arch/mips/kernel/setup.c - maze/linux - Git at Google

 /*
  * 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/ioport.h>
 #include <linux/module.h>
 #include <linux/screen_info.h>
 #include <linux/bootmem.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 <asm/addrspace.h>
 #include <asm/bootinfo.h>
 #include <asm/bugs.h>
 #include <asm/cache.h>
 #include <asm/cpu.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp-ops.h>
 #include <asm/system.h>

 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;

 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 __read_mostly = MACH_UNKNOWN;

 EXPORT_SYMBOL(mips_machtype);

 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 __read_mostly = -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;

 	/* Sanity check */
 	if (start + size < start) {
 		printk("Trying to add an invalid memory region, skipped\n");
 		return;
 	}

 	/*
 	 * 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;
 		}
 	}
 }

 /*
  * 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;
 	u32 *initrd_header;

 	/*
 	 * Board specific code or command line parser should have
 	 * already set up initrd_start and initrd_end. In these cases
 	 * perfom sanity checks and use them if all looks good.
 	 */
 	if (initrd_start && initrd_end > initrd_start)
 		goto sanitize;

 	/*
 	 * See if initrd has been added to the kernel image by
 	 * arch/mips/boot/addinitrd.c. In that case a header is
 	 * prepended to initrd and is made up by 8 bytes. The fisrt
 	 * word is a magic number and the second one is the size of
 	 * initrd.  Initrd start must be page aligned in any cases.
 	 */
 	initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
 	if (initrd_header[0] != 0x494E5244)
 		goto disable;
 	initrd_start = (unsigned long)(initrd_header + 2);
 	initrd_end = initrd_start + initrd_header[1];

 sanitize:
 	if (initrd_start & ~PAGE_MASK) {
 		printk(KERN_ERR "initrd start must be page aligned\n");
 		goto disable;
 	}
 	if (initrd_start < PAGE_OFFSET) {
 		printk(KERN_ERR "initrd start < PAGE_OFFSET\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));

 	ROOT_DEV = Root_RAM0;
 	return PFN_UP(end);
 disable:
 	initrd_start = 0;
 	initrd_end = 0;
 	return 0;
 }

 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("Initrd extends beyond end of memory");
 		goto disable;
 	}

 	reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 	initrd_below_start_ok = 1;

 	printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
 	       initrd_start, size);
 	return;
 disable:
 	printk(" - 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.
  */
 #ifdef CONFIG_SGI_IP27

 static void __init bootmem_init(void)
 {
 	init_initrd();
 	finalize_initrd();
 }

 #else  /* !CONFIG_SGI_IP27 */

 static void __init bootmem_init(void)
 {
 	unsigned long reserved_end;
 	unsigned long mapstart = ~0UL;
 	unsigned long bootmap_size;
 	int i;

 	/*
 	 * Init any data related to initrd. It's a nop if INITRD is
 	 * not selected. Once that done we can determine the low bound
 	 * of usable memory.
 	 */
 	reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));

 	/*
 	 * max_low_pfn is not a number of pages. The number of pages
 	 * of the system is given by 'max_low_pfn - min_low_pfn'.
 	 */
 	min_low_pfn = ~0UL;
 	max_low_pfn = 0;

 	/*
 	 * Find the highest page frame number we have available.
 	 */
 	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 (end > max_low_pfn)
 			max_low_pfn = end;
 		if (start < min_low_pfn)
 			min_low_pfn = start;
 		if (end <= reserved_end)
 			continue;
 		if (start >= mapstart)
 			continue;
 		mapstart = max(reserved_end, start);
 	}

 	if (min_low_pfn >= max_low_pfn)
 		panic("Incorrect memory mapping !!!");
 	if (min_low_pfn > ARCH_PFN_OFFSET) {
 		printk(KERN_INFO
 		       "Wasting %lu bytes for tracking %lu unused pages\n",
 		       (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 		       min_low_pfn - ARCH_PFN_OFFSET);
 	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
 		printk(KERN_INFO
 		       "%lu free pages won't be used\n",
 		       ARCH_PFN_OFFSET - min_low_pfn);
 	}
 	min_low_pfn = ARCH_PFN_OFFSET;

 	/*
 	 * Determine low and high memory ranges
 	 */
 	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 #ifdef CONFIG_HIGHMEM
 		highstart_pfn = PFN_DOWN(HIGHMEM_START);
 		highend_pfn = max_low_pfn;
 #endif
 		max_low_pfn = PFN_DOWN(HIGHMEM_START);
 	}

 	/*
 	 * Initialize the boot-time allocator with low memory only.
 	 */
 	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 					 min_low_pfn, max_low_pfn);


 	for (i = 0; i < boot_mem_map.nr_map; i++) {
 		unsigned long start, end;

 		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 <= min_low_pfn)
 			start = min_low_pfn;
 		if (start >= end)
 			continue;

 #ifndef CONFIG_HIGHMEM
 		if (end > max_low_pfn)
 			end = max_low_pfn;

 		/*
 		 * ... finally, is the area going away?
 		 */
 		if (end <= start)
 			continue;
 #endif

 		add_active_range(0, start, end);
 	}

 	/*
 	 * Register fully available low RAM pages with the bootmem allocator.
 	 */
 	for (i = 0; i < boot_mem_map.nr_map; i++) {
 		unsigned long start, end, size;

 		/*
 		 * Reserve usable memory.
 		 */
 		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);
 		/*
 		 * We are rounding up the start address of usable memory
 		 * and at the end of the usable range downwards.
 		 */
 		if (start >= max_low_pfn)
 			continue;
 		if (start < reserved_end)
 			start = reserved_end;
 		if (end > max_low_pfn)
 			end = max_low_pfn;

 		/*
 		 * ... finally, is the area going away?
 		 */
 		if (end <= start)
 			continue;
 		size = end - start;

 		/* Register lowmem ranges */
 		free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 		memory_present(0, start, end);
 	}

 	/*
 	 * Reserve the bootmap memory.
 	 */
 	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);

 	/*
 	 * Reserve initrd memory if needed.
 	 */
 	finalize_initrd();
 }

 #endif	/* CONFIG_SGI_IP27 */

 /*
  * arch_mem_init - initialize memory management subsystem
  *
  *  o plat_mem_setup() detects the memory configuration and will record detected
  *    memory areas using add_memory_region.
  *
  * At this stage the memory configuration of the system is known to the
  * kernel but generic memory management system is still entirely uninitialized.
  *
  *  o bootmem_init()
  *  o sparse_init()
  *  o paging_init()
  *
  * At this stage the bootmem allocator is ready to use.
  *
  * NOTE: historically plat_mem_setup did the entire platform initialization.
  *       This was rather impractical because it meant plat_mem_setup had to
  * get away without any kind of memory allocator.  To keep old code from
  * breaking plat_setup was just renamed to plat_setup and a second platform
  * initialization hook for anything else was introduced.
  */

 static int usermem __initdata = 0;

 static int __init early_parse_mem(char *p)
 {
 	unsigned long start, size;

 	/*
 	 * If a user specifies memory size, we
 	 * blow away any automatically generated
 	 * size.
 	 */
 	if (usermem == 0) {
 		boot_mem_map.nr_map = 0;
 		usermem = 1;
  	}
 	start = 0;
 	size = memparse(p, &p);
 	if (*p == '@')
 		start = memparse(p + 1, &p);

 	add_memory_region(start, size, BOOT_MEM_RAM);
 	return 0;
 }
 early_param("mem", early_parse_mem);

 static void __init arch_mem_init(char **cmdline_p)
 {
 	extern void plat_mem_setup(void);

 	/* call board setup routine */
 	plat_mem_setup();

 	printk("Determined physical RAM map:\n");
 	print_memory_map();

 	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
 	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);

 	*cmdline_p = command_line;

 	parse_early_param();

 	if (usermem) {
 		printk("User-defined physical RAM map:\n");
 		print_memory_map();
 	}

 	bootmem_init();
 	sparse_init();
 	paging_init();
 }

 static void __init resource_init(void)
 {
 	int i;

 	if (UNCAC_BASE != IO_BASE)
 		return;

 	code_resource.start = __pa_symbol(&_text);
 	code_resource.end = __pa_symbol(&_etext) - 1;
 	data_resource.start = __pa_symbol(&_etext);
 	data_resource.end = __pa_symbol(&_edata) - 1;

 	/*
 	 * 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 >= HIGHMEM_START)
 			continue;
 		if (end >= HIGHMEM_START)
 			end = HIGHMEM_START - 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);
 	}
 }

 void __init setup_arch(char **cmdline_p)
 {
 	cpu_probe();
 	prom_init();

 #ifdef CONFIG_EARLY_PRINTK
 	{
 		extern void setup_early_printk(void);

 		setup_early_printk();
 	}
 #endif
 	cpu_report();
 	check_bugs_early();

 #if defined(CONFIG_VT)
 #if defined(CONFIG_VGA_CONSOLE)
 	conswitchp = &vga_con;
 #elif defined(CONFIG_DUMMY_CONSOLE)
 	conswitchp = &dummy_con;
 #endif
 #endif

 	arch_mem_init(cmdline_p);

 	resource_init();
 	plat_smp_setup();
 }

 static int __init fpu_disable(char *s)
 {
 	int i;

 	for (i = 0; i < NR_CPUS; i++)
 		cpu_data[i].options &= ~MIPS_CPU_FPU;

 	return 1;
 }

 __setup("nofpu", fpu_disable);

 static int __init dsp_disable(char *s)
 {
 	cpu_data[0].ases &= ~MIPS_ASE_DSP;

 	return 1;
 }

 __setup("nodsp", dsp_disable);

 unsigned long kernelsp[NR_CPUS];
 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;

 #ifdef CONFIG_DEBUG_FS
 struct dentry *mips_debugfs_dir;
 static int __init debugfs_mips(void)
 {
 	struct dentry *d;

 	d = debugfs_create_dir("mips", NULL);
 	if (IS_ERR(d))
 		return PTR_ERR(d);
 	mips_debugfs_dir = d;
 	return 0;
 }
 arch_initcall(debugfs_mips);
 #endif
	/*
	* 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/ioport.h>
	#include <linux/module.h>
	#include <linux/screen_info.h>
	#include <linux/bootmem.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 <asm/addrspace.h>
	#include <asm/bootinfo.h>
	#include <asm/bugs.h>
	#include <asm/cache.h>
	#include <asm/cpu.h>
	#include <asm/sections.h>
	#include <asm/setup.h>
	#include <asm/smp-ops.h>
	#include <asm/system.h>

	struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;

	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 __read_mostly = MACH_UNKNOWN;

	EXPORT_SYMBOL(mips_machtype);

	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 __read_mostly = -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;

	/* Sanity check */
	if (start + size < start) {
	printk("Trying to add an invalid memory region, skipped\n");
	return;
	}

	/*
	* 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: %0Lx @ %0Lx ",
	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;
	}
	}
	}

	/*
	* 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;
	u32 *initrd_header;

	/*
	* Board specific code or command line parser should have
	* already set up initrd_start and initrd_end. In these cases
	* perfom sanity checks and use them if all looks good.
	*/
	if (initrd_start && initrd_end > initrd_start)
	goto sanitize;

	/*
	* See if initrd has been added to the kernel image by
	* arch/mips/boot/addinitrd.c. In that case a header is
	* prepended to initrd and is made up by 8 bytes. The fisrt
	* word is a magic number and the second one is the size of
	* initrd. Initrd start must be page aligned in any cases.
	*/
	initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
	if (initrd_header[0] != 0x494E5244)
	goto disable;
	initrd_start = (unsigned long)(initrd_header + 2);
	initrd_end = initrd_start + initrd_header[1];

	sanitize:
	if (initrd_start & ~PAGE_MASK) {
	printk(KERN_ERR "initrd start must be page aligned\n");
	goto disable;
	}
	if (initrd_start < PAGE_OFFSET) {
	printk(KERN_ERR "initrd start < PAGE_OFFSET\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));

	ROOT_DEV = Root_RAM0;
	return PFN_UP(end);
	disable:
	initrd_start = 0;
	initrd_end = 0;
	return 0;
	}

	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("Initrd extends beyond end of memory");
	goto disable;
	}

	reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
	initrd_below_start_ok = 1;

	printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
	initrd_start, size);
	return;
	disable:
	printk(" - 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.
	*/
	#ifdef CONFIG_SGI_IP27

	static void __init bootmem_init(void)
	{
	init_initrd();
	finalize_initrd();
	}

	#else /* !CONFIG_SGI_IP27 */

	static void __init bootmem_init(void)
	{
	unsigned long reserved_end;
	unsigned long mapstart = ~0UL;
	unsigned long bootmap_size;
	int i;

	/*
	* Init any data related to initrd. It's a nop if INITRD is
	* not selected. Once that done we can determine the low bound
	* of usable memory.
	*/
	reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));

	/*
	* max_low_pfn is not a number of pages. The number of pages
	* of the system is given by 'max_low_pfn - min_low_pfn'.
	*/
	min_low_pfn = ~0UL;
	max_low_pfn = 0;

	/*
	* Find the highest page frame number we have available.
	*/
	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 (end > max_low_pfn)
	max_low_pfn = end;
	if (start < min_low_pfn)
	min_low_pfn = start;
	if (end <= reserved_end)
	continue;
	if (start >= mapstart)
	continue;
	mapstart = max(reserved_end, start);
	}

	if (min_low_pfn >= max_low_pfn)
	panic("Incorrect memory mapping !!!");
	if (min_low_pfn > ARCH_PFN_OFFSET) {
	printk(KERN_INFO
	"Wasting %lu bytes for tracking %lu unused pages\n",
	(min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
	min_low_pfn - ARCH_PFN_OFFSET);
	} else if (min_low_pfn < ARCH_PFN_OFFSET) {
	printk(KERN_INFO
	"%lu free pages won't be used\n",
	ARCH_PFN_OFFSET - min_low_pfn);
	}
	min_low_pfn = ARCH_PFN_OFFSET;

	/*
	* Determine low and high memory ranges
	*/
	if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
	#ifdef CONFIG_HIGHMEM
	highstart_pfn = PFN_DOWN(HIGHMEM_START);
	highend_pfn = max_low_pfn;
	#endif
	max_low_pfn = PFN_DOWN(HIGHMEM_START);
	}

	/*
	* Initialize the boot-time allocator with low memory only.
	*/
	bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
	min_low_pfn, max_low_pfn);


	for (i = 0; i < boot_mem_map.nr_map; i++) {
	unsigned long start, end;

	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 <= min_low_pfn)
	start = min_low_pfn;
	if (start >= end)
	continue;

	#ifndef CONFIG_HIGHMEM
	if (end > max_low_pfn)
	end = max_low_pfn;

	/*
	* ... finally, is the area going away?
	*/
	if (end <= start)
	continue;
	#endif

	add_active_range(0, start, end);
	}

	/*
	* Register fully available low RAM pages with the bootmem allocator.
	*/
	for (i = 0; i < boot_mem_map.nr_map; i++) {
	unsigned long start, end, size;

	/*
	* Reserve usable memory.
	*/
	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);
	/*
	* We are rounding up the start address of usable memory
	* and at the end of the usable range downwards.
	*/
	if (start >= max_low_pfn)
	continue;
	if (start < reserved_end)
	start = reserved_end;
	if (end > max_low_pfn)
	end = max_low_pfn;

	/*
	* ... finally, is the area going away?
	*/
	if (end <= start)
	continue;
	size = end - start;

	/* Register lowmem ranges */
	free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
	memory_present(0, start, end);
	}

	/*
	* Reserve the bootmap memory.
	*/
	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);

	/*
	* Reserve initrd memory if needed.
	*/
	finalize_initrd();
	}

	#endif /* CONFIG_SGI_IP27 */

	/*
	* arch_mem_init - initialize memory management subsystem
	*
	* o plat_mem_setup() detects the memory configuration and will record detected
	* memory areas using add_memory_region.
	*
	* At this stage the memory configuration of the system is known to the
	* kernel but generic memory management system is still entirely uninitialized.
	*
	* o bootmem_init()
	* o sparse_init()
	* o paging_init()
	*
	* At this stage the bootmem allocator is ready to use.
	*
	* NOTE: historically plat_mem_setup did the entire platform initialization.
	* This was rather impractical because it meant plat_mem_setup had to
	* get away without any kind of memory allocator. To keep old code from
	* breaking plat_setup was just renamed to plat_setup and a second platform
	* initialization hook for anything else was introduced.
	*/

	static int usermem __initdata = 0;

	static int __init early_parse_mem(char *p)
	{
	unsigned long start, size;

	/*
	* If a user specifies memory size, we
	* blow away any automatically generated
	* size.
	*/
	if (usermem == 0) {
	boot_mem_map.nr_map = 0;
	usermem = 1;
	}
	start = 0;
	size = memparse(p, &p);
	if (*p == '@')
	start = memparse(p + 1, &p);

	add_memory_region(start, size, BOOT_MEM_RAM);
	return 0;
	}
	early_param("mem", early_parse_mem);

	static void __init arch_mem_init(char **cmdline_p)
	{
	extern void plat_mem_setup(void);

	/* call board setup routine */
	plat_mem_setup();

	printk("Determined physical RAM map:\n");
	print_memory_map();

	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);

	*cmdline_p = command_line;

	parse_early_param();

	if (usermem) {
	printk("User-defined physical RAM map:\n");
	print_memory_map();
	}

	bootmem_init();
	sparse_init();
	paging_init();
	}

	static void __init resource_init(void)
	{
	int i;

	if (UNCAC_BASE != IO_BASE)
	return;

	code_resource.start = __pa_symbol(&_text);
	code_resource.end = __pa_symbol(&_etext) - 1;
	data_resource.start = __pa_symbol(&_etext);
	data_resource.end = __pa_symbol(&_edata) - 1;

	/*
	* 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 >= HIGHMEM_START)
	continue;
	if (end >= HIGHMEM_START)
	end = HIGHMEM_START - 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);
	}
	}

	void __init setup_arch(char **cmdline_p)
	{
	cpu_probe();
	prom_init();

	#ifdef CONFIG_EARLY_PRINTK
	{
	extern void setup_early_printk(void);

	setup_early_printk();
	}
	#endif
	cpu_report();
	check_bugs_early();

	#if defined(CONFIG_VT)
	#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
	#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
	#endif
	#endif

	arch_mem_init(cmdline_p);

	resource_init();
	plat_smp_setup();
	}

	static int __init fpu_disable(char *s)
	{
	int i;

	for (i = 0; i < NR_CPUS; i++)
	cpu_data[i].options &= ~MIPS_CPU_FPU;

	return 1;
	}

	__setup("nofpu", fpu_disable);

	static int __init dsp_disable(char *s)
	{
	cpu_data[0].ases &= ~MIPS_ASE_DSP;

	return 1;
	}

	__setup("nodsp", dsp_disable);

	unsigned long kernelsp[NR_CPUS];
	unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;

	#ifdef CONFIG_DEBUG_FS
	struct dentry *mips_debugfs_dir;
	static int __init debugfs_mips(void)
	{
	struct dentry *d;

	d = debugfs_create_dir("mips", NULL);
	if (IS_ERR(d))
	return PTR_ERR(d);
	mips_debugfs_dir = d;
	return 0;
	}
	arch_initcall(debugfs_mips);
	#endif