsigned long)(resource_size(&crashk_res) >> 20),
487 (unsigned long)(crashk_res.start >> 20));
488}
489#else /* !defined(CONFIG_KEXEC) */
490static void __init mips_parse_crashkernel(void)
491{
492}
493
494static void __init request_crashkernel(struct resource *res)
495{
496}
497#endif /* !defined(CONFIG_KEXEC) */
498
499static void __init check_kernel_sections_mem(void)
500{
501 phys_addr_t start = __pa_symbol(&_text);
502 phys_addr_t size = __pa_symbol(&_end) - start;
503
504 if (!memblock_is_region_memory(start, size)) {
505 pr_info("Kernel sections are not in the memory maps\n");
506 memblock_add(start, size);
507 }
508}
509
510static void __init bootcmdline_append(const char *s, size_t max)
511{
512 if (!s[0] || !max)
513 return;
514
515 if (boot_command_line[0])
516 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
517
518 strlcat(boot_command_line, s, max);
519}
520
521#ifdef CONFIG_OF_EARLY_FLATTREE
522
523static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
524 int depth, void *data)
525{
526 bool *dt_bootargs = data;
527 const char *p;
528 int l;
529
530 if (depth != 1 || !data ||
531 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
532 return 0;
533
534 p = of_get_flat_dt_prop(node, "bootargs", &l);
535 if (p != NULL && l > 0) {
536 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
537 *dt_bootargs = true;
538 }
539
540 return 1;
541}
542
543#endif /* CONFIG_OF_EARLY_FLATTREE */
544
545static void __init bootcmdline_init(void)
546{
547 bool dt_bootargs = false;
548
549 /*
550 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
551 * trivial - we simply use the built-in command line unconditionally &
552 * unmodified.
553 */
554 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
555 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
556 return;
557 }
558
559 /*
560 * If the user specified a built-in command line &
561 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
562 * prepended to arguments from the bootloader or DT so we'll copy them
563 * to the start of boot_command_line here. Otherwise, empty
564 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
565 */
566 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
567 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
568 else
569 boot_command_line[0] = 0;
570
571#ifdef CONFIG_OF_EARLY_FLATTREE
572 /*
573 * If we're configured to take boot arguments from DT, look for those
574 * now.
575 */
576 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
577 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
578 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
579#endif
580
581 /*
582 * If we didn't get any arguments from DT (regardless of whether that's
583 * because we weren't configured to look for them, or because we looked
584 * & found none) then we'll take arguments from the bootloader.
585 * plat_mem_setup() should have filled arcs_cmdline with arguments from
586 * the bootloader.
587 */
588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
589 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
590
591 /*
592 * If the user specified a built-in command line & we didn't already
593 * prepend it, we append it to boot_command_line here.
594 */
595 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
596 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
597 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
598}
599
600/*
601 * arch_mem_init - initialize memory management subsystem
602 *
603 * o plat_mem_setup() detects the memory configuration and will record detected
604 * memory areas using memblock_add.
605 *
606 * At this stage the memory configuration of the system is known to the
607 * kernel but generic memory management system is still entirely uninitialized.
608 *
609 * o bootmem_init()
610 * o sparse_init()
611 * o paging_init()
612 * o dma_contiguous_reserve()
613 *
614 * At this stage the bootmem allocator is ready to use.
615 *
616 * NOTE: historically plat_mem_setup did the entire platform initialization.
617 * This was rather impractical because it meant plat_mem_setup had to
618 * get away without any kind of memory allocator. To keep old code from
619 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
620 * initialization hook for anything else was introduced.
621 */
622static void __init arch_mem_init(char **cmdline_p)
623{
624 /* call board setup routine */
625 plat_mem_setup();
626 memblock_set_bottom_up(true);
627
628 bootcmdline_init();
629 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
630 *cmdline_p = command_line;
631
632 parse_early_param();
633
634 if (usermem)
635 pr_info("User-defined physical RAM map overwrite\n");
636
637 check_kernel_sections_mem();
638
639 early_init_fdt_reserve_self();
640 early_init_fdt_scan_reserved_mem();
641
642#ifndef CONFIG_NUMA
643 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
644#endif
645 bootmem_init();
646
647 /*
648 * Prevent memblock from allocating high memory.
649 * This cannot be done before max_low_pfn is detected, so up
650 * to this point is possible to only reserve physical memory
651 * with memblock_reserve; memblock_alloc* can be used
652 * only after this point
653 */
654 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
655
656 mips_reserve_vmcore();
657
658 mips_parse_crashkernel();
659#ifdef CONFIG_KEXEC
660 if (crashk_res.start != crashk_res.end)
661 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
662#endif
663 device_tree_init();
664
665 /*
666 * In order to reduce the possibility of kernel panic when failed to
667 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
668 * low memory as small as possible before plat_swiotlb_setup(), so
669 * make sparse_init() using top-down allocation.
670 */
671 memblock_set_bottom_up(false);
672 sparse_init();
673 memblock_set_bottom_up(true);
674
675 plat_swiotlb_setup();
676
677 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
678
679 /* Reserve for hibernation. */
680 memblock_reserve(__pa_symbol(&__nosave_begin),
681 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
682
683 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
684}
685
686static void __init resource_init(void)
687{
688 phys_addr_t start, end;
689 u64 i;
690
691 if (UNCAC_BASE != IO_BASE)
692 return;
693
694 code_resource.start = __pa_symbol(&_text);
695 code_resource.end = __pa_symbol(&_etext) - 1;
696 data_resource.start = __pa_symbol(&_etext);
697 data_resource.end = __pa_symbol(&_edata) - 1;
698 bss_resource.start = __pa_symbol(&__bss_start);
699 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
700
701 for_each_mem_range(i, &start, &end) {
702 struct resource *res;
703
704 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
705 if (!res)
706 panic("%s: Failed to allocate %zu bytes\n", __func__,
707 sizeof(struct resource));
708
709 res->start = start;
710 /*
711 * In memblock, end points to the first byte after the
712 * range while in resourses, end points to the last byte in
713 * the range.
714 */
715 res->end = end - 1;
716 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
717 res->name = "System RAM";
718
719 request_resource(&iomem_resource, res);
720
721 /*
722 * We don't know which RAM region contains kernel data,
723 * so we try it repeatedly and let the resource manager
724 * test it.
725 */
726 request_resource(res, &code_resource);
727 request_resource(res, &data_resource);
728 request_resource(res, &bss_resource);
729 request_crashkernel(res);
730 }
731}
732
733#ifdef CONFIG_SMP
734static void __init prefill_possible_map(void)
735{
736 int i, possible = num_possible_cpus();
737
738 if (possible > nr_cpu_ids)
739 possible = nr_cpu_ids;
740
741 for (i = 0; i < possible; i++)
742 set_cpu_possible(i, true);
743 for (; i < NR_CPUS; i++)
744 set_cpu_possible(i, false);
745
746 nr_cpu_ids = possible;
747}
748#else
749static inline void prefill_possible_map(void) {}
750#endif
751
752void __init setup_arch(char **cmdline_p)
753{
754 cpu_probe();
755 mips_cm_probe();
756 prom_init();
757
758 setup_early_fdc_console();
759#ifdef CONFIG_EARLY_PRINTK
760 setup_early_printk();
761#endif
762 cpu_report();
763 check_bugs_early();
764
765#if defined(CONFIG_VT)
766#if defined(CONFIG_VGA_CONSOLE)
767 conswitchp = &vga_con;
768#endif
769#endif
770
771 arch_mem_init(cmdline_p);
772 dmi_setup();
773
774 resource_init();
775 plat_smp_setup();
776 prefill_possible_map();
777
778 cpu_cache_init();
779 paging_init();
780
781 memblock_dump_all();
782}
783
784unsigned long kernelsp[NR_CPUS];
785unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
786
787#ifdef CONFIG_DEBUG_FS
788struct dentry *mips_debugfs_dir;
789static int __init debugfs_mips(void)
790{
791 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
792 return 0;
793}
794arch_initcall(debugfs_mips);
795#endif
796
797#ifdef CONFIG_DMA_NONCOHERENT
798static int __init setcoherentio(char *str)
799{
800 dma_default_coherent = true;
801 pr_info("Hardware DMA cache coherency (command line)\n");
802 return 0;
803}
804early_param("coherentio", setcoherentio);
805
806static int __init setnocoherentio(char *str)
807{
808 dma_default_coherent = true;
809 pr_info("Software DMA cache coherency (command line)\n");
810 return 0;
811}
812early_param("nocoherentio", setnocoherentio);
813#endif
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/bootmem.h>
19#include <linux/initrd.h>
20#include <linux/root_dev.h>
21#include <linux/highmem.h>
22#include <linux/console.h>
23#include <linux/pfn.h>
24#include <linux/debugfs.h>
25#include <linux/kexec.h>
26#include <linux/sizes.h>
27#include <linux/device.h>
28#include <linux/dma-contiguous.h>
29#include <linux/decompress/generic.h>
30
31#include <asm/addrspace.h>
32#include <asm/bootinfo.h>
33#include <asm/bugs.h>
34#include <asm/cache.h>
35#include <asm/cdmm.h>
36#include <asm/cpu.h>
37#include <asm/debug.h>
38#include <asm/sections.h>
39#include <asm/setup.h>
40#include <asm/smp-ops.h>
41#include <asm/prom.h>
42
43#ifdef CONFIG_MIPS_ELF_APPENDED_DTB
44const char __section(.appended_dtb) __appended_dtb[0x100000];
45#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
46
47struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
48
49EXPORT_SYMBOL(cpu_data);
50
51#ifdef CONFIG_VT
52struct screen_info screen_info;
53#endif
54
55/*
56 * Setup information
57 *
58 * These are initialized so they are in the .data section
59 */
60unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
61
62EXPORT_SYMBOL(mips_machtype);
63
64struct boot_mem_map boot_mem_map;
65
66static char __initdata command_line[COMMAND_LINE_SIZE];
67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
68
69#ifdef CONFIG_CMDLINE_BOOL
70static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
71#endif
72
73/*
74 * mips_io_port_base is the begin of the address space to which x86 style
75 * I/O ports are mapped.
76 */
77const unsigned long mips_io_port_base = -1;
78EXPORT_SYMBOL(mips_io_port_base);
79
80static struct resource code_resource = { .name = "Kernel code", };
81static struct resource data_resource = { .name = "Kernel data", };
82
83static void *detect_magic __initdata = detect_memory_region;
84
85void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
86{
87 int x = boot_mem_map.nr_map;
88 int i;
89
90 /*
91 * If the region reaches the top of the physical address space, adjust
92 * the size slightly so that (start + size) doesn't overflow
93 */
94 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
95 --size;
96
97 /* Sanity check */
98 if (start + size < start) {
99 pr_warn("Trying to add an invalid memory region, skipped\n");
100 return;
101 }
102
103 /*
104 * Try to merge with existing entry, if any.
105 */
106 for (i = 0; i < boot_mem_map.nr_map; i++) {
107 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
108 unsigned long top;
109
110 if (entry->type != type)
111 continue;
112
113 if (start + size < entry->addr)
114 continue; /* no overlap */
115
116 if (entry->addr + entry->size < start)
117 continue; /* no overlap */
118
119 top = max(entry->addr + entry->size, start + size);
120 entry->addr = min(entry->addr, start);
121 entry->size = top - entry->addr;
122
123 return;
124 }
125
126 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
127 pr_err("Ooops! Too many entries in the memory map!\n");
128 return;
129 }
130
131 boot_mem_map.map[x].addr = start;
132 boot_mem_map.map[x].size = size;
133 boot_mem_map.map[x].type = type;
134 boot_mem_map.nr_map++;
135}
136
137void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
138{
139 void *dm = &detect_magic;
140 phys_addr_t size;
141
142 for (size = sz_min; size < sz_max; size <<= 1) {
143 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
144 break;
145 }
146
147 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
148 ((unsigned long long) size) / SZ_1M,
149 (unsigned long long) start,
150 ((unsigned long long) sz_min) / SZ_1M,
151 ((unsigned long long) sz_max) / SZ_1M);
152
153 add_memory_region(start, size, BOOT_MEM_RAM);
154}
155
156static void __init print_memory_map(void)
157{
158 int i;
159 const int field = 2 * sizeof(unsigned long);
160
161 for (i = 0; i < boot_mem_map.nr_map; i++) {
162 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
163 field, (unsigned long long) boot_mem_map.map[i].size,
164 field, (unsigned long long) boot_mem_map.map[i].addr);
165
166 switch (boot_mem_map.map[i].type) {
167 case BOOT_MEM_RAM:
168 printk(KERN_CONT "(usable)\n");
169 break;
170 case BOOT_MEM_INIT_RAM:
171 printk(KERN_CONT "(usable after init)\n");
172 break;
173 case BOOT_MEM_ROM_DATA:
174 printk(KERN_CONT "(ROM data)\n");
175 break;
176 case BOOT_MEM_RESERVED:
177 printk(KERN_CONT "(reserved)\n");
178 break;
179 default:
180 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
181 break;
182 }
183 }
184}
185
186/*
187 * Manage initrd
188 */
189#ifdef CONFIG_BLK_DEV_INITRD
190
191static int __init rd_start_early(char *p)
192{
193 unsigned long start = memparse(p, &p);
194
195#ifdef CONFIG_64BIT
196 /* Guess if the sign extension was forgotten by bootloader */
197 if (start < XKPHYS)
198 start = (int)start;
199#endif
200 initrd_start = start;
201 initrd_end += start;
202 return 0;
203}
204early_param("rd_start", rd_start_early);
205
206static int __init rd_size_early(char *p)
207{
208 initrd_end += memparse(p, &p);
209 return 0;
210}
211early_param("rd_size", rd_size_early);
212
213/* it returns the next free pfn after initrd */
214static unsigned long __init init_initrd(void)
215{
216 unsigned long end;
217
218 /*
219 * Board specific code or command line parser should have
220 * already set up initrd_start and initrd_end. In these cases
221 * perfom sanity checks and use them if all looks good.
222 */
223 if (!initrd_start || initrd_end <= initrd_start)
224 goto disable;
225
226 if (initrd_start & ~PAGE_MASK) {
227 pr_err("initrd start must be page aligned\n");
228 goto disable;
229 }
230 if (initrd_start < PAGE_OFFSET) {
231 pr_err("initrd start < PAGE_OFFSET\n");
232 goto disable;
233 }
234
235 /*
236 * Sanitize initrd addresses. For example firmware
237 * can't guess if they need to pass them through
238 * 64-bits values if the kernel has been built in pure
239 * 32-bit. We need also to switch from KSEG0 to XKPHYS
240 * addresses now, so the code can now safely use __pa().
241 */
242 end = __pa(initrd_end);
243 initrd_end = (unsigned long)__va(end);
244 initrd_start = (unsigned long)__va(__pa(initrd_start));
245
246 ROOT_DEV = Root_RAM0;
247 return PFN_UP(end);
248disable:
249 initrd_start = 0;
250 initrd_end = 0;
251 return 0;
252}
253
254/* In some conditions (e.g. big endian bootloader with a little endian
255 kernel), the initrd might appear byte swapped. Try to detect this and
256 byte swap it if needed. */
257static void __init maybe_bswap_initrd(void)
258{
259#if defined(CONFIG_CPU_CAVIUM_OCTEON)
260 u64 buf;
261
262 /* Check for CPIO signature */
263 if (!memcmp((void *)initrd_start, "070701", 6))
264 return;
265
266 /* Check for compressed initrd */
267 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
268 return;
269
270 /* Try again with a byte swapped header */
271 buf = swab64p((u64 *)initrd_start);
272 if (!memcmp(&buf, "070701", 6) ||
273 decompress_method((unsigned char *)(&buf), 8, NULL)) {
274 unsigned long i;
275
276 pr_info("Byteswapped initrd detected\n");
277 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
278 swab64s((u64 *)i);
279 }
280#endif
281}
282
283static void __init finalize_initrd(void)
284{
285 unsigned long size = initrd_end - initrd_start;
286
287 if (size == 0) {
288 printk(KERN_INFO "Initrd not found or empty");
289 goto disable;
290 }
291 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
292 printk(KERN_ERR "Initrd extends beyond end of memory");
293 goto disable;
294 }
295
296 maybe_bswap_initrd();
297
298 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
299 initrd_below_start_ok = 1;
300
301 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
302 initrd_start, size);
303 return;
304disable:
305 printk(KERN_CONT " - disabling initrd\n");
306 initrd_start = 0;
307 initrd_end = 0;
308}
309
310#else /* !CONFIG_BLK_DEV_INITRD */
311
312static unsigned long __init init_initrd(void)
313{
314 return 0;
315}
316
317#define finalize_initrd() do {} while (0)
318
319#endif
320
321/*
322 * Initialize the bootmem allocator. It also setup initrd related data
323 * if needed.
324 */
325#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
326
327static void __init bootmem_init(void)
328{
329 init_initrd();
330 finalize_initrd();
331}
332
333#else /* !CONFIG_SGI_IP27 */
334
335static void __init bootmem_init(void)
336{
337 unsigned long reserved_end;
338 unsigned long mapstart = ~0UL;
339 unsigned long bootmap_size;
340 int i;
341
342 /*
343 * Sanity check any INITRD first. We don't take it into account
344 * for bootmem setup initially, rely on the end-of-kernel-code
345 * as our memory range starting point. Once bootmem is inited we
346 * will reserve the area used for the initrd.
347 */
348 init_initrd();
349 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
350
351 /*
352 * max_low_pfn is not a number of pages. The number of pages
353 * of the system is given by 'max_low_pfn - min_low_pfn'.
354 */
355 min_low_pfn = ~0UL;
356 max_low_pfn = 0;
357
358 /*
359 * Find the highest page frame number we have available.
360 */
361 for (i = 0; i < boot_mem_map.nr_map; i++) {
362 unsigned long start, end;
363
364 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
365 continue;
366
367 start = PFN_UP(boot_mem_map.map[i].addr);
368 end = PFN_DOWN(boot_mem_map.map[i].addr
369 + boot_mem_map.map[i].size);
370
371#ifndef CONFIG_HIGHMEM
372 /*
373 * Skip highmem here so we get an accurate max_low_pfn if low
374 * memory stops short of high memory.
375 * If the region overlaps HIGHMEM_START, end is clipped so
376 * max_pfn excludes the highmem portion.
377 */
378 if (start >= PFN_DOWN(HIGHMEM_START))
379 continue;
380 if (end > PFN_DOWN(HIGHMEM_START))
381 end = PFN_DOWN(HIGHMEM_START);
382#endif
383
384 if (end > max_low_pfn)
385 max_low_pfn = end;
386 if (start < min_low_pfn)
387 min_low_pfn = start;
388 if (end <= reserved_end)
389 continue;
390#ifdef CONFIG_BLK_DEV_INITRD
391 /* Skip zones before initrd and initrd itself */
392 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
393 continue;
394#endif
395 if (start >= mapstart)
396 continue;
397 mapstart = max(reserved_end, start);
398 }
399
400 if (min_low_pfn >= max_low_pfn)
401 panic("Incorrect memory mapping !!!");
402 if (min_low_pfn > ARCH_PFN_OFFSET) {
403 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
404 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
405 min_low_pfn - ARCH_PFN_OFFSET);
406 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
407 pr_info("%lu free pages won't be used\n",
408 ARCH_PFN_OFFSET - min_low_pfn);
409 }
410 min_low_pfn = ARCH_PFN_OFFSET;
411
412 /*
413 * Determine low and high memory ranges
414 */
415 max_pfn = max_low_pfn;
416 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
417#ifdef CONFIG_HIGHMEM
418 highstart_pfn = PFN_DOWN(HIGHMEM_START);
419 highend_pfn = max_low_pfn;
420#endif
421 max_low_pfn = PFN_DOWN(HIGHMEM_START);
422 }
423
424#ifdef CONFIG_BLK_DEV_INITRD
425 /*
426 * mapstart should be after initrd_end
427 */
428 if (initrd_end)
429 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
430#endif
431
432 /*
433 * Initialize the boot-time allocator with low memory only.
434 */
435 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
436 min_low_pfn, max_low_pfn);
437
438
439 for (i = 0; i < boot_mem_map.nr_map; i++) {
440 unsigned long start, end;
441
442 start = PFN_UP(boot_mem_map.map[i].addr);
443 end = PFN_DOWN(boot_mem_map.map[i].addr
444 + boot_mem_map.map[i].size);
445
446 if (start <= min_low_pfn)
447 start = min_low_pfn;
448 if (start >= end)
449 continue;
450
451#ifndef CONFIG_HIGHMEM
452 if (end > max_low_pfn)
453 end = max_low_pfn;
454
455 /*
456 * ... finally, is the area going away?
457 */
458 if (end <= start)
459 continue;
460#endif
461
462 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
463 }
464
465 /*
466 * Register fully available low RAM pages with the bootmem allocator.
467 */
468 for (i = 0; i < boot_mem_map.nr_map; i++) {
469 unsigned long start, end, size;
470
471 start = PFN_UP(boot_mem_map.map[i].addr);
472 end = PFN_DOWN(boot_mem_map.map[i].addr
473 + boot_mem_map.map[i].size);
474
475 /*
476 * Reserve usable memory.
477 */
478 switch (boot_mem_map.map[i].type) {
479 case BOOT_MEM_RAM:
480 break;
481 case BOOT_MEM_INIT_RAM:
482 memory_present(0, start, end);
483 continue;
484 default:
485 /* Not usable memory */
486 continue;
487 }
488
489 /*
490 * We are rounding up the start address of usable memory
491 * and at the end of the usable range downwards.
492 */
493 if (start >= max_low_pfn)
494 continue;
495 if (start < reserved_end)
496 start = reserved_end;
497 if (end > max_low_pfn)
498 end = max_low_pfn;
499
500 /*
501 * ... finally, is the area going away?
502 */
503 if (end <= start)
504 continue;
505 size = end - start;
506
507 /* Register lowmem ranges */
508 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
509 memory_present(0, start, end);
510 }
511
512 /*
513 * Reserve the bootmap memory.
514 */
515 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
516
517#ifdef CONFIG_RELOCATABLE
518 /*
519 * The kernel reserves all memory below its _end symbol as bootmem,
520 * but the kernel may now be at a much higher address. The memory
521 * between the original and new locations may be returned to the system.
522 */
523 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
524 unsigned long offset;
525 extern void show_kernel_relocation(const char *level);
526
527 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
528 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
529
530#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
531 /*
532 * This information is necessary when debugging the kernel
533 * But is a security vulnerability otherwise!
534 */
535 show_kernel_relocation(KERN_INFO);
536#endif
537 }
538#endif
539
540 /*
541 * Reserve initrd memory if needed.
542 */
543 finalize_initrd();
544}
545
546#endif /* CONFIG_SGI_IP27 */
547
548/*
549 * arch_mem_init - initialize memory management subsystem
550 *
551 * o plat_mem_setup() detects the memory configuration and will record detected
552 * memory areas using add_memory_region.
553 *
554 * At this stage the memory configuration of the system is known to the
555 * kernel but generic memory management system is still entirely uninitialized.
556 *
557 * o bootmem_init()
558 * o sparse_init()
559 * o paging_init()
560 * o dma_contiguous_reserve()
561 *
562 * At this stage the bootmem allocator is ready to use.
563 *
564 * NOTE: historically plat_mem_setup did the entire platform initialization.
565 * This was rather impractical because it meant plat_mem_setup had to
566 * get away without any kind of memory allocator. To keep old code from
567 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
568 * initialization hook for anything else was introduced.
569 */
570
571static int usermem __initdata;
572
573static int __init early_parse_mem(char *p)
574{
575 phys_addr_t start, size;
576
577 /*
578 * If a user specifies memory size, we
579 * blow away any automatically generated
580 * size.
581 */
582 if (usermem == 0) {
583 boot_mem_map.nr_map = 0;
584 usermem = 1;
585 }
586 start = 0;
587 size = memparse(p, &p);
588 if (*p == '@')
589 start = memparse(p + 1, &p);
590
591 add_memory_region(start, size, BOOT_MEM_RAM);
592 return 0;
593}
594early_param("mem", early_parse_mem);
595
596#ifdef CONFIG_PROC_VMCORE
597unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
598static int __init early_parse_elfcorehdr(char *p)
599{
600 int i;
601
602 setup_elfcorehdr = memparse(p, &p);
603
604 for (i = 0; i < boot_mem_map.nr_map; i++) {
605 unsigned long start = boot_mem_map.map[i].addr;
606 unsigned long end = (boot_mem_map.map[i].addr +
607 boot_mem_map.map[i].size);
608 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
609 /*
610 * Reserve from the elf core header to the end of
611 * the memory segment, that should all be kdump
612 * reserved memory.
613 */
614 setup_elfcorehdr_size = end - setup_elfcorehdr;
615 break;
616 }
617 }
618 /*
619 * If we don't find it in the memory map, then we shouldn't
620 * have to worry about it, as the new kernel won't use it.
621 */
622 return 0;
623}
624early_param("elfcorehdr", early_parse_elfcorehdr);
625#endif
626
627static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
628{
629 phys_addr_t size;
630 int i;
631
632 size = end - mem;
633 if (!size)
634 return;
635
636 /* Make sure it is in the boot_mem_map */
637 for (i = 0; i < boot_mem_map.nr_map; i++) {
638 if (mem >= boot_mem_map.map[i].addr &&
639 mem < (boot_mem_map.map[i].addr +
640 boot_mem_map.map[i].size))
641 return;
642 }
643 add_memory_region(mem, size, type);
644}
645
646#ifdef CONFIG_KEXEC
647static inline unsigned long long get_total_mem(void)
648{
649 unsigned long long total;
650
651 total = max_pfn - min_low_pfn;
652 return total << PAGE_SHIFT;
653}
654
655static void __init mips_parse_crashkernel(void)
656{
657 unsigned long long total_mem;
658 unsigned long long crash_size, crash_base;
659 int ret;
660
661 total_mem = get_total_mem();
662 ret = parse_crashkernel(boot_command_line, total_mem,
663 &crash_size, &crash_base);
664 if (ret != 0 || crash_size <= 0)
665 return;
666
667 crashk_res.start = crash_base;
668 crashk_res.end = crash_base + crash_size - 1;
669}
670
671static void __init request_crashkernel(struct resource *res)
672{
673 int ret;
674
675 ret = request_resource(res, &crashk_res);
676 if (!ret)
677 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
678 (unsigned long)((crashk_res.end -
679 crashk_res.start + 1) >> 20),
680 (unsigned long)(crashk_res.start >> 20));
681}
682#else /* !defined(CONFIG_KEXEC) */
683static void __init mips_parse_crashkernel(void)
684{
685}
686
687static void __init request_crashkernel(struct resource *res)
688{
689}
690#endif /* !defined(CONFIG_KEXEC) */
691
692#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
693#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
694#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
695#define BUILTIN_EXTEND_WITH_PROM \
696 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
697
698static void __init arch_mem_init(char **cmdline_p)
699{
700 struct memblock_region *reg;
701 extern void plat_mem_setup(void);
702
703 /* call board setup routine */
704 plat_mem_setup();
705
706 /*
707 * Make sure all kernel memory is in the maps. The "UP" and
708 * "DOWN" are opposite for initdata since if it crosses over
709 * into another memory section you don't want that to be
710 * freed when the initdata is freed.
711 */
712 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
713 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
714 BOOT_MEM_RAM);
715 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
716 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
717 BOOT_MEM_INIT_RAM);
718
719 pr_info("Determined physical RAM map:\n");
720 print_memory_map();
721
722#if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
723 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
724#else
725 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
726 (USE_DTB_CMDLINE && !boot_command_line[0]))
727 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
728
729 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
730 if (boot_command_line[0])
731 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
732 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
733 }
734
735#if defined(CONFIG_CMDLINE_BOOL)
736 if (builtin_cmdline[0]) {
737 if (boot_command_line[0])
738 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
739 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
740 }
741
742 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
743 if (boot_command_line[0])
744 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
745 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
746 }
747#endif
748#endif
749 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
750
751 *cmdline_p = command_line;
752
753 parse_early_param();
754
755 if (usermem) {
756 pr_info("User-defined physical RAM map:\n");
757 print_memory_map();
758 }
759
760 bootmem_init();
761#ifdef CONFIG_PROC_VMCORE
762 if (setup_elfcorehdr && setup_elfcorehdr_size) {
763 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
764 setup_elfcorehdr, setup_elfcorehdr_size);
765 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
766 BOOTMEM_DEFAULT);
767 }
768#endif
769
770 mips_parse_crashkernel();
771#ifdef CONFIG_KEXEC
772 if (crashk_res.start != crashk_res.end)
773 reserve_bootmem(crashk_res.start,
774 crashk_res.end - crashk_res.start + 1,
775 BOOTMEM_DEFAULT);
776#endif
777 device_tree_init();
778 sparse_init();
779 plat_swiotlb_setup();
780
781 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
782 /* Tell bootmem about cma reserved memblock section */
783 for_each_memblock(reserved, reg)
784 if (reg->size != 0)
785 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
786
787 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
788 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
789}
790
791static void __init resource_init(void)
792{
793 int i;
794
795 if (UNCAC_BASE != IO_BASE)
796 return;
797
798 code_resource.start = __pa_symbol(&_text);
799 code_resource.end = __pa_symbol(&_etext) - 1;
800 data_resource.start = __pa_symbol(&_etext);
801 data_resource.end = __pa_symbol(&_edata) - 1;
802
803 for (i = 0; i < boot_mem_map.nr_map; i++) {
804 struct resource *res;
805 unsigned long start, end;
806
807 start = boot_mem_map.map[i].addr;
808 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
809 if (start >= HIGHMEM_START)
810 continue;
811 if (end >= HIGHMEM_START)
812 end = HIGHMEM_START - 1;
813
814 res = alloc_bootmem(sizeof(struct resource));
815
816 res->start = start;
817 res->end = end;
818 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
819
820 switch (boot_mem_map.map[i].type) {
821 case BOOT_MEM_RAM:
822 case BOOT_MEM_INIT_RAM:
823 case BOOT_MEM_ROM_DATA:
824 res->name = "System RAM";
825 res->flags |= IORESOURCE_SYSRAM;
826 break;
827 case BOOT_MEM_RESERVED:
828 default:
829 res->name = "reserved";
830 }
831
832 request_resource(&iomem_resource, res);
833
834 /*
835 * We don't know which RAM region contains kernel data,
836 * so we try it repeatedly and let the resource manager
837 * test it.
838 */
839 request_resource(res, &code_resource);
840 request_resource(res, &data_resource);
841 request_crashkernel(res);
842 }
843}
844
845#ifdef CONFIG_SMP
846static void __init prefill_possible_map(void)
847{
848 int i, possible = num_possible_cpus();
849
850 if (possible > nr_cpu_ids)
851 possible = nr_cpu_ids;
852
853 for (i = 0; i < possible; i++)
854 set_cpu_possible(i, true);
855 for (; i < NR_CPUS; i++)
856 set_cpu_possible(i, false);
857
858 nr_cpu_ids = possible;
859}
860#else
861static inline void prefill_possible_map(void) {}
862#endif
863
864void __init setup_arch(char **cmdline_p)
865{
866 cpu_probe();
867 mips_cm_probe();
868 prom_init();
869
870 setup_early_fdc_console();
871#ifdef CONFIG_EARLY_PRINTK
872 setup_early_printk();
873#endif
874 cpu_report();
875 check_bugs_early();
876
877#if defined(CONFIG_VT)
878#if defined(CONFIG_VGA_CONSOLE)
879 conswitchp = &vga_con;
880#elif defined(CONFIG_DUMMY_CONSOLE)
881 conswitchp = &dummy_con;
882#endif
883#endif
884
885 arch_mem_init(cmdline_p);
886
887 resource_init();
888 plat_smp_setup();
889 prefill_possible_map();
890
891 cpu_cache_init();
892 paging_init();
893}
894
895unsigned long kernelsp[NR_CPUS];
896unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
897
898#ifdef CONFIG_USE_OF
899unsigned long fw_passed_dtb;
900#endif
901
902#ifdef CONFIG_DEBUG_FS
903struct dentry *mips_debugfs_dir;
904static int __init debugfs_mips(void)
905{
906 struct dentry *d;
907
908 d = debugfs_create_dir("mips", NULL);
909 if (!d)
910 return -ENOMEM;
911 mips_debugfs_dir = d;
912 return 0;
913}
914arch_initcall(debugfs_mips);
915#endif