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

/*
 * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include "linux/kernel.h"
#include "linux/sched.h"
#include "linux/notifier.h"
#include "linux/mm.h"
#include "linux/types.h"
#include "linux/tty.h"
#include "linux/init.h"
#include "linux/bootmem.h"
#include "linux/spinlock.h"
#include "linux/utsname.h"
#include "linux/sysrq.h"
#include "linux/seq_file.h"
#include "linux/delay.h"
#include "linux/module.h"
#include "linux/utsname.h"
#include "asm/page.h"
#include "asm/pgtable.h"
#include "asm/ptrace.h"
#include "asm/elf.h"
#include "asm/user.h"
#include "asm/setup.h"
#include "ubd_user.h"
#include "asm/current.h"
#include "kern_util.h"
#include "as-layout.h"
#include "arch.h"
#include "kern.h"
#include "mem_user.h"
#include "mem.h"
#include "initrd.h"
#include "init.h"
#include "os.h"
#include "mode_kern.h"
#include "mode.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)
{
	return os_process_pc(thread_pid_skas(task));
}

/* 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)){
			if (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;

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_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);
	before_mem_skas(brk_start);
	/* 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_skas();
}

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	/*
1da177e4 LT	2	* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
	3	* Licensed under the GPL
	4	*/
	5
1da177e4 LT	6	#include "linux/kernel.h"
	7	#include "linux/sched.h"
	8	#include "linux/notifier.h"
	9	#include "linux/mm.h"
	10	#include "linux/types.h"
	11	#include "linux/tty.h"
	12	#include "linux/init.h"
	13	#include "linux/bootmem.h"
	14	#include "linux/spinlock.h"
	15	#include "linux/utsname.h"
	16	#include "linux/sysrq.h"
	17	#include "linux/seq_file.h"
	18	#include "linux/delay.h"
	19	#include "linux/module.h"
b4ffb6ad	20	#include "linux/utsname.h"
1da177e4 LT	21	#include "asm/page.h"
	22	#include "asm/pgtable.h"
	23	#include "asm/ptrace.h"
	24	#include "asm/elf.h"
	25	#include "asm/user.h"
16c11163	26	#include "asm/setup.h"
1da177e4 LT	27	#include "ubd_user.h"
1da177e4 LT	28	#include "asm/current.h"
1da177e4	29	#include "kern_util.h"
4ff83ce1	30	#include "as-layout.h"
eb830759	31	#include "arch.h"
1da177e4 LT	32	#include "kern.h"
	33	#include "mem_user.h"
	34	#include "mem.h"
1da177e4 LT	35	#include "initrd.h"
	36	#include "init.h"
	37	#include "os.h"
1da177e4 LT	38	#include "mode_kern.h"
1da177e4 LT	39	#include "mode.h"
cb66504d	40	#include "skas.h"
1da177e4 LT	41
	42	#define DEFAULT_COMMAND_LINE "root=98:0"
	43
1d1497e1	44	/* Changed in add_arg and setup_arch, which run before SMP is started */
7a3a06d0	45	static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
1da177e4	46
7a3a06d0	47	static void __init add_arg(char *arg)
1da177e4 LT	48	{
	49	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	50	printf("add_arg: Too many command line arguments!\n");
	51	exit(1);
	52	}
	53	if(strlen(command_line) > 0)
	54	strcat(command_line, " ");
	55	strcat(command_line, arg);
	56	}
	57
1d1497e1 JD	58	/*
	59	* These fields are initialized at boot time and not changed.
	60	* XXX This structure is used only in the non-SMP case. Maybe this
	61	* should be moved to smp.c.
	62	*/
	63	struct cpuinfo_um boot_cpu_data = {
1da177e4 LT	64	.loops_per_jiffy = 0,
	65	.ipi_pipe = { -1, -1 }
	66	};
	67
	68	unsigned long thread_saved_pc(struct task_struct *task)
	69	{
6aa802ce	70	return os_process_pc(thread_pid_skas(task));
1da177e4 LT	71	}
1da177e4 LT	72
b4ffb6ad JD	73	/* Changed in setup_arch, which is called in early boot */
	74	static char host_info[(__NEW_UTS_LEN + 1) * 5];
	75
1da177e4 LT	76	static int show_cpuinfo(struct seq_file m, void v)
	77	{
	78	int index = 0;
	79
	80	#ifdef CONFIG_SMP
	81	index = (struct cpuinfo_um *) v - cpu_data;
	82	if (!cpu_online(index))
	83	return 0;
	84	#endif
	85
	86	seq_printf(m, "processor\t: %d\n", index);
	87	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	88	seq_printf(m, "model name\t: UML\n");
6aa802ce	89	seq_printf(m, "mode\t\t: skas\n");
1da177e4 LT	90	seq_printf(m, "host\t\t: %s\n", host_info);
	91	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	92	loops_per_jiffy/(500000/HZ),
	93	(loops_per_jiffy/(5000/HZ)) % 100);
	94
a5ed1ffa	95	return 0;
1da177e4 LT	96	}
	97
	98	static void c_start(struct seq_file m, loff_t *pos)
	99	{
	100	return pos < NR_CPUS ? cpu_data + pos : NULL;
	101	}
	102
	103	static void c_next(struct seq_file m, void v, loff_t pos)
	104	{
	105	++*pos;
	106	return c_start(m, pos);
	107	}
	108
	109	static void c_stop(struct seq_file m, void v)
	110	{
	111	}
	112
5e7672ec	113	const struct seq_operations cpuinfo_op = {
1da177e4 LT	114	.start = c_start,
	115	.next = c_next,
	116	.stop = c_stop,
	117	.show = show_cpuinfo,
	118	};
	119
1da177e4 LT	120	/* Set in linux_main */
	121	unsigned long host_task_size;
	122	unsigned long task_size;
1da177e4	123	unsigned long uml_physmem;
1d1497e1	124	unsigned long uml_reserved; /* Also modified in mem_init */
1da177e4 LT	125	unsigned long start_vm;
1da177e4 LT	126	unsigned long end_vm;
1d1497e1 JD	127
1d1497e1 JD	128	/* Set in uml_ncpus_setup */
1da177e4 LT	129	int ncpus = 1;
1da177e4 LT	130
1da177e4 LT	131	/* Set in early boot */
1da177e4 LT	132	static int have_root __initdata = 0;
1d1497e1 JD	133
1d1497e1 JD	134	/* Set in uml_mem_setup and modified in linux_main */
ae173816	135	long long physmem_size = 32 * 1024 * 1024;
1da177e4	136
1da177e4 LT	137	static char *usage_string =
	138	"User Mode Linux v%s\n"
	139	" available at http://user-mode-linux.sourceforge.net/\n\n";
	140
	141	static int __init uml_version_setup(char line, int add)
	142	{
96b644bd	143	printf("%s\n", init_utsname()->release);
1da177e4 LT	144	exit(0);
	145
	146	return 0;
	147	}
	148
	149	__uml_setup("--version", uml_version_setup,
	150	"--version\n"
	151	" Prints the version number of the kernel.\n\n"
	152	);
	153
	154	static int __init uml_root_setup(char line, int add)
	155	{
	156	have_root = 1;
	157	return 0;
	158	}
	159
	160	__uml_setup("root=", uml_root_setup,
	161	"root=<file containing the root fs>\n"
	162	" This is actually used by the generic kernel in exactly the same\n"
	163	" way as in any other kernel. If you configure a number of block\n"
	164	" devices and want to boot off something other than ubd0, you \n"
	165	" would use something like:\n"
	166	" root=/dev/ubd5\n\n"
	167	);
	168
fbd55779 JD	169	static int __init no_skas_debug_setup(char line, int add)
	170	{
	171	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
42fda663	172	printf("'gdb linux'");
fbd55779 JD	173
	174	return 0;
	175	}
	176
	177	__uml_setup("debug", no_skas_debug_setup,
	178	"debug\n"
	179	" this flag is not needed to run gdb on UML in skas mode\n\n"
	180	);
	181
1da177e4 LT	182	#ifdef CONFIG_SMP
	183	static int __init uml_ncpus_setup(char line, int add)
	184	{
a5ed1ffa JD	185	if (!sscanf(line, "%d", &ncpus)) {
	186	printf("Couldn't parse [%s]\n", line);
	187	return -1;
	188	}
1da177e4	189
a5ed1ffa	190	return 0;
1da177e4 LT	191	}
	192
	193	__uml_setup("ncpus=", uml_ncpus_setup,
	194	"ncpus=<# of desired CPUs>\n"
	195	" This tells an SMP kernel how many virtual processors to start.\n\n"
	196	);
	197	#endif
	198
1da177e4 LT	199	static int __init Usage(char line, int add)
1da177e4 LT	200	{
a5ed1ffa	201	const char **p;
1da177e4	202
96b644bd	203	printf(usage_string, init_utsname()->release);
a5ed1ffa JD	204	p = &__uml_help_start;
	205	while (p < &__uml_help_end) {
	206	printf("%s", *p);
	207	p++;
	208	}
1da177e4	209	exit(0);
1da177e4 LT	210	return 0;
	211	}
	212
	213	__uml_setup("--help", Usage,
	214	"--help\n"
	215	" Prints this message.\n\n"
	216	);
	217
	218	static int __init uml_checksetup(char line, int add)
	219	{
	220	struct uml_param *p;
	221
	222	p = &__uml_setup_start;
	223	while(p < &__uml_setup_end) {
	224	int n;
	225
	226	n = strlen(p->str);
	227	if(!strncmp(line, p->str, n)){
	228	if (p->setup_func(line + n, add)) return 1;
	229	}
	230	p++;
	231	}
	232	return 0;
	233	}
	234
	235	static void __init uml_postsetup(void)
	236	{
	237	initcall_t *p;
	238
	239	p = &__uml_postsetup_start;
	240	while(p < &__uml_postsetup_end){
	241	(*p)();
	242	p++;
	243	}
	244	return;
	245	}
	246
	247	/* Set during early boot */
	248	unsigned long brk_start;
	249	unsigned long end_iomem;
	250	EXPORT_SYMBOL(end_iomem);
	251
	252	#define MIN_VMALLOC (32 * 1024 * 1024)
	253
23bbd586 JD	254	extern char __binary_start;
23bbd586 JD	255
7a3a06d0	256	int __init linux_main(int argc, char **argv)
1da177e4 LT	257	{
	258	unsigned long avail, diff;
	259	unsigned long virtmem_size, max_physmem;
	260	unsigned int i, add;
cb66504d	261	char * mode;
1da177e4 LT	262
	263	for (i = 1; i < argc; i++){
	264	if((i == 1) && (argv[i][0] == ' ')) continue;
	265	add = 1;
	266	uml_checksetup(argv[i], &add);
	267	if (add)
	268	add_arg(argv[i]);
	269	}
	270	if(have_root == 0)
	271	add_arg(DEFAULT_COMMAND_LINE);
	272
60d339f6	273	os_early_checks();
cb66504d	274
42fda663 JD	275	can_do_skas();
	276
	277	if (proc_mm && ptrace_faultinfo)
cb66504d PBG	278	mode = "SKAS3";
	279	else
	280	mode = "SKAS0";
cb66504d PBG	281
	282	printf("UML running in %s mode\n", mode);
	283
6aa802ce	284	host_task_size = set_task_sizes_skas(&task_size);
1da177e4	285
ea2ba7dc	286	/*
a5ed1ffa JD	287	* Setting up handlers to 'sig_info' struct
a5ed1ffa JD	288	*/
ea2ba7dc GS	289	os_fill_handlinfo(handlinfo_kern);
ea2ba7dc GS	290
1da177e4	291	brk_start = (unsigned long) sbrk(0);
6aa802ce	292	before_mem_skas(brk_start);
1da177e4 LT	293	/* Increase physical memory size for exec-shield users
	294	so they actually get what they asked for. This should
	295	add zero for non-exec shield users */
	296
	297	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	298	if(diff > 1024 * 1024){
	299	printf("Adding %ld bytes to physical memory to account for "
	300	"exec-shield gap\n", diff);
	301	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	302	}
	303
1d1497e1	304	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
1da177e4 LT	305
	306	/* Reserve up to 4M after the current brk */
	307	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	308
96b644bd	309	setup_machinename(init_utsname()->machine);
1da177e4	310
1da177e4 LT	311	highmem = 0;
	312	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	313	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
	314
	315	/* Zones have to begin on a 1 << MAX_ORDER page boundary,
	316	* so this makes sure that's true for highmem
	317	*/
	318	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
	319	if(physmem_size + iomem_size > max_physmem){
	320	highmem = physmem_size + iomem_size - max_physmem;
	321	physmem_size -= highmem;
	322	#ifndef CONFIG_HIGHMEM
	323	highmem = 0;
	324	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
d9f8b62a	325	"to %Lu bytes\n", physmem_size);
1da177e4 LT	326	#endif
	327	}
	328
	329	high_physmem = uml_physmem + physmem_size;
	330	end_iomem = high_physmem + iomem_size;
	331	high_memory = (void *) end_iomem;
	332
	333	start_vm = VMALLOC_START;
	334
	335	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
	336	if(init_maps(physmem_size, iomem_size, highmem)){
d9f8b62a JD	337	printf("Failed to allocate mem_map for %Lu bytes of physical "
d9f8b62a JD	338	"memory and %Lu bytes of highmem\n", physmem_size,
1da177e4 LT	339	highmem);
	340	exit(1);
	341	}
	342
	343	virtmem_size = physmem_size;
	344	avail = get_kmem_end() - start_vm;
	345	if(physmem_size > avail) virtmem_size = avail;
	346	end_vm = start_vm + virtmem_size;
	347
	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
6aa802ce	357	return start_uml_skas();
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