2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright 2003 PathScale, Inc.
4 * Licensed under the GPL
7 #include "linux/config.h"
8 #include "linux/kernel.h"
9 #include "linux/sched.h"
10 #include "linux/interrupt.h"
12 #include "linux/slab.h"
13 #include "linux/utsname.h"
15 #include "linux/utime.h"
16 #include "linux/smp_lock.h"
17 #include "linux/module.h"
18 #include "linux/init.h"
19 #include "linux/capability.h"
20 #include "linux/vmalloc.h"
21 #include "linux/spinlock.h"
22 #include "linux/proc_fs.h"
23 #include "linux/ptrace.h"
24 #include "linux/random.h"
25 #include "asm/unistd.h"
27 #include "asm/segment.h"
29 #include "asm/pgtable.h"
30 #include "asm/processor.h"
31 #include "asm/tlbflush.h"
32 #include "asm/uaccess.h"
34 #include "user_util.h"
35 #include "kern_util.h"
37 #include "signal_kern.h"
38 #include "signal_user.h"
42 #include "time_user.h"
44 #include "frame_kern.h"
45 #include "sigcontext.h"
46 #include "2_5compat.h"
49 #include "mode_kern.h"
50 #include "choose-mode.h"
52 /* This is a per-cpu array. A processor only modifies its entry and it only
53 * cares about its entry, so it's OK if another processor is modifying its
56 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
58 struct task_struct *get_task(int pid, int require)
60 struct task_struct *ret;
62 read_lock(&tasklist_lock);
63 ret = find_task_by_pid(pid);
64 read_unlock(&tasklist_lock);
66 if(require && (ret == NULL)) panic("get_task couldn't find a task\n");
70 int external_pid(void *t)
72 struct task_struct *task = t ? t : current;
74 return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
77 int pid_to_processor_id(int pid)
81 for(i = 0; i < ncpus; i++){
82 if(cpu_tasks[i].pid == pid) return(i);
87 void free_stack(unsigned long stack, int order)
89 free_pages(stack, order);
92 unsigned long alloc_stack(int order, int atomic)
95 int flags = GFP_KERNEL;
97 if(atomic) flags |= GFP_ATOMIC;
98 page = __get_free_pages(flags, order);
101 stack_protections(page);
105 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
109 current->thread.request.u.thread.proc = fn;
110 current->thread.request.u.thread.arg = arg;
111 pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, NULL, 0, NULL,
114 panic("do_fork failed in kernel_thread, errno = %d", pid);
118 void set_current(void *t)
120 struct task_struct *task = t;
122 cpu_tasks[task->thread_info->cpu] = ((struct cpu_task)
123 { external_pid(task), task });
126 void *_switch_to(void *prev, void *next, void *last)
128 return(CHOOSE_MODE(switch_to_tt(prev, next),
129 switch_to_skas(prev, next)));
132 void interrupt_end(void)
134 if(need_resched()) schedule();
135 if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
138 void release_thread(struct task_struct *task)
140 CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
143 void exit_thread(void)
145 CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
146 unprotect_stack((unsigned long) current_thread);
149 void *get_current(void)
154 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
155 unsigned long stack_top, struct task_struct * p,
156 struct pt_regs *regs)
158 p->thread = (struct thread_struct) INIT_THREAD;
159 return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
160 clone_flags, sp, stack_top, p, regs));
163 void initial_thread_cb(void (*proc)(void *), void *arg)
165 int save_kmalloc_ok = kmalloc_ok;
168 CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
170 kmalloc_ok = save_kmalloc_ok;
173 unsigned long stack_sp(unsigned long page)
175 return(page + PAGE_SIZE - sizeof(void *));
178 int current_pid(void)
180 return(current->pid);
183 void default_idle(void)
187 atomic_inc(&init_mm.mm_count);
188 current->mm = &init_mm;
189 current->active_mm = &init_mm;
192 /* endless idle loop with no priority at all */
196 * although we are an idle CPU, we do not want to
197 * get into the scheduler unnecessarily.
208 CHOOSE_MODE(init_idle_tt(), init_idle_skas());
216 unsigned long page_mask(void)
221 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
230 return(ERR_PTR(-EINVAL));
231 pgd = pgd_offset(task->mm, addr);
232 if(!pgd_present(*pgd))
233 return(ERR_PTR(-EINVAL));
235 pud = pud_offset(pgd, addr);
236 if(!pud_present(*pud))
237 return(ERR_PTR(-EINVAL));
239 pmd = pmd_offset(pud, addr);
240 if(!pmd_present(*pmd))
241 return(ERR_PTR(-EINVAL));
243 pte = pte_offset_kernel(pmd, addr);
244 if(!pte_present(*pte))
245 return(ERR_PTR(-EINVAL));
249 return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
252 char *current_cmd(void)
254 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
257 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
258 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
262 void force_sigbus(void)
264 printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
267 sigaddset(¤t->pending.signal, SIGBUS);
269 current->flags |= PF_SIGNALED;
270 do_exit(SIGBUS | 0x80);
273 void dump_thread(struct pt_regs *regs, struct user *u)
277 void enable_hlt(void)
282 EXPORT_SYMBOL(enable_hlt);
284 void disable_hlt(void)
286 panic("disable_hlt");
289 EXPORT_SYMBOL(disable_hlt);
291 void *um_kmalloc(int size)
293 return(kmalloc(size, GFP_KERNEL));
296 void *um_kmalloc_atomic(int size)
298 return(kmalloc(size, GFP_ATOMIC));
301 void *um_vmalloc(int size)
303 return(vmalloc(size));
306 unsigned long get_fault_addr(void)
308 return((unsigned long) current->thread.fault_addr);
311 EXPORT_SYMBOL(get_fault_addr);
313 void not_implemented(void)
315 printk(KERN_DEBUG "Something isn't implemented in here\n");
318 EXPORT_SYMBOL(not_implemented);
320 int user_context(unsigned long sp)
324 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
325 return(stack != (unsigned long) current_thread);
328 extern void remove_umid_dir(void);
330 __uml_exitcall(remove_umid_dir);
332 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
334 void do_uml_exitcalls(void)
338 call = &__uml_exitcall_end;
339 while (--call >= &__uml_exitcall_begin)
343 char *uml_strdup(char *string)
347 new = kmalloc(strlen(string) + 1, GFP_KERNEL);
348 if(new == NULL) return(NULL);
353 void *get_init_task(void)
355 return(&init_thread_union.thread_info.task);
358 int copy_to_user_proc(void __user *to, void *from, int size)
360 return(copy_to_user(to, from, size));
363 int copy_from_user_proc(void *to, void __user *from, int size)
365 return(copy_from_user(to, from, size));
368 int clear_user_proc(void __user *buf, int size)
370 return(clear_user(buf, size));
373 int strlen_user_proc(char __user *str)
375 return(strlen_user(str));
378 int smp_sigio_handler(void)
381 int cpu = current_thread->cpu;
389 int um_in_interrupt(void)
391 return(in_interrupt());
396 return(current_thread->cpu);
399 static atomic_t using_sysemu = ATOMIC_INIT(0);
400 int sysemu_supported;
402 void set_using_sysemu(int value)
404 if (value > sysemu_supported)
406 atomic_set(&using_sysemu, value);
409 int get_using_sysemu(void)
411 return atomic_read(&using_sysemu);
414 static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
416 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
422 static int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
426 if (copy_from_user(tmp, buf, 1))
429 if (tmp[0] >= '0' && tmp[0] <= '2')
430 set_using_sysemu(tmp[0] - '0');
431 return count; /*We use the first char, but pretend to write everything*/
434 int __init make_proc_sysemu(void)
436 struct proc_dir_entry *ent;
437 if (!sysemu_supported)
440 ent = create_proc_entry("sysemu", 0600, &proc_root);
444 printk("Failed to register /proc/sysemu\n");
448 ent->read_proc = proc_read_sysemu;
449 ent->write_proc = proc_write_sysemu;
454 late_initcall(make_proc_sysemu);
456 int singlestepping(void * t)
458 struct task_struct *task = t ? t : current;
460 if ( ! (task->ptrace & PT_DTRACE) )
463 if (task->thread.singlestep_syscall)
470 * Only x86 and x86_64 have an arch_align_stack().
471 * All other arches have "#define arch_align_stack(x) (x)"
472 * in their asm/system.h
473 * As this is included in UML from asm-um/system-generic.h,
474 * we can use it to behave as the subarch does.
476 #ifndef arch_align_stack
477 unsigned long arch_align_stack(unsigned long sp)
479 if (randomize_va_space)
480 sp -= get_random_int() % 8192;
487 * Overrides for Emacs so that we follow Linus's tabbing style.
488 * Emacs will notice this stuff at the end of the file and automatically
489 * adjust the settings for this buffer only. This must remain at the end
491 * ---------------------------------------------------------------------------
493 * c-file-style: "linux"