[net-next-2.6.git] / arch / mips / kernel / setup.c

/*
 * 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/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 <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;

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

static unsigned long __init init_initrd(void)
{
	unsigned long tmp, end, size;
	u32 *initrd_header;

	ROOT_DEV = Root_RAM0;

	/*
	 * 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.
	 */
	size = initrd_end - initrd_start;
	if (initrd_end == 0 || size == 0) {
		initrd_start = 0;
		initrd_end = 0;
	} else
		return initrd_end;

	end = (unsigned long)&_end;
	tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
	if (tmp < 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];
	}
	return initrd_end;
}

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);
	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 highest = 0;
	unsigned long mapstart = -1UL;
	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 = init_initrd();
	reserved_end = PFN_UP(__pa(max(reserved_end, (unsigned long)&_end)));

	/*
	 * 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 > highest)
			highest = end;
		if (end <= reserved_end)
			continue;
		if (start >= mapstart)
			continue;
		mapstart = max(reserved_end, start);
	}

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

	/*
	 * Initialize the boot-time allocator with low memory only.
	 */
	bootmap_size = init_bootmem(mapstart, highest);

	/*
	 * 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);

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

#endif	/* CONFIG_SGI_IP27 */

/*
 * arch_mem_init - initialize memory managment 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 managment 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(saved_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 = 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 >= 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();
	cpu_report();

#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();
#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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1995 Linus Torvalds
	7	* Copyright (C) 1995 Waldorf Electronics
	8	* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle
	9	* Copyright (C) 1996 Stoned Elipot
	10	* Copyright (C) 1999 Silicon Graphics, Inc.
	11	* Copyright (C) 2000 2001, 2002 Maciej W. Rozycki
	12	*/
1da177e4 LT	13	#include <linux/init.h>
1da177e4 LT	14	#include <linux/ioport.h>
1da177e4	15	#include <linux/module.h>
894673ee	16	#include <linux/screen_info.h>
1da177e4 LT	17	#include <linux/bootmem.h>
1da177e4 LT	18	#include <linux/initrd.h>
1da177e4 LT	19	#include <linux/root_dev.h>
	20	#include <linux/highmem.h>
	21	#include <linux/console.h>
22a9835c	22	#include <linux/pfn.h>
1da177e4 LT	23
	24	#include <asm/addrspace.h>
	25	#include <asm/bootinfo.h>
ec74e361	26	#include <asm/cache.h>
1da177e4 LT	27	#include <asm/cpu.h>
	28	#include <asm/sections.h>
	29	#include <asm/setup.h>
	30	#include <asm/system.h>
	31
ec74e361	32	struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
1da177e4 LT	33
	34	EXPORT_SYMBOL(cpu_data);
	35
	36	#ifdef CONFIG_VT
	37	struct screen_info screen_info;
	38	#endif
	39
	40	/*
	41	* Despite it's name this variable is even if we don't have PCI
	42	*/
	43	unsigned int PCI_DMA_BUS_IS_PHYS;
	44
	45	EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
	46
	47	/*
	48	* Setup information
	49	*
	50	* These are initialized so they are in the .data section
	51	*/
ec74e361 RB	52	unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
ec74e361 RB	53	unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
1da177e4 LT	54
	55	EXPORT_SYMBOL(mips_machtype);
	56	EXPORT_SYMBOL(mips_machgroup);
	57
	58	struct boot_mem_map boot_mem_map;
	59
	60	static char command_line[CL_SIZE];
	61	char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
	62
	63	/*
	64	* mips_io_port_base is the begin of the address space to which x86 style
	65	* I/O ports are mapped.
	66	*/
ec74e361	67	const unsigned long mips_io_port_base __read_mostly = -1;
1da177e4 LT	68	EXPORT_SYMBOL(mips_io_port_base);
	69
	70	/*
	71	* isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
	72	* for the processor.
	73	*/
	74	unsigned long isa_slot_offset;
	75	EXPORT_SYMBOL(isa_slot_offset);
	76
	77	static struct resource code_resource = { .name = "Kernel code", };
	78	static struct resource data_resource = { .name = "Kernel data", };
	79
	80	void __init add_memory_region(phys_t start, phys_t size, long type)
	81	{
	82	int x = boot_mem_map.nr_map;
	83	struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
	84
b6f1f0de FBH	85	/* Sanity check */
	86	if (start + size < start) {
	87	printk("Trying to add an invalid memory region, skipped\n");
	88	return;
	89	}
	90
1da177e4 LT	91	/*
	92	* Try to merge with previous entry if any. This is far less than
	93	* perfect but is sufficient for most real world cases.
	94	*/
	95	if (x && prev->addr + prev->size == start && prev->type == type) {
	96	prev->size += size;
	97	return;
	98	}
	99
	100	if (x == BOOT_MEM_MAP_MAX) {
	101	printk("Ooops! Too many entries in the memory map!\n");
	102	return;
	103	}
	104
	105	boot_mem_map.map[x].addr = start;
	106	boot_mem_map.map[x].size = size;
	107	boot_mem_map.map[x].type = type;
	108	boot_mem_map.nr_map++;
	109	}
	110
	111	static void __init print_memory_map(void)
	112	{
	113	int i;
	114	const int field = 2 * sizeof(unsigned long);
	115
	116	for (i = 0; i < boot_mem_map.nr_map; i++) {
	117	printk(" memory: %0Lx @ %0Lx ",
	118	field, (unsigned long long) boot_mem_map.map[i].size,
	119	field, (unsigned long long) boot_mem_map.map[i].addr);
	120
	121	switch (boot_mem_map.map[i].type) {
	122	case BOOT_MEM_RAM:
	123	printk("(usable)\n");
	124	break;
	125	case BOOT_MEM_ROM_DATA:
	126	printk("(ROM data)\n");
	127	break;
	128	case BOOT_MEM_RESERVED:
	129	printk("(reserved)\n");
	130	break;
	131	default:
	132	printk("type %lu\n", boot_mem_map.map[i].type);
	133	break;
	134	}
	135	}
	136	}
	137
d2043ca8 FBH	138	/*
	139	* Manage initrd
	140	*/
	141	#ifdef CONFIG_BLK_DEV_INITRD
	142
a09fc446	143	static int __init rd_start_early(char *p)
1da177e4	144	{
a09fc446	145	unsigned long start = memparse(p, &p);
1da177e4	146
875d43e7	147	#ifdef CONFIG_64BIT
1da177e4 LT	148	/* HACK: Guess if the sign extension was forgotten */
1da177e4 LT	149	if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
460c0422	150	start \|= 0xffffffff00000000UL;
1da177e4	151	#endif
a09fc446 FBH	152	initrd_start = start;
	153	initrd_end += start;
	154
	155	return 0;
	156	}
	157	early_param("rd_start", rd_start_early);
	158
	159	static int __init rd_size_early(char *p)
	160	{
	161	initrd_end += memparse(p, &p);
1da177e4	162
1da177e4 LT	163	return 0;
1da177e4 LT	164	}
a09fc446	165	early_param("rd_size", rd_size_early);
1da177e4	166
d2043ca8 FBH	167	static unsigned long __init init_initrd(void)
d2043ca8 FBH	168	{
a09fc446	169	unsigned long tmp, end, size;
d2043ca8 FBH	170	u32 *initrd_header;
	171
	172	ROOT_DEV = Root_RAM0;
	173
d2043ca8	174	/*
a09fc446 FBH	175	* Board specific code or command line parser should have
	176	* already set up initrd_start and initrd_end. In these cases
	177	* perfom sanity checks and use them if all looks good.
d2043ca8	178	*/
a09fc446 FBH	179	size = initrd_end - initrd_start;
	180	if (initrd_end == 0 \|\| size == 0) {
	181	initrd_start = 0;
	182	initrd_end = 0;
	183	} else
	184	return initrd_end;
	185
d2043ca8 FBH	186	end = (unsigned long)&_end;
	187	tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
	188	if (tmp < end)
	189	tmp += PAGE_SIZE;
	190
	191	initrd_header = (u32 *)tmp;
	192	if (initrd_header[0] == 0x494E5244) {
	193	initrd_start = (unsigned long)&initrd_header[2];
	194	initrd_end = initrd_start + initrd_header[1];
	195	}
	196	return initrd_end;
	197	}
	198
	199	static void __init finalize_initrd(void)
	200	{
	201	unsigned long size = initrd_end - initrd_start;
	202
	203	if (size == 0) {
	204	printk(KERN_INFO "Initrd not found or empty");
	205	goto disable;
	206	}
d4df6d4e	207	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
d2043ca8 FBH	208	printk("Initrd extends beyond end of memory");
	209	goto disable;
	210	}
	211
d4df6d4e	212	reserve_bootmem(__pa(initrd_start), size);
d2043ca8 FBH	213	initrd_below_start_ok = 1;
	214
	215	printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
	216	initrd_start, size);
	217	return;
	218	disable:
	219	printk(" - disabling initrd\n");
	220	initrd_start = 0;
	221	initrd_end = 0;
	222	}
	223
	224	#else /* !CONFIG_BLK_DEV_INITRD */
	225
9ba126cf RB	226	static unsigned long __init init_initrd(void)
	227	{
	228	return 0;
	229	}
	230
d2043ca8 FBH	231	#define finalize_initrd() do {} while (0)
	232
	233	#endif
	234
b6f1f0de FBH	235	/*
	236	* Initialize the bootmem allocator. It also setup initrd related data
	237	* if needed.
	238	*/
d2043ca8 FBH	239	#ifdef CONFIG_SGI_IP27
d2043ca8 FBH	240
b6f1f0de	241	static void __init bootmem_init(void)
1da177e4	242	{
d2043ca8 FBH	243	init_initrd();
	244	finalize_initrd();
	245	}
	246
	247	#else /* !CONFIG_SGI_IP27 */
	248
	249	static void __init bootmem_init(void)
	250	{
	251	unsigned long reserved_end;
b6f1f0de FBH	252	unsigned long highest = 0;
b6f1f0de FBH	253	unsigned long mapstart = -1UL;
1da177e4 LT	254	unsigned long bootmap_size;
1da177e4 LT	255	int i;
1da177e4 LT	256
1da177e4 LT	257	/*
d2043ca8 FBH	258	* Init any data related to initrd. It's a nop if INITRD is
	259	* not selected. Once that done we can determine the low bound
	260	* of usable memory.
1da177e4	261	*/
d2043ca8	262	reserved_end = init_initrd();
d4df6d4e	263	reserved_end = PFN_UP(__pa(max(reserved_end, (unsigned long)&_end)));
1da177e4	264
b6f1f0de FBH	265	/*
	266	* Find the highest page frame number we have available.
	267	*/
1da177e4 LT	268	for (i = 0; i < boot_mem_map.nr_map; i++) {
	269	unsigned long start, end;
	270
	271	if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
	272	continue;
	273
	274	start = PFN_UP(boot_mem_map.map[i].addr);
	275	end = PFN_DOWN(boot_mem_map.map[i].addr
b6f1f0de	276	+ boot_mem_map.map[i].size);
1da177e4	277
b6f1f0de FBH	278	if (end > highest)
	279	highest = end;
	280	if (end <= reserved_end)
1da177e4	281	continue;
b6f1f0de FBH	282	if (start >= mapstart)
	283	continue;
	284	mapstart = max(reserved_end, start);
1da177e4 LT	285	}
	286
	287	/*
	288	* Determine low and high memory ranges
	289	*/
b6f1f0de FBH	290	if (highest > PFN_DOWN(HIGHMEM_START)) {
	291	#ifdef CONFIG_HIGHMEM
	292	highstart_pfn = PFN_DOWN(HIGHMEM_START);
	293	highend_pfn = highest;
1da177e4	294	#endif
b6f1f0de	295	highest = PFN_DOWN(HIGHMEM_START);
1da177e4 LT	296	}
1da177e4 LT	297
1da177e4	298	/*
b6f1f0de	299	* Initialize the boot-time allocator with low memory only.
1da177e4	300	*/
b6f1f0de	301	bootmap_size = init_bootmem(mapstart, highest);
1da177e4 LT	302
	303	/*
	304	* Register fully available low RAM pages with the bootmem allocator.
	305	*/
	306	for (i = 0; i < boot_mem_map.nr_map; i++) {
b6f1f0de	307	unsigned long start, end, size;
1da177e4 LT	308
	309	/*
	310	* Reserve usable memory.
	311	*/
	312	if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
	313	continue;
	314
b6f1f0de FBH	315	start = PFN_UP(boot_mem_map.map[i].addr);
b6f1f0de FBH	316	end = PFN_DOWN(boot_mem_map.map[i].addr
1da177e4	317	+ boot_mem_map.map[i].size);
1da177e4	318	/*
b6f1f0de FBH	319	* We are rounding up the start address of usable memory
b6f1f0de FBH	320	* and at the end of the usable range downwards.
1da177e4	321	*/
b6f1f0de	322	if (start >= max_low_pfn)
1da177e4	323	continue;
b6f1f0de FBH	324	if (start < reserved_end)
	325	start = reserved_end;
	326	if (end > max_low_pfn)
	327	end = max_low_pfn;
1da177e4 LT	328
1da177e4 LT	329	/*
b6f1f0de	330	* ... finally, is the area going away?
1da177e4	331	*/
b6f1f0de	332	if (end <= start)
1da177e4	333	continue;
b6f1f0de	334	size = end - start;
1da177e4 LT	335
1da177e4 LT	336	/* Register lowmem ranges */
b6f1f0de FBH	337	free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
b6f1f0de FBH	338	memory_present(0, start, end);
1da177e4 LT	339	}
1da177e4 LT	340
b6f1f0de FBH	341	/*
	342	* Reserve the bootmap memory.
	343	*/
	344	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
	345
d2043ca8 FBH	346	/*
	347	* Reserve initrd memory if needed.
	348	*/
	349	finalize_initrd();
1da177e4 LT	350	}
1da177e4 LT	351
d2043ca8 FBH	352	#endif /* CONFIG_SGI_IP27 */
d2043ca8 FBH	353
2925aba4 RB	354	/*
	355	* arch_mem_init - initialize memory managment subsystem
	356	*
	357	* o plat_mem_setup() detects the memory configuration and will record detected
	358	* memory areas using add_memory_region.
2925aba4 RB	359	*
	360	* At this stage the memory configuration of the system is known to the
	361	* kernel but generic memory managment system is still entirely uninitialized.
	362	*
	363	* o bootmem_init()
	364	* o sparse_init()
	365	* o paging_init()
	366	*
	367	* At this stage the bootmem allocator is ready to use.
	368	*
	369	* NOTE: historically plat_mem_setup did the entire platform initialization.
	370	* This was rather impractical because it meant plat_mem_setup had to
	371	* get away without any kind of memory allocator. To keep old code from
	372	* breaking plat_setup was just renamed to plat_setup and a second platform
	373	* initialization hook for anything else was introduced.
	374	*/
	375
a09fc446 FBH	376	static int usermem __initdata = 0;
	377
	378	static int __init early_parse_mem(char *p)
	379	{
	380	unsigned long start, size;
	381
	382	/*
	383	* If a user specifies memory size, we
	384	* blow away any automatically generated
	385	* size.
	386	*/
	387	if (usermem == 0) {
	388	boot_mem_map.nr_map = 0;
	389	usermem = 1;
	390	}
	391	start = 0;
	392	size = memparse(p, &p);
	393	if (*p == '@')
	394	start = memparse(p + 1, &p);
	395
	396	add_memory_region(start, size, BOOT_MEM_RAM);
	397	return 0;
	398	}
	399	early_param("mem", early_parse_mem);
2925aba4 RB	400
	401	static void __init arch_mem_init(char **cmdline_p)
	402	{
a09fc446 FBH	403	extern void plat_mem_setup(void);
a09fc446 FBH	404
2925aba4 RB	405	/* call board setup routine */
	406	plat_mem_setup();
	407
a09fc446 FBH	408	printk("Determined physical RAM map:\n");
	409	print_memory_map();
	410
2925aba4 RB	411	strlcpy(command_line, arcs_cmdline, sizeof(command_line));
	412	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
	413
	414	*cmdline_p = command_line;
	415
a09fc446 FBH	416	parse_early_param();
	417
	418	if (usermem) {
	419	printk("User-defined physical RAM map:\n");
	420	print_memory_map();
	421	}
	422
2925aba4 RB	423	bootmem_init();
	424	sparse_init();
	425	paging_init();
	426	}
	427
8df32c63	428	static void __init resource_init(void)
1da177e4 LT	429	{
	430	int i;
	431
6adb5fe7 RB	432	if (UNCAC_BASE != IO_BASE)
	433	return;
	434
1da177e4 LT	435	code_resource.start = virt_to_phys(&_text);
	436	code_resource.end = virt_to_phys(&_etext) - 1;
	437	data_resource.start = virt_to_phys(&_etext);
	438	data_resource.end = virt_to_phys(&_edata) - 1;
1da177e4 LT	439
	440	/*
	441	* Request address space for all standard RAM.
	442	*/
	443	for (i = 0; i < boot_mem_map.nr_map; i++) {
	444	struct resource *res;
	445	unsigned long start, end;
	446
	447	start = boot_mem_map.map[i].addr;
	448	end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
1c6fd44d	449	if (start >= HIGHMEM_START)
1da177e4	450	continue;
1c6fd44d FBH	451	if (end >= HIGHMEM_START)
1c6fd44d FBH	452	end = HIGHMEM_START - 1;
1da177e4 LT	453
	454	res = alloc_bootmem(sizeof(struct resource));
	455	switch (boot_mem_map.map[i].type) {
	456	case BOOT_MEM_RAM:
	457	case BOOT_MEM_ROM_DATA:
	458	res->name = "System RAM";
	459	break;
	460	case BOOT_MEM_RESERVED:
	461	default:
	462	res->name = "reserved";
	463	}
	464
	465	res->start = start;
	466	res->end = end;
	467
	468	res->flags = IORESOURCE_MEM \| IORESOURCE_BUSY;
	469	request_resource(&iomem_resource, res);
	470
	471	/*
	472	* We don't know which RAM region contains kernel data,
	473	* so we try it repeatedly and let the resource manager
	474	* test it.
	475	*/
	476	request_resource(res, &code_resource);
	477	request_resource(res, &data_resource);
	478	}
	479	}
	480
1da177e4 LT	481	void __init setup_arch(char **cmdline_p)
	482	{
	483	cpu_probe();
	484	prom_init();
	485	cpu_report();
	486
	487	#if defined(CONFIG_VT)
	488	#if defined(CONFIG_VGA_CONSOLE)
	489	conswitchp = &vga_con;
	490	#elif defined(CONFIG_DUMMY_CONSOLE)
	491	conswitchp = &dummy_con;
	492	#endif
	493	#endif
	494
2925aba4	495	arch_mem_init(cmdline_p);
1da177e4	496
1da177e4	497	resource_init();
9b6695a8 RB	498	#ifdef CONFIG_SMP
	499	plat_smp_setup();
	500	#endif
1da177e4 LT	501	}
	502
	503	int __init fpu_disable(char *s)
	504	{
f088fc84 RB	505	int i;
	506
	507	for (i = 0; i < NR_CPUS; i++)
	508	cpu_data[i].options &= ~MIPS_CPU_FPU;
1da177e4 LT	509
	510	return 1;
	511	}
	512
	513	__setup("nofpu", fpu_disable);
e50c0a8f RB	514
	515	int __init dsp_disable(char *s)
	516	{
	517	cpu_data[0].ases &= ~MIPS_ASE_DSP;
	518
	519	return 1;
	520	}
	521
	522	__setup("nodsp", dsp_disable);