![Thomas Gleixner](/assets/img/avatar_default.png)
Same code. Use the generic version. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Richard Weinberger <richard@nod.at> Link: http://lkml.kernel.org/r/20120503085035.592937512@linutronix.de
410 lines
9 KiB
C
410 lines
9 KiB
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
|