/* * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * 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/cpu.h>#include <linux/delay.h>#include <linux/hex.h>#include <linux/ioport.h>#include <linux/export.h>#include <linux/memblock.h>#include <linux/initrd.h>#include <linux/root_dev.h>#include <linux/highmem.h>#include <linux/console.h>#include <linux/pfn.h>#include <linux/debugfs.h>#include <linux/kexec.h>#include <linux/sizes.h>#include <linux/device.h>#include <linux/dma-map-ops.h>#include <linux/decompress/generic.h>#include <linux/of_fdt.h>#include <linux/dmi.h>#include <linux/crash_dump.h> #include <asm/addrspace.h>#include <asm/bootinfo.h>#include <asm/bugs.h>#include <asm/cache.h>#include <asm/cdmm.h>#include <asm/cpu.h>#include <asm/debug.h>#include <asm/mmzone.h>#include <asm/sections.h>#include <asm/setup.h>#include <asm/smp-ops.h>#include <asm/mips-cps.h>#include <asm/prom.h>#include <asm/fw/fw.h> #ifdef CONFIG_MIPS_ELF_APPENDED_DTBchar __section(".appended_dtb") __appended_dtb[0x100000];#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; EXPORT_SYMBOL(cpu_data); /* * Setup information * * These are initialized so they are in the .data section */unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; EXPORT_SYMBOL(mips_machtype); static char __initdata command_line[COMMAND_LINE_SIZE];char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; #ifdef CONFIG_CMDLINE_BOOLstatic const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;#elsestatic const char builtin_cmdline[] __initconst = "";#endif /* * mips_io_port_base is the begin of the address space to which x86 style * I/O ports are mapped. */unsigned long mips_io_port_base = -1;EXPORT_SYMBOL(mips_io_port_base); static struct resource code_resource = { .name = "Kernel code", };static struct resource data_resource = { .name = "Kernel data", };static struct resource bss_resource = { .name = "Kernel bss", }; unsigned long __kaslr_offset __ro_after_init;EXPORT_SYMBOL(__kaslr_offset); static void *detect_magic __initdata = detect_memory_region; #ifdef CONFIG_MIPS_AUTO_PFN_OFFSETunsigned long ARCH_PFN_OFFSET;EXPORT_SYMBOL(ARCH_PFN_OFFSET);#endif void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max){	void *dm = &detect_magic;	phys_addr_t size; 	for (size = sz_min; size < sz_max; size <<= 1) {		if (!memcmp(dm, dm + size, sizeof(detect_magic)))			break;	} 	pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",		((unsigned long long) size) / SZ_1M,		(unsigned long long) start,		((unsigned long long) sz_min) / SZ_1M,		((unsigned long long) sz_max) / SZ_1M); 	memblock_add(start, size);} /* * Manage initrd */#ifdef CONFIG_BLK_DEV_INITRD static int __init rd_start_early(char *p){	unsigned long start = memparse(p, &p); #ifdef CONFIG_64BIT	/* Guess if the sign extension was forgotten by bootloader */	if (start < XKPHYS)		start = (int)start;#endif	initrd_start = start;	initrd_end += start;	return 0;}early_param("rd_start", rd_start_early); static int __init rd_size_early(char *p){	initrd_end += memparse(p, &p);	return 0;}early_param("rd_size", rd_size_early); /* it returns the next free pfn after initrd */static unsigned long __init init_initrd(void){	unsigned long end; 	/*	 * Board specific code or command line parser should have	 * already set up initrd_start and initrd_end. In these cases	 * perform sanity checks and use them if all looks good.	 */	if (!initrd_start || initrd_end <= initrd_start)		goto disable; 	if (initrd_start & ~PAGE_MASK) {		pr_err("initrd start must be page aligned\n");		goto disable;	} 	/*	 * Sanitize initrd addresses. For example firmware	 * can't guess if they need to pass them through	 * 64-bits values if the kernel has been built in pure	 * 32-bit. We need also to switch from KSEG0 to XKPHYS	 * addresses now, so the code can now safely use __pa().	 */	end = __pa(initrd_end);	initrd_end = (unsigned long)__va(end);	initrd_start = (unsigned long)__va(__pa(initrd_start)); 	if (initrd_start < PAGE_OFFSET) {		pr_err("initrd start < PAGE_OFFSET\n");		goto disable;	} 	ROOT_DEV = Root_RAM0;	return PFN_UP(end);disable:	initrd_start = 0;	initrd_end = 0;	return 0;} /* In some conditions (e.g. big endian bootloader with a little endian   kernel), the initrd might appear byte swapped.  Try to detect this and   byte swap it if needed.  */static void __init maybe_bswap_initrd(void){#if defined(CONFIG_CPU_CAVIUM_OCTEON)	u64 buf; 	/* Check for CPIO signature */	if (!memcmp((void *)initrd_start, "070701", 6))		return; 	/* Check for compressed initrd */	if (decompress_method((unsigned char *)initrd_start, 8, NULL))		return; 	/* Try again with a byte swapped header */	buf = swab64p((u64 *)initrd_start);	if (!memcmp(&buf, "070701", 6) ||	    decompress_method((unsigned char *)(&buf), 8, NULL)) {		unsigned long i; 		pr_info("Byteswapped initrd detected\n");		for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)			swab64s((u64 *)i);	}#endif} static void __init finalize_initrd(void){	unsigned long size = initrd_end - initrd_start; 	if (size == 0) {		printk(KERN_INFO "Initrd not found or empty");		goto disable;	}	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {		printk(KERN_ERR "Initrd extends beyond end of memory");		goto disable;	} 	maybe_bswap_initrd(); 	memblock_reserve(__pa(initrd_start), size);	initrd_below_start_ok = 1; 	pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",		initrd_start, size);	return;disable:	printk(KERN_CONT " - disabling initrd\n");	initrd_start = 0;	initrd_end = 0;} #else  /* !CONFIG_BLK_DEV_INITRD */ static unsigned long __init init_initrd(void){	return 0;} #define finalize_initrd()	do {} while (0) #endif /* * Initialize the bootmem allocator. It also setup initrd related data * if needed. */#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) static void __init bootmem_init(void){	init_initrd();	finalize_initrd();} #else  /* !CONFIG_SGI_IP27 */ static void __init bootmem_init(void){	phys_addr_t ramstart, ramend;	unsigned long start, end;	int i; 	ramstart = memblock_start_of_DRAM();	ramend = memblock_end_of_DRAM(); 	/*	 * Sanity check any INITRD first. We don't take it into account	 * for bootmem setup initially, rely on the end-of-kernel-code	 * as our memory range starting point. Once bootmem is inited we	 * will reserve the area used for the initrd.	 */	init_initrd(); 	/* Reserve memory occupied by kernel. */	memblock_reserve(__pa_symbol(&_text),			__pa_symbol(&_end) - __pa_symbol(&_text)); 	/* max_low_pfn is not a number of pages but the end pfn of low mem */ #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET	ARCH_PFN_OFFSET = PFN_UP(ramstart);#else	/*	 * Reserve any memory between the start of RAM and PHYS_OFFSET	 */	if (ramstart > PHYS_OFFSET)		memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 	if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {		pr_info("Wasting %lu bytes for tracking %lu unused pages\n",			(unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),			(unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));	}#endif 	min_low_pfn = ARCH_PFN_OFFSET;	max_pfn = PFN_DOWN(ramend);	for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {		/*		 * Skip highmem here so we get an accurate max_low_pfn if low		 * memory stops short of high memory.		 * If the region overlaps HIGHMEM_START, end is clipped so		 * max_pfn excludes the highmem portion.		 */		if (start >= PFN_DOWN(HIGHMEM_START))			continue;		if (end > PFN_DOWN(HIGHMEM_START))			end = PFN_DOWN(HIGHMEM_START);		if (end > max_low_pfn)			max_low_pfn = end;	} 	if (min_low_pfn >= max_low_pfn)		panic("Incorrect memory mapping !!!"); 	if (max_pfn > PFN_DOWN(HIGHMEM_START)) {		max_low_pfn = PFN_DOWN(HIGHMEM_START);#ifdef CONFIG_HIGHMEM		highstart_pfn = max_low_pfn;		highend_pfn = max_pfn;#else		max_pfn = max_low_pfn;#endif	} 	/*	 * Reserve initrd memory if needed.	 */	finalize_initrd();} #endif	/* CONFIG_SGI_IP27 */ 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); 	if (IS_ENABLED(CONFIG_NUMA))		memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);	else		memblock_add(start, size); 	return 0;}early_param("mem", early_parse_mem); static int __init early_parse_memmap(char *p){	char *oldp;	u64 start_at, mem_size; 	if (!p)		return -EINVAL; 	if (!strncmp(p, "exactmap", 8)) {		pr_err("\"memmap=exactmap\" invalid on MIPS\n");		return 0;	} 	oldp = p;	mem_size = memparse(p, &p);	if (p == oldp)		return -EINVAL; 	if (*p == '@') {		start_at = memparse(p+1, &p);		memblock_add(start_at, mem_size);	} else if (*p == '#') {		pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");		return -EINVAL;	} else if (*p == '$') {		start_at = memparse(p+1, &p);		memblock_add(start_at, mem_size);		memblock_reserve(start_at, mem_size);	} else {		pr_err("\"memmap\" invalid format!\n");		return -EINVAL;	} 	if (*p == '\0') {		usermem = 1;		return 0;	} else		return -EINVAL;}early_param("memmap", early_parse_memmap); static void __init mips_reserve_vmcore(void){#ifdef CONFIG_PROC_VMCORE	phys_addr_t start, end;	u64 i; 	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;			}		}	} 	pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",		(unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10); 	memblock_reserve(elfcorehdr_addr, elfcorehdr_size);#endif} /* 64M alignment for crash kernel regions */#define CRASH_ALIGN	SZ_64M#define CRASH_ADDR_MAX	SZ_512M static void __init mips_parse_crashkernel(void){	unsigned long long total_mem;	unsigned long long crash_size, crash_base;	int ret; 	if (!IS_ENABLED(CONFIG_CRASH_RESERVE))		return; 	total_mem = memblock_phys_mem_size();	ret = parse_crashkernel(boot_command_line, total_mem,				&crash_size, &crash_base,				NULL, NULL, NULL);	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 {		unsigned long long start; 		start = memblock_phys_alloc_range(crash_size, 1,						  crash_base,						  crash_base + crash_size);		if (start != crash_base) {			pr_warn("Invalid memory region reserved for crash kernel\n");			return;		}	} 	crashk_res.start = crash_base;	crashk_res.end	 = crash_base + crash_size - 1;} static void __init request_crashkernel(struct resource *res){	int ret; 	if (!IS_ENABLED(CONFIG_CRASH_RESERVE))		return; 	if (crashk_res.start == crashk_res.end)		return; 	ret = request_resource(res, &crashk_res);

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