[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/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <linux/sched.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/setup.h>
#include <as-layout.h>
#include <arch.h>
#include <init.h>
#include <kern.h>
#include <kern_util.h>
#include <mem_user.h>
#include <os.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 }
};

union thread_union cpu0_irqstack
	__attribute__((__section__(".data..init_irqstack"))) =
		{ INIT_THREAD_INFO(init_task) };

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 uml_physmem;
EXPORT_SYMBOL(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 const 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'\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"
);

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

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

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

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

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

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
};

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

unsigned long host_task_size;

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 long stack;
	unsigned int i;
	int 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);

	host_task_size = os_get_top_address();
	/*
	 * TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
	 * out
	 */
	task_size = host_task_size & PGDIR_MASK;

	/* 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);

	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 = TASK_SIZE - 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;
	stack = (unsigned long) argv;
	stack &= ~(1024 * 1024 - 1);
	avail = stack - 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);

	atomic_notifier_chain_register(&panic_notifier_list,
				       &panic_exit_notifier);

	uml_postsetup();

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

	return start_uml();
}

void __init setup_arch(char **cmdline_p)
{
	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
	1	/*
	2	* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
	3	* Licensed under the GPL
	4	*/
	5
	6	#include <linux/delay.h>
	7	#include <linux/init.h>
	8	#include <linux/mm.h>
	9	#include <linux/module.h>
	10	#include <linux/seq_file.h>
	11	#include <linux/string.h>
	12	#include <linux/utsname.h>
	13	#include <linux/sched.h>
	14	#include <asm/pgtable.h>
	15	#include <asm/processor.h>
	16	#include <asm/setup.h>
	17	#include <as-layout.h>
	18	#include <arch.h>
	19	#include <init.h>
	20	#include <kern.h>
	21	#include <kern_util.h>
	22	#include <mem_user.h>
	23	#include <os.h>
	24
	25	#define DEFAULT_COMMAND_LINE "root=98:0"
	26
	27	/* Changed in add_arg and setup_arch, which run before SMP is started */
	28	static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };
	29
	30	static void __init add_arg(char *arg)
	31	{
	32	if (strlen(command_line) + strlen(arg) + 1 > COMMAND_LINE_SIZE) {
	33	printf("add_arg: Too many command line arguments!\n");
	34	exit(1);
	35	}
	36	if (strlen(command_line) > 0)
	37	strcat(command_line, " ");
	38	strcat(command_line, arg);
	39	}
	40
	41	/*
	42	* These fields are initialized at boot time and not changed.
	43	* XXX This structure is used only in the non-SMP case. Maybe this
	44	* should be moved to smp.c.
	45	*/
	46	struct cpuinfo_um boot_cpu_data = {
	47	.loops_per_jiffy = 0,
	48	.ipi_pipe = { -1, -1 }
	49	};
	50
	51	union thread_union cpu0_irqstack
	52	__attribute__((__section__(".data..init_irqstack"))) =
	53	{ INIT_THREAD_INFO(init_task) };
	54
	55	unsigned long thread_saved_pc(struct task_struct *task)
	56	{
	57	/* FIXME: Need to look up userspace_pid by cpu */
	58	return os_process_pc(userspace_pid[0]);
	59	}
	60
	61	/* Changed in setup_arch, which is called in early boot */
	62	static char host_info[(__NEW_UTS_LEN + 1) * 5];
	63
	64	static int show_cpuinfo(struct seq_file m, void v)
	65	{
	66	int index = 0;
	67
	68	#ifdef CONFIG_SMP
	69	index = (struct cpuinfo_um *) v - cpu_data;
	70	if (!cpu_online(index))
	71	return 0;
	72	#endif
	73
	74	seq_printf(m, "processor\t: %d\n", index);
	75	seq_printf(m, "vendor_id\t: User Mode Linux\n");
	76	seq_printf(m, "model name\t: UML\n");
	77	seq_printf(m, "mode\t\t: skas\n");
	78	seq_printf(m, "host\t\t: %s\n", host_info);
	79	seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
	80	loops_per_jiffy/(500000/HZ),
	81	(loops_per_jiffy/(5000/HZ)) % 100);
	82
	83	return 0;
	84	}
	85
	86	static void c_start(struct seq_file m, loff_t *pos)
	87	{
	88	return pos < NR_CPUS ? cpu_data + pos : NULL;
	89	}
	90
	91	static void c_next(struct seq_file m, void v, loff_t pos)
	92	{
	93	++*pos;
	94	return c_start(m, pos);
	95	}
	96
	97	static void c_stop(struct seq_file m, void v)
	98	{
	99	}
	100
	101	const struct seq_operations cpuinfo_op = {
	102	.start = c_start,
	103	.next = c_next,
	104	.stop = c_stop,
	105	.show = show_cpuinfo,
	106	};
	107
	108	/* Set in linux_main */
	109	unsigned long uml_physmem;
	110	EXPORT_SYMBOL(uml_physmem);
	111
	112	unsigned long uml_reserved; /* Also modified in mem_init */
	113	unsigned long start_vm;
	114	unsigned long end_vm;
	115
	116	/* Set in uml_ncpus_setup */
	117	int ncpus = 1;
	118
	119	/* Set in early boot */
	120	static int have_root __initdata = 0;
	121
	122	/* Set in uml_mem_setup and modified in linux_main */
	123	long long physmem_size = 32 * 1024 * 1024;
	124
	125	static const char *usage_string =
	126	"User Mode Linux v%s\n"
	127	" available at http://user-mode-linux.sourceforge.net/\n\n";
	128
	129	static int __init uml_version_setup(char line, int add)
	130	{
	131	printf("%s\n", init_utsname()->release);
	132	exit(0);
	133
	134	return 0;
	135	}
	136
	137	__uml_setup("--version", uml_version_setup,
	138	"--version\n"
	139	" Prints the version number of the kernel.\n\n"
	140	);
	141
	142	static int __init uml_root_setup(char line, int add)
	143	{
	144	have_root = 1;
	145	return 0;
	146	}
	147
	148	__uml_setup("root=", uml_root_setup,
	149	"root=<file containing the root fs>\n"
	150	" This is actually used by the generic kernel in exactly the same\n"
	151	" way as in any other kernel. If you configure a number of block\n"
	152	" devices and want to boot off something other than ubd0, you \n"
	153	" would use something like:\n"
	154	" root=/dev/ubd5\n\n"
	155	);
	156
	157	static int __init no_skas_debug_setup(char line, int add)
	158	{
	159	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
	160	printf("'gdb linux'\n");
	161
	162	return 0;
	163	}
	164
	165	__uml_setup("debug", no_skas_debug_setup,
	166	"debug\n"
	167	" this flag is not needed to run gdb on UML in skas mode\n\n"
	168	);
	169
	170	#ifdef CONFIG_SMP
	171	static int __init uml_ncpus_setup(char line, int add)
	172	{
	173	if (!sscanf(line, "%d", &ncpus)) {
	174	printf("Couldn't parse [%s]\n", line);
	175	return -1;
	176	}
	177
	178	return 0;
	179	}
	180
	181	__uml_setup("ncpus=", uml_ncpus_setup,
	182	"ncpus=<# of desired CPUs>\n"
	183	" This tells an SMP kernel how many virtual processors to start.\n\n"
	184	);
	185	#endif
	186
	187	static int __init Usage(char line, int add)
	188	{
	189	const char **p;
	190
	191	printf(usage_string, init_utsname()->release);
	192	p = &__uml_help_start;
	193	while (p < &__uml_help_end) {
	194	printf("%s", *p);
	195	p++;
	196	}
	197	exit(0);
	198	return 0;
	199	}
	200
	201	__uml_setup("--help", Usage,
	202	"--help\n"
	203	" Prints this message.\n\n"
	204	);
	205
	206	static void __init uml_checksetup(char line, int add)
	207	{
	208	struct uml_param *p;
	209
	210	p = &__uml_setup_start;
	211	while (p < &__uml_setup_end) {
	212	size_t n;
	213
	214	n = strlen(p->str);
	215	if (!strncmp(line, p->str, n) && p->setup_func(line + n, add))
	216	return;
	217	p++;
	218	}
	219	}
	220
	221	static void __init uml_postsetup(void)
	222	{
	223	initcall_t *p;
	224
	225	p = &__uml_postsetup_start;
	226	while (p < &__uml_postsetup_end) {
	227	(*p)();
	228	p++;
	229	}
	230	return;
	231	}
	232
	233	static int panic_exit(struct notifier_block *self, unsigned long unused1,
	234	void *unused2)
	235	{
	236	bust_spinlocks(1);
	237	show_regs(&(current->thread.regs));
	238	bust_spinlocks(0);
	239	uml_exitcode = 1;
	240	os_dump_core();
	241	return 0;
	242	}
	243
	244	static struct notifier_block panic_exit_notifier = {
	245	.notifier_call = panic_exit,
	246	.next = NULL,
	247	.priority = 0
	248	};
	249
	250	/* Set during early boot */
	251	unsigned long task_size;
	252	EXPORT_SYMBOL(task_size);
	253
	254	unsigned long host_task_size;
	255
	256	unsigned long brk_start;
	257	unsigned long end_iomem;
	258	EXPORT_SYMBOL(end_iomem);
	259
	260	#define MIN_VMALLOC (32 * 1024 * 1024)
	261
	262	extern char __binary_start;
	263
	264	int __init linux_main(int argc, char **argv)
	265	{
	266	unsigned long avail, diff;
	267	unsigned long virtmem_size, max_physmem;
	268	unsigned long stack;
	269	unsigned int i;
	270	int add;
	271	char * mode;
	272
	273	for (i = 1; i < argc; i++) {
	274	if ((i == 1) && (argv[i][0] == ' '))
	275	continue;
	276	add = 1;
	277	uml_checksetup(argv[i], &add);
	278	if (add)
	279	add_arg(argv[i]);
	280	}
	281	if (have_root == 0)
	282	add_arg(DEFAULT_COMMAND_LINE);
	283
	284	host_task_size = os_get_top_address();
	285	/*
	286	* TASK_SIZE needs to be PGDIR_SIZE aligned or else exit_mmap craps
	287	* out
	288	*/
	289	task_size = host_task_size & PGDIR_MASK;
	290
	291	/* OS sanity checks that need to happen before the kernel runs */
	292	os_early_checks();
	293
	294	can_do_skas();
	295
	296	if (proc_mm && ptrace_faultinfo)
	297	mode = "SKAS3";
	298	else
	299	mode = "SKAS0";
	300
	301	printf("UML running in %s mode\n", mode);
	302
	303	brk_start = (unsigned long) sbrk(0);
	304
	305	/*
	306	* Increase physical memory size for exec-shield users
	307	* so they actually get what they asked for. This should
	308	* add zero for non-exec shield users
	309	*/
	310
	311	diff = UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	312	if (diff > 1024 * 1024) {
	313	printf("Adding %ld bytes to physical memory to account for "
	314	"exec-shield gap\n", diff);
	315	physmem_size += UML_ROUND_UP(brk_start) - UML_ROUND_UP(&_end);
	316	}
	317
	318	uml_physmem = (unsigned long) &__binary_start & PAGE_MASK;
	319
	320	/* Reserve up to 4M after the current brk */
	321	uml_reserved = ROUND_4M(brk_start) + (1 << 22);
	322
	323	setup_machinename(init_utsname()->machine);
	324
	325	highmem = 0;
	326	iomem_size = (iomem_size + PAGE_SIZE - 1) & PAGE_MASK;
	327	max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
	328
	329	/*
	330	* Zones have to begin on a 1 << MAX_ORDER page boundary,
	331	* so this makes sure that's true for highmem
	332	*/
	333	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
	334	if (physmem_size + iomem_size > max_physmem) {
	335	highmem = physmem_size + iomem_size - max_physmem;
	336	physmem_size -= highmem;
	337	#ifndef CONFIG_HIGHMEM
	338	highmem = 0;
	339	printf("CONFIG_HIGHMEM not enabled - physical memory shrunk "
	340	"to %Lu bytes\n", physmem_size);
	341	#endif
	342	}
	343
	344	high_physmem = uml_physmem + physmem_size;
	345	end_iomem = high_physmem + iomem_size;
	346	high_memory = (void *) end_iomem;
	347
	348	start_vm = VMALLOC_START;
	349
	350	setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem);
	351	if (init_maps(physmem_size, iomem_size, highmem)) {
	352	printf("Failed to allocate mem_map for %Lu bytes of physical "
	353	"memory and %Lu bytes of highmem\n", physmem_size,
	354	highmem);
	355	exit(1);
	356	}
	357
	358	virtmem_size = physmem_size;
	359	stack = (unsigned long) argv;
	360	stack &= ~(1024 * 1024 - 1);
	361	avail = stack - start_vm;
	362	if (physmem_size > avail)
	363	virtmem_size = avail;
	364	end_vm = start_vm + virtmem_size;
	365
	366	if (virtmem_size < physmem_size)
	367	printf("Kernel virtual memory size shrunk to %lu bytes\n",
	368	virtmem_size);
	369
	370	atomic_notifier_chain_register(&panic_notifier_list,
	371	&panic_exit_notifier);
	372
	373	uml_postsetup();
	374
	375	stack_protections((unsigned long) &init_thread_info);
	376	os_flush_stdout();
	377
	378	return start_uml();
	379	}
	380
	381	void __init setup_arch(char **cmdline_p)
	382	{
	383	paging_init();
	384	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
	385	*cmdline_p = command_line;
	386	setup_hostinfo(host_info, sizeof host_info);
	387	}
	388
	389	void __init check_bugs(void)
	390	{
	391	arch_check_bugs();
	392	os_check_bugs();
	393	}
	394
	395	void apply_alternatives(struct alt_instr start, struct alt_instr end)
	396	{
	397	}
	398
	399	#ifdef CONFIG_SMP
	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)
	407	{
	408	}
	409	#endif