Skip to content
Snippets Groups Projects
Select Git revision
  • b4819b593740a6d11db07b52e0fe35975b29a185
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

setup.c

Blame
  • setup.c 13.86 KiB
    /*
     * 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  Maciej W. Rozycki
     */
    #include <linux/config.h>
    #include <linux/errno.h>
    #include <linux/init.h>
    #include <linux/ioport.h>
    #include <linux/sched.h>
    #include <linux/kernel.h>
    #include <linux/mm.h>
    #include <linux/module.h>
    #include <linux/stddef.h>
    #include <linux/string.h>
    #include <linux/unistd.h>
    #include <linux/slab.h>
    #include <linux/user.h>
    #include <linux/utsname.h>
    #include <linux/a.out.h>
    #include <linux/tty.h>
    #include <linux/bootmem.h>
    #include <linux/initrd.h>
    #include <linux/major.h>
    #include <linux/kdev_t.h>
    #include <linux/root_dev.h>
    #include <linux/highmem.h>
    #include <linux/console.h>
    #include <linux/mmzone.h>
    
    #include <asm/addrspace.h>
    #include <asm/bootinfo.h>
    #include <asm/cpu.h>
    #include <asm/sections.h>
    #include <asm/setup.h>
    #include <asm/system.h>
    
    struct cpuinfo_mips cpu_data[NR_CPUS];
    
    EXPORT_SYMBOL(cpu_data);
    
    #ifdef CONFIG_VT
    struct screen_info screen_info;
    #endif
    
    /*
     * Despite it's name this variable is even if we don't have PCI
     */
    unsigned int PCI_DMA_BUS_IS_PHYS;
    
    EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
    
    /*
     * Setup information
     *
     * These are initialized so they are in the .data section
     */
    unsigned long mips_machtype = MACH_UNKNOWN;
    unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
    
    EXPORT_SYMBOL(mips_machtype);
    EXPORT_SYMBOL(mips_machgroup);
    
    struct boot_mem_map boot_mem_map;
    
    static char command_line[CL_SIZE];
           char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
    
    /*
     * mips_io_port_base is the begin of the address space to which x86 style
     * I/O ports are mapped.
     */
    const unsigned long mips_io_port_base = -1;
    EXPORT_SYMBOL(mips_io_port_base);
    
    /*
     * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
     * for the processor.
     */
    unsigned long isa_slot_offset;
    EXPORT_SYMBOL(isa_slot_offset);
    
    static struct resource code_resource = { .name = "Kernel code", };
    static struct resource data_resource = { .name = "Kernel data", };
    
    void __init add_memory_region(phys_t start, phys_t size, long type)
    {
    	int x = boot_mem_map.nr_map;
    	struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
    
    	/*
    	 * Try to merge with previous entry if any.  This is far less than
    	 * perfect but is sufficient for most real world cases.
    	 */
    	if (x && prev->addr + prev->size == start && prev->type == type) {
    		prev->size += size;
    		return;
    	}
    
    	if (x == BOOT_MEM_MAP_MAX) {
    		printk("Ooops! Too many entries in the memory map!\n");
    		return;
    	}
    
    	boot_mem_map.map[x].addr = start;
    	boot_mem_map.map[x].size = size;
    	boot_mem_map.map[x].type = type;
    	boot_mem_map.nr_map++;
    }
    
    static void __init print_memory_map(void)
    {
    	int i;
    	const int field = 2 * sizeof(unsigned long);
    
    	for (i = 0; i < boot_mem_map.nr_map; i++) {
    		printk(" memory: %0*Lx @ %0*Lx ",
    		       field, (unsigned long long) boot_mem_map.map[i].size,
    		       field, (unsigned long long) boot_mem_map.map[i].addr);
    
    		switch (boot_mem_map.map[i].type) {
    		case BOOT_MEM_RAM:
    			printk("(usable)\n");
    			break;
    		case BOOT_MEM_ROM_DATA:
    			printk("(ROM data)\n");
    			break;
    		case BOOT_MEM_RESERVED:
    			printk("(reserved)\n");
    			break;
    		default:
    			printk("type %lu\n", boot_mem_map.map[i].type);
    			break;
    		}
    	}
    }
    
    static inline void parse_cmdline_early(void)
    {
    	char c = ' ', *to = command_line, *from = saved_command_line;
    	unsigned long start_at, mem_size;
    	int len = 0;
    	int usermem = 0;
    
    	printk("Determined physical RAM map:\n");
    	print_memory_map();
    
    	for (;;) {
    		/*
    		 * "mem=XXX[kKmM]" defines a memory region from
    		 * 0 to <XXX>, overriding the determined size.
    		 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
    		 * <YYY> to <YYY>+<XXX>, overriding the determined size.
    		 */
    		if (c == ' ' && !memcmp(from, "mem=", 4)) {
    			if (to != command_line)
    				to--;
    			/*
    			 * If a user specifies memory size, we
    			 * blow away any automatically generated
    			 * size.
    			 */
    			if (usermem == 0) {
    				boot_mem_map.nr_map = 0;
    				usermem = 1;
    			}
    			mem_size = memparse(from + 4, &from);
    			if (*from == '@')
    				start_at = memparse(from + 1, &from);
    			else
    				start_at = 0;
    			add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
    		}
    		c = *(from++);
    		if (!c)
    			break;
    		if (CL_SIZE <= ++len)
    			break;
    		*(to++) = c;
    	}
    	*to = '\0';
    
    	if (usermem) {
    		printk("User-defined physical RAM map:\n");
    		print_memory_map();
    	}
    }
    
    static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
    {
    	/*
    	 * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
    	 * "rd_size=0xNN" it's size
    	 */
    	unsigned long start = 0;
    	unsigned long size = 0;
    	unsigned long end;
    	char cmd_line[CL_SIZE];
    	char *start_str;
    	char *size_str;
    	char *tmp;
    
    	strcpy(cmd_line, command_line);
    	*command_line = 0;
    	tmp = cmd_line;
    	/* Ignore "rd_start=" strings in other parameters. */
    	start_str = strstr(cmd_line, "rd_start=");
    	if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
    		start_str = strstr(start_str, " rd_start=");
    	while (start_str) {
    		if (start_str != cmd_line)
    			strncat(command_line, tmp, start_str - tmp);
    		start = memparse(start_str + 9, &start_str);
    		tmp = start_str + 1;
    		start_str = strstr(start_str, " rd_start=");
    	}
    	if (*tmp)
    		strcat(command_line, tmp);
    
    	strcpy(cmd_line, command_line);
    	*command_line = 0;
    	tmp = cmd_line;
    	/* Ignore "rd_size" strings in other parameters. */
    	size_str = strstr(cmd_line, "rd_size=");
    	if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
    		size_str = strstr(size_str, " rd_size=");
    	while (size_str) {
    		if (size_str != cmd_line)
    			strncat(command_line, tmp, size_str - tmp);
    		size = memparse(size_str + 8, &size_str);
    		tmp = size_str + 1;
    		size_str = strstr(size_str, " rd_size=");
    	}
    	if (*tmp)
    		strcat(command_line, tmp);
    
    #ifdef CONFIG_MIPS64
    	/* HACK: Guess if the sign extension was forgotten */
    	if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
    		start |= 0xffffffff00000000;
    #endif
    
    	end = start + size;
    	if (start && end) {
    		*rd_start = start;
    		*rd_end = end;
    		return 1;
    	}
    	return 0;
    }
    
    #define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
    #define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
    #define PFN_PHYS(x)	((x) << PAGE_SHIFT)
    
    #define MAXMEM		HIGHMEM_START
    #define MAXMEM_PFN	PFN_DOWN(MAXMEM)
    
    static inline void bootmem_init(void)
    {
    	unsigned long start_pfn;
    	unsigned long reserved_end = (unsigned long)&_end;
    #ifndef CONFIG_SGI_IP27
    	unsigned long first_usable_pfn;
    	unsigned long bootmap_size;
    	int i;
    #endif
    #ifdef CONFIG_BLK_DEV_INITRD
    	int initrd_reserve_bootmem = 0;
    
    	/* Board specific code should have set up initrd_start and initrd_end */
     	ROOT_DEV = Root_RAM0;
    	if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
    		reserved_end = max(reserved_end, initrd_end);
    		initrd_reserve_bootmem = 1;
    	} else {
    		unsigned long tmp;
    		u32 *initrd_header;
    
    		tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
    		if (tmp < reserved_end)
    			tmp += PAGE_SIZE;
    		initrd_header = (u32 *)tmp;
    		if (initrd_header[0] == 0x494E5244) {
    			initrd_start = (unsigned long)&initrd_header[2];
    			initrd_end = initrd_start + initrd_header[1];
    			reserved_end = max(reserved_end, initrd_end);
    			initrd_reserve_bootmem = 1;
    		}
    	}
    #endif	/* CONFIG_BLK_DEV_INITRD */
    
    	/*
    	 * Partially used pages are not usable - thus
    	 * we are rounding upwards.
    	 */
    	start_pfn = PFN_UP(CPHYSADDR(reserved_end));
    
    #ifndef CONFIG_SGI_IP27
    	/* Find the highest page frame number we have available.  */
    	max_pfn = 0;
    	first_usable_pfn = -1UL;
    	for (i = 0; i < boot_mem_map.nr_map; i++) {
    		unsigned long start, end;
    
    		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
    			continue;
    
    		start = PFN_UP(boot_mem_map.map[i].addr);
    		end = PFN_DOWN(boot_mem_map.map[i].addr
    		      + boot_mem_map.map[i].size);
    
    		if (start >= end)
    			continue;
    		if (end > max_pfn)
    			max_pfn = end;
    		if (start < first_usable_pfn) {
    			if (start > start_pfn) {
    				first_usable_pfn = start;
    			} else if (end > start_pfn) {
    				first_usable_pfn = start_pfn;
    			}
    		}
    	}
    
    	/*
    	 * Determine low and high memory ranges
    	 */
    	max_low_pfn = max_pfn;
    	if (max_low_pfn > MAXMEM_PFN) {
    		max_low_pfn = MAXMEM_PFN;
    #ifndef CONFIG_HIGHMEM
    		/* Maximum memory usable is what is directly addressable */
    		printk(KERN_WARNING "Warning only %ldMB will be used.\n",
    		       MAXMEM >> 20);
    		printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
    #endif
    	}
    
    #ifdef CONFIG_HIGHMEM
    	/*
    	 * Crude, we really should make a better attempt at detecting
    	 * highstart_pfn
    	 */
    	highstart_pfn = highend_pfn = max_pfn;
    	if (max_pfn > MAXMEM_PFN) {
    		highstart_pfn = MAXMEM_PFN;
    		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
    		       (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
    	}
    #endif
    
    	memory_present(0, first_usable_pfn, max_low_pfn);
    
    	/* Initialize the boot-time allocator with low memory only.  */
    	bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
    
    	/*
    	 * Register fully available low RAM pages with the bootmem allocator.
    	 */
    	for (i = 0; i < boot_mem_map.nr_map; i++) {
    		unsigned long curr_pfn, last_pfn, size;
    
    		/*
    		 * Reserve usable memory.
    		 */
    		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
    			continue;
    
    		/*
    		 * We are rounding up the start address of usable memory:
    		 */
    		curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
    		if (curr_pfn >= max_low_pfn)
    			continue;
    		if (curr_pfn < start_pfn)
    			curr_pfn = start_pfn;
    
    		/*
    		 * ... and at the end of the usable range downwards:
    		 */
    		last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
    				    + boot_mem_map.map[i].size);
    
    		if (last_pfn > max_low_pfn)
    			last_pfn = max_low_pfn;
    
    		/*
    		 * Only register lowmem part of lowmem segment with bootmem.
    		 */
    		size = last_pfn - curr_pfn;
    		if (curr_pfn > PFN_DOWN(HIGHMEM_START))
    			continue;
    		if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
    			size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
    		if (!size)
    			continue;
    
    		/*
    		 * ... finally, did all the rounding and playing
    		 * around just make the area go away?
    		 */
    		if (last_pfn <= curr_pfn)
    			continue;
    
    		/* Register lowmem ranges */
    		free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
    	}
    
    	/* Reserve the bootmap memory.  */
    	reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
    #endif /* CONFIG_SGI_IP27 */
    
    #ifdef CONFIG_BLK_DEV_INITRD
    	initrd_below_start_ok = 1;
    	if (initrd_start) {
    		unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
    		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
    		       (void *)initrd_start, initrd_size);
    
    		if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
    			printk("initrd extends beyond end of memory "
    			       "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
    			       sizeof(long) * 2,
    			       (unsigned long long)CPHYSADDR(initrd_end),
    			       sizeof(long) * 2,
    			       (unsigned long long)PFN_PHYS(max_low_pfn));
    			initrd_start = initrd_end = 0;
    			initrd_reserve_bootmem = 0;
    		}
    
    		if (initrd_reserve_bootmem)
    			reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
    	}
    #endif /* CONFIG_BLK_DEV_INITRD  */
    }
    
    static inline void resource_init(void)
    {
    	int i;
    
    #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
    	/*
    	 * The 64bit code in 32bit object format trick can't represent
    	 * 64bit wide relocations for linker script symbols.
    	 */
    	code_resource.start = CPHYSADDR(&_text);
    	code_resource.end = CPHYSADDR(&_etext) - 1;
    	data_resource.start = CPHYSADDR(&_etext);
    	data_resource.end = CPHYSADDR(&_edata) - 1;
    #else
    	code_resource.start = virt_to_phys(&_text);
    	code_resource.end = virt_to_phys(&_etext) - 1;
    	data_resource.start = virt_to_phys(&_etext);
    	data_resource.end = virt_to_phys(&_edata) - 1;
    #endif
    
    	/*
    	 * Request address space for all standard RAM.
    	 */
    	for (i = 0; i < boot_mem_map.nr_map; i++) {
    		struct resource *res;
    		unsigned long start, end;
    
    		start = boot_mem_map.map[i].addr;
    		end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
    		if (start >= MAXMEM)
    			continue;
    		if (end >= MAXMEM)
    			end = MAXMEM - 1;
    
    		res = alloc_bootmem(sizeof(struct resource));
    		switch (boot_mem_map.map[i].type) {
    		case BOOT_MEM_RAM:
    		case BOOT_MEM_ROM_DATA:
    			res->name = "System RAM";
    			break;
    		case BOOT_MEM_RESERVED:
    		default:
    			res->name = "reserved";
    		}
    
    		res->start = start;
    		res->end = end;
    
    		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
    		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);
    	}
    }
    
    #undef PFN_UP
    #undef PFN_DOWN
    #undef PFN_PHYS
    
    #undef MAXMEM
    #undef MAXMEM_PFN
    
    static int __initdata earlyinit_debug;
    
    static int __init earlyinit_debug_setup(char *str)
    {
    	earlyinit_debug = 1;
    	return 1;
    }
    __setup("earlyinit_debug", earlyinit_debug_setup);
    
    extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
    
    static void __init do_earlyinitcalls(void)
    {
    	initcall_t *call, *start, *end;
    
    	start = &__earlyinitcall_start;
    	end = &__earlyinitcall_end;
    
    	for (call = start; call < end; call++) {
    		if (earlyinit_debug)
    			printk("calling earlyinitcall 0x%p\n", *call);
    
    		(*call)();
    	}
    }
    
    void __init setup_arch(char **cmdline_p)
    {
    	cpu_probe();
    	prom_init();
    	cpu_report();
    
    #if defined(CONFIG_VT)
    #if defined(CONFIG_VGA_CONSOLE)
            conswitchp = &vga_con;
    #elif defined(CONFIG_DUMMY_CONSOLE)
            conswitchp = &dummy_con;
    #endif
    #endif
    
    	/* call board setup routine */
    	do_earlyinitcalls();
    
    	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
    	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
    
    	*cmdline_p = command_line;
    
    	parse_cmdline_early();
    	bootmem_init();
    	sparse_init();
    	paging_init();
    	resource_init();
    }
    
    int __init fpu_disable(char *s)
    {
    	cpu_data[0].options &= ~MIPS_CPU_FPU;
    
    	return 1;
    }
    
    __setup("nofpu", fpu_disable);