// 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 <linux/jump_label.h>#include <linux/gcd.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");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_DUMPstatic 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; 	ret = insert_resource(parent, res);	if (ret < 0)		pr_err("Failed to add resource %s %pR\n", res->name, res); 	return ret;} 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) &&	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_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(); 	acpi_table_upgrade(); 	/* Parse the ACPI tables for possible boot-time configuration */	acpi_boot_table_init(); 	if (acpi_disabled) {#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(); 	if (!IS_ENABLED(CONFIG_RISCV_ISA_ZBB) || !riscv_isa_extension_available(NULL, ZBB))		static_branch_disable(&efficient_ffs_key);} 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);