[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 "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 "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)
{
}

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_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", 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"
);

#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, 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 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(init_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(boot_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
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"
	20	#include "asm/page.h"
	21	#include "asm/pgtable.h"
	22	#include "asm/ptrace.h"
	23	#include "asm/elf.h"
	24	#include "asm/user.h"
16c11163	25	#include "asm/setup.h"
1da177e4 LT	26	#include "ubd_user.h"
1da177e4 LT	27	#include "asm/current.h"
1da177e4 LT	28	#include "user_util.h"
	29	#include "kern_util.h"
	30	#include "kern.h"
	31	#include "mem_user.h"
	32	#include "mem.h"
1da177e4 LT	33	#include "initrd.h"
	34	#include "init.h"
	35	#include "os.h"
	36	#include "choose-mode.h"
	37	#include "mode_kern.h"
	38	#include "mode.h"
cb66504d PBG	39	#ifdef UML_CONFIG_MODE_SKAS
	40	#include "skas.h"
	41	#endif
1da177e4 LT	42
	43	#define DEFAULT_COMMAND_LINE "root=98:0"
	44
	45	/* Changed in linux_main and setup_arch, which run before SMP is started */
16c11163	46	static char command_line[COMMAND_LINE_SIZE] = { 0 };
1da177e4	47
16c11163	48	static void add_arg(char *arg)
1da177e4 LT	49	{
	50	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	51	printf("add_arg: Too many command line arguments!\n");
	52	exit(1);
	53	}
	54	if(strlen(command_line) > 0)
	55	strcat(command_line, " ");
	56	strcat(command_line, arg);
	57	}
	58
	59	struct cpuinfo_um boot_cpu_data = {
	60	.loops_per_jiffy = 0,
	61	.ipi_pipe = { -1, -1 }
	62	};
	63
	64	unsigned long thread_saved_pc(struct task_struct *task)
	65	{
	66	return(os_process_pc(CHOOSE_MODE_PROC(thread_pid_tt, thread_pid_skas,
	67	task)));
	68	}
	69
	70	static int show_cpuinfo(struct seq_file m, void v)
	71	{
	72	int index = 0;
	73
	74	#ifdef CONFIG_SMP
	75	index = (struct cpuinfo_um *) v - cpu_data;
	76	if (!cpu_online(index))
	77	return 0;
	78	#endif
	79
	80	seq_printf(m, "processor\t: %d\n", index);
	81	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	82	seq_printf(m, "model name\t: UML\n");
	83	seq_printf(m, "mode\t\t: %s\n", CHOOSE_MODE("tt", "skas"));
	84	seq_printf(m, "host\t\t: %s\n", host_info);
	85	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	86	loops_per_jiffy/(500000/HZ),
	87	(loops_per_jiffy/(5000/HZ)) % 100);
	88
	89	return(0);
	90	}
	91
	92	static void c_start(struct seq_file m, loff_t *pos)
	93	{
	94	return pos < NR_CPUS ? cpu_data + pos : NULL;
	95	}
	96
	97	static void c_next(struct seq_file m, void v, loff_t pos)
	98	{
	99	++*pos;
	100	return c_start(m, pos);
	101	}
	102
	103	static void c_stop(struct seq_file m, void v)
	104	{
	105	}
	106
5e7672ec	107	const struct seq_operations cpuinfo_op = {
1da177e4 LT	108	.start = c_start,
	109	.next = c_next,
	110	.stop = c_stop,
	111	.show = show_cpuinfo,
	112	};
	113
1da177e4 LT	114	/* Set in linux_main */
	115	unsigned long host_task_size;
	116	unsigned long task_size;
	117
	118	unsigned long uml_start;
	119
	120	/* Set in early boot */
	121	unsigned long uml_physmem;
	122	unsigned long uml_reserved;
	123	unsigned long start_vm;
	124	unsigned long end_vm;
	125	int ncpus = 1;
	126
02215759	127	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	128	/* Pointer set in linux_main, the array itself is private to each thread,
	129	* and changed at address space creation time so this poses no concurrency
	130	* problems.
	131	*/
	132	static char *argv1_begin = NULL;
	133	static char *argv1_end = NULL;
	134	#endif
	135
	136	/* Set in early boot */
	137	static int have_root __initdata = 0;
ae173816	138	long long physmem_size = 32 * 1024 * 1024;
1da177e4 LT	139
	140	void set_cmdline(char *cmd)
	141	{
02215759	142	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	143	char umid, ptr;
	144
	145	if(CHOOSE_MODE(honeypot, 0)) return;
	146
7eebe8a9 JD	147	umid = get_umid();
7eebe8a9 JD	148	if(*umid != '\0'){
1da177e4 LT	149	snprintf(argv1_begin,
	150	(argv1_end - argv1_begin) * sizeof(*ptr),
	151	"(%s) ", umid);
	152	ptr = &argv1_begin[strlen(argv1_begin)];
	153	}
	154	else ptr = argv1_begin;
	155
	156	snprintf(ptr, (argv1_end - ptr) * sizeof(*ptr), "[%s]", cmd);
	157	memset(argv1_begin + strlen(argv1_begin), '\0',
	158	argv1_end - argv1_begin - strlen(argv1_begin));
	159	#endif
	160	}
	161
	162	static char *usage_string =
	163	"User Mode Linux v%s\n"
	164	" available at http://user-mode-linux.sourceforge.net/\n\n";
	165
	166	static int __init uml_version_setup(char line, int add)
	167	{
96b644bd	168	printf("%s\n", init_utsname()->release);
1da177e4 LT	169	exit(0);
	170
	171	return 0;
	172	}
	173
	174	__uml_setup("--version", uml_version_setup,
	175	"--version\n"
	176	" Prints the version number of the kernel.\n\n"
	177	);
	178
	179	static int __init uml_root_setup(char line, int add)
	180	{
	181	have_root = 1;
	182	return 0;
	183	}
	184
	185	__uml_setup("root=", uml_root_setup,
	186	"root=<file containing the root fs>\n"
	187	" This is actually used by the generic kernel in exactly the same\n"
	188	" way as in any other kernel. If you configure a number of block\n"
	189	" devices and want to boot off something other than ubd0, you \n"
	190	" would use something like:\n"
	191	" root=/dev/ubd5\n\n"
	192	);
	193
fbd55779 JD	194	#ifndef CONFIG_MODE_TT
	195
	196	static int __init no_skas_debug_setup(char line, int add)
	197	{
	198	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
	199	printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
	200	printf("doesn't work as expected\n");
	201
	202	return 0;
	203	}
	204
	205	__uml_setup("debug", no_skas_debug_setup,
	206	"debug\n"
	207	" this flag is not needed to run gdb on UML in skas mode\n\n"
	208	);
	209
	210	#endif
	211
1da177e4 LT	212	#ifdef CONFIG_SMP
	213	static int __init uml_ncpus_setup(char line, int add)
	214	{
	215	if (!sscanf(line, "%d", &ncpus)) {
	216	printf("Couldn't parse [%s]\n", line);
	217	return -1;
	218	}
	219
	220	return 0;
	221	}
	222
	223	__uml_setup("ncpus=", uml_ncpus_setup,
	224	"ncpus=<# of desired CPUs>\n"
	225	" This tells an SMP kernel how many virtual processors to start.\n\n"
	226	);
	227	#endif
	228
	229	static int force_tt = 0;
	230
	231	#if defined(CONFIG_MODE_TT) && defined(CONFIG_MODE_SKAS)
	232	#define DEFAULT_TT 0
	233
	234	static int __init mode_tt_setup(char line, int add)
	235	{
	236	force_tt = 1;
	237	return(0);
	238	}
	239
	240	#else
	241	#ifdef CONFIG_MODE_SKAS
	242
	243	#define DEFAULT_TT 0
	244
	245	static int __init mode_tt_setup(char line, int add)
	246	{
	247	printf("CONFIG_MODE_TT disabled - 'mode=tt' ignored\n");
	248	return(0);
	249	}
	250
	251	#else
	252	#ifdef CONFIG_MODE_TT
	253
	254	#define DEFAULT_TT 1
	255
	256	static int __init mode_tt_setup(char line, int add)
	257	{
	258	printf("CONFIG_MODE_SKAS disabled - 'mode=tt' redundant\n");
	259	return(0);
	260	}
	261
1da177e4 LT	262	#endif
	263	#endif
	264	#endif
	265
	266	__uml_setup("mode=tt", mode_tt_setup,
	267	"mode=tt\n"
	268	" When both CONFIG_MODE_TT and CONFIG_MODE_SKAS are enabled, this option\n"
	269	" forces UML to run in tt (tracing thread) mode. It is not the default\n"
	270	" because it's slower and less secure than skas mode.\n\n"
	271	);
	272
	273	int mode_tt = DEFAULT_TT;
	274
	275	static int __init Usage(char line, int add)
	276	{
	277	const char **p;
	278
96b644bd	279	printf(usage_string, init_utsname()->release);
1da177e4 LT	280	p = &__uml_help_start;
	281	while (p < &__uml_help_end) {
	282	printf("%s", *p);
	283	p++;
	284	}
	285	exit(0);
	286
	287	return 0;
	288	}
	289
	290	__uml_setup("--help", Usage,
	291	"--help\n"
	292	" Prints this message.\n\n"
	293	);
	294
	295	static int __init uml_checksetup(char line, int add)
	296	{
	297	struct uml_param *p;
	298
	299	p = &__uml_setup_start;
	300	while(p < &__uml_setup_end) {
	301	int n;
	302
	303	n = strlen(p->str);
	304	if(!strncmp(line, p->str, n)){
	305	if (p->setup_func(line + n, add)) return 1;
	306	}
	307	p++;
	308	}
	309	return 0;
	310	}
	311
	312	static void __init uml_postsetup(void)
	313	{
	314	initcall_t *p;
	315
	316	p = &__uml_postsetup_start;
	317	while(p < &__uml_postsetup_end){
	318	(*p)();
	319	p++;
	320	}
	321	return;
	322	}
	323
	324	/* Set during early boot */
	325	unsigned long brk_start;
	326	unsigned long end_iomem;
	327	EXPORT_SYMBOL(end_iomem);
	328
	329	#define MIN_VMALLOC (32 * 1024 * 1024)
	330
23bbd586 JD	331	extern char __binary_start;
23bbd586 JD	332
1da177e4 LT	333	int linux_main(int argc, char **argv)
	334	{
	335	unsigned long avail, diff;
	336	unsigned long virtmem_size, max_physmem;
	337	unsigned int i, add;
cb66504d	338	char * mode;
1da177e4 LT	339
	340	for (i = 1; i < argc; i++){
	341	if((i == 1) && (argv[i][0] == ' ')) continue;
	342	add = 1;
	343	uml_checksetup(argv[i], &add);
	344	if (add)
	345	add_arg(argv[i]);
	346	}
	347	if(have_root == 0)
	348	add_arg(DEFAULT_COMMAND_LINE);
	349
60d339f6	350	os_early_checks();
8923648c PBG	351	if (force_tt)
8923648c PBG	352	clear_can_do_skas();
1da177e4 LT	353	mode_tt = force_tt ? 1 : !can_do_skas();
	354	#ifndef CONFIG_MODE_TT
	355	if (mode_tt) {
	356	/*Since CONFIG_MODE_TT is #undef'ed, force_tt cannot be 1. So,
	357	* can_do_skas() returned 0, and the message is correct. */
	358	printf("Support for TT mode is disabled, and no SKAS support is present on the host.\n");
	359	exit(1);
	360	}
	361	#endif
cb66504d PBG	362
	363	#ifndef CONFIG_MODE_SKAS
	364	mode = "TT";
	365	#else
	366	/* Show to the user the result of selection */
	367	if (mode_tt)
	368	mode = "TT";
	369	else if (proc_mm && ptrace_faultinfo)
	370	mode = "SKAS3";
	371	else
	372	mode = "SKAS0";
	373	#endif
	374
	375	printf("UML running in %s mode\n", mode);
	376
23bbd586 JD	377	uml_start = (unsigned long) &__binary_start;
	378	host_task_size = CHOOSE_MODE_PROC(set_task_sizes_tt,
	379	set_task_sizes_skas, &task_size);
1da177e4	380
ea2ba7dc GS	381	/*
	382	* Setting up handlers to 'sig_info' struct
	383	*/
	384	os_fill_handlinfo(handlinfo_kern);
	385
1da177e4 LT	386	brk_start = (unsigned long) sbrk(0);
	387	CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
	388	/* Increase physical memory size for exec-shield users
	389	so they actually get what they asked for. This should
	390	add zero for non-exec shield users */
	391
	392	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	393	if(diff > 1024 * 1024){
	394	printf("Adding %ld bytes to physical memory to account for "
	395	"exec-shield gap\n", diff);
	396	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	397	}
	398
23bbd586	399	uml_physmem = uml_start & PAGE_MASK;
1da177e4 LT	400
	401	/* Reserve up to 4M after the current brk */
	402	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	403
96b644bd	404	setup_machinename(init_utsname()->machine);
1da177e4	405
02215759	406	#ifdef CONFIG_CMDLINE_ON_HOST
1da177e4 LT	407	argv1_begin = argv[1];
	408	argv1_end = &argv[1][strlen(argv[1])];
	409	#endif
	410
	411	highmem = 0;
	412	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	413	max_physmem = get_kmem_end() - uml_physmem - iomem_size - MIN_VMALLOC;
	414
	415	/* Zones have to begin on a 1 << MAX_ORDER page boundary,
	416	* so this makes sure that's true for highmem
	417	*/
	418	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
	419	if(physmem_size + iomem_size > max_physmem){
	420	highmem = physmem_size + iomem_size - max_physmem;
	421	physmem_size -= highmem;
	422	#ifndef CONFIG_HIGHMEM
	423	highmem = 0;
	424	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
d9f8b62a	425	"to %Lu bytes\n", physmem_size);
1da177e4 LT	426	#endif
	427	}
	428
	429	high_physmem = uml_physmem + physmem_size;
	430	end_iomem = high_physmem + iomem_size;
	431	high_memory = (void *) end_iomem;
	432
	433	start_vm = VMALLOC_START;
	434
	435	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
	436	if(init_maps(physmem_size, iomem_size, highmem)){
d9f8b62a JD	437	printf("Failed to allocate mem_map for %Lu bytes of physical "
d9f8b62a JD	438	"memory and %Lu bytes of highmem\n", physmem_size,
1da177e4 LT	439	highmem);
	440	exit(1);
	441	}
	442
	443	virtmem_size = physmem_size;
	444	avail = get_kmem_end() - start_vm;
	445	if(physmem_size > avail) virtmem_size = avail;
	446	end_vm = start_vm + virtmem_size;
	447
	448	if(virtmem_size < physmem_size)
ae173816	449	printf("Kernel virtual memory size shrunk to %lu bytes\n",
1da177e4 LT	450	virtmem_size);
	451
	452	uml_postsetup();
	453
	454	task_protections((unsigned long) &init_thread_info);
	455	os_flush_stdout();
	456
	457	return(CHOOSE_MODE(start_uml_tt(), start_uml_skas()));
	458	}
	459
	460	extern int uml_exitcode;
	461
	462	static int panic_exit(struct notifier_block *self, unsigned long unused1,
	463	void *unused2)
	464	{
	465	bust_spinlocks(1);
	466	show_regs(&(current->thread.regs));
	467	bust_spinlocks(0);
	468	uml_exitcode = 1;
	469	machine_halt();
	470	return(0);
	471	}
	472
	473	static struct notifier_block panic_exit_notifier = {
	474	.notifier_call = panic_exit,
	475	.next = NULL,
	476	.priority = 0
	477	};
	478
	479	void __init setup_arch(char **cmdline_p)
	480	{
e041c683 AS	481	atomic_notifier_chain_register(&panic_notifier_list,
e041c683 AS	482	&panic_exit_notifier);
1da177e4	483	paging_init();
19bf7e7a	484	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
1da177e4 LT	485	*cmdline_p = command_line;
	486	setup_hostinfo();
	487	}
	488
	489	void __init check_bugs(void)
	490	{
	491	arch_check_bugs();
8e367065	492	os_check_bugs();
1da177e4 LT	493	}
1da177e4 LT	494
9a0b5817 GH	495	void apply_alternatives(struct alt_instr start, struct alt_instr end)
	496	{
	497	}
	498
c61a8416	499	#ifdef CONFIG_SMP
9a0b5817 GH	500	void alternatives_smp_module_add(struct module mod, char name,
	501	void locks, void locks_end,
	502	void text, void text_end)
	503	{
	504	}
	505
	506	void alternatives_smp_module_del(struct module *mod)
1da177e4 LT	507	{
1da177e4 LT	508	}
c61a8416	509	#endif