// 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/init.h>#include <linux/mm.h>#include <linux/memblock.h>#include <linux/sched.h>#include <linux/console.h>#include <linux/screen_info.h>#include <linux/of_fdt.h>#include <linux/of_platform.h>#include <linux/sched/task.h>#include <linux/swiotlb.h>#include <linux/smp.h>#include <linux/efi.h>#include <linux/crash_dump.h> #include <asm/cpu_ops.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" #if defined(CONFIG_DUMMY_CONSOLE) || defined(CONFIG_EFI)struct screen_info screen_info __section(".data") = {	.orig_video_lines	= 30,	.orig_video_cols	= 80,	.orig_video_mode	= 0,	.orig_video_ega_bx	= 0,	.orig_video_isVGA	= 1,	.orig_video_points	= 8};#endif /* * 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;static DEFINE_PER_CPU(struct cpu, cpu_devices); /* * 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 __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;	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(mem_res_sz, SMP_CACHE_BYTES);	if (!mem_res)		panic("%s: Failed to allocate %zu bytes\n", __func__, mem_res_sz); 	/*	 * 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_KEXEC_CORE	if (crashk_res.start != crashk_res.end) {		ret = add_resource(&iomem_resource, &crashk_res);		if (ret < 0)			goto error;	}#endif #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_BUSY;		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--]; 		if (unlikely(memblock_is_nomap(region))) {			res->name = "Reserved";			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;		} 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;	} 	/* Clean-up any unused pre-allocated resources */	mem_res_sz = (num_resources - res_idx + 1) * sizeof(*mem_res);	memblock_free(__pa(mem_res), mem_res_sz);	return;  error:	/* Better an empty resource tree than an inconsistent one */	release_child_resources(&iomem_resource);	memblock_free(__pa(mem_res), mem_res_sz);}  static void __init parse_dtb(void){	/* Early scan of device tree from init memory */	if (early_init_dt_scan(dtb_early_va)) {		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);		}		return;	} 	pr_err("No DTB passed to the kernel\n");#ifdef CONFIG_CMDLINE_FORCE	strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);	pr_info("Forcing kernel command line to: %s\n", boot_command_line);#endif} void __init setup_arch(char **cmdline_p){	parse_dtb();	init_mm.start_code = (unsigned long) _stext;	init_mm.end_code   = (unsigned long) _etext;	init_mm.end_data   = (unsigned long) _edata;	init_mm.brk        = (unsigned long) _end; 	*cmdline_p = boot_command_line; 	early_ioremap_setup();	jump_label_init();	parse_early_param(); 	efi_init();	setup_bootmem();	paging_init();#if IS_ENABLED(CONFIG_BUILTIN_DTB)	unflatten_and_copy_device_tree();#else	if (early_init_dt_verify(__va(XIP_FIXUP(dtb_early_pa))))		unflatten_device_tree();	else		pr_err("No DTB found in kernel mappings\n");#endif	misc_mem_init(); 	init_resources();	sbi_init(); 	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {		protect_kernel_text_data();		protect_kernel_linear_mapping_text_rodata();	} #ifdef CONFIG_SWIOTLB	swiotlb_init(1);#endif #ifdef CONFIG_KASAN	kasan_init();#endif #ifdef CONFIG_SMP	setup_smp();#endif 	riscv_fill_hwcap();} static int __init topology_init(void){	int i, ret; 	for_each_online_node(i)		register_one_node(i); 	for_each_possible_cpu(i) {		struct cpu *cpu = &per_cpu(cpu_devices, i); 		cpu->hotpluggable = cpu_has_hotplug(i);		ret = register_cpu(cpu, i);		if (unlikely(ret))			pr_warn("Warning: %s: register_cpu %d failed (%d)\n",			       __func__, i, ret);	} 	return 0;}subsys_initcall(topology_init); void free_initmem(void){	unsigned long init_begin = (unsigned long)__init_begin;	unsigned long init_end = (unsigned long)__init_end; 	if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))		set_memory_rw_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT); 	free_initmem_default(POISON_FREE_INITMEM);}