[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 <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 }
};

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;
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'");

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