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

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

#include "linux/config.h"
#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 "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 "user_util.h"
#include "kern_util.h"
#include "kern.h"
#include "mem_user.h"
#include "mem.h"
#include "umid.h"
#include "initrd.h"
#include "init.h"
#include "os.h"
#include "choose-mode.h"
#include "mode_kern.h"
#include "mode.h"
#ifdef UML_CONFIG_MODE_SKAS
#include "skas.h"
#endif

#define DEFAULT_COMMAND_LINE "root=98:0"

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

static void 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);
}

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(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
					      task)));
}

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: %s\n", CHOOSE_MODE("tt", "skas"));
	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)
{
}

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_start;

/* Set in early boot */
unsigned long uml_physmem;
unsigned long uml_reserved;
unsigned long start_vm;
unsigned long end_vm;
int ncpus = 1;

#ifdef CONFIG_CMDLINE_ON_HOST
/* Pointer set in linux_main, the array itself is private to each thread,
 * and changed at address space creation time so this poses no concurrency
 * problems.
 */
static char *argv1_begin = NULL;
static char *argv1_end = NULL;
#endif

/* Set in early boot */
static int have_root __initdata = 0;
long long physmem_size = 32 * 1024 * 1024;

void set_cmdline(char *cmd)
{
#ifdef CONFIG_CMDLINE_ON_HOST
	char *umid, *ptr;

	if(CHOOSE_MODE(honeypot, 0)) return;

	umid = get_umid();
	if(*umid != '\0'){
		snprintf(argv1_begin, 
			 (argv1_end - argv1_begin) * sizeof(*ptr), 
			 "(%s) ", umid);
		ptr = &argv1_begin[strlen(argv1_begin)];
	}
	else ptr = argv1_begin;

	snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
	memset(argv1_begin + strlen(argv1_begin), '\0', 
	       argv1_end - argv1_begin - strlen(argv1_begin));
#endif
}

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", system_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"
);

#ifndef CONFIG_MODE_TT

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' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
	printf("doesn't work as expected\n");

	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"
);

#endif

#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 force_tt = 0;

#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
#define DEFAULT_TT 0

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

#else
#ifdef CONFIG_MODE_SKAS

#define DEFAULT_TT 0

static int __init mode_tt_setup(char *line, int *add)
{
	printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
	return(0);
}

#else
#ifdef CONFIG_MODE_TT

#define DEFAULT_TT 1

static int __init mode_tt_setup(char *line, int *add)
{
	printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
	return(0);
}

#endif
#endif
#endif

__uml_setup("mode=tt", mode_tt_setup,
"mode=tt\n"
"    When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
"    forces UML to run in tt (tracing thread) mode.  It is not the default\n"
"    because it's slower and less secure than skas mode.\n\n"
);

int mode_tt = DEFAULT_TT;

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

	printf(usage_string, system_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 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();
	if (force_tt)
		clear_can_do_skas();
	mode_tt = force_tt ? 1 : !can_do_skas();
#ifndef CONFIG_MODE_TT
	if (mode_tt) {
		/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
		 * can_do_skas() returned 0, and the message is correct. */
		printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
		exit(1);
	}
#endif

#ifndef CONFIG_MODE_SKAS
	mode = "TT";
#else
	/* Show to the user the result of selection */
	if (mode_tt)
		mode = "TT";
	else if (proc_mm && ptrace_faultinfo)
		mode = "SKAS3";
	else
		mode = "SKAS0";
#endif

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

	uml_start = (unsigned long) &__binary_start;
	host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
					  set_task_sizes_skas, &task_size);

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

	brk_start = (unsigned long) sbrk(0);
	CHOOSE_MODE_PROC(before_mem_tt, 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 = uml_start & PAGE_MASK;

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

	setup_machinename(system_utsname.machine);

#ifdef CONFIG_CMDLINE_ON_HOST
	argv1_begin = argv[1];
	argv1_end = &argv[1][strlen(argv[1])];
#endif
  
	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();

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

	return(CHOOSE_MODE(start_uml_tt(), 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;
	machine_halt();
	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(saved_command_line, command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;
	setup_hostinfo();
}

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
	6	#include "linux/config.h"
	7	#include "linux/kernel.h"
	8	#include "linux/sched.h"
	9	#include "linux/notifier.h"
	10	#include "linux/mm.h"
	11	#include "linux/types.h"
	12	#include "linux/tty.h"
	13	#include "linux/init.h"
	14	#include "linux/bootmem.h"
	15	#include "linux/spinlock.h"
	16	#include "linux/utsname.h"
	17	#include "linux/sysrq.h"
	18	#include "linux/seq_file.h"
	19	#include "linux/delay.h"
	20	#include "linux/module.h"
	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 LT	29	#include "user_util.h"
	30	#include "kern_util.h"
	31	#include "kern.h"
	32	#include "mem_user.h"
	33	#include "mem.h"
	34	#include "umid.h"
	35	#include "initrd.h"
	36	#include "init.h"
	37	#include "os.h"
	38	#include "choose-mode.h"
	39	#include "mode_kern.h"
	40	#include "mode.h"
cb66504d PBG	41	#ifdef UML_CONFIG_MODE_SKAS
	42	#include "skas.h"
	43	#endif
1da177e4 LT	44
	45	#define DEFAULT_COMMAND_LINE "root=98:0"
	46
	47	/* Changed in linux_main and setup_arch, which run before SMP is started */
16c11163	48	static char command_line[COMMAND_LINE_SIZE] = { 0 };
1da177e4	49
16c11163	50	static void add_arg(char *arg)
1da177e4 LT	51	{
	52	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	53	printf("add_arg: Too many command line arguments!\n");
	54	exit(1);
	55	}
	56	if(strlen(command_line) > 0)
	57	strcat(command_line, " ");
	58	strcat(command_line, arg);
	59	}
	60
	61	struct cpuinfo_um boot_cpu_data = {
	62	.loops_per_jiffy = 0,
	63	.ipi_pipe = { -1, -1 }
	64	};
	65
	66	unsigned long thread_saved_pc(struct task_struct *task)
	67	{
	68	return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
	69	task)));
	70	}
	71
	72	static int show_cpuinfo(struct seq_file m, void v)
	73	{
	74	int index = 0;
	75
	76	#ifdef CONFIG_SMP
	77	index = (struct cpuinfo_um *) v - cpu_data;
	78	if (!cpu_online(index))
	79	return 0;
	80	#endif
	81
	82	seq_printf(m, "processor\t: %d\n", index);
	83	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	84	seq_printf(m, "model name\t: UML\n");
	85	seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
	86	seq_printf(m, "host\t\t: %s\n", host_info);
	87	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	88	loops_per_jiffy/(500000/HZ),
	89	(loops_per_jiffy/(5000/HZ)) % 100);
	90
	91	return(0);
	92	}
	93
	94	static void c_start(struct seq_file m, loff_t *pos)
	95	{
	96	return pos < NR_CPUS ? cpu_data + pos : NULL;
	97	}
	98
	99	static void c_next(struct seq_file m, void v, loff_t pos)
	100	{
	101	++*pos;
	102	return c_start(m, pos);
	103	}
	104
	105	static void c_stop(struct seq_file m, void v)
	106	{
	107	}
	108
	109	struct seq_operations cpuinfo_op = {
	110	.start = c_start,
	111	.next = c_next,
	112	.stop = c_stop,
	113	.show = show_cpuinfo,
	114	};
115
1da177e4 LT	116	/* Set in linux_main */
	117	unsigned long host_task_size;
	118	unsigned long task_size;
	119
	120	unsigned long uml_start;
	121
	122	/* Set in early boot */
	123	unsigned long uml_physmem;
	124	unsigned long uml_reserved;
	125	unsigned long start_vm;
	126	unsigned long end_vm;
	127	int ncpus = 1;
	128
02215759	129	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	130	/* Pointer set in linux_main, the array itself is private to each thread,
	131	* and changed at address space creation time so this poses no concurrency
	132	* problems.
	133	*/
	134	static char *argv1_begin = NULL;
	135	static char *argv1_end = NULL;
	136	#endif
	137
	138	/* Set in early boot */
	139	static int have_root __initdata = 0;
ae173816	140	long long physmem_size = 32 * 1024 * 1024;
1da177e4 LT	141
	142	void set_cmdline(char *cmd)
	143	{
02215759	144	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	145	char umid, ptr;
	146
	147	if(CHOOSE_MODE(honeypot, 0)) return;
	148
7eebe8a9 JD	149	umid = get_umid();
7eebe8a9 JD	150	if(*umid != '\0'){
1da177e4 LT	151	snprintf(argv1_begin,
	152	(argv1_end - argv1_begin) * sizeof(*ptr),
	153	"(%s) ", umid);
	154	ptr = &argv1_begin[strlen(argv1_begin)];
	155	}
	156	else ptr = argv1_begin;
	157
	158	snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
	159	memset(argv1_begin + strlen(argv1_begin), '\0',
	160	argv1_end - argv1_begin - strlen(argv1_begin));
	161	#endif
	162	}
	163
	164	static char *usage_string =
	165	"User Mode Linux v%s\n"
	166	" available at http://user-mode-linux.sourceforge.net/\n\n";
	167
	168	static int __init uml_version_setup(char line, int add)
	169	{
	170	printf("%s\n", system_utsname.release);
	171	exit(0);
	172
	173	return 0;
	174	}
	175
	176	__uml_setup("--version", uml_version_setup,
	177	"--version\n"
	178	" Prints the version number of the kernel.\n\n"
	179	);
	180
	181	static int __init uml_root_setup(char line, int add)
	182	{
	183	have_root = 1;
	184	return 0;
	185	}
	186
	187	__uml_setup("root=", uml_root_setup,
	188	"root=<file containing the root fs>\n"
	189	" This is actually used by the generic kernel in exactly the same\n"
	190	" way as in any other kernel. If you configure a number of block\n"
	191	" devices and want to boot off something other than ubd0, you \n"
	192	" would use something like:\n"
	193	" root=/dev/ubd5\n\n"
	194	);
	195
fbd55779 JD	196	#ifndef CONFIG_MODE_TT
	197
	198	static int __init no_skas_debug_setup(char line, int add)
	199	{
	200	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
	201	printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
	202	printf("doesn't work as expected\n");
	203
	204	return 0;
	205	}
	206
	207	__uml_setup("debug", no_skas_debug_setup,
	208	"debug\n"
	209	" this flag is not needed to run gdb on UML in skas mode\n\n"
	210	);
	211
	212	#endif
	213
1da177e4 LT	214	#ifdef CONFIG_SMP
	215	static int __init uml_ncpus_setup(char line, int add)
	216	{
	217	if (!sscanf(line, "%d", &ncpus)) {
	218	printf("Couldn't parse [%s]\n", line);
	219	return -1;
	220	}
	221
	222	return 0;
	223	}
	224
	225	__uml_setup("ncpus=", uml_ncpus_setup,
	226	"ncpus=<# of desired CPUs>\n"
	227	" This tells an SMP kernel how many virtual processors to start.\n\n"
	228	);
	229	#endif
	230
	231	static int force_tt = 0;
	232
	233	#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
	234	#define DEFAULT_TT 0
	235
	236	static int __init mode_tt_setup(char line, int add)
	237	{
	238	force_tt = 1;
	239	return(0);
	240	}
	241
	242	#else
	243	#ifdef CONFIG_MODE_SKAS
	244
	245	#define DEFAULT_TT 0
	246
	247	static int __init mode_tt_setup(char line, int add)
	248	{
	249	printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
	250	return(0);
	251	}
	252
	253	#else
	254	#ifdef CONFIG_MODE_TT
	255
	256	#define DEFAULT_TT 1
	257
	258	static int __init mode_tt_setup(char line, int add)
	259	{
	260	printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
	261	return(0);
	262	}
	263
1da177e4 LT	264	#endif
	265	#endif
	266	#endif
	267
	268	__uml_setup("mode=tt", mode_tt_setup,
	269	"mode=tt\n"
	270	" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
	271	" forces UML to run in tt (tracing thread) mode. It is not the default\n"
	272	" because it's slower and less secure than skas mode.\n\n"
	273	);
	274
	275	int mode_tt = DEFAULT_TT;
	276
	277	static int __init Usage(char line, int add)
	278	{
	279	const char **p;
	280
	281	printf(usage_string, system_utsname.release);
	282	p = &__uml_help_start;
	283	while (p < &__uml_help_end) {
	284	printf("%s", *p);
	285	p++;
	286	}
	287	exit(0);
	288
	289	return 0;
	290	}
	291
	292	__uml_setup("--help", Usage,
	293	"--help\n"
	294	" Prints this message.\n\n"
	295	);
	296
	297	static int __init uml_checksetup(char line, int add)
	298	{
	299	struct uml_param *p;
	300
	301	p = &__uml_setup_start;
	302	while(p < &__uml_setup_end) {
	303	int n;
	304
	305	n = strlen(p->str);
	306	if(!strncmp(line, p->str, n)){
	307	if (p->setup_func(line + n, add)) return 1;
	308	}
	309	p++;
	310	}
	311	return 0;
	312	}
	313
	314	static void __init uml_postsetup(void)
	315	{
	316	initcall_t *p;
	317
	318	p = &__uml_postsetup_start;
	319	while(p < &__uml_postsetup_end){
	320	(*p)();
	321	p++;
	322	}
	323	return;
	324	}
	325
	326	/* Set during early boot */
	327	unsigned long brk_start;
328	unsigned long end_iomem;
329	EXPORT_SYMBOL(end_iomem);
330
331	#define MIN_VMALLOC (32 * 1024 * 1024)
332
23bbd586 JD	333	extern char __binary_start;
23bbd586 JD	334
1da177e4 LT	335	int linux_main(int argc, char **argv)
	336	{
	337	unsigned long avail, diff;
	338	unsigned long virtmem_size, max_physmem;
	339	unsigned int i, add;
cb66504d	340	char * mode;
1da177e4 LT	341
	342	for (i = 1; i < argc; i++){
	343	if((i == 1) && (argv[i][0] == ' ')) continue;
	344	add = 1;
	345	uml_checksetup(argv[i], &add);
	346	if (add)
	347	add_arg(argv[i]);
	348	}
	349	if(have_root == 0)
	350	add_arg(DEFAULT_COMMAND_LINE);
	351
60d339f6	352	os_early_checks();
8923648c PBG	353	if (force_tt)
8923648c PBG	354	clear_can_do_skas();
1da177e4 LT	355	mode_tt = force_tt ? 1 : !can_do_skas();
	356	#ifndef CONFIG_MODE_TT
	357	if (mode_tt) {
	358	/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
	359	* can_do_skas() returned 0, and the message is correct. */
	360	printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
	361	exit(1);
	362	}
	363	#endif
cb66504d PBG	364
	365	#ifndef CONFIG_MODE_SKAS
	366	mode = "TT";
	367	#else
	368	/* Show to the user the result of selection */
	369	if (mode_tt)
	370	mode = "TT";
	371	else if (proc_mm && ptrace_faultinfo)
	372	mode = "SKAS3";
	373	else
	374	mode = "SKAS0";
	375	#endif
	376
	377	printf("UML running in %s mode\n", mode);
	378
23bbd586 JD	379	uml_start = (unsigned long) &__binary_start;
	380	host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
	381	set_task_sizes_skas, &task_size);
1da177e4	382
ea2ba7dc GS	383	/*
	384	* Setting up handlers to 'sig_info' struct
	385	*/
	386	os_fill_handlinfo(handlinfo_kern);
	387
1da177e4 LT	388	brk_start = (unsigned long) sbrk(0);
	389	CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
	390	/* Increase physical memory size for exec-shield users
	391	so they actually get what they asked for. This should
	392	add zero for non-exec shield users */
	393
	394	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	395	if(diff > 1024 * 1024){
	396	printf("Adding %ld bytes to physical memory to account for "
	397	"exec-shield gap\n", diff);
	398	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	399	}
	400
23bbd586	401	uml_physmem = uml_start & PAGE_MASK;
1da177e4 LT	402
	403	/* Reserve up to 4M after the current brk */
	404	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	405
	406	setup_machinename(system_utsname.machine);
	407
02215759	408	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	409	argv1_begin = argv[1];
	410	argv1_end = &argv[1][strlen(argv[1])];
	411	#endif
	412
	413	highmem = 0;
	414	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	415	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
	416
	417	/* Zones have to begin on a 1 << MAX_ORDER page boundary,
	418	* so this makes sure that's true for highmem
	419	*/
	420	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
	421	if(physmem_size + iomem_size > max_physmem){
	422	highmem = physmem_size + iomem_size - max_physmem;
	423	physmem_size -= highmem;
	424	#ifndef CONFIG_HIGHMEM
	425	highmem = 0;
	426	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
d9f8b62a	427	"to %Lu bytes\n", physmem_size);
1da177e4 LT	428	#endif
	429	}
	430
	431	high_physmem = uml_physmem + physmem_size;
	432	end_iomem = high_physmem + iomem_size;
	433	high_memory = (void *) end_iomem;
	434
	435	start_vm = VMALLOC_START;
	436
	437	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
	438	if(init_maps(physmem_size, iomem_size, highmem)){
d9f8b62a JD	439	printf("Failed to allocate mem_map for %Lu bytes of physical "
d9f8b62a JD	440	"memory and %Lu bytes of highmem\n", physmem_size,
1da177e4 LT	441	highmem);
	442	exit(1);
	443	}
	444
	445	virtmem_size = physmem_size;
	446	avail = get_kmem_end() - start_vm;
	447	if(physmem_size > avail) virtmem_size = avail;
	448	end_vm = start_vm + virtmem_size;
	449
	450	if(virtmem_size < physmem_size)
ae173816	451	printf("Kernel virtual memory size shrunk to %lu bytes\n",
1da177e4 LT	452	virtmem_size);
	453
	454	uml_postsetup();
	455
	456	task_protections((unsigned long) &init_thread_info);
	457	os_flush_stdout();
	458
	459	return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
	460	}
	461
	462	extern int uml_exitcode;
	463
	464	static int panic_exit(struct notifier_block *self, unsigned long unused1,
	465	void *unused2)
	466	{
	467	bust_spinlocks(1);
	468	show_regs(&(current->thread.regs));
	469	bust_spinlocks(0);
	470	uml_exitcode = 1;
	471	machine_halt();
	472	return(0);
	473	}
	474
	475	static struct notifier_block panic_exit_notifier = {
	476	.notifier_call = panic_exit,
	477	.next = NULL,
	478	.priority = 0
	479	};
	480
	481	void __init setup_arch(char **cmdline_p)
	482	{
e041c683 AS	483	atomic_notifier_chain_register(&panic_notifier_list,
e041c683 AS	484	&panic_exit_notifier);
1da177e4	485	paging_init();
16c11163	486	strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
1da177e4 LT	487	*cmdline_p = command_line;
	488	setup_hostinfo();
	489	}
	490
	491	void __init check_bugs(void)
	492	{
	493	arch_check_bugs();
8e367065	494	os_check_bugs();
1da177e4 LT	495	}
1da177e4 LT	496
9a0b5817 GH	497	void apply_alternatives(struct alt_instr start, struct alt_instr end)
	498	{
	499	}
	500
c61a8416	501	#ifdef CONFIG_SMP
9a0b5817 GH	502	void alternatives_smp_module_add(struct module mod, char name,
	503	void locks, void locks_end,
	504	void text, void text_end)
	505	{
	506	}
	507
	508	void alternatives_smp_module_del(struct module *mod)
1da177e4 LT	509	{
1da177e4 LT	510	}
c61a8416	511	#endif