[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 "kern_util.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 = 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);

	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	18	#include "kern.h"
edea1385	19	#include "kern_util.h"
1da177e4	20	#include "mem_user.h"
1da177e4	21	#include "os.h"
cb66504d	22	#include "skas.h"
1da177e4 LT	23
	24	#define DEFAULT_COMMAND_LINE "root=98:0"
	25
1d1497e1	26	/* Changed in add_arg and setup_arch, which run before SMP is started */
7a3a06d0	27	static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
1da177e4	28
7a3a06d0	29	static void __init add_arg(char *arg)
1da177e4 LT	30	{
	31	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	32	printf("add_arg: Too many command line arguments!\n");
	33	exit(1);
	34	}
ba180fd4	35	if (strlen(command_line) > 0)
1da177e4 LT	36	strcat(command_line, " ");
	37	strcat(command_line, arg);
	38	}
	39
1d1497e1 JD	40	/*
	41	* These fields are initialized at boot time and not changed.
	42	* XXX This structure is used only in the non-SMP case. Maybe this
	43	* should be moved to smp.c.
	44	*/
	45	struct cpuinfo_um boot_cpu_data = {
1da177e4 LT	46	.loops_per_jiffy = 0,
	47	.ipi_pipe = { -1, -1 }
	48	};
	49
	50	unsigned long thread_saved_pc(struct task_struct *task)
	51	{
77bf4400 JD	52	/* FIXME: Need to look up userspace_pid by cpu */
77bf4400 JD	53	return os_process_pc(userspace_pid[0]);
1da177e4 LT	54	}
1da177e4 LT	55
b4ffb6ad JD	56	/* Changed in setup_arch, which is called in early boot */
	57	static char host_info[(__NEW_UTS_LEN + 1) * 5];
	58
1da177e4 LT	59	static int show_cpuinfo(struct seq_file m, void v)
	60	{
	61	int index = 0;
	62
	63	#ifdef CONFIG_SMP
	64	index = (struct cpuinfo_um *) v - cpu_data;
	65	if (!cpu_online(index))
	66	return 0;
	67	#endif
	68
	69	seq_printf(m, "processor\t: %d\n", index);
	70	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	71	seq_printf(m, "model name\t: UML\n");
6aa802ce	72	seq_printf(m, "mode\t\t: skas\n");
1da177e4 LT	73	seq_printf(m, "host\t\t: %s\n", host_info);
	74	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	75	loops_per_jiffy/(500000/HZ),
	76	(loops_per_jiffy/(5000/HZ)) % 100);
	77
a5ed1ffa	78	return 0;
1da177e4 LT	79	}
	80
	81	static void c_start(struct seq_file m, loff_t *pos)
	82	{
	83	return pos < NR_CPUS ? cpu_data + pos : NULL;
	84	}
	85
	86	static void c_next(struct seq_file m, void v, loff_t pos)
	87	{
	88	++*pos;
	89	return c_start(m, pos);
	90	}
	91
	92	static void c_stop(struct seq_file m, void v)
	93	{
	94	}
	95
5e7672ec	96	const struct seq_operations cpuinfo_op = {
1da177e4 LT	97	.start = c_start,
	98	.next = c_next,
	99	.stop = c_stop,
	100	.show = show_cpuinfo,
	101	};
	102
1da177e4 LT	103	/* Set in linux_main */
	104	unsigned long host_task_size;
	105	unsigned long task_size;
1da177e4	106	unsigned long uml_physmem;
1d1497e1	107	unsigned long uml_reserved; /* Also modified in mem_init */
1da177e4 LT	108	unsigned long start_vm;
1da177e4 LT	109	unsigned long end_vm;
1d1497e1 JD	110
1d1497e1 JD	111	/* Set in uml_ncpus_setup */
1da177e4 LT	112	int ncpus = 1;
1da177e4 LT	113
1da177e4 LT	114	/* Set in early boot */
1da177e4 LT	115	static int have_root __initdata = 0;
1d1497e1 JD	116
1d1497e1 JD	117	/* Set in uml_mem_setup and modified in linux_main */
ae173816	118	long long physmem_size = 32 * 1024 * 1024;
1da177e4	119
ba180fd4	120	static char *usage_string =
1da177e4 LT	121	"User Mode Linux v%s\n"
	122	" available at http://user-mode-linux.sourceforge.net/\n\n";
	123
	124	static int __init uml_version_setup(char line, int add)
	125	{
96b644bd	126	printf("%s\n", init_utsname()->release);
1da177e4 LT	127	exit(0);
	128
	129	return 0;
	130	}
	131
	132	__uml_setup("--version", uml_version_setup,
	133	"--version\n"
	134	" Prints the version number of the kernel.\n\n"
	135	);
	136
	137	static int __init uml_root_setup(char line, int add)
	138	{
	139	have_root = 1;
	140	return 0;
	141	}
	142
	143	__uml_setup("root=", uml_root_setup,
	144	"root=<file containing the root fs>\n"
	145	" This is actually used by the generic kernel in exactly the same\n"
	146	" way as in any other kernel. If you configure a number of block\n"
	147	" devices and want to boot off something other than ubd0, you \n"
	148	" would use something like:\n"
	149	" root=/dev/ubd5\n\n"
	150	);
	151
fbd55779 JD	152	static int __init no_skas_debug_setup(char line, int add)
	153	{
	154	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
42fda663	155	printf("'gdb linux'");
fbd55779 JD	156
	157	return 0;
	158	}
	159
	160	__uml_setup("debug", no_skas_debug_setup,
	161	"debug\n"
	162	" this flag is not needed to run gdb on UML in skas mode\n\n"
	163	);
	164
1da177e4 LT	165	#ifdef CONFIG_SMP
	166	static int __init uml_ncpus_setup(char line, int add)
	167	{
a5ed1ffa JD	168	if (!sscanf(line, "%d", &ncpus)) {
	169	printf("Couldn't parse [%s]\n", line);
	170	return -1;
	171	}
1da177e4	172
a5ed1ffa	173	return 0;
1da177e4 LT	174	}
	175
	176	__uml_setup("ncpus=", uml_ncpus_setup,
	177	"ncpus=<# of desired CPUs>\n"
ba180fd4	178	" This tells an SMP kernel how many virtual processors to start.\n\n"
1da177e4 LT	179	);
	180	#endif
	181
1da177e4 LT	182	static int __init Usage(char line, int add)
1da177e4 LT	183	{
a5ed1ffa	184	const char **p;
1da177e4	185
96b644bd	186	printf(usage_string, init_utsname()->release);
a5ed1ffa JD	187	p = &__uml_help_start;
	188	while (p < &__uml_help_end) {
	189	printf("%s", *p);
	190	p++;
	191	}
1da177e4	192	exit(0);
1da177e4 LT	193	return 0;
	194	}
	195
	196	__uml_setup("--help", Usage,
	197	"--help\n"
	198	" Prints this message.\n\n"
	199	);
	200
	201	static int __init uml_checksetup(char line, int add)
	202	{
	203	struct uml_param *p;
	204
	205	p = &__uml_setup_start;
	206	while(p < &__uml_setup_end) {
	207	int n;
	208
	209	n = strlen(p->str);
ba180fd4 JD	210	if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
ba180fd4 JD	211	return 1;
1da177e4 LT	212	p++;
	213	}
	214	return 0;
	215	}
	216
	217	static void __init uml_postsetup(void)
	218	{
	219	initcall_t *p;
	220
	221	p = &__uml_postsetup_start;
ba180fd4	222	while(p < &__uml_postsetup_end) {
1da177e4 LT	223	(*p)();
	224	p++;
	225	}
	226	return;
	227	}
	228
	229	/* Set during early boot */
	230	unsigned long brk_start;
	231	unsigned long end_iomem;
	232	EXPORT_SYMBOL(end_iomem);
	233
	234	#define MIN_VMALLOC (32 * 1024 * 1024)
	235
23bbd586 JD	236	extern char __binary_start;
23bbd586 JD	237
77bf4400 JD	238	static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
	239	{
	240	/* Round up to the nearest 4M */
	241	unsigned long host_task_size = ROUND_4M((unsigned long)
	242	&host_task_size);
	243
	244	if (!skas_needs_stub)
	245	*task_size_out = host_task_size;
54ae36f2 JD	246	else
54ae36f2 JD	247	*task_size_out = STUB_START & PGDIR_MASK;
77bf4400 JD	248
	249	return host_task_size;
	250	}
	251
7a3a06d0	252	int __init linux_main(int argc, char **argv)
1da177e4 LT	253	{
	254	unsigned long avail, diff;
	255	unsigned long virtmem_size, max_physmem;
	256	unsigned int i, add;
cb66504d	257	char * mode;
1da177e4	258
ba180fd4 JD	259	for (i = 1; i < argc; i++) {
	260	if ((i == 1) && (argv[i][0] == ' '))
	261	continue;
1da177e4 LT	262	add = 1;
	263	uml_checksetup(argv[i], &add);
	264	if (add)
	265	add_arg(argv[i]);
	266	}
ba180fd4	267	if (have_root == 0)
1da177e4 LT	268	add_arg(DEFAULT_COMMAND_LINE);
1da177e4 LT	269
ba180fd4	270	/* OS sanity checks that need to happen before the kernel runs */
60d339f6	271	os_early_checks();
cb66504d	272
42fda663 JD	273	can_do_skas();
	274
	275	if (proc_mm && ptrace_faultinfo)
cb66504d PBG	276	mode = "SKAS3";
	277	else
	278	mode = "SKAS0";
cb66504d PBG	279
	280	printf("UML running in %s mode\n", mode);
	281
6aa802ce	282	host_task_size = set_task_sizes_skas(&task_size);
1da177e4	283
1da177e4	284	brk_start = (unsigned long) sbrk(0);
77bf4400	285
ba180fd4 JD	286	/*
	287	* Increase physical memory size for exec-shield users
	288	* so they actually get what they asked for. This should
	289	* add zero for non-exec shield users
	290	*/
1da177e4 LT	291
1da177e4 LT	292	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
ba180fd4	293	if (diff > 1024 * 1024) {
1da177e4 LT	294	printf("Adding %ld bytes to physical memory to account for "
	295	"exec-shield gap\n", diff);
	296	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	297	}
	298
1d1497e1	299	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
1da177e4 LT	300
	301	/* Reserve up to 4M after the current brk */
	302	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	303
96b644bd	304	setup_machinename(init_utsname()->machine);
1da177e4	305
1da177e4 LT	306	highmem = 0;
	307	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	308	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
	309
ba180fd4 JD	310	/*
ba180fd4 JD	311	* Zones have to begin on a 1 << MAX_ORDER page boundary,
1da177e4 LT	312	* so this makes sure that's true for highmem
	313	*/
	314	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
ba180fd4	315	if (physmem_size + iomem_size > max_physmem) {
1da177e4 LT	316	highmem = physmem_size + iomem_size - max_physmem;
	317	physmem_size -= highmem;
	318	#ifndef CONFIG_HIGHMEM
	319	highmem = 0;
	320	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
d9f8b62a	321	"to %Lu bytes\n", physmem_size);
1da177e4 LT	322	#endif
	323	}
	324
	325	high_physmem = uml_physmem + physmem_size;
	326	end_iomem = high_physmem + iomem_size;
	327	high_memory = (void *) end_iomem;
	328
	329	start_vm = VMALLOC_START;
	330
	331	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
ba180fd4	332	if (init_maps(physmem_size, iomem_size, highmem)) {
d9f8b62a JD	333	printf("Failed to allocate mem_map for %Lu bytes of physical "
d9f8b62a JD	334	"memory and %Lu bytes of highmem\n", physmem_size,
1da177e4 LT	335	highmem);
	336	exit(1);
	337	}
	338
	339	virtmem_size = physmem_size;
	340	avail = get_kmem_end() - start_vm;
ba180fd4 JD	341	if (physmem_size > avail)
ba180fd4 JD	342	virtmem_size = avail;
1da177e4 LT	343	end_vm = start_vm + virtmem_size;
1da177e4 LT	344
ba180fd4	345	if (virtmem_size < physmem_size)
ae173816	346	printf("Kernel virtual memory size shrunk to %lu bytes\n",
1da177e4 LT	347	virtmem_size);
1da177e4 LT	348
a5ed1ffa	349	uml_postsetup();
1da177e4	350
57598fd7	351	stack_protections((unsigned long) &init_thread_info);
1da177e4 LT	352	os_flush_stdout();
1da177e4 LT	353
77bf4400	354	return start_uml();
1da177e4 LT	355	}
	356
	357	extern int uml_exitcode;
	358
	359	static int panic_exit(struct notifier_block *self, unsigned long unused1,
	360	void *unused2)
	361	{
	362	bust_spinlocks(1);
	363	show_regs(&(current->thread.regs));
	364	bust_spinlocks(0);
	365	uml_exitcode = 1;
63843c26	366	os_dump_core();
a5ed1ffa	367	return 0;
1da177e4 LT	368	}
	369
	370	static struct notifier_block panic_exit_notifier = {
	371	.notifier_call = panic_exit,
	372	.next = NULL,
	373	.priority = 0
	374	};
	375
	376	void __init setup_arch(char **cmdline_p)
	377	{
e041c683 AS	378	atomic_notifier_chain_register(&panic_notifier_list,
e041c683 AS	379	&panic_exit_notifier);
1da177e4	380	paging_init();
19bf7e7a	381	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
a5ed1ffa	382	*cmdline_p = command_line;
b4ffb6ad	383	setup_hostinfo(host_info, sizeof host_info);
1da177e4 LT	384	}
	385
	386	void __init check_bugs(void)
	387	{
	388	arch_check_bugs();
a5ed1ffa	389	os_check_bugs();
1da177e4 LT	390	}
1da177e4 LT	391
9a0b5817 GH	392	void apply_alternatives(struct alt_instr start, struct alt_instr end)
	393	{
	394	}
	395
c61a8416	396	#ifdef CONFIG_SMP
9a0b5817 GH	397	void alternatives_smp_module_add(struct module mod, char name,
	398	void locks, void locks_end,
	399	void text, void text_end)
	400	{
	401	}
	402
	403	void alternatives_smp_module_del(struct module *mod)
1da177e4 LT	404	{
1da177e4 LT	405	}
c61a8416	406	#endif