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 "asm/unistd.h"
26 #include "asm/segment.h"
28 #include "asm/pgtable.h"
29 #include "asm/processor.h"
30 #include "asm/tlbflush.h"
31 #include "asm/uaccess.h"
33 #include "user_util.h"
34 #include "kern_util.h"
36 #include "signal_kern.h"
37 #include "signal_user.h"
41 #include "time_user.h"
43 #include "frame_kern.h"
44 #include "sigcontext.h"
45 #include "2_5compat.h"
48 #include "mode_kern.h"
49 #include "choose-mode.h"
51 /* This is a per-cpu array. A processor only modifies its entry and it only
52 * cares about its entry, so it's OK if another processor is modifying its
55 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
57 struct task_struct *get_task(int pid, int require)
59 struct task_struct *ret;
61 read_lock(&tasklist_lock);
62 ret = find_task_by_pid(pid);
63 read_unlock(&tasklist_lock);
65 if(require && (ret == NULL)) panic("get_task couldn't find a task\n");
69 int external_pid(void *t)
71 struct task_struct *task = t ? t : current;
73 return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
76 int pid_to_processor_id(int pid)
80 for(i = 0; i < ncpus; i++){
81 if(cpu_tasks[i].pid == pid) return(i);
86 void free_stack(unsigned long stack, int order)
88 free_pages(stack, order);
91 unsigned long alloc_stack(int order, int atomic)
94 int flags = GFP_KERNEL;
96 if(atomic) flags |= GFP_ATOMIC;
97 page = __get_free_pages(flags, order);
100 stack_protections(page);
104 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
108 current->thread.request.u.thread.proc = fn;
109 current->thread.request.u.thread.arg = arg;
110 pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, NULL, 0, NULL,
113 panic("do_fork failed in kernel_thread, errno = %d", pid);
117 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
118 struct task_struct *tsk)
120 int cpu = smp_processor_id();
123 cpu_clear(cpu, prev->cpu_vm_mask);
124 cpu_set(cpu, next->cpu_vm_mask);
127 void set_current(void *t)
129 struct task_struct *task = t;
131 cpu_tasks[task->thread_info->cpu] = ((struct cpu_task)
132 { external_pid(task), task });
135 void *_switch_to(void *prev, void *next, void *last)
137 return(CHOOSE_MODE(switch_to_tt(prev, next),
138 switch_to_skas(prev, next)));
141 void interrupt_end(void)
143 if(need_resched()) schedule();
144 if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
147 void release_thread(struct task_struct *task)
149 CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
152 void exit_thread(void)
154 CHOOSE_MODE(exit_thread_tt(), exit_thread_skas());
155 unprotect_stack((unsigned long) current_thread);
158 void *get_current(void)
163 void prepare_to_copy(struct task_struct *tsk)
167 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
168 unsigned long stack_top, struct task_struct * p,
169 struct pt_regs *regs)
171 p->thread = (struct thread_struct) INIT_THREAD;
172 return(CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
173 clone_flags, sp, stack_top, p, regs));
176 void initial_thread_cb(void (*proc)(void *), void *arg)
178 int save_kmalloc_ok = kmalloc_ok;
181 CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
183 kmalloc_ok = save_kmalloc_ok;
186 unsigned long stack_sp(unsigned long page)
188 return(page + PAGE_SIZE - sizeof(void *));
191 int current_pid(void)
193 return(current->pid);
196 void default_idle(void)
200 atomic_inc(&init_mm.mm_count);
201 current->mm = &init_mm;
202 current->active_mm = &init_mm;
205 /* endless idle loop with no priority at all */
209 * although we are an idle CPU, we do not want to
210 * get into the scheduler unnecessarily.
221 CHOOSE_MODE(init_idle_tt(), init_idle_skas());
229 unsigned long page_mask(void)
234 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
243 return(ERR_PTR(-EINVAL));
244 pgd = pgd_offset(task->mm, addr);
245 if(!pgd_present(*pgd))
246 return(ERR_PTR(-EINVAL));
248 pud = pud_offset(pgd, addr);
249 if(!pud_present(*pud))
250 return(ERR_PTR(-EINVAL));
252 pmd = pmd_offset(pud, addr);
253 if(!pmd_present(*pmd))
254 return(ERR_PTR(-EINVAL));
256 pte = pte_offset_kernel(pmd, addr);
257 if(!pte_present(*pte))
258 return(ERR_PTR(-EINVAL));
262 return((void *) (pte_val(*pte) & PAGE_MASK) + (addr & ~PAGE_MASK));
265 char *current_cmd(void)
267 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
270 void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
271 return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
275 void force_sigbus(void)
277 printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
280 sigaddset(¤t->pending.signal, SIGBUS);
282 current->flags |= PF_SIGNALED;
283 do_exit(SIGBUS | 0x80);
286 void dump_thread(struct pt_regs *regs, struct user *u)
290 void enable_hlt(void)
295 EXPORT_SYMBOL(enable_hlt);
297 void disable_hlt(void)
299 panic("disable_hlt");
302 EXPORT_SYMBOL(disable_hlt);
304 void *um_kmalloc(int size)
306 return(kmalloc(size, GFP_KERNEL));
309 void *um_kmalloc_atomic(int size)
311 return(kmalloc(size, GFP_ATOMIC));
314 void *um_vmalloc(int size)
316 return(vmalloc(size));
319 unsigned long get_fault_addr(void)
321 return((unsigned long) current->thread.fault_addr);
324 EXPORT_SYMBOL(get_fault_addr);
326 void not_implemented(void)
328 printk(KERN_DEBUG "Something isn't implemented in here\n");
331 EXPORT_SYMBOL(not_implemented);
333 int user_context(unsigned long sp)
337 stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
338 return(stack != (unsigned long) current_thread);
341 extern void remove_umid_dir(void);
343 __uml_exitcall(remove_umid_dir);
345 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
347 void do_uml_exitcalls(void)
351 call = &__uml_exitcall_end;
352 while (--call >= &__uml_exitcall_begin)
356 char *uml_strdup(char *string)
360 new = kmalloc(strlen(string) + 1, GFP_KERNEL);
361 if(new == NULL) return(NULL);
366 void *get_init_task(void)
368 return(&init_thread_union.thread_info.task);
371 int copy_to_user_proc(void __user *to, void *from, int size)
373 return(copy_to_user(to, from, size));
376 int copy_from_user_proc(void *to, void __user *from, int size)
378 return(copy_from_user(to, from, size));
381 int clear_user_proc(void __user *buf, int size)
383 return(clear_user(buf, size));
386 int strlen_user_proc(char __user *str)
388 return(strlen_user(str));
391 int smp_sigio_handler(void)
394 int cpu = current_thread->cpu;
402 int um_in_interrupt(void)
404 return(in_interrupt());
409 return(current_thread->cpu);
412 static atomic_t using_sysemu = ATOMIC_INIT(0);
413 int sysemu_supported;
415 void set_using_sysemu(int value)
417 if (value > sysemu_supported)
419 atomic_set(&using_sysemu, value);
422 int get_using_sysemu(void)
424 return atomic_read(&using_sysemu);
427 static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
429 if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
435 static int proc_write_sysemu(struct file *file,const char *buf, unsigned long count,void *data)
439 if (copy_from_user(tmp, buf, 1))
442 if (tmp[0] >= '0' && tmp[0] <= '2')
443 set_using_sysemu(tmp[0] - '0');
444 return count; /*We use the first char, but pretend to write everything*/
447 int __init make_proc_sysemu(void)
449 struct proc_dir_entry *ent;
450 if (!sysemu_supported)
453 ent = create_proc_entry("sysemu", 0600, &proc_root);
457 printk("Failed to register /proc/sysemu\n");
461 ent->read_proc = proc_read_sysemu;
462 ent->write_proc = proc_write_sysemu;
467 late_initcall(make_proc_sysemu);
469 int singlestepping(void * t)
471 struct task_struct *task = t ? t : current;
473 if ( ! (task->ptrace & PT_DTRACE) )
476 if (task->thread.singlestep_syscall)
483 * Overrides for Emacs so that we follow Linus's tabbing style.
484 * Emacs will notice this stuff at the end of the file and automatically
485 * adjust the settings for this buffer only. This must remain at the end
487 * ---------------------------------------------------------------------------
489 * c-file-style: "linux"