2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright 2003 PathScale, Inc.
4 * Licensed under the GPL
7 #include "linux/kernel.h"
8 #include "linux/sched.h"
9 #include "linux/interrupt.h"
10 #include "linux/string.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/personality.h"
26 #include "asm/unistd.h"
28 #include "asm/segment.h"
30 #include "asm/pgtable.h"
31 #include "asm/processor.h"
32 #include "asm/tlbflush.h"
33 #include "asm/uaccess.h"
35 #include "user_util.h"
36 #include "kern_util.h"
37 #include "as-layout.h"
39 #include "signal_kern.h"
44 #include "frame_kern.h"
45 #include "sigcontext.h"
48 #include "mode_kern.h"
49 #include "choose-mode.h"
50 #include "um_malloc.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 int external_pid(void *t)
60 struct task_struct *task = t ? t : current;
62 return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
65 int pid_to_processor_id(int pid)
69 for(i = 0; i < ncpus; i++){
70 if(cpu_tasks[i].pid == pid) return(i);
75 void free_stack(unsigned long stack, int order)
77 free_pages(stack, order);
80 unsigned long alloc_stack(int order, int atomic)
83 gfp_t flags = GFP_KERNEL;
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,
101 ¤t->thread.regs, 0, NULL, 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(task)->cpu] = ((struct cpu_task)
112 { external_pid(task), task });
115 void *_switch_to(void *prev, void *next, void *last)
117 struct task_struct *from = prev;
118 struct task_struct *to= next;
120 to->thread.prev_sched = from;
124 current->thread.saved_task = NULL ;
125 CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next);
126 if(current->thread.saved_task)
127 show_regs(&(current->thread.regs));
128 next= current->thread.saved_task;
130 } while(current->thread.saved_task);
132 return(current->thread.prev_sched);
136 void interrupt_end(void)
138 if(need_resched()) schedule();
139 if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
142 void release_thread(struct task_struct *task)
144 CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
147 void exit_thread(void)
149 unprotect_stack((unsigned long) current_thread);
152 void *get_current(void)
157 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
158 unsigned long stack_top, struct task_struct * p,
159 struct pt_regs *regs)
163 p->thread = (struct thread_struct) INIT_THREAD;
164 ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
165 clone_flags, sp, stack_top, p, regs);
167 if (ret || !current->thread.forking)
170 clear_flushed_tls(p);
173 * Set a new TLS for the child thread?
175 if (clone_flags & CLONE_SETTLS)
176 ret = arch_copy_tls(p);
182 void initial_thread_cb(void (*proc)(void *), void *arg)
184 int save_kmalloc_ok = kmalloc_ok;
187 CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
189 kmalloc_ok = save_kmalloc_ok;
192 unsigned long stack_sp(unsigned long page)
194 return(page + PAGE_SIZE - sizeof(void *));
197 int current_pid(void)
199 return(current->pid);
202 void default_idle(void)
204 CHOOSE_MODE(uml_idle_timer(), (void) 0);
207 /* endless idle loop with no priority at all */
210 * although we are an idle CPU, we do not want to
211 * get into the scheduler unnecessarily.
222 CHOOSE_MODE(init_idle_tt(), init_idle_skas());
230 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
240 return(ERR_PTR(-EINVAL));
241 pgd = pgd_offset(task->mm, addr);
242 if(!pgd_present(*pgd))
243 return(ERR_PTR(-EINVAL));
245 pud = pud_offset(pgd, addr);
246 if(!pud_present(*pud))
247 return(ERR_PTR(-EINVAL));
249 pmd = pmd_offset(pud, addr);
250 if(!pmd_present(*pmd))
251 return(ERR_PTR(-EINVAL));
253 pte = pte_offset_kernel(pmd, addr);
255 if(!pte_present(ptent))
256 return(ERR_PTR(-EINVAL));
260 return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
263 char *current_cmd(void)
265 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
268 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
269 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
273 void force_sigbus(void)
275 printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
278 sigaddset(¤t->pending.signal, SIGBUS);
280 current->flags |= PF_SIGNALED;
281 do_exit(SIGBUS | 0x80);
284 void dump_thread(struct pt_regs *regs, struct user *u)
288 void enable_hlt(void)
293 EXPORT_SYMBOL(enable_hlt);
295 void disable_hlt(void)
297 panic("disable_hlt");
300 EXPORT_SYMBOL(disable_hlt);
302 void *um_kmalloc(int size)
304 return kmalloc(size, GFP_KERNEL);
307 void *um_kmalloc_atomic(int size)
309 return kmalloc(size, GFP_ATOMIC);
312 void *um_vmalloc(int size)
314 return vmalloc(size);
317 void *um_vmalloc_atomic(int size)
319 return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL);
322 int __cant_sleep(void) {
323 return in_atomic() || irqs_disabled() || in_interrupt();
324 /* Is in_interrupt() really needed? */
327 unsigned long get_fault_addr(void)
329 return((unsigned long) current->thread.fault_addr);
332 EXPORT_SYMBOL(get_fault_addr);
334 void not_implemented(void)
336 printk(KERN_DEBUG "Something isn't implemented in here\n");
339 EXPORT_SYMBOL(not_implemented);
341 int user_context(unsigned long sp)
345 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
346 return(stack != (unsigned long) current_thread);
349 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
351 void do_uml_exitcalls(void)
355 call = &__uml_exitcall_end;
356 while (--call >= &__uml_exitcall_begin)
360 char *uml_strdup(char *string)
362 return kstrdup(string, GFP_KERNEL);
365 int copy_to_user_proc(void __user *to, void *from, int size)
367 return(copy_to_user(to, from, size));
370 int copy_from_user_proc(void *to, void __user *from, int size)
372 return(copy_from_user(to, from, size));
375 int clear_user_proc(void __user *buf, int size)
377 return(clear_user(buf, size));
380 int strlen_user_proc(char __user *str)
382 return(strlen_user(str));
385 int smp_sigio_handler(void)
388 int cpu = current_thread->cpu;
398 return(current_thread->cpu);
401 static atomic_t using_sysemu = ATOMIC_INIT(0);
402 int sysemu_supported;
404 void set_using_sysemu(int value)
406 if (value > sysemu_supported)
408 atomic_set(&using_sysemu, value);
411 int get_using_sysemu(void)
413 return atomic_read(&using_sysemu);
416 static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
418 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
424 static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
428 if (copy_from_user(tmp, buf, 1))
431 if (tmp[0] >= '0' && tmp[0] <= '2')
432 set_using_sysemu(tmp[0] - '0');
433 return count; /*We use the first char, but pretend to write everything*/
436 int __init make_proc_sysemu(void)
438 struct proc_dir_entry *ent;
439 if (!sysemu_supported)
442 ent = create_proc_entry("sysemu", 0600, &proc_root);
446 printk(KERN_WARNING "Failed to register /proc/sysemu\n");
450 ent->read_proc = proc_read_sysemu;
451 ent->write_proc = proc_write_sysemu;
456 late_initcall(make_proc_sysemu);
458 int singlestepping(void * t)
460 struct task_struct *task = t ? t : current;
462 if ( ! (task->ptrace & PT_DTRACE) )
465 if (task->thread.singlestep_syscall)
472 * Only x86 and x86_64 have an arch_align_stack().
473 * All other arches have "#define arch_align_stack(x) (x)"
474 * in their asm/system.h
475 * As this is included in UML from asm-um/system-generic.h,
476 * we can use it to behave as the subarch does.
478 #ifndef arch_align_stack
479 unsigned long arch_align_stack(unsigned long sp)
481 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
482 sp -= get_random_int() % 8192;