[deliverable/linux.git] / arch / um / kernel / um_arch.c

/*
 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include "linux/delay.h"
#include "linux/mm.h"
#include "linux/module.h"
#include "linux/seq_file.h"
#include "linux/string.h"
#include "linux/utsname.h"
#include "asm/pgtable.h"
#include "asm/processor.h"
#include "asm/setup.h"
#include "arch.h"
#include "as-layout.h"
#include "init.h"
#include "kern.h"
#include "mem_user.h"
#include "os.h"
#include "skas.h"

#define DEFAULT_COMMAND_LINE "root=98:0"

/* Changed in add_arg and setup_arch, which run before SMP is started */
static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };

static void __init add_arg(char *arg)
{
	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
		printf("add_arg: Too many command line arguments!\n");
		exit(1);
	}
	if (strlen(command_line) > 0)
		strcat(command_line, " ");
	strcat(command_line, arg);
}

/*
 * These fields are initialized at boot time and not changed.
 * XXX This structure is used only in the non-SMP case.  Maybe this
 * should be moved to smp.c.
 */
struct cpuinfo_um boot_cpu_data = {
	.loops_per_jiffy	= 0,
	.ipi_pipe		= { -1, -1 }
};

unsigned long thread_saved_pc(struct task_struct *task)
{
	/* FIXME: Need to look up userspace_pid by cpu */
	return os_process_pc(userspace_pid[0]);
}

/* Changed in setup_arch, which is called in early boot */
static char host_info[(__NEW_UTS_LEN + 1) * 5];

static int show_cpuinfo(struct seq_file *m, void *v)
{
	int index = 0;

#ifdef CONFIG_SMP
	index = (struct cpuinfo_um *) v - cpu_data;
	if (!cpu_online(index))
		return 0;
#endif

	seq_printf(m, "processor\t: %d\n", index);
	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	seq_printf(m, "model name\t: UML\n");
	seq_printf(m, "mode\t\t: skas\n");
	seq_printf(m, "host\t\t: %s\n", host_info);
	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
		   loops_per_jiffy/(500000/HZ),
		   (loops_per_jiffy/(5000/HZ)) % 100);

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};

/* Set in linux_main */
unsigned long host_task_size;
unsigned long task_size;
unsigned long uml_physmem;
unsigned long uml_reserved; /* Also modified in mem_init */
unsigned long start_vm;
unsigned long end_vm;

/* Set in uml_ncpus_setup */
int ncpus = 1;

/* Set in early boot */
static int have_root __initdata = 0;

/* Set in uml_mem_setup and modified in linux_main */
long long physmem_size = 32 * 1024 * 1024;

static char *usage_string =
"User Mode Linux v%s\n"
"	available at http://user-mode-linux.sourceforge.net/\n\n";

static int __init uml_version_setup(char *line, int *add)
{
	printf("%s\n", init_utsname()->release);
	exit(0);

	return 0;
}

__uml_setup("--version", uml_version_setup,
"--version\n"
"    Prints the version number of the kernel.\n\n"
);

static int __init uml_root_setup(char *line, int *add)
{
	have_root = 1;
	return 0;
}

__uml_setup("root=", uml_root_setup,
"root=<file containing the root fs>\n"
"    This is actually used by the generic kernel in exactly the same\n"
"    way as in any other kernel. If you configure a number of block\n"
"    devices and want to boot off something other than ubd0, you \n"
"    would use something like:\n"
"        root=/dev/ubd5\n\n"
);

static int __init no_skas_debug_setup(char *line, int *add)
{
	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
	printf("'gdb linux'");

	return 0;
}

__uml_setup("debug", no_skas_debug_setup,
"debug\n"
"    this flag is not needed to run gdb on UML in skas mode\n\n"
);

#ifdef CONFIG_SMP
static int __init uml_ncpus_setup(char *line, int *add)
{
	if (!sscanf(line, "%d", &ncpus)) {
		printf("Couldn't parse [%s]\n", line);
		return -1;
	}

	return 0;
}

__uml_setup("ncpus=", uml_ncpus_setup,
"ncpus=<# of desired CPUs>\n"
"    This tells an SMP kernel how many virtual processors to start.\n\n"
);
#endif

static int __init Usage(char *line, int *add)
{
	const char **p;

	printf(usage_string, init_utsname()->release);
	p = &__uml_help_start;
	while (p < &__uml_help_end) {
		printf("%s", *p);
		p++;
	}
	exit(0);
	return 0;
}

__uml_setup("--help", Usage,
"--help\n"
"    Prints this message.\n\n"
);

static int __init uml_checksetup(char *line, int *add)
{
	struct uml_param *p;

	p = &__uml_setup_start;
	while(p < &__uml_setup_end) {
		int n;

		n = strlen(p->str);
		if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
			return 1;
		p++;
	}
	return 0;
}

static void __init uml_postsetup(void)
{
	initcall_t *p;

	p = &__uml_postsetup_start;
	while(p < &__uml_postsetup_end) {
		(*p)();
		p++;
	}
	return;
}

/* Set during early boot */
unsigned long brk_start;
unsigned long end_iomem;
EXPORT_SYMBOL(end_iomem);

#define MIN_VMALLOC (32 * 1024 * 1024)

extern char __binary_start;

static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
{
	/* Round up to the nearest 4M */
	unsigned long host_task_size = ROUND_4M((unsigned long)
						&host_task_size);

	if (!skas_needs_stub)
		*task_size_out = host_task_size;
	else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;

	return host_task_size;
}

int __init linux_main(int argc, char **argv)
{
	unsigned long avail, diff;
	unsigned long virtmem_size, max_physmem;
	unsigned int i, add;
	char * mode;

	for (i = 1; i < argc; i++) {
		if ((i == 1) && (argv[i][0] == ' '))
			continue;
		add = 1;
		uml_checksetup(argv[i], &add);
		if (add)
			add_arg(argv[i]);
	}
	if (have_root == 0)
		add_arg(DEFAULT_COMMAND_LINE);

	/* OS sanity checks that need to happen before the kernel runs */
	os_early_checks();

	can_do_skas();

	if (proc_mm && ptrace_faultinfo)
		mode = "SKAS3";
	else
		mode = "SKAS0";

	printf("UML running in %s mode\n", mode);

	host_task_size = set_task_sizes_skas(&task_size);

	/*
	 * Setting up handlers to 'sig_info' struct
	 */
	os_fill_handlinfo(handlinfo_kern);

	brk_start = (unsigned long) sbrk(0);

	/*
	 * Increase physical memory size for exec-shield users
	 * so they actually get what they asked for. This should
	 * add zero for non-exec shield users
	 */

	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	if (diff > 1024 * 1024) {
		printf("Adding %ld bytes to physical memory to account for "
		       "exec-shield gap\n", diff);
		physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	}

	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;

	/* Reserve up to 4M after the current brk */
	uml_reserved = ROUND_4M(brk_start) + (1 << 22);

	setup_machinename(init_utsname()->machine);

	highmem = 0;
	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;

	/*
	 * Zones have to begin on a 1 << MAX_ORDER page boundary,
	 * so this makes sure that's true for highmem
	 */
	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
	if (physmem_size + iomem_size > max_physmem) {
		highmem = physmem_size + iomem_size - max_physmem;
		physmem_size -= highmem;
#ifndef CONFIG_HIGHMEM
		highmem = 0;
		printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
		       "to %Lu bytes\n", physmem_size);
#endif
	}

	high_physmem = uml_physmem + physmem_size;
	end_iomem = high_physmem + iomem_size;
	high_memory = (void *) end_iomem;

	start_vm = VMALLOC_START;

	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
	if (init_maps(physmem_size, iomem_size, highmem)) {
		printf("Failed to allocate mem_map for %Lu bytes of physical "
		       "memory and %Lu bytes of highmem\n", physmem_size,
		       highmem);
		exit(1);
	}

	virtmem_size = physmem_size;
	avail = get_kmem_end() - start_vm;
	if (physmem_size > avail)
		virtmem_size = avail;
	end_vm = start_vm + virtmem_size;

	if (virtmem_size < physmem_size)
		printf("Kernel virtual memory size shrunk to %lu bytes\n",
		       virtmem_size);

	uml_postsetup();

	stack_protections((unsigned long) &init_thread_info);
	os_flush_stdout();

	return start_uml();
}

extern int uml_exitcode;

static int panic_exit(struct notifier_block *self, unsigned long unused1,
		      void *unused2)
{
	bust_spinlocks(1);
	show_regs(&(current->thread.regs));
	bust_spinlocks(0);
	uml_exitcode = 1;
	os_dump_core();
	return 0;
}

static struct notifier_block panic_exit_notifier = {
	.notifier_call 		= panic_exit,
	.next 			= NULL,
	.priority 		= 0
};

void __init setup_arch(char **cmdline_p)
{
	atomic_notifier_chain_register(&panic_notifier_list,
			&panic_exit_notifier);
	paging_init();
	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	*cmdline_p = command_line;
	setup_hostinfo(host_info, sizeof host_info);
}

void __init check_bugs(void)
{
	arch_check_bugs();
	os_check_bugs();
}

void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
{
}

#ifdef CONFIG_SMP
void alternatives_smp_module_add(struct module *mod, char *name,
				 void *locks, void *locks_end,
				 void *text,  void *text_end)
{
}

void alternatives_smp_module_del(struct module *mod)
{
}
#endif
Commit	Line	Data
ea2ba7dc	1	/*
ba180fd4	2	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
1da177e4 LT	3	* Licensed under the GPL
	4	*/
	5
1da177e4	6	#include "linux/delay.h"
ba180fd4	7	#include "linux/mm.h"
1da177e4	8	#include "linux/module.h"
ba180fd4 JD	9	#include "linux/seq_file.h"
ba180fd4 JD	10	#include "linux/string.h"
b4ffb6ad	11	#include "linux/utsname.h"
1da177e4	12	#include "asm/pgtable.h"
ba180fd4	13	#include "asm/processor.h"
16c11163	14	#include "asm/setup.h"
eb830759	15	#include "arch.h"
ba180fd4 JD	16	#include "as-layout.h"
ba180fd4 JD	17	#include "init.h"
1da177e4 LT	18	#include "kern.h"
1da177e4 LT	19	#include "mem_user.h"
1da177e4	20	#include "os.h"
cb66504d	21	#include "skas.h"
1da177e4 LT	22
	23	#define DEFAULT_COMMAND_LINE "root=98:0"
	24
1d1497e1	25	/* Changed in add_arg and setup_arch, which run before SMP is started */
7a3a06d0	26	static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
1da177e4	27
7a3a06d0	28	static void __init add_arg(char *arg)
1da177e4 LT	29	{
	30	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	31	printf("add_arg: Too many command line arguments!\n");
	32	exit(1);
	33	}
ba180fd4	34	if (strlen(command_line) > 0)
1da177e4 LT	35	strcat(command_line, " ");
	36	strcat(command_line, arg);
	37	}
	38
1d1497e1 JD	39	/*
	40	* These fields are initialized at boot time and not changed.
	41	* XXX This structure is used only in the non-SMP case. Maybe this
	42	* should be moved to smp.c.
	43	*/
	44	struct cpuinfo_um boot_cpu_data = {
1da177e4 LT	45	.loops_per_jiffy = 0,
	46	.ipi_pipe = { -1, -1 }
	47	};
	48
	49	unsigned long thread_saved_pc(struct task_struct *task)
	50	{
77bf4400 JD	51	/* FIXME: Need to look up userspace_pid by cpu */
77bf4400 JD	52	return os_process_pc(userspace_pid[0]);
1da177e4 LT	53	}
1da177e4 LT	54
b4ffb6ad JD	55	/* Changed in setup_arch, which is called in early boot */
	56	static char host_info[(__NEW_UTS_LEN + 1) * 5];
	57
1da177e4 LT	58	static int show_cpuinfo(struct seq_file m, void v)
	59	{
	60	int index = 0;
	61
	62	#ifdef CONFIG_SMP
	63	index = (struct cpuinfo_um *) v - cpu_data;
	64	if (!cpu_online(index))
	65	return 0;
	66	#endif
	67
	68	seq_printf(m, "processor\t: %d\n", index);
	69	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	70	seq_printf(m, "model name\t: UML\n");
6aa802ce	71	seq_printf(m, "mode\t\t: skas\n");
1da177e4 LT	72	seq_printf(m, "host\t\t: %s\n", host_info);
	73	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	74	loops_per_jiffy/(500000/HZ),
	75	(loops_per_jiffy/(5000/HZ)) % 100);
	76
a5ed1ffa	77	return 0;
1da177e4 LT	78	}
	79
	80	static void c_start(struct seq_file m, loff_t *pos)
	81	{
	82	return pos < NR_CPUS ? cpu_data + pos : NULL;
	83	}
	84
	85	static void c_next(struct seq_file m, void v, loff_t pos)
	86	{
	87	++*pos;
	88	return c_start(m, pos);
	89	}
	90
	91	static void c_stop(struct seq_file m, void v)
	92	{
	93	}
	94
5e7672ec	95	const struct seq_operations cpuinfo_op = {
1da177e4 LT	96	.start = c_start,
	97	.next = c_next,
	98	.stop = c_stop,
	99	.show = show_cpuinfo,
	100	};
	101
1da177e4 LT	102	/* Set in linux_main */
	103	unsigned long host_task_size;
	104	unsigned long task_size;
1da177e4	105	unsigned long uml_physmem;
1d1497e1	106	unsigned long uml_reserved; /* Also modified in mem_init */
1da177e4 LT	107	unsigned long start_vm;
1da177e4 LT	108	unsigned long end_vm;
1d1497e1 JD	109
1d1497e1 JD	110	/* Set in uml_ncpus_setup */
1da177e4 LT	111	int ncpus = 1;
1da177e4 LT	112
1da177e4 LT	113	/* Set in early boot */
1da177e4 LT	114	static int have_root __initdata = 0;
1d1497e1 JD	115
1d1497e1 JD	116	/* Set in uml_mem_setup and modified in linux_main */
ae173816	117	long long physmem_size = 32 * 1024 * 1024;
1da177e4	118
ba180fd4	119	static char *usage_string =
1da177e4 LT	120	"User Mode Linux v%s\n"
	121	" available at http://user-mode-linux.sourceforge.net/\n\n";
	122
	123	static int __init uml_version_setup(char line, int add)
	124	{
96b644bd	125	printf("%s\n", init_utsname()->release);
1da177e4 LT	126	exit(0);
	127
	128	return 0;
	129	}
	130
	131	__uml_setup("--version", uml_version_setup,
	132	"--version\n"
	133	" Prints the version number of the kernel.\n\n"
	134	);
	135
	136	static int __init uml_root_setup(char line, int add)
	137	{
	138	have_root = 1;
	139	return 0;
	140	}
	141
	142	__uml_setup("root=", uml_root_setup,
	143	"root=<file containing the root fs>\n"
	144	" This is actually used by the generic kernel in exactly the same\n"
	145	" way as in any other kernel. If you configure a number of block\n"
	146	" devices and want to boot off something other than ubd0, you \n"
	147	" would use something like:\n"
	148	" root=/dev/ubd5\n\n"
	149	);
	150
fbd55779 JD	151	static int __init no_skas_debug_setup(char line, int add)
	152	{
	153	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
42fda663	154	printf("'gdb linux'");
fbd55779 JD	155
	156	return 0;
	157	}
	158
	159	__uml_setup("debug", no_skas_debug_setup,
	160	"debug\n"
	161	" this flag is not needed to run gdb on UML in skas mode\n\n"
	162	);
	163
1da177e4 LT	164	#ifdef CONFIG_SMP
	165	static int __init uml_ncpus_setup(char line, int add)
	166	{
a5ed1ffa JD	167	if (!sscanf(line, "%d", &ncpus)) {
	168	printf("Couldn't parse [%s]\n", line);
	169	return -1;
	170	}
1da177e4	171
a5ed1ffa	172	return 0;
1da177e4 LT	173	}
	174
	175	__uml_setup("ncpus=", uml_ncpus_setup,
	176	"ncpus=<# of desired CPUs>\n"
ba180fd4	177	" This tells an SMP kernel how many virtual processors to start.\n\n"
1da177e4 LT	178	);
	179	#endif
	180
1da177e4 LT	181	static int __init Usage(char line, int add)
1da177e4 LT	182	{
a5ed1ffa	183	const char **p;
1da177e4	184
96b644bd	185	printf(usage_string, init_utsname()->release);
a5ed1ffa JD	186	p = &__uml_help_start;
	187	while (p < &__uml_help_end) {
	188	printf("%s", *p);
	189	p++;
	190	}
1da177e4	191	exit(0);
1da177e4 LT	192	return 0;
	193	}
	194
	195	__uml_setup("--help", Usage,
	196	"--help\n"
	197	" Prints this message.\n\n"
	198	);
	199
	200	static int __init uml_checksetup(char line, int add)
	201	{
	202	struct uml_param *p;
	203
	204	p = &__uml_setup_start;
	205	while(p < &__uml_setup_end) {
	206	int n;
	207
	208	n = strlen(p->str);
ba180fd4 JD	209	if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
ba180fd4 JD	210	return 1;
1da177e4 LT	211	p++;
	212	}
	213	return 0;
	214	}
	215
	216	static void __init uml_postsetup(void)
	217	{
	218	initcall_t *p;
	219
	220	p = &__uml_postsetup_start;
ba180fd4	221	while(p < &__uml_postsetup_end) {
1da177e4 LT	222	(*p)();
	223	p++;
	224	}
	225	return;
	226	}
	227
	228	/* Set during early boot */
	229	unsigned long brk_start;
	230	unsigned long end_iomem;
	231	EXPORT_SYMBOL(end_iomem);
	232
	233	#define MIN_VMALLOC (32 * 1024 * 1024)
	234
23bbd586 JD	235	extern char __binary_start;
23bbd586 JD	236
77bf4400 JD	237	static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
	238	{
	239	/* Round up to the nearest 4M */
	240	unsigned long host_task_size = ROUND_4M((unsigned long)
	241	&host_task_size);
	242
	243	if (!skas_needs_stub)
	244	*task_size_out = host_task_size;
	245	else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
	246
	247	return host_task_size;
	248	}
	249
7a3a06d0	250	int __init linux_main(int argc, char **argv)
1da177e4 LT	251	{
	252	unsigned long avail, diff;
	253	unsigned long virtmem_size, max_physmem;
	254	unsigned int i, add;
cb66504d	255	char * mode;
1da177e4	256
ba180fd4 JD	257	for (i = 1; i < argc; i++) {
	258	if ((i == 1) && (argv[i][0] == ' '))
	259	continue;
1da177e4 LT	260	add = 1;
	261	uml_checksetup(argv[i], &add);
	262	if (add)
	263	add_arg(argv[i]);
	264	}
ba180fd4	265	if (have_root == 0)
1da177e4 LT	266	add_arg(DEFAULT_COMMAND_LINE);
1da177e4 LT	267
ba180fd4	268	/* OS sanity checks that need to happen before the kernel runs */
60d339f6	269	os_early_checks();
cb66504d	270
42fda663 JD	271	can_do_skas();
	272
	273	if (proc_mm && ptrace_faultinfo)
cb66504d PBG	274	mode = "SKAS3";
	275	else
	276	mode = "SKAS0";
cb66504d PBG	277
	278	printf("UML running in %s mode\n", mode);
	279
6aa802ce	280	host_task_size = set_task_sizes_skas(&task_size);
1da177e4	281
ea2ba7dc	282	/*
a5ed1ffa JD	283	* Setting up handlers to 'sig_info' struct
a5ed1ffa JD	284	*/
ea2ba7dc GS	285	os_fill_handlinfo(handlinfo_kern);
ea2ba7dc GS	286
1da177e4	287	brk_start = (unsigned long) sbrk(0);
77bf4400	288
ba180fd4 JD	289	/*
	290	* Increase physical memory size for exec-shield users
	291	* so they actually get what they asked for. This should
	292	* add zero for non-exec shield users
	293	*/
1da177e4 LT	294
1da177e4 LT	295	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
ba180fd4	296	if (diff > 1024 * 1024) {
1da177e4 LT	297	printf("Adding %ld bytes to physical memory to account for "
	298	"exec-shield gap\n", diff);
	299	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	300	}
	301
1d1497e1	302	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
1da177e4 LT	303
	304	/* Reserve up to 4M after the current brk */
	305	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	306
96b644bd	307	setup_machinename(init_utsname()->machine);
1da177e4	308
1da177e4 LT	309	highmem = 0;
	310	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	311	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
	312
ba180fd4 JD	313	/*
ba180fd4 JD	314	* Zones have to begin on a 1 << MAX_ORDER page boundary,
1da177e4 LT	315	* so this makes sure that's true for highmem
	316	*/
	317	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
ba180fd4	318	if (physmem_size + iomem_size > max_physmem) {
1da177e4 LT	319	highmem = physmem_size + iomem_size - max_physmem;
	320	physmem_size -= highmem;
	321	#ifndef CONFIG_HIGHMEM
	322	highmem = 0;
	323	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
d9f8b62a	324	"to %Lu bytes\n", physmem_size);
1da177e4 LT	325	#endif
	326	}
	327
	328	high_physmem = uml_physmem + physmem_size;
	329	end_iomem = high_physmem + iomem_size;
	330	high_memory = (void *) end_iomem;
	331
	332	start_vm = VMALLOC_START;
	333
	334	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
ba180fd4	335	if (init_maps(physmem_size, iomem_size, highmem)) {
d9f8b62a JD	336	printf("Failed to allocate mem_map for %Lu bytes of physical "
d9f8b62a JD	337	"memory and %Lu bytes of highmem\n", physmem_size,
1da177e4 LT	338	highmem);
	339	exit(1);
	340	}
	341
	342	virtmem_size = physmem_size;
	343	avail = get_kmem_end() - start_vm;
ba180fd4 JD	344	if (physmem_size > avail)
ba180fd4 JD	345	virtmem_size = avail;
1da177e4 LT	346	end_vm = start_vm + virtmem_size;
1da177e4 LT	347
ba180fd4	348	if (virtmem_size < physmem_size)
ae173816	349	printf("Kernel virtual memory size shrunk to %lu bytes\n",
1da177e4 LT	350	virtmem_size);
1da177e4 LT	351
a5ed1ffa	352	uml_postsetup();
1da177e4	353
57598fd7	354	stack_protections((unsigned long) &init_thread_info);
1da177e4 LT	355	os_flush_stdout();
1da177e4 LT	356
77bf4400	357	return start_uml();
1da177e4 LT	358	}
	359
	360	extern int uml_exitcode;
	361
	362	static int panic_exit(struct notifier_block *self, unsigned long unused1,
	363	void *unused2)
	364	{
	365	bust_spinlocks(1);
	366	show_regs(&(current->thread.regs));
	367	bust_spinlocks(0);
	368	uml_exitcode = 1;
63843c26	369	os_dump_core();
a5ed1ffa	370	return 0;
1da177e4 LT	371	}
	372
	373	static struct notifier_block panic_exit_notifier = {
	374	.notifier_call = panic_exit,
	375	.next = NULL,
	376	.priority = 0
	377	};
	378
	379	void __init setup_arch(char **cmdline_p)
	380	{
e041c683 AS	381	atomic_notifier_chain_register(&panic_notifier_list,
e041c683 AS	382	&panic_exit_notifier);
1da177e4	383	paging_init();
19bf7e7a	384	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
a5ed1ffa	385	*cmdline_p = command_line;
b4ffb6ad	386	setup_hostinfo(host_info, sizeof host_info);
1da177e4 LT	387	}
	388
	389	void __init check_bugs(void)
	390	{
	391	arch_check_bugs();
a5ed1ffa	392	os_check_bugs();
1da177e4 LT	393	}
1da177e4 LT	394
9a0b5817 GH	395	void apply_alternatives(struct alt_instr start, struct alt_instr end)
	396	{
	397	}
	398
c61a8416	399	#ifdef CONFIG_SMP
9a0b5817 GH	400	void alternatives_smp_module_add(struct module mod, char name,
	401	void locks, void locks_end,
	402	void text, void text_end)
	403	{
	404	}
	405
	406	void alternatives_smp_module_del(struct module *mod)
1da177e4 LT	407	{
1da177e4 LT	408	}
c61a8416	409	#endif