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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 * Copyright (C) 2020 FORTH-ICS/CARV
 *  Nick Kossifidis <mick@ics.forth.gr>
 */

#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/sched.h>
#include <linux/console.h>
#include <linux/of_fdt.h>
#include <linux/sched/task.h>
#include <linux/smp.h>
#include <linux/efi.h>
#include <linux/crash_dump.h>
#include <linux/panic_notifier.h>

#include <asm/acpi.h>
#include <asm/alternative.h>
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/early_ioremap.h>
#include <asm/pgtable.h>
#include <asm/setup.h>
#include <asm/set_memory.h>
#include <asm/sections.h>
#include <asm/sbi.h>
#include <asm/tlbflush.h>
#include <asm/thread_info.h>
#include <asm/kasan.h>
#include <asm/efi.h>

#include "head.h"

/*
 * The lucky hart to first increment this variable will boot the other cores.
 * This is used before the kernel initializes the BSS so it can't be in the
 * BSS.
 */
atomic_t hart_lottery __section(".sdata")
#ifdef CONFIG_XIP_KERNEL
= ATOMIC_INIT(0xC001BEEF)
#endif
;
unsigned long boot_cpu_hartid;
EXPORT_SYMBOL_GPL(boot_cpu_hartid);

/*
 * Place kernel memory regions on the resource tree so that
 * kexec-tools can retrieve them from /proc/iomem. While there
 * also add "System RAM" regions for compatibility with other
 * archs, and the rest of the known regions for completeness.
 */
static struct resource kimage_res = { .name = "Kernel image", };
static struct resource code_res = { .name = "Kernel code", };
static struct resource data_res = { .name = "Kernel data", };
static struct resource rodata_res = { .name = "Kernel rodata", };
static struct resource bss_res = { .name = "Kernel bss", };
#ifdef CONFIG_CRASH_DUMP
static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
#endif

static int num_standard_resources;
static struct resource *standard_resources;

static int __init add_resource(struct resource *parent,
				struct resource *res)
{
	int ret = 0;

	ret = insert_resource(parent, res);
	if (ret < 0) {
		pr_err("Failed to add a %s resource at %llx\n",
			res->name, (unsigned long long) res->start);
		return ret;
	}

	return 1;
}

static int __init add_kernel_resources(void)
{
	int ret = 0;

	/*
	 * The memory region of the kernel image is continuous and
	 * was reserved on setup_bootmem, register it here as a
	 * resource, with the various segments of the image as
	 * child nodes.
	 */

	code_res.start = __pa_symbol(_text);
	code_res.end = __pa_symbol(_etext) - 1;
	code_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

	rodata_res.start = __pa_symbol(__start_rodata);
	rodata_res.end = __pa_symbol(__end_rodata) - 1;
	rodata_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

	data_res.start = __pa_symbol(_data);
	data_res.end = __pa_symbol(_edata) - 1;
	data_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

	bss_res.start = __pa_symbol(__bss_start);
	bss_res.end = __pa_symbol(__bss_stop) - 1;
	bss_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

	kimage_res.start = code_res.start;
	kimage_res.end = bss_res.end;
	kimage_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;

	ret = add_resource(&iomem_resource, &kimage_res);
	if (ret < 0)
		return ret;

	ret = add_resource(&kimage_res, &code_res);
	if (ret < 0)
		return ret;

	ret = add_resource(&kimage_res, &rodata_res);
	if (ret < 0)
		return ret;

	ret = add_resource(&kimage_res, &data_res);
	if (ret < 0)
		return ret;

	ret = add_resource(&kimage_res, &bss_res);

	return ret;
}

static void __init init_resources(void)
{
	struct memblock_region *region = NULL;
	struct resource *res = NULL;
	struct resource *mem_res = NULL;
	size_t mem_res_sz = 0;
	int num_resources = 0, res_idx = 0, non_resv_res = 0;
	int ret = 0;

	/* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
	num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
	res_idx = num_resources - 1;

	mem_res_sz = num_resources * sizeof(*mem_res);
	mem_res = memblock_alloc_or_panic(mem_res_sz, SMP_CACHE_BYTES);

	/*
	 * Start by adding the reserved regions, if they overlap
	 * with /memory regions, insert_resource later on will take
	 * care of it.
	 */
	ret = add_kernel_resources();
	if (ret < 0)
		goto error;

#ifdef CONFIG_CRASH_DUMP
	if (elfcorehdr_size > 0) {
		elfcorehdr_res.start = elfcorehdr_addr;
		elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
		elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
		add_resource(&iomem_resource, &elfcorehdr_res);
	}
#endif

	for_each_reserved_mem_region(region) {
		res = &mem_res[res_idx--];

		res->name = "Reserved";
		res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
		res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
		res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;

		/*
		 * Ignore any other reserved regions within
		 * system memory.
		 */
		if (memblock_is_memory(res->start)) {
			/* Re-use this pre-allocated resource */
			res_idx++;
			continue;
		}

		ret = add_resource(&iomem_resource, res);
		if (ret < 0)
			goto error;
	}

	/* Add /memory regions to the resource tree */
	for_each_mem_region(region) {
		res = &mem_res[res_idx--];
		non_resv_res++;

		if (unlikely(memblock_is_nomap(region))) {
			res->name = "Reserved";
			res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
		} else {
			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;

		ret = add_resource(&iomem_resource, res);
		if (ret < 0)
			goto error;
	}

	num_standard_resources = non_resv_res;
	standard_resources = &mem_res[res_idx + 1];

	/* Clean-up any unused pre-allocated resources */
	if (res_idx >= 0)
		memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
	return;

 error:
	/* Better an empty resource tree than an inconsistent one */
	release_child_resources(&iomem_resource);
	memblock_free(mem_res, mem_res_sz);
}

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);

static void __init parse_dtb(void)
{
	/* Early scan of device tree from init memory */
	if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
		const char *name = of_flat_dt_get_machine_name();

		if (name) {
			pr_info("Machine model: %s\n", name);
			dump_stack_set_arch_desc("%s (DT)", name);
		}
	} else {
		pr_err("No DTB passed to the kernel\n");
	}
}

#if defined(CONFIG_RISCV_COMBO_SPINLOCKS)
DEFINE_STATIC_KEY_TRUE(qspinlock_key);
EXPORT_SYMBOL(qspinlock_key);
#endif

static void __init riscv_spinlock_init(void)
{
	char *using_ext = NULL;

	if (IS_ENABLED(CONFIG_RISCV_TICKET_SPINLOCKS)) {
		pr_info("Ticket spinlock: enabled\n");
		return;
	}

	if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) &&
	    IS_ENABLED(CONFIG_RISCV_ISA_ZACAS) &&
	    riscv_isa_extension_available(NULL, ZABHA) &&
	    riscv_isa_extension_available(NULL, ZACAS)) {
		using_ext = "using Zabha";
	} else if (riscv_isa_extension_available(NULL, ZICCRSE)) {
		using_ext = "using Ziccrse";
	}
#if defined(CONFIG_RISCV_COMBO_SPINLOCKS)
	else {
		static_branch_disable(&qspinlock_key);
		pr_info("Ticket spinlock: enabled\n");
		return;
	}
#endif

	if (!using_ext)
		pr_err("Queued spinlock without Zabha or Ziccrse");
	else
		pr_info("Queued spinlock %s: enabled\n", using_ext);
}

extern void __init init_rt_signal_env(void);

void __init setup_arch(char **cmdline_p)
{
	parse_dtb();
	setup_initial_init_mm(_stext, _etext, _edata, _end);

	*cmdline_p = boot_command_line;

	early_ioremap_setup();
	sbi_init();
	jump_label_init();
	parse_early_param();

	efi_init();
	paging_init();

	/* Parse the ACPI tables for possible boot-time configuration */
	acpi_boot_table_init();

#if IS_ENABLED(CONFIG_BUILTIN_DTB)
	unflatten_and_copy_device_tree();
#else
	unflatten_device_tree();
#endif
	misc_mem_init();

	init_resources();

#ifdef CONFIG_KASAN
	kasan_init();
#endif

#ifdef CONFIG_SMP
	setup_smp();
#endif

	if (!acpi_disabled) {
		acpi_init_rintc_map();
		acpi_map_cpus_to_nodes();
	}

	riscv_init_cbo_blocksizes();
	riscv_fill_hwcap();
	apply_boot_alternatives();
	init_rt_signal_env();

	if (IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM) &&
	    riscv_isa_extension_available(NULL, ZICBOM))
		riscv_noncoherent_supported();
	riscv_set_dma_cache_alignment();

	riscv_user_isa_enable();
	riscv_spinlock_init();
}

bool arch_cpu_is_hotpluggable(int cpu)
{
	return cpu_has_hotplug(cpu);
}

void free_initmem(void)
{
	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
		set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx);
		if (IS_ENABLED(CONFIG_64BIT))
			set_kernel_memory(__init_begin, __init_end, set_memory_nx);
	}

	free_initmem_default(POISON_FREE_INITMEM);
}

static int dump_kernel_offset(struct notifier_block *self,
			      unsigned long v, void *p)
{
	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
		 kernel_map.virt_offset,
		 KERNEL_LINK_ADDR);

	return 0;
}

static struct notifier_block kernel_offset_notifier = {
	.notifier_call = dump_kernel_offset
};

static int __init register_kernel_offset_dumper(void)
{
	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
		atomic_notifier_chain_register(&panic_notifier_list,
					       &kernel_offset_notifier);

	return 0;
}
device_initcall(register_kernel_offset_dumper);
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
	4	* Chen Liqin <liqin.chen@sunplusct.com>
	5	* Lennox Wu <lennox.wu@sunplusct.com>
	6	* Copyright (C) 2012 Regents of the University of California
	7	* Copyright (C) 2020 FORTH-ICS/CARV
	8	* Nick Kossifidis <mick@ics.forth.gr>
	9	*/
	10
	11	#include <linux/acpi.h>
	12	#include <linux/cpu.h>
	13	#include <linux/init.h>
	14	#include <linux/mm.h>
	15	#include <linux/memblock.h>
	16	#include <linux/sched.h>
	17	#include <linux/console.h>
	18	#include <linux/of_fdt.h>
	19	#include <linux/sched/task.h>
	20	#include <linux/smp.h>
	21	#include <linux/efi.h>
	22	#include <linux/crash_dump.h>
	23	#include <linux/panic_notifier.h>
	24
	25	#include <asm/acpi.h>
	26	#include <asm/alternative.h>
	27	#include <asm/cacheflush.h>
	28	#include <asm/cpufeature.h>
	29	#include <asm/early_ioremap.h>
	30	#include <asm/pgtable.h>
	31	#include <asm/setup.h>
	32	#include <asm/set_memory.h>
	33	#include <asm/sections.h>
	34	#include <asm/sbi.h>
	35	#include <asm/tlbflush.h>
	36	#include <asm/thread_info.h>
	37	#include <asm/kasan.h>
	38	#include <asm/efi.h>
	39
	40	#include "head.h"
	41
	42	/*
	43	* The lucky hart to first increment this variable will boot the other cores.
	44	* This is used before the kernel initializes the BSS so it can't be in the
	45	* BSS.
	46	*/
	47	atomic_t hart_lottery __section(".sdata")
	48	#ifdef CONFIG_XIP_KERNEL
	49	= ATOMIC_INIT(0xC001BEEF)
	50	#endif
	51	;
	52	unsigned long boot_cpu_hartid;
	53	EXPORT_SYMBOL_GPL(boot_cpu_hartid);
	54
	55	/*
	56	* Place kernel memory regions on the resource tree so that
	57	* kexec-tools can retrieve them from /proc/iomem. While there
	58	* also add "System RAM" regions for compatibility with other
	59	* archs, and the rest of the known regions for completeness.
	60	*/
	61	static struct resource kimage_res = { .name = "Kernel image", };
	62	static struct resource code_res = { .name = "Kernel code", };
	63	static struct resource data_res = { .name = "Kernel data", };
	64	static struct resource rodata_res = { .name = "Kernel rodata", };
	65	static struct resource bss_res = { .name = "Kernel bss", };
	66	#ifdef CONFIG_CRASH_DUMP
	67	static struct resource elfcorehdr_res = { .name = "ELF Core hdr", };
	68	#endif
	69
	70	static int num_standard_resources;
	71	static struct resource *standard_resources;
	72
	73	static int __init add_resource(struct resource *parent,
	74	struct resource *res)
	75	{
	76	int ret = 0;
	77
	78	ret = insert_resource(parent, res);
	79	if (ret < 0) {
	80	pr_err("Failed to add a %s resource at %llx\n",
	81	res->name, (unsigned long long) res->start);
	82	return ret;
	83	}
	84
	85	return 1;
	86	}
	87
	88	static int __init add_kernel_resources(void)
	89	{
	90	int ret = 0;
	91
	92	/*
	93	* The memory region of the kernel image is continuous and
	94	* was reserved on setup_bootmem, register it here as a
	95	* resource, with the various segments of the image as
	96	* child nodes.
	97	*/
	98
	99	code_res.start = __pa_symbol(_text);
	100	code_res.end = __pa_symbol(_etext) - 1;
	101	code_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	102
	103	rodata_res.start = __pa_symbol(__start_rodata);
	104	rodata_res.end = __pa_symbol(__end_rodata) - 1;
	105	rodata_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	106
	107	data_res.start = __pa_symbol(_data);
	108	data_res.end = __pa_symbol(_edata) - 1;
	109	data_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	110
	111	bss_res.start = __pa_symbol(__bss_start);
	112	bss_res.end = __pa_symbol(__bss_stop) - 1;
	113	bss_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	114
	115	kimage_res.start = code_res.start;
	116	kimage_res.end = bss_res.end;
	117	kimage_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	118
	119	ret = add_resource(&iomem_resource, &kimage_res);
	120	if (ret < 0)
	121	return ret;
	122
	123	ret = add_resource(&kimage_res, &code_res);
	124	if (ret < 0)
	125	return ret;
	126
	127	ret = add_resource(&kimage_res, &rodata_res);
	128	if (ret < 0)
	129	return ret;
	130
	131	ret = add_resource(&kimage_res, &data_res);
	132	if (ret < 0)
	133	return ret;
	134
	135	ret = add_resource(&kimage_res, &bss_res);
	136
	137	return ret;
	138	}
	139
	140	static void __init init_resources(void)
	141	{
	142	struct memblock_region *region = NULL;
	143	struct resource *res = NULL;
	144	struct resource *mem_res = NULL;
	145	size_t mem_res_sz = 0;
	146	int num_resources = 0, res_idx = 0, non_resv_res = 0;
	147	int ret = 0;
	148
	149	/* + 1 as memblock_alloc() might increase memblock.reserved.cnt */
	150	num_resources = memblock.memory.cnt + memblock.reserved.cnt + 1;
	151	res_idx = num_resources - 1;
	152
	153	mem_res_sz = num_resources * sizeof(*mem_res);
	154	mem_res = memblock_alloc_or_panic(mem_res_sz, SMP_CACHE_BYTES);
	155
	156	/*
	157	* Start by adding the reserved regions, if they overlap
	158	* with /memory regions, insert_resource later on will take
	159	* care of it.
	160	*/
	161	ret = add_kernel_resources();
	162	if (ret < 0)
	163	goto error;
	164
	165	#ifdef CONFIG_CRASH_DUMP
	166	if (elfcorehdr_size > 0) {
	167	elfcorehdr_res.start = elfcorehdr_addr;
	168	elfcorehdr_res.end = elfcorehdr_addr + elfcorehdr_size - 1;
	169	elfcorehdr_res.flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	170	add_resource(&iomem_resource, &elfcorehdr_res);
	171	}
	172	#endif
	173
	174	for_each_reserved_mem_region(region) {
	175	res = &mem_res[res_idx--];
	176
	177	res->name = "Reserved";
	178	res->flags = IORESOURCE_MEM \| IORESOURCE_EXCLUSIVE;
	179	res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
	180	res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
	181
	182	/*
	183	* Ignore any other reserved regions within
	184	* system memory.
	185	*/
	186	if (memblock_is_memory(res->start)) {
	187	/* Re-use this pre-allocated resource */
	188	res_idx++;
	189	continue;
	190	}
	191
	192	ret = add_resource(&iomem_resource, res);
	193	if (ret < 0)
	194	goto error;
	195	}
	196
	197	/* Add /memory regions to the resource tree */
	198	for_each_mem_region(region) {
	199	res = &mem_res[res_idx--];
	200	non_resv_res++;
	201
	202	if (unlikely(memblock_is_nomap(region))) {
	203	res->name = "Reserved";
	204	res->flags = IORESOURCE_MEM \| IORESOURCE_EXCLUSIVE;
	205	} else {
	206	res->name = "System RAM";
	207	res->flags = IORESOURCE_SYSTEM_RAM \| IORESOURCE_BUSY;
	208	}
	209
	210	res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
	211	res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
	212
	213	ret = add_resource(&iomem_resource, res);
	214	if (ret < 0)
	215	goto error;
	216	}
	217
	218	num_standard_resources = non_resv_res;
	219	standard_resources = &mem_res[res_idx + 1];
	220
	221	/* Clean-up any unused pre-allocated resources */
	222	if (res_idx >= 0)
	223	memblock_free(mem_res, (res_idx + 1) * sizeof(*mem_res));
	224	return;
	225
	226	error:
	227	/* Better an empty resource tree than an inconsistent one */
	228	release_child_resources(&iomem_resource);
	229	memblock_free(mem_res, mem_res_sz);
	230	}
	231
	232	static int __init reserve_memblock_reserved_regions(void)
	233	{
	234	u64 i, j;
	235
	236	for (i = 0; i < num_standard_resources; i++) {
	237	struct resource *mem = &standard_resources[i];
	238	phys_addr_t r_start, r_end, mem_size = resource_size(mem);
	239
	240	if (!memblock_is_region_reserved(mem->start, mem_size))
	241	continue;
	242
	243	for_each_reserved_mem_range(j, &r_start, &r_end) {
	244	resource_size_t start, end;
	245
	246	start = max(PFN_PHYS(PFN_DOWN(r_start)), mem->start);
	247	end = min(PFN_PHYS(PFN_UP(r_end)) - 1, mem->end);
	248
	249	if (start > mem->end \|\| end < mem->start)
	250	continue;
	251
	252	reserve_region_with_split(mem, start, end, "Reserved");
	253	}
	254	}
	255
	256	return 0;
	257	}
	258	arch_initcall(reserve_memblock_reserved_regions);
	259
	260	static void __init parse_dtb(void)
	261	{
	262	/* Early scan of device tree from init memory */
	263	if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
	264	const char *name = of_flat_dt_get_machine_name();
	265
	266	if (name) {
	267	pr_info("Machine model: %s\n", name);
	268	dump_stack_set_arch_desc("%s (DT)", name);
	269	}
	270	} else {
	271	pr_err("No DTB passed to the kernel\n");
	272	}
	273	}
	274
	275	#if defined(CONFIG_RISCV_COMBO_SPINLOCKS)
	276	DEFINE_STATIC_KEY_TRUE(qspinlock_key);
	277	EXPORT_SYMBOL(qspinlock_key);
	278	#endif
	279
	280	static void __init riscv_spinlock_init(void)
	281	{
	282	char *using_ext = NULL;
	283
	284	if (IS_ENABLED(CONFIG_RISCV_TICKET_SPINLOCKS)) {
	285	pr_info("Ticket spinlock: enabled\n");
	286	return;
	287	}
	288
	289	if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) &&
	290	IS_ENABLED(CONFIG_RISCV_ISA_ZACAS) &&
	291	riscv_isa_extension_available(NULL, ZABHA) &&
	292	riscv_isa_extension_available(NULL, ZACAS)) {
	293	using_ext = "using Zabha";
	294	} else if (riscv_isa_extension_available(NULL, ZICCRSE)) {
	295	using_ext = "using Ziccrse";
	296	}
	297	#if defined(CONFIG_RISCV_COMBO_SPINLOCKS)
	298	else {
	299	static_branch_disable(&qspinlock_key);
	300	pr_info("Ticket spinlock: enabled\n");
	301	return;
	302	}
	303	#endif
	304
	305	if (!using_ext)
	306	pr_err("Queued spinlock without Zabha or Ziccrse");
	307	else
	308	pr_info("Queued spinlock %s: enabled\n", using_ext);
	309	}
	310
	311	extern void __init init_rt_signal_env(void);
	312
	313	void __init setup_arch(char **cmdline_p)
	314	{
	315	parse_dtb();
	316	setup_initial_init_mm(_stext, _etext, _edata, _end);
	317
	318	*cmdline_p = boot_command_line;
	319
	320	early_ioremap_setup();
	321	sbi_init();
	322	jump_label_init();
	323	parse_early_param();
	324
	325	efi_init();
	326	paging_init();
	327
	328	/* Parse the ACPI tables for possible boot-time configuration */
	329	acpi_boot_table_init();
	330
	331	#if IS_ENABLED(CONFIG_BUILTIN_DTB)
	332	unflatten_and_copy_device_tree();
	333	#else
	334	unflatten_device_tree();
	335	#endif
	336	misc_mem_init();
	337
	338	init_resources();
	339
	340	#ifdef CONFIG_KASAN
	341	kasan_init();
	342	#endif
	343
	344	#ifdef CONFIG_SMP
	345	setup_smp();
	346	#endif
	347
	348	if (!acpi_disabled) {
	349	acpi_init_rintc_map();
	350	acpi_map_cpus_to_nodes();
	351	}
	352
	353	riscv_init_cbo_blocksizes();
	354	riscv_fill_hwcap();
	355	apply_boot_alternatives();
	356	init_rt_signal_env();
	357
	358	if (IS_ENABLED(CONFIG_RISCV_ISA_ZICBOM) &&
	359	riscv_isa_extension_available(NULL, ZICBOM))
	360	riscv_noncoherent_supported();
	361	riscv_set_dma_cache_alignment();
	362
	363	riscv_user_isa_enable();
	364	riscv_spinlock_init();
	365	}
	366
	367	bool arch_cpu_is_hotpluggable(int cpu)
	368	{
	369	return cpu_has_hotplug(cpu);
	370	}
	371
	372	void free_initmem(void)
	373	{
	374	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
	375	set_kernel_memory(lm_alias(__init_begin), lm_alias(__init_end), set_memory_rw_nx);
	376	if (IS_ENABLED(CONFIG_64BIT))
	377	set_kernel_memory(__init_begin, __init_end, set_memory_nx);
	378	}
	379
	380	free_initmem_default(POISON_FREE_INITMEM);
	381	}
	382
	383	static int dump_kernel_offset(struct notifier_block *self,
	384	unsigned long v, void *p)
	385	{
	386	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
	387	kernel_map.virt_offset,
	388	KERNEL_LINK_ADDR);
	389
	390	return 0;
	391	}
	392
	393	static struct notifier_block kernel_offset_notifier = {
	394	.notifier_call = dump_kernel_offset
	395	};
	396
	397	static int __init register_kernel_offset_dumper(void)
	398	{
	399	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
	400	atomic_notifier_chain_register(&panic_notifier_list,
	401	&kernel_offset_notifier);
	402
	403	return 0;
	404	}
	405	device_initcall(register_kernel_offset_dumper);