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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
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
59
60
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
77
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
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
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
143static unsigned long __init init_initrd(void)
144{
145 unsigned long end;
146
147
148
149
150
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
166
167
168
169
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
184
185
186static void __init maybe_bswap_initrd(void)
187{
188#if defined(CONFIG_CPU_CAVIUM_OCTEON)
189 u64 buf;
190
191
192 if (!memcmp((void *)initrd_start, "070701", 6))
193 return;
194
195
196 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
197 return;
198
199
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
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
252
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
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
275
276
277
278
279 init_initrd();
280
281
282 memblock_reserve(__pa_symbol(&_text),
283 __pa_symbol(&_end) - __pa_symbol(&_text));
284
285
286
287#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
288 ARCH_PFN_OFFSET = PFN_UP(ramstart);
289#else
290
291
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
308
309
310
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
335
336 finalize_initrd();
337}
338
339#endif
340
341static int usermem __initdata;
342
343static int __init early_parse_mem(char *p)
344{
345 phys_addr_t start, size;
346
347
348
349
350
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
420
421
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
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_phys_alloc_range(crash_size, CRASH_ALIGN,
456 CRASH_ALIGN,
457 CRASH_ADDR_MAX);
458 if (!crash_base) {
459 pr_warn("crashkernel reservation failed - No suitable area found.\n");
460 return;
461 }
462 } else {
463 unsigned long long start;
464
465 start = memblock_phys_alloc_range(crash_size, 1,
466 crash_base,
467 crash_base + crash_size);
468 if (start != crash_base) {
469 pr_warn("Invalid memory region reserved for crash kernel\n");
470 return;
471 }
472 }
473
474 crashk_res.start = crash_base;
475 crashk_res.end = crash_base + crash_size - 1;
476}
477
478static void __init request_crashkernel(struct resource *res)
479{
480 int ret;
481
482 if (crashk_res.start == crashk_res.end)
483 return;
484
485 ret = request_resource(res, &crashk_res);
486 if (!ret)
487 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
488 (unsigned long)(resource_size(&crashk_res) >> 20),
489 (unsigned long)(crashk_res.start >> 20));
490}
491#else
492static void __init mips_parse_crashkernel(void)
493{
494}
495
496static void __init request_crashkernel(struct resource *res)
497{
498}
499#endif
500
501static void __init check_kernel_sections_mem(void)
502{
503 phys_addr_t start = __pa_symbol(&_text);
504 phys_addr_t size = __pa_symbol(&_end) - start;
505
506 if (!memblock_is_region_memory(start, size)) {
507 pr_info("Kernel sections are not in the memory maps\n");
508 memblock_add(start, size);
509 }
510}
511
512static void __init bootcmdline_append(const char *s, size_t max)
513{
514 if (!s[0] || !max)
515 return;
516
517 if (boot_command_line[0])
518 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
519
520 strlcat(boot_command_line, s, max);
521}
522
523#ifdef CONFIG_OF_EARLY_FLATTREE
524
525static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
526 int depth, void *data)
527{
528 bool *dt_bootargs = data;
529 const char *p;
530 int l;
531
532 if (depth != 1 || !data ||
533 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
534 return 0;
535
536 p = of_get_flat_dt_prop(node, "bootargs", &l);
537 if (p != NULL && l > 0) {
538 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
539 *dt_bootargs = true;
540 }
541
542 return 1;
543}
544
545#endif
546
547static void __init bootcmdline_init(void)
548{
549 bool dt_bootargs = false;
550
551
552
553
554
555
556 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
557 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
558 return;
559 }
560
561
562
563
564
565
566
567
568 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
569 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
570 else
571 boot_command_line[0] = 0;
572
573#ifdef CONFIG_OF_EARLY_FLATTREE
574
575
576
577
578 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
579 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
580 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
581#endif
582
583
584
585
586
587
588
589
590 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
591 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
592
593
594
595
596
597 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
598 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
599 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
600}
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622
623
624static void __init arch_mem_init(char **cmdline_p)
625{
626
627 plat_mem_setup();
628 memblock_set_bottom_up(true);
629
630 bootcmdline_init();
631 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
632 *cmdline_p = command_line;
633
634 parse_early_param();
635
636 if (usermem)
637 pr_info("User-defined physical RAM map overwrite\n");
638
639 check_kernel_sections_mem();
640
641 early_init_fdt_reserve_self();
642 early_init_fdt_scan_reserved_mem();
643
644#ifndef CONFIG_NUMA
645 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
646#endif
647 bootmem_init();
648
649
650
651
652
653
654
655
656 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
657
658 mips_reserve_vmcore();
659
660 mips_parse_crashkernel();
661 device_tree_init();
662
663
664
665
666
667
668
669 memblock_set_bottom_up(false);
670 sparse_init();
671 memblock_set_bottom_up(true);
672
673 plat_swiotlb_setup();
674
675 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
676
677
678 memblock_reserve(__pa_symbol(&__nosave_begin),
679 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
680
681 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
682}
683
684static void __init resource_init(void)
685{
686 phys_addr_t start, end;
687 u64 i;
688
689 if (UNCAC_BASE != IO_BASE)
690 return;
691
692 code_resource.start = __pa_symbol(&_text);
693 code_resource.end = __pa_symbol(&_etext) - 1;
694 data_resource.start = __pa_symbol(&_etext);
695 data_resource.end = __pa_symbol(&_edata) - 1;
696 bss_resource.start = __pa_symbol(&__bss_start);
697 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
698
699 for_each_mem_range(i, &start, &end) {
700 struct resource *res;
701
702 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
703 if (!res)
704 panic("%s: Failed to allocate %zu bytes\n", __func__,
705 sizeof(struct resource));
706
707 res->start = start;
708
709
710
711
712
713 res->end = end - 1;
714 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
715 res->name = "System RAM";
716
717 request_resource(&iomem_resource, res);
718
719
720
721
722
723
724 request_resource(res, &code_resource);
725 request_resource(res, &data_resource);
726 request_resource(res, &bss_resource);
727 request_crashkernel(res);
728 }
729}
730
731#ifdef CONFIG_SMP
732static void __init prefill_possible_map(void)
733{
734 int i, possible = num_possible_cpus();
735
736 if (possible > nr_cpu_ids)
737 possible = nr_cpu_ids;
738
739 for (i = 0; i < possible; i++)
740 set_cpu_possible(i, true);
741 for (; i < NR_CPUS; i++)
742 set_cpu_possible(i, false);
743
744 nr_cpu_ids = possible;
745}
746#else
747static inline void prefill_possible_map(void) {}
748#endif
749
750void __init setup_arch(char **cmdline_p)
751{
752 cpu_probe();
753 mips_cm_probe();
754 prom_init();
755
756 setup_early_fdc_console();
757#ifdef CONFIG_EARLY_PRINTK
758 setup_early_printk();
759#endif
760 cpu_report();
761 check_bugs_early();
762
763#if defined(CONFIG_VT)
764#if defined(CONFIG_VGA_CONSOLE)
765 conswitchp = &vga_con;
766#endif
767#endif
768
769 arch_mem_init(cmdline_p);
770 dmi_setup();
771
772 resource_init();
773 plat_smp_setup();
774 prefill_possible_map();
775
776 cpu_cache_init();
777 paging_init();
778
779 memblock_dump_all();
780}
781
782unsigned long kernelsp[NR_CPUS];
783unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
784
785#ifdef CONFIG_DEBUG_FS
786struct dentry *mips_debugfs_dir;
787static int __init debugfs_mips(void)
788{
789 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
790 return 0;
791}
792arch_initcall(debugfs_mips);
793#endif
794
795#ifdef CONFIG_DMA_NONCOHERENT
796static int __init setcoherentio(char *str)
797{
798 dma_default_coherent = true;
799 pr_info("Hardware DMA cache coherency (command line)\n");
800 return 0;
801}
802early_param("coherentio", setcoherentio);
803
804static int __init setnocoherentio(char *str)
805{
806 dma_default_coherent = true;
807 pr_info("Software DMA cache coherency (command line)\n");
808 return 0;
809}
810early_param("nocoherentio", setnocoherentio);
811#endif
812