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 "kern_util.h"
36 #include "as-layout.h"
38 #include "signal_kern.h"
43 #include "frame_kern.h"
44 #include "sigcontext.h"
47 #include "mode_kern.h"
49 /* This is a per-cpu array. A processor only modifies its entry and it only
50 * cares about its entry, so it's OK if another processor is modifying its
53 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
55 static inline int external_pid(struct task_struct *task)
57 return external_pid_skas(task);
60 int pid_to_processor_id(int pid)
64 for(i = 0; i < ncpus; i++){
65 if(cpu_tasks[i].pid == pid)
71 void free_stack(unsigned long stack, int order)
73 free_pages(stack, order);
76 unsigned long alloc_stack(int order, int atomic)
79 gfp_t flags = GFP_KERNEL;
83 page = __get_free_pages(flags, order);
90 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
94 current->thread.request.u.thread.proc = fn;
95 current->thread.request.u.thread.arg = arg;
96 pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
97 ¤t->thread.regs, 0, NULL, NULL);
101 static inline void set_current(struct task_struct *task)
103 cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
104 { external_pid(task), task });
107 void *_switch_to(void *prev, void *next, void *last)
109 struct task_struct *from = prev;
110 struct task_struct *to= next;
112 to->thread.prev_sched = from;
116 current->thread.saved_task = NULL;
117 switch_to_skas(prev, next);
118 if(current->thread.saved_task)
119 show_regs(&(current->thread.regs));
120 next= current->thread.saved_task;
122 } while(current->thread.saved_task);
124 return current->thread.prev_sched;
128 void interrupt_end(void)
132 if(test_tsk_thread_flag(current, TIF_SIGPENDING))
136 void release_thread(struct task_struct *task)
138 release_thread_skas(task);
141 void exit_thread(void)
145 void *get_current(void)
150 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
151 unsigned long stack_top, struct task_struct * p,
152 struct pt_regs *regs)
156 p->thread = (struct thread_struct) INIT_THREAD;
157 ret = copy_thread_skas(nr, clone_flags, sp, stack_top, p, regs);
159 if (ret || !current->thread.forking)
162 clear_flushed_tls(p);
165 * Set a new TLS for the child thread?
167 if (clone_flags & CLONE_SETTLS)
168 ret = arch_copy_tls(p);
174 void initial_thread_cb(void (*proc)(void *), void *arg)
176 int save_kmalloc_ok = kmalloc_ok;
179 initial_thread_cb_skas(proc, arg);
180 kmalloc_ok = save_kmalloc_ok;
183 void default_idle(void)
186 /* endless idle loop with no priority at all */
189 * although we are an idle CPU, we do not want to
190 * get into the scheduler unnecessarily.
204 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
214 return ERR_PTR(-EINVAL);
215 pgd = pgd_offset(task->mm, addr);
216 if(!pgd_present(*pgd))
217 return ERR_PTR(-EINVAL);
219 pud = pud_offset(pgd, addr);
220 if(!pud_present(*pud))
221 return ERR_PTR(-EINVAL);
223 pmd = pmd_offset(pud, addr);
224 if(!pmd_present(*pmd))
225 return ERR_PTR(-EINVAL);
227 pte = pte_offset_kernel(pmd, addr);
229 if(!pte_present(ptent))
230 return ERR_PTR(-EINVAL);
234 return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK);
237 char *current_cmd(void)
239 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
242 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
243 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
247 void dump_thread(struct pt_regs *regs, struct user *u)
251 int __cant_sleep(void) {
252 return in_atomic() || irqs_disabled() || in_interrupt();
253 /* Is in_interrupt() really needed? */
256 int user_context(unsigned long sp)
260 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
261 return stack != (unsigned long) current_thread;
264 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
266 void do_uml_exitcalls(void)
270 call = &__uml_exitcall_end;
271 while (--call >= &__uml_exitcall_begin)
275 char *uml_strdup(char *string)
277 return kstrdup(string, GFP_KERNEL);
280 int copy_to_user_proc(void __user *to, void *from, int size)
282 return copy_to_user(to, from, size);
285 int copy_from_user_proc(void *to, void __user *from, int size)
287 return copy_from_user(to, from, size);
290 int clear_user_proc(void __user *buf, int size)
292 return clear_user(buf, size);
295 int strlen_user_proc(char __user *str)
297 return strlen_user(str);
300 int smp_sigio_handler(void)
303 int cpu = current_thread->cpu;
313 return current_thread->cpu;
316 static atomic_t using_sysemu = ATOMIC_INIT(0);
317 int sysemu_supported;
319 void set_using_sysemu(int value)
321 if (value > sysemu_supported)
323 atomic_set(&using_sysemu, value);
326 int get_using_sysemu(void)
328 return atomic_read(&using_sysemu);
331 static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
333 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
339 static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
343 if (copy_from_user(tmp, buf, 1))
346 if (tmp[0] >= '0' && tmp[0] <= '2')
347 set_using_sysemu(tmp[0] - '0');
348 return count; /*We use the first char, but pretend to write everything*/
351 int __init make_proc_sysemu(void)
353 struct proc_dir_entry *ent;
354 if (!sysemu_supported)
357 ent = create_proc_entry("sysemu", 0600, &proc_root);
361 printk(KERN_WARNING "Failed to register /proc/sysemu\n");
365 ent->read_proc = proc_read_sysemu;
366 ent->write_proc = proc_write_sysemu;
371 late_initcall(make_proc_sysemu);
373 int singlestepping(void * t)
375 struct task_struct *task = t ? t : current;
377 if ( ! (task->ptrace & PT_DTRACE) )
380 if (task->thread.singlestep_syscall)
387 * Only x86 and x86_64 have an arch_align_stack().
388 * All other arches have "#define arch_align_stack(x) (x)"
389 * in their asm/system.h
390 * As this is included in UML from asm-um/system-generic.h,
391 * we can use it to behave as the subarch does.
393 #ifndef arch_align_stack
394 unsigned long arch_align_stack(unsigned long sp)
396 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
397 sp -= get_random_int() % 8192;