arch/mips/kernel/setup.c - kernel/msm - Gitiles

 /*
  * 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 <linux/pfn.h>

 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>
 #include <asm/cache.h>
 #include <asm/cpu.h>
 #include <asm/sections.h>
 #include <asm/setup.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;
 unsigned long mips_machgroup __read_mostly = 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 __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;

 	/*
 	 * 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_64BIT
 	/* HACK: Guess if the sign extension was forgotten */
 	if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
 		start |= 0xffffffff00000000UL;
 #endif

 	end = start + size;
 	if (start && end) {
 		*rd_start = start;
 		*rd_end = end;
 		return 1;
 	}
 	return 0;
 }

 #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

 	/* 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));
 		memory_present(0, curr_pfn, curr_pfn + size - 1);
 	}

 	/* 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);
 		const int width = sizeof(long) * 2;

 		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",
 			       width,
 			       (unsigned long long) CPHYSADDR(initrd_end),
 			       width,
 			       (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;

 	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;

 	/*
 	 * 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 MAXMEM
 #undef MAXMEM_PFN

 extern void plat_setup(void);

 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 */
 	plat_setup();

 	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();
 #ifdef CONFIG_SMP
 	plat_smp_setup();
 #endif
 }

 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);

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

 	return 1;
 }

 __setup("nodsp", dsp_disable);
	/*
	* 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 <linux/pfn.h>

	#include <asm/addrspace.h>
	#include <asm/bootinfo.h>
	#include <asm/cache.h>
	#include <asm/cpu.h>
	#include <asm/sections.h>
	#include <asm/setup.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;
	unsigned long mips_machgroup __read_mostly = 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 __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;

	/*
	* 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;
	}
	}
	}

	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_64BIT
	/* HACK: Guess if the sign extension was forgotten */
	if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
	start \|= 0xffffffff00000000UL;
	#endif

	end = start + size;
	if (start && end) {
	*rd_start = start;
	*rd_end = end;
	return 1;
	}
	return 0;
	}

	#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

	/* 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));
	memory_present(0, curr_pfn, curr_pfn + size - 1);
	}

	/* 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);
	const int width = sizeof(long) * 2;

	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%0Lx > 0x%0Lx)\ndisabling initrd\n",
	width,
	(unsigned long long) CPHYSADDR(initrd_end),
	width,
	(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;

	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;

	/*
	* 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 MAXMEM
	#undef MAXMEM_PFN

	extern void plat_setup(void);

	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 */
	plat_setup();

	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();
	#ifdef CONFIG_SMP
	plat_smp_setup();
	#endif
	}

	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);

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

	return 1;
	}

	__setup("nodsp", dsp_disable);