[linux-block.git] / arch / loongarch / kernel / setup.c

// 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/dmi.h>
#include <linux/efi.h>
#include <linux/export.h>
#include <linux/screen_info.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/bugs.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)

struct screen_info screen_info __section(".data");

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 check_bugs(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
pgprot_t pgprot_wc = PAGE_KERNEL_WUC;
#else
pgprot_t pgprot_wc = PAGE_KERNEL_SUC;
#endif

EXPORT_SYMBOL(pgprot_wc);

static int __init setup_writecombine(char *p)
{
	if (!strcmp(p, "on"))
		pgprot_wc = PAGE_KERNEL_WUC;
	else if (!strcmp(p, "off"))
		pgprot_wc = PAGE_KERNEL_SUC;
	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
}

/* 2MB alignment for crash kernel regions */
#define CRASH_ALIGN	SZ_2M
#define CRASH_ADDR_MAX	SZ_4G

static void __init arch_parse_crashkernel(void)
{
#ifdef CONFIG_KEXEC
	int ret;
	unsigned long long total_mem;
	unsigned long long crash_base, crash_size;

	total_mem = memblock_phys_mem_size();
	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
	if (ret < 0 || crash_size <= 0)
		return;

	if (crash_base <= 0) {
		crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, CRASH_ALIGN, CRASH_ADDR_MAX);
		if (!crash_base) {
			pr_warn("crashkernel reservation failed - No suitable area found.\n");
			return;
		}
	} else if (!memblock_phys_alloc_range(crash_size, CRASH_ALIGN, crash_base, crash_base + crash_size)) {
		pr_warn("Invalid memory region reserved for crash kernel\n");
		return;
	}

	crashk_res.start = crash_base;
	crashk_res.end	 = crash_base + crash_size - 1;
#endif
}

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;

	/* Look for a device tree configuration table entry */
	fdt_pointer = efi_fdt_pointer();
	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);

		strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
	}
#endif

out:
	*cmdline_p = boot_command_line;
}

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

	early_init_fdt_scan_reserved_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);
	}

#ifdef CONFIG_KEXEC
	if (crashk_res.start < crashk_res.end) {
		insert_resource(&iomem_resource, &crashk_res);
		pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
			(unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20),
			(unsigned long)(crashk_res.start  >> 20));
	}
#endif
}

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();
}
Commit	Line	Data
628c3bb4 HC	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
	4	*
	5	* Derived from MIPS:
	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/acpi.h>
	15	#include <linux/dmi.h>
	16	#include <linux/efi.h>
	17	#include <linux/export.h>
	18	#include <linux/screen_info.h>
	19	#include <linux/memblock.h>
	20	#include <linux/initrd.h>
	21	#include <linux/ioport.h>
4e62d1d8 YT	22	#include <linux/kexec.h>
4e62d1d8 YT	23	#include <linux/crash_dump.h>
628c3bb4 HC	24	#include <linux/root_dev.h>
	25	#include <linux/console.h>
	26	#include <linux/pfn.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/sizes.h>
	29	#include <linux/device.h>
	30	#include <linux/dma-map-ops.h>
88d4d957 BZ	31	#include <linux/libfdt.h>
	32	#include <linux/of_fdt.h>
	33	#include <linux/of_address.h>
7db54bfe	34	#include <linux/suspend.h>
628c3bb4 HC	35	#include <linux/swiotlb.h>
	36
	37	#include <asm/addrspace.h>
19e5eb15	38	#include <asm/alternative.h>
628c3bb4	39	#include <asm/bootinfo.h>
19e5eb15	40	#include <asm/bugs.h>
628c3bb4 HC	41	#include <asm/cache.h>
	42	#include <asm/cpu.h>
	43	#include <asm/dma.h>
	44	#include <asm/efi.h>
	45	#include <asm/loongson.h>
d4b6f156	46	#include <asm/numa.h>
628c3bb4 HC	47	#include <asm/pgalloc.h>
	48	#include <asm/sections.h>
	49	#include <asm/setup.h>
	50	#include <asm/time.h>
	51
	52	#define SMBIOS_BIOSSIZE_OFFSET 0x09
	53	#define SMBIOS_BIOSEXTERN_OFFSET 0x13
	54	#define SMBIOS_FREQLOW_OFFSET 0x16
	55	#define SMBIOS_FREQHIGH_OFFSET 0x17
	56	#define SMBIOS_FREQLOW_MASK 0xFF
	57	#define SMBIOS_CORE_PACKAGE_OFFSET 0x23
	58	#define LOONGSON_EFI_ENABLE (1 << 3)
	59
ead384d9	60	struct screen_info screen_info __section(".data");
628c3bb4	61
40cd01a9	62	unsigned long fw_arg0, fw_arg1, fw_arg2;
628c3bb4 HC	63	DEFINE_PER_CPU(unsigned long, kernelsp);
	64	struct cpuinfo_loongarch cpu_data[NR_CPUS] __read_mostly;
	65
	66	EXPORT_SYMBOL(cpu_data);
	67
	68	struct loongson_board_info b_info;
	69	static const char dmi_empty_string[] = " ";
	70
	71	/*
	72	* Setup information
	73	*
	74	* These are initialized so they are in the .data section
	75	*/
88d4d957	76	char init_command_line[COMMAND_LINE_SIZE] __initdata;
628c3bb4 HC	77
	78	static int num_standard_resources;
	79	static struct resource *standard_resources;
	80
	81	static struct resource code_resource = { .name = "Kernel code", };
	82	static struct resource data_resource = { .name = "Kernel data", };
	83	static struct resource bss_resource = { .name = "Kernel bss", };
	84
	85	const char *get_system_type(void)
	86	{
	87	return "generic-loongson-machine";
	88	}
	89
19e5eb15 HC	90	void __init check_bugs(void)
	91	{
	92	alternative_instructions();
	93	}
	94
628c3bb4 HC	95	static const char dmi_string_parse(const struct dmi_header dm, u8 s)
	96	{
	97	const u8 bp = ((u8 ) dm) + dm->length;
	98
	99	if (s) {
	100	s--;
	101	while (s > 0 && *bp) {
	102	bp += strlen(bp) + 1;
	103	s--;
	104	}
	105
	106	if (*bp != 0) {
	107	size_t len = strlen(bp)+1;
	108	size_t cmp_len = len > 8 ? 8 : len;
	109
	110	if (!memcmp(bp, dmi_empty_string, cmp_len))
	111	return dmi_empty_string;
	112
	113	return bp;
	114	}
	115	}
	116
	117	return "";
	118	}
	119
	120	static void __init parse_cpu_table(const struct dmi_header *dm)
	121	{
	122	long freq_temp = 0;
	123	char dmi_data = (char )dm;
	124
	125	freq_temp = ((*(dmi_data + SMBIOS_FREQHIGH_OFFSET) << 8) +
	126	((*(dmi_data + SMBIOS_FREQLOW_OFFSET)) & SMBIOS_FREQLOW_MASK));
	127	cpu_clock_freq = freq_temp * 1000000;
	128
	129	loongson_sysconf.cpuname = (void *)dmi_string_parse(dm, dmi_data[16]);
	130	loongson_sysconf.cores_per_package = *(dmi_data + SMBIOS_CORE_PACKAGE_OFFSET);
	131
	132	pr_info("CpuClock = %llu\n", cpu_clock_freq);
	133	}
	134
	135	static void __init parse_bios_table(const struct dmi_header *dm)
	136	{
628c3bb4 HC	137	char dmi_data = (char )dm;
628c3bb4 HC	138
45b53c90	139	b_info.bios_size = (*(dmi_data + SMBIOS_BIOSSIZE_OFFSET) + 1) << 6;
628c3bb4 HC	140	}
	141
	142	static void __init find_tokens(const struct dmi_header dm, void dummy)
	143	{
	144	switch (dm->type) {
	145	case 0x0: /* Extern BIOS */
	146	parse_bios_table(dm);
	147	break;
	148	case 0x4: /* Calling interface */
	149	parse_cpu_table(dm);
	150	break;
	151	}
	152	}
	153	static void __init smbios_parse(void)
	154	{
	155	b_info.bios_vendor = (void *)dmi_get_system_info(DMI_BIOS_VENDOR);
	156	b_info.bios_version = (void *)dmi_get_system_info(DMI_BIOS_VERSION);
	157	b_info.bios_release_date = (void *)dmi_get_system_info(DMI_BIOS_DATE);
	158	b_info.board_vendor = (void *)dmi_get_system_info(DMI_BOARD_VENDOR);
	159	b_info.board_name = (void *)dmi_get_system_info(DMI_BOARD_NAME);
	160	dmi_walk(find_tokens, NULL);
	161	}
	162
16c52e50 HC	163	#ifdef CONFIG_ARCH_WRITECOMBINE
	164	pgprot_t pgprot_wc = PAGE_KERNEL_WUC;
	165	#else
	166	pgprot_t pgprot_wc = PAGE_KERNEL_SUC;
	167	#endif
	168
	169	EXPORT_SYMBOL(pgprot_wc);
	170
	171	static int __init setup_writecombine(char *p)
	172	{
	173	if (!strcmp(p, "on"))
	174	pgprot_wc = PAGE_KERNEL_WUC;
	175	else if (!strcmp(p, "off"))
	176	pgprot_wc = PAGE_KERNEL_SUC;
	177	else
	178	pr_warn("Unknown writecombine setting \"%s\".\n", p);
	179
	180	return 0;
	181	}
	182	early_param("writecombine", setup_writecombine);
	183
628c3bb4 HC	184	static int usermem __initdata;
	185
	186	static int __init early_parse_mem(char *p)
	187	{
	188	phys_addr_t start, size;
	189
	190	if (!p) {
	191	pr_err("mem parameter is empty, do nothing\n");
	192	return -EINVAL;
	193	}
	194
	195	/*
	196	* If a user specifies memory size, we
	197	* blow away any automatically generated
	198	* size.
	199	*/
	200	if (usermem == 0) {
	201	usermem = 1;
	202	memblock_remove(memblock_start_of_DRAM(),
	203	memblock_end_of_DRAM() - memblock_start_of_DRAM());
	204	}
	205	start = 0;
	206	size = memparse(p, &p);
	207	if (*p == '@')
	208	start = memparse(p + 1, &p);
	209	else {
	210	pr_err("Invalid format!\n");
	211	return -EINVAL;
	212	}
	213
d4b6f156 HC	214	if (!IS_ENABLED(CONFIG_NUMA))
	215	memblock_add(start, size);
	216	else
	217	memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
628c3bb4 HC	218
	219	return 0;
	220	}
	221	early_param("mem", early_parse_mem);
	222
4e62d1d8 YT	223	static void __init arch_reserve_vmcore(void)
	224	{
	225	#ifdef CONFIG_PROC_VMCORE
	226	u64 i;
	227	phys_addr_t start, end;
	228
	229	if (!is_kdump_kernel())
	230	return;
	231
	232	if (!elfcorehdr_size) {
	233	for_each_mem_range(i, &start, &end) {
	234	if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
	235	/*
	236	* Reserve from the elf core header to the end of
	237	* the memory segment, that should all be kdump
	238	* reserved memory.
	239	*/
	240	elfcorehdr_size = end - elfcorehdr_addr;
	241	break;
	242	}
	243	}
	244	}
	245
	246	if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
	247	pr_warn("elfcorehdr is overlapped\n");
	248	return;
	249	}
	250
	251	memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
	252
	253	pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
	254	elfcorehdr_size >> 10, elfcorehdr_addr);
	255	#endif
	256	}
	257
35c94fab YT	258	/* 2MB alignment for crash kernel regions */
	259	#define CRASH_ALIGN SZ_2M
	260	#define CRASH_ADDR_MAX SZ_4G
	261
4e62d1d8 YT	262	static void __init arch_parse_crashkernel(void)
	263	{
	264	#ifdef CONFIG_KEXEC
	265	int ret;
4e62d1d8 YT	266	unsigned long long total_mem;
	267	unsigned long long crash_base, crash_size;
	268
	269	total_mem = memblock_phys_mem_size();
	270	ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
	271	if (ret < 0 \|\| crash_size <= 0)
	272	return;
	273
35c94fab YT	274	if (crash_base <= 0) {
	275	crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, CRASH_ALIGN, CRASH_ADDR_MAX);
	276	if (!crash_base) {
	277	pr_warn("crashkernel reservation failed - No suitable area found.\n");
	278	return;
	279	}
	280	} else if (!memblock_phys_alloc_range(crash_size, CRASH_ALIGN, crash_base, crash_base + crash_size)) {
4e62d1d8 YT	281	pr_warn("Invalid memory region reserved for crash kernel\n");
	282	return;
	283	}
	284
	285	crashk_res.start = crash_base;
	286	crashk_res.end = crash_base + crash_size - 1;
	287	#endif
	288	}
	289
88d4d957 BZ	290	static void __init fdt_setup(void)
	291	{
	292	#ifdef CONFIG_OF_EARLY_FLATTREE
	293	void *fdt_pointer;
	294
	295	/* ACPI-based systems do not require parsing fdt */
	296	if (acpi_os_get_root_pointer())
	297	return;
	298
	299	/* Look for a device tree configuration table entry */
	300	fdt_pointer = efi_fdt_pointer();
	301	if (!fdt_pointer \|\| fdt_check_header(fdt_pointer))
	302	return;
	303
	304	early_init_dt_scan(fdt_pointer);
	305	early_init_fdt_reserve_self();
	306
	307	max_low_pfn = PFN_PHYS(memblock_end_of_DRAM());
	308	#endif
	309	}
	310
	311	static void __init bootcmdline_init(char **cmdline_p)
	312	{
	313	/*
	314	* If CONFIG_CMDLINE_FORCE is enabled then initializing the command line
	315	* is trivial - we simply use the built-in command line unconditionally &
	316	* unmodified.
	317	*/
	318	if (IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
	319	strscpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
	320	goto out;
	321	}
	322
	323	#ifdef CONFIG_OF_FLATTREE
	324	/*
	325	* If CONFIG_CMDLINE_BOOTLOADER is enabled and we are in FDT-based system,
	326	* the boot_command_line will be overwritten by early_init_dt_scan_chosen().
	327	* So we need to append init_command_line (the original copy of boot_command_line)
	328	* to boot_command_line.
	329	*/
	330	if (initial_boot_params) {
	331	if (boot_command_line[0])
	332	strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
	333
	334	strlcat(boot_command_line, init_command_line, COMMAND_LINE_SIZE);
	335	}
	336	#endif
	337
	338	out:
	339	*cmdline_p = boot_command_line;
	340	}
	341
628c3bb4 HC	342	void __init platform_init(void)
628c3bb4 HC	343	{
4e62d1d8 YT	344	arch_reserve_vmcore();
	345	arch_parse_crashkernel();
	346
628c3bb4 HC	347	#ifdef CONFIG_ACPI_TABLE_UPGRADE
	348	acpi_table_upgrade();
	349	#endif
	350	#ifdef CONFIG_ACPI
	351	acpi_gbl_use_default_register_widths = false;
	352	acpi_boot_table_init();
628c3bb4	353	#endif
88d4d957	354	unflatten_and_copy_device_tree();
628c3bb4	355
d4b6f156 HC	356	#ifdef CONFIG_NUMA
	357	init_numa_memory();
	358	#endif
628c3bb4 HC	359	dmi_setup();
	360	smbios_parse();
	361	pr_info("The BIOS Version: %s\n", b_info.bios_version);
	362
	363	efi_runtime_init();
	364	}
	365
	366	static void __init check_kernel_sections_mem(void)
	367	{
	368	phys_addr_t start = __pa_symbol(&_text);
	369	phys_addr_t size = __pa_symbol(&_end) - start;
	370
	371	if (!memblock_is_region_memory(start, size)) {
	372	pr_info("Kernel sections are not in the memory maps\n");
	373	memblock_add(start, size);
	374	}
	375	}
	376
	377	/*
	378	* arch_mem_init - initialize memory management subsystem
	379	*/
	380	static void __init arch_mem_init(char **cmdline_p)
	381	{
	382	if (usermem)
	383	pr_info("User-defined physical RAM map overwrite\n");
	384
	385	check_kernel_sections_mem();
	386
88d4d957 BZ	387	early_init_fdt_scan_reserved_mem();
88d4d957 BZ	388
628c3bb4 HC	389	/*
	390	* In order to reduce the possibility of kernel panic when failed to
	391	* get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
afca6e06 TY	392	* low memory as small as possible before swiotlb_init(), so make
afca6e06 TY	393	* sparse_init() using top-down allocation.
628c3bb4 HC	394	*/
	395	memblock_set_bottom_up(false);
	396	sparse_init();
	397	memblock_set_bottom_up(true);
	398
c78c43fe	399	swiotlb_init(true, SWIOTLB_VERBOSE);
628c3bb4 HC	400
	401	dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
	402
7db54bfe HC	403	/* Reserve for hibernation. */
	404	register_nosave_region(PFN_DOWN(__pa_symbol(&__nosave_begin)),
	405	PFN_UP(__pa_symbol(&__nosave_end)));
	406
628c3bb4 HC	407	memblock_dump_all();
	408
	409	early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
	410	}
	411
	412	static void __init resource_init(void)
	413	{
	414	long i = 0;
	415	size_t res_size;
	416	struct resource *res;
	417	struct memblock_region *region;
	418
	419	code_resource.start = __pa_symbol(&_text);
	420	code_resource.end = __pa_symbol(&_etext) - 1;
	421	data_resource.start = __pa_symbol(&_etext);
	422	data_resource.end = __pa_symbol(&_edata) - 1;
	423	bss_resource.start = __pa_symbol(&__bss_start);
	424	bss_resource.end = __pa_symbol(&__bss_stop) - 1;
	425
	426	num_standard_resources = memblock.memory.cnt;
	427	res_size = num_standard_resources * sizeof(*standard_resources);
	428	standard_resources = memblock_alloc(res_size, SMP_CACHE_BYTES);
	429
	430	for_each_mem_region(region) {
	431	res = &standard_resources[i++];
	432	if (!memblock_is_nomap(region)) {
	433	res->name = "System RAM";
	434	res->flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	435	res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
	436	res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
	437	} else {
	438	res->name = "Reserved";
	439	res->flags = IORESOURCE_MEM;
	440	res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
	441	res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
	442	}
	443
	444	request_resource(&iomem_resource, res);
	445
	446	/*
	447	* We don't know which RAM region contains kernel data,
	448	* so we try it repeatedly and let the resource manager
	449	* test it.
	450	*/
	451	request_resource(res, &code_resource);
	452	request_resource(res, &data_resource);
	453	request_resource(res, &bss_resource);
	454	}
4e62d1d8 YT	455
	456	#ifdef CONFIG_KEXEC
	457	if (crashk_res.start < crashk_res.end) {
	458	insert_resource(&iomem_resource, &crashk_res);
	459	pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
	460	(unsigned long)((crashk_res.end - crashk_res.start + 1) >> 20),
	461	(unsigned long)(crashk_res.start >> 20));
	462	}
	463	#endif
628c3bb4 HC	464	}
628c3bb4 HC	465
27cab431 BZ	466	static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
	467	resource_size_t hw_start, resource_size_t size)
	468	{
	469	int ret = 0;
	470	unsigned long vaddr;
	471	struct logic_pio_hwaddr *range;
	472
	473	range = kzalloc(sizeof(*range), GFP_ATOMIC);
	474	if (!range)
	475	return -ENOMEM;
	476
	477	range->fwnode = fwnode;
	478	range->size = size = round_up(size, PAGE_SIZE);
	479	range->hw_start = hw_start;
	480	range->flags = LOGIC_PIO_CPU_MMIO;
	481
	482	ret = logic_pio_register_range(range);
	483	if (ret) {
	484	kfree(range);
	485	return ret;
	486	}
	487
	488	/* Legacy ISA must placed at the start of PCI_IOBASE */
	489	if (range->io_start != 0) {
	490	logic_pio_unregister_range(range);
	491	kfree(range);
	492	return -EINVAL;
	493	}
	494
	495	vaddr = (unsigned long)(PCI_IOBASE + range->io_start);
	496	ioremap_page_range(vaddr, vaddr + size, hw_start, pgprot_device(PAGE_KERNEL));
	497
	498	return 0;
	499	}
	500
	501	static __init int arch_reserve_pio_range(void)
	502	{
	503	struct device_node *np;
	504
	505	for_each_node_by_name(np, "isa") {
	506	struct of_range range;
	507	struct of_range_parser parser;
	508
	509	pr_info("ISA Bridge: %pOF\n", np);
	510
	511	if (of_range_parser_init(&parser, np)) {
	512	pr_info("Failed to parse resources.\n");
	513	of_node_put(np);
	514	break;
	515	}
	516
	517	for_each_of_range(&parser, &range) {
	518	switch (range.flags & IORESOURCE_TYPE_BITS) {
	519	case IORESOURCE_IO:
	520	pr_info(" IO 0x%016llx..0x%016llx -> 0x%016llx\n",
	521	range.cpu_addr,
	522	range.cpu_addr + range.size - 1,
	523	range.bus_addr);
	524	if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
	525	pr_warn("Failed to reserve legacy IO in Logic PIO\n");
	526	break;
	527	case IORESOURCE_MEM:
	528	pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx\n",
	529	range.cpu_addr,
530	range.cpu_addr + range.size - 1,
531	range.bus_addr);
532	break;
533	}
534	}
535	}
536
537	return 0;
538	}
539	arch_initcall(arch_reserve_pio_range);
540
628c3bb4 HC	541	static int __init reserve_memblock_reserved_regions(void)
	542	{
	543	u64 i, j;
	544
	545	for (i = 0; i < num_standard_resources; ++i) {
	546	struct resource *mem = &standard_resources[i];
	547	phys_addr_t r_start, r_end, mem_size = resource_size(mem);
	548
	549	if (!memblock_is_region_reserved(mem->start, mem_size))
	550	continue;
	551
	552	for_each_reserved_mem_range(j, &r_start, &r_end) {
	553	resource_size_t start, end;
	554
	555	start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
	556	end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
	557
	558	if (start > mem->end \|\| end < mem->start)
	559	continue;
	560
	561	reserve_region_with_split(mem, start, end, "Reserved");
	562	}
	563	}
	564
	565	return 0;
	566	}
	567	arch_initcall(reserve_memblock_reserved_regions);
	568
46859ac8 HC	569	#ifdef CONFIG_SMP
	570	static void __init prefill_possible_map(void)
	571	{
	572	int i, possible;
	573
	574	possible = num_processors + disabled_cpus;
	575	if (possible > nr_cpu_ids)
	576	possible = nr_cpu_ids;
	577
	578	pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
	579	possible, max((possible - num_processors), 0));
	580
	581	for (i = 0; i < possible; i++)
	582	set_cpu_possible(i, true);
	583	for (; i < NR_CPUS; i++)
	584	set_cpu_possible(i, false);
	585
38bef8e5	586	set_nr_cpu_ids(possible);
46859ac8	587	}
46859ac8 HC	588	#endif
46859ac8 HC	589
628c3bb4 HC	590	void __init setup_arch(char **cmdline_p)
	591	{
	592	cpu_probe();
628c3bb4 HC	593
628c3bb4 HC	594	init_environ();
40cd01a9	595	efi_init();
88d4d957	596	fdt_setup();
628c3bb4	597	memblock_init();
d2791341	598	pagetable_init();
88d4d957	599	bootcmdline_init(cmdline_p);
628c3bb4	600	parse_early_param();
4e62d1d8	601	reserve_initrd_mem();
628c3bb4 HC	602
628c3bb4 HC	603	platform_init();
628c3bb4 HC	604	arch_mem_init(cmdline_p);
	605
	606	resource_init();
255b4658	607	#ifdef CONFIG_SMP
46859ac8 HC	608	plat_smp_setup();
46859ac8 HC	609	prefill_possible_map();
255b4658	610	#endif
628c3bb4 HC	611
	612	paging_init();
	613	}