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 "linux/vs_cvirt.h"
27 #include "asm/unistd.h"
29 #include "asm/segment.h"
31 #include "asm/pgtable.h"
32 #include "asm/processor.h"
33 #include "asm/tlbflush.h"
34 #include "asm/uaccess.h"
36 #include "user_util.h"
37 #include "kern_util.h"
39 #include "signal_kern.h"
40 #include "signal_user.h"
44 #include "time_user.h"
46 #include "frame_kern.h"
47 #include "sigcontext.h"
50 #include "mode_kern.h"
51 #include "choose-mode.h"
53 /* This is a per-cpu array. A processor only modifies its entry and it only
54 * cares about its entry, so it's OK if another processor is modifying its
57 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
59 int external_pid(void *t)
61 struct task_struct *task = t ? t : current;
63 return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
66 int pid_to_processor_id(int pid)
70 for(i = 0; i < ncpus; i++){
71 if(cpu_tasks[i].pid == pid) return(i);
76 void free_stack(unsigned long stack, int order)
78 free_pages(stack, order);
81 unsigned long alloc_stack(int order, int atomic)
84 int flags = GFP_KERNEL;
86 if(atomic) flags |= GFP_ATOMIC;
87 page = __get_free_pages(flags, order);
90 stack_protections(page);
94 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
98 current->thread.request.u.thread.proc = fn;
99 current->thread.request.u.thread.arg = arg;
100 pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, NULL, 0, NULL,
103 panic("do_fork failed in kernel_thread, errno = %d", pid);
107 void set_current(void *t)
109 struct task_struct *task = t;
111 cpu_tasks[task->thread_info->cpu] = ((struct cpu_task)
112 { external_pid(task), task });
115 void *_switch_to(void *prev, void *next, void *last)
117 return(CHOOSE_MODE(switch_to_tt(prev, next),
118 switch_to_skas(prev, next)));
121 void interrupt_end(void)
123 if(need_resched()) schedule();
124 if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
127 void release_thread(struct task_struct *task)
129 CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
132 void exit_thread(void)
134 unprotect_stack((unsigned long) current_thread);
137 void *get_current(void)
142 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
143 unsigned long stack_top, struct task_struct * p,
144 struct pt_regs *regs)
146 p->thread = (struct thread_struct) INIT_THREAD;
147 return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
148 clone_flags, sp, stack_top, p, regs));
151 void initial_thread_cb(void (*proc)(void *), void *arg)
153 int save_kmalloc_ok = kmalloc_ok;
156 CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
158 kmalloc_ok = save_kmalloc_ok;
161 unsigned long stack_sp(unsigned long page)
163 return(page + PAGE_SIZE - sizeof(void *));
166 int current_pid(void)
168 return(current->pid);
171 void default_idle(void)
175 atomic_inc(&init_mm.mm_count);
176 current->mm = &init_mm;
177 current->active_mm = &init_mm;
180 /* endless idle loop with no priority at all */
183 * although we are an idle CPU, we do not want to
184 * get into the scheduler unnecessarily.
195 CHOOSE_MODE(init_idle_tt(), init_idle_skas());
203 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
212 return(ERR_PTR(-EINVAL));
213 pgd = pgd_offset(task->mm, addr);
214 if(!pgd_present(*pgd))
215 return(ERR_PTR(-EINVAL));
217 pud = pud_offset(pgd, addr);
218 if(!pud_present(*pud))
219 return(ERR_PTR(-EINVAL));
221 pmd = pmd_offset(pud, addr);
222 if(!pmd_present(*pmd))
223 return(ERR_PTR(-EINVAL));
225 pte = pte_offset_kernel(pmd, addr);
226 if(!pte_present(*pte))
227 return(ERR_PTR(-EINVAL));
231 return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
234 char *current_cmd(void)
236 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
239 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
240 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
244 void force_sigbus(void)
246 printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
249 sigaddset(¤t->pending.signal, SIGBUS);
251 current->flags |= PF_SIGNALED;
252 do_exit(SIGBUS | 0x80);
255 void dump_thread(struct pt_regs *regs, struct user *u)
259 void enable_hlt(void)
264 EXPORT_SYMBOL(enable_hlt);
266 void disable_hlt(void)
268 panic("disable_hlt");
271 EXPORT_SYMBOL(disable_hlt);
273 void *um_kmalloc(int size)
275 return(kmalloc(size, GFP_KERNEL));
278 void *um_kmalloc_atomic(int size)
280 return(kmalloc(size, GFP_ATOMIC));
283 void *um_vmalloc(int size)
285 return(vmalloc(size));
288 unsigned long get_fault_addr(void)
290 return((unsigned long) current->thread.fault_addr);
293 EXPORT_SYMBOL(get_fault_addr);
295 void not_implemented(void)
297 printk(KERN_DEBUG "Something isn't implemented in here\n");
300 EXPORT_SYMBOL(not_implemented);
302 int user_context(unsigned long sp)
306 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
307 return(stack != (unsigned long) current_thread);
310 extern void remove_umid_dir(void);
312 __uml_exitcall(remove_umid_dir);
314 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
316 void do_uml_exitcalls(void)
320 call = &__uml_exitcall_end;
321 while (--call >= &__uml_exitcall_begin)
325 char *uml_strdup(char *string)
329 new = kmalloc(strlen(string) + 1, GFP_KERNEL);
330 if(new == NULL) return(NULL);
335 int copy_to_user_proc(void __user *to, void *from, int size)
337 return(copy_to_user(to, from, size));
340 int copy_from_user_proc(void *to, void __user *from, int size)
342 return(copy_from_user(to, from, size));
345 int clear_user_proc(void __user *buf, int size)
347 return(clear_user(buf, size));
350 int strlen_user_proc(char __user *str)
352 return(strlen_user(str));
355 int smp_sigio_handler(void)
358 int cpu = current_thread->cpu;
366 int um_in_interrupt(void)
368 return(in_interrupt());
373 return(current_thread->cpu);
376 static atomic_t using_sysemu = ATOMIC_INIT(0);
377 int sysemu_supported;
379 void set_using_sysemu(int value)
381 if (value > sysemu_supported)
383 atomic_set(&using_sysemu, value);
386 int get_using_sysemu(void)
388 return atomic_read(&using_sysemu);
391 static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
393 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
399 static int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
403 if (copy_from_user(tmp, buf, 1))
406 if (tmp[0] >= '0' && tmp[0] <= '2')
407 set_using_sysemu(tmp[0] - '0');
408 return count; /*We use the first char, but pretend to write everything*/
411 int __init make_proc_sysemu(void)
413 struct proc_dir_entry *ent;
414 if (!sysemu_supported)
417 ent = create_proc_entry("sysemu", 0600, &proc_root);
421 printk("Failed to register /proc/sysemu\n");
425 ent->read_proc = proc_read_sysemu;
426 ent->write_proc = proc_write_sysemu;
431 late_initcall(make_proc_sysemu);
433 int singlestepping(void * t)
435 struct task_struct *task = t ? t : current;
437 if ( ! (task->ptrace & PT_DTRACE) )
440 if (task->thread.singlestep_syscall)
447 * Only x86 and x86_64 have an arch_align_stack().
448 * All other arches have "#define arch_align_stack(x) (x)"
449 * in their asm/system.h
450 * As this is included in UML from asm-um/system-generic.h,
451 * we can use it to behave as the subarch does.
453 #ifndef arch_align_stack
454 unsigned long arch_align_stack(unsigned long sp)
456 if (randomize_va_space)
457 sp -= get_random_int() % 8192;