summaryrefslogtreecommitdiffstats
path: root/arch/loongarch/kernel/setup.c
blob: 634ef17fd38bf10d8bd9deef8a6693f0f4777c1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
 *
 * Derived from MIPS:
 * Copyright (C) 1995 Linus Torvalds
 * Copyright (C) 1995 Waldorf Electronics
 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
 * Copyright (C) 1996 Stoned Elipot
 * Copyright (C) 1999 Silicon Graphics, Inc.
 * Copyright (C) 2000, 2001, 2002, 2007	 Maciej W. Rozycki
 */
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/export.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/ioport.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/pfn.h>
#include <linux/platform_device.h>
#include <linux/sizes.h>
#include <linux/device.h>
#include <linux/dma-map-ops.h>
#include <linux/libfdt.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <linux/suspend.h>
#include <linux/swiotlb.h>

#include <asm/addrspace.h>
#include <asm/alternative.h>
#include <asm/bootinfo.h>
#include <asm/cache.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/efi.h>
#include <asm/loongson.h>
#include <asm/numa.h>
#include <asm/pgalloc.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/time.h>

#define SMBIOS_BIOSSIZE_OFFSET		0x09
#define SMBIOS_BIOSEXTERN_OFFSET	0x13
#define SMBIOS_FREQLOW_OFFSET		0x16
#define SMBIOS_FREQHIGH_OFFSET		0x17
#define SMBIOS_FREQLOW_MASK		0xFF
#define SMBIOS_CORE_PACKAGE_OFFSET	0x23
#define LOONGSON_EFI_ENABLE		(1 << 3)

unsigned long fw_arg0, fw_arg1, fw_arg2;
DEFINE_PER_CPU(unsigned long, kernelsp);
struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(cpu_data);

struct loongson_board_info b_info;
static const char dmi_empty_string[] = "        ";

/*
 * Setup information
 *
 * These are initialized so they are in the .data section
 */
char init_command_line[COMMAND_LINE_SIZE] __initdata;

static int num_standard_resources;
static struct resource *standard_resources;

static struct resource code_resource = { .name = "Kernel code", };
static struct resource data_resource = { .name = "Kernel data", };
static struct resource bss_resource  = { .name = "Kernel bss", };

const char *get_system_type(void)
{
	return "generic-loongson-machine";
}

void __init arch_cpu_finalize_init(void)
{
	alternative_instructions();
}

static const char *dmi_string_parse(const struct dmi_header *dm, u8 s)
{
	const u8 *bp = ((u8 *) dm) + dm->length;

	if (s) {
		s--;
		while (s > 0 && *bp) {
			bp += strlen(bp) + 1;
			s--;
		}

		if (*bp != 0) {
			size_t len = strlen(bp)+1;
			size_t cmp_len = len > 8 ? 8 : len;

			if (!memcmp(bp, dmi_empty_string, cmp_len))
				return dmi_empty_string;

			return bp;
		}
	}

	return "";
}

static void __init parse_cpu_table(const struct dmi_header *dm)
{
	long freq_temp = 0;
	char *dmi_data = (char *)dm;

	freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
			((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
	cpu_clock_freq = freq_temp * 1000000;

	loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
	loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);

	pr_info("CpuClock = %llu\n", cpu_clock_freq);
}

static void __init parse_bios_table(const struct dmi_header *dm)
{
	char *dmi_data = (char *)dm;

	b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
}

static void __init find_tokens(const struct dmi_header *dm, void *dummy)
{
	switch (dm->type) {
	case 0x0: /* Extern BIOS */
		parse_bios_table(dm);
		break;
	case 0x4: /* Calling interface */
		parse_cpu_table(dm);
		break;
	}
}
static void __init smbios_parse(void)
{
	b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
	b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
	b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
	b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
	b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
	dmi_walk(find_tokens, NULL);
}

#ifdef CONFIG_ARCH_WRITECOMBINE
bool wc_enabled = true;
#else
bool wc_enabled = false;
#endif

EXPORT_SYMBOL(wc_enabled);

static int __init setup_writecombine(char *p)
{
	if (!strcmp(p, "on"))
		wc_enabled = true;
	else if (!strcmp(p, "off"))
		wc_enabled = false;
	else
		pr_warn("Unknown writecombine setting \"%s\".\n", p);

	return 0;
}
early_param("writecombine", setup_writecombine);

static int usermem __initdata;

static int __init early_parse_mem(char *p)
{
	phys_addr_t start, size;

	if (!p) {
		pr_err("mem parameter is empty, do nothing\n");
		return -EINVAL;
	}

	/*
	 * If a user specifies memory size, we
	 * blow away any automatically generated
	 * size.
	 */
	if (usermem == 0) {
		usermem = 1;
		memblock_remove(memblock_start_of_DRAM(),
			memblock_end_of_DRAM() - memblock_start_of_DRAM());
	}
	start = 0;
	size = memparse(p, &p);
	if (*p == '@')
		start = memparse(p + 1, &p);
	else {
		pr_err("Invalid format!\n");
		return -EINVAL;
	}

	if (!IS_ENABLED(CONFIG_NUMA))
		memblock_add(start, size);
	else
		memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);

	return 0;
}
early_param("mem", early_parse_mem);

static void __init arch_reserve_vmcore(void)
{
#ifdef CONFIG_PROC_VMCORE
	u64 i;
	phys_addr_t start, end;

	if (!is_kdump_kernel())
		return;

	if (!elfcorehdr_size) {
		for_each_mem_range(i, &start, &end) {
			if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
				/*
				 * Reserve from the elf core header to the end of
				 * the memory segment, that should all be kdump
				 * reserved memory.
				 */
				elfcorehdr_size = end - elfcorehdr_addr;
				break;
			}
		}
	}

	if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
		pr_warn("elfcorehdr is overlapped\n");
		return;
	}

	memblock_reserve(elfcorehdr_addr, elfcorehdr_size);

	pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
		elfcorehdr_size >> 10, elfcorehdr_addr);
#endif
}

static void __init arch_reserve_crashkernel(void)
{
	int ret;
	unsigned long long low_size = 0;
	unsigned long long crash_base, crash_size;
	char *cmdline = boot_command_line;
	bool high = false;

	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
		return;

	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
				&crash_size, &crash_base, &low_size, &high);
	if (ret)
		return;

	reserve_crashkernel_generic(cmdline, crash_size, crash_base, low_size, high);
}

static void __init fdt_setup(void)
{
#ifdef CONFIG_OF_EARLY_FLATTREE
	void *fdt_pointer;

	/* ACPI-based systems do not require parsing fdt */
	if (acpi_os_get_root_pointer())
		return;

	/* Prefer to use built-in dtb, checking its legality first. */
	if (!fdt_check_header(__dtb_start))
		fdt_pointer = __dtb_start;
	else
		fdt_pointer = efi_fdt_pointer(); /* Fallback to firmware dtb */

	if (!fdt_pointer || fdt_check_header(fdt_pointer))
		return;

	early_init_dt_scan(fdt_pointer);
	early_init_fdt_reserve_self();

	max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
#endif
}

static void __init bootcmdline_init(char **cmdline_p)
{
	/*
	 * If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
	 * is trivial - we simply use the built-in command line unconditionally &
	 * unmodified.
	 */
	if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
		goto out;
	}

#ifdef CONFIG_OF_FLATTREE
	/*
	 * If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
	 * the boot_command_line will be overwritten by early_init_dt_scan_chosen().
	 * So we need to append init_command_line (the original copy of boot_command_line)
	 * to boot_command_line.
	 */
	if (initial_boot_params) {
		if (boot_command_line[0])
			strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);

		if (!strstr(boot_command_line, init_command_line))
			strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);

		goto out;
	}
#endif

	/*
	 * Append built-in command line to the bootloader command line if
	 * CONFIG_CMDLINE_EXTEND is enabled.
	 */
	if (IS_ENABLED(CONFIG_CMDLINE_EXTEND) && CONFIG_CMDLINE[0]) {
		strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
		strlcat(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
	}

	/*
	 * Use built-in command line if the bootloader command line is empty.
	 */
	if (IS_ENABLED(CONFIG_CMDLINE_BOOTLOADER) && !boot_command_line[0])
		strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);

out:
	*cmdline_p = boot_command_line;
}

void __init platform_init(void)
{
	arch_reserve_vmcore();
	arch_reserve_crashkernel();

#ifdef CONFIG_ACPI_TABLE_UPGRADE
	acpi_table_upgrade();
#endif
#ifdef CONFIG_ACPI
	acpi_gbl_use_default_register_widths = false;
	acpi_boot_table_init();
#endif

	early_init_fdt_scan_reserved_mem();
	unflatten_and_copy_device_tree();

#ifdef CONFIG_NUMA
	init_numa_memory();
#endif
	dmi_setup();
	smbios_parse();
	pr_info("The BIOS Version: %s\n", b_info.bios_version);

	efi_runtime_init();
}

static void __init check_kernel_sections_mem(void)
{
	phys_addr_t start = __pa_symbol(&_text);
	phys_addr_t size = __pa_symbol(&_end) - start;

	if (!memblock_is_region_memory(start, size)) {
		pr_info("Kernel sections are not in the memory maps\n");
		memblock_add(start, size);
	}
}

/*
 * arch_mem_init - initialize memory management subsystem
 */
static void __init arch_mem_init(char **cmdline_p)
{
	if (usermem)
		pr_info("User-defined physical RAM map overwrite\n");

	check_kernel_sections_mem();

	/*
	 * In order to reduce the possibility of kernel panic when failed to
	 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
	 * low memory as small as possible before swiotlb_init(), so make
	 * sparse_init() using top-down allocation.
	 */
	memblock_set_bottom_up(false);
	sparse_init();
	memblock_set_bottom_up(true);

	swiotlb_init(true, SWIOTLB_VERBOSE);

	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));

	/* Reserve for hibernation. */
	register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
				   PFN_UP(__pa_symbol(&__nosave_end)));

	memblock_dump_all();

	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
}

static void __init resource_init(void)
{
	long i = 0;
	size_t res_size;
	struct resource *res;
	struct memblock_region *region;

	code_resource.start = __pa_symbol(&_text);
	code_resource.end = __pa_symbol(&_etext) - 1;
	data_resource.start = __pa_symbol(&_etext);
	data_resource.end = __pa_symbol(&_edata) - 1;
	bss_resource.start = __pa_symbol(&__bss_start);
	bss_resource.end = __pa_symbol(&__bss_stop) - 1;

	num_standard_resources = memblock.memory.cnt;
	res_size = num_standard_resources * sizeof(*standard_resources);
	standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);

	for_each_mem_region(region) {
		res = &standard_resources[i++];
		if (!memblock_is_nomap(region)) {
			res->name  = "System RAM";
			res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
			res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
			res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
		} else {
			res->name  = "Reserved";
			res->flags = IORESOURCE_MEM;
			res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
			res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
		}

		request_resource(&iomem_resource, res);

		/*
		 *  We don't know which RAM region contains kernel data,
		 *  so we try it repeatedly and let the resource manager
		 *  test it.
		 */
		request_resource(res, &code_resource);
		request_resource(res, &data_resource);
		request_resource(res, &bss_resource);
	}
}

static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
				resource_size_t hw_start, resource_size_t size)
{
	int ret = 0;
	unsigned long vaddr;
	struct logic_pio_hwaddr *range;

	range = kzalloc(sizeof(*range), GFP_ATOMIC);
	if (!range)
		return -ENOMEM;

	range->fwnode = fwnode;
	range->size = size = round_up(size, PAGE_SIZE);
	range->hw_start = hw_start;
	range->flags = LOGIC_PIO_CPU_MMIO;

	ret = logic_pio_register_range(range);
	if (ret) {
		kfree(range);
		return ret;
	}

	/* Legacy ISA must placed at the start of PCI_IOBASE */
	if (range->io_start != 0) {
		logic_pio_unregister_range(range);
		kfree(range);
		return -EINVAL;
	}

	vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
	ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));

	return 0;
}

static __init int arch_reserve_pio_range(void)
{
	struct device_node *np;

	for_each_node_by_name(np, "isa") {
		struct of_range range;
		struct of_range_parser parser;

		pr_info("ISA Bridge: %pOF\n", np);

		if (of_range_parser_init(&parser, np)) {
			pr_info("Failed to parse resources.\n");
			of_node_put(np);
			break;
		}

		for_each_of_range(&parser, &range) {
			switch (range.flags & IORESOURCE_TYPE_BITS) {
			case IORESOURCE_IO:
				pr_info(" IO 0x%016llx..0x%016llx  ->  0x%016llx\n",
					range.cpu_addr,
					range.cpu_addr + range.size - 1,
					range.bus_addr);
				if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
					pr_warn("Failed to reserve legacy IO in Logic PIO\n");
				break;
			case IORESOURCE_MEM:
				pr_info(" MEM 0x%016llx..0x%016llx  ->  0x%016llx\n",
					range.cpu_addr,
					range.cpu_addr + range.size - 1,
					range.bus_addr);
				break;
			}
		}
	}

	return 0;
}
arch_initcall(arch_reserve_pio_range);

static int __init reserve_memblock_reserved_regions(void)
{
	u64 i, j;

	for (i = 0; i < num_standard_resources; ++i) {
		struct resource *mem = &standard_resources[i];
		phys_addr_t r_start, r_end, mem_size = resource_size(mem);

		if (!memblock_is_region_reserved(mem->start, mem_size))
			continue;

		for_each_reserved_mem_range(j, &r_start, &r_end) {
			resource_size_t start, end;

			start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
			end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);

			if (start > mem->end || end < mem->start)
				continue;

			reserve_region_with_split(mem, start, end, "Reserved");
		}
	}

	return 0;
}
arch_initcall(reserve_memblock_reserved_regions);

#ifdef CONFIG_SMP
static void __init prefill_possible_map(void)
{
	int i, possible;

	possible = num_processors + disabled_cpus;
	if (possible > nr_cpu_ids)
		possible = nr_cpu_ids;

	pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
			possible, max((possible - num_processors), 0));

	for (i = 0; i < possible; i++)
		set_cpu_possible(i, true);
	for (; i < NR_CPUS; i++)
		set_cpu_possible(i, false);

	set_nr_cpu_ids(possible);
}
#endif

void __init setup_arch(char **cmdline_p)
{
	cpu_probe();

	init_environ();
	efi_init();
	fdt_setup();
	memblock_init();
	pagetable_init();
	bootcmdline_init(cmdline_p);
	parse_early_param();
	reserve_initrd_mem();

	platform_init();
	arch_mem_init(cmdline_p);

	resource_init();
#ifdef CONFIG_SMP
	plat_smp_setup();
	prefill_possible_map();
#endif

	paging_init();

#ifdef CONFIG_KASAN
	kasan_init();
#endif
}