ia64/linux-2.6.18-xen.hg

view arch/m68knommu/kernel/process.c @ 854:950b9eb27661

usbback: fix urb interval value for interrupt urbs.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Apr 06 13:51:20 2009 +0100 (2009-04-06)
parents 831230e53067
children
line source
1 /*
2 * linux/arch/m68knommu/kernel/process.c
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 *
6 * 68060 fixes by Jesper Skov
7 *
8 * uClinux changes
9 * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com>
10 */
12 /*
13 * This file handles the architecture-dependent parts of process handling..
14 */
16 #include <linux/module.h>
17 #include <linux/errno.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/mm.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/stddef.h>
24 #include <linux/unistd.h>
25 #include <linux/ptrace.h>
26 #include <linux/slab.h>
27 #include <linux/user.h>
28 #include <linux/a.out.h>
29 #include <linux/interrupt.h>
30 #include <linux/reboot.h>
32 #include <asm/uaccess.h>
33 #include <asm/system.h>
34 #include <asm/traps.h>
35 #include <asm/machdep.h>
36 #include <asm/setup.h>
37 #include <asm/pgtable.h>
39 asmlinkage void ret_from_fork(void);
41 /*
42 * The following aren't currently used.
43 */
44 void (*pm_idle)(void);
45 EXPORT_SYMBOL(pm_idle);
47 void (*pm_power_off)(void);
48 EXPORT_SYMBOL(pm_power_off);
50 /*
51 * The idle loop on an m68knommu..
52 */
53 static void default_idle(void)
54 {
55 local_irq_disable();
56 while (!need_resched()) {
57 /* This stop will re-enable interrupts */
58 __asm__("stop #0x2000" : : : "cc");
59 local_irq_disable();
60 }
61 local_irq_enable();
62 }
64 void (*idle)(void) = default_idle;
66 /*
67 * The idle thread. There's no useful work to be
68 * done, so just try to conserve power and have a
69 * low exit latency (ie sit in a loop waiting for
70 * somebody to say that they'd like to reschedule)
71 */
72 void cpu_idle(void)
73 {
74 /* endless idle loop with no priority at all */
75 while (1) {
76 idle();
77 preempt_enable_no_resched();
78 schedule();
79 preempt_disable();
80 }
81 }
83 void machine_restart(char * __unused)
84 {
85 if (mach_reset)
86 mach_reset();
87 for (;;);
88 }
90 void machine_halt(void)
91 {
92 if (mach_halt)
93 mach_halt();
94 for (;;);
95 }
97 void machine_power_off(void)
98 {
99 if (mach_power_off)
100 mach_power_off();
101 for (;;);
102 }
104 void show_regs(struct pt_regs * regs)
105 {
106 printk(KERN_NOTICE "\n");
107 printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
108 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
109 printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
110 regs->orig_d0, regs->d0, regs->a2, regs->a1);
111 printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
112 regs->a0, regs->d5, regs->d4);
113 printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
114 regs->d3, regs->d2, regs->d1);
115 if (!(regs->sr & PS_S))
116 printk(KERN_NOTICE "USP: %08lx\n", rdusp());
117 }
119 /*
120 * Create a kernel thread
121 */
122 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
123 {
124 int retval;
125 long clone_arg = flags | CLONE_VM;
126 mm_segment_t fs;
128 fs = get_fs();
129 set_fs(KERNEL_DS);
131 __asm__ __volatile__ (
132 "movel %%sp, %%d2\n\t"
133 "movel %5, %%d1\n\t"
134 "movel %1, %%d0\n\t"
135 "trap #0\n\t"
136 "cmpl %%sp, %%d2\n\t"
137 "jeq 1f\n\t"
138 "movel %3, %%sp@-\n\t"
139 "jsr %4@\n\t"
140 "movel %2, %%d0\n\t"
141 "trap #0\n"
142 "1:\n\t"
143 "movel %%d0, %0\n"
144 : "=d" (retval)
145 : "i" (__NR_clone),
146 "i" (__NR_exit),
147 "a" (arg),
148 "a" (fn),
149 "a" (clone_arg)
150 : "cc", "%d0", "%d1", "%d2");
152 set_fs(fs);
153 return retval;
154 }
156 void flush_thread(void)
157 {
158 #ifdef CONFIG_FPU
159 unsigned long zero = 0;
160 #endif
161 set_fs(USER_DS);
162 current->thread.fs = __USER_DS;
163 #ifdef CONFIG_FPU
164 if (!FPU_IS_EMU)
165 asm volatile (".chip 68k/68881\n\t"
166 "frestore %0@\n\t"
167 ".chip 68k" : : "a" (&zero));
168 #endif
169 }
171 /*
172 * "m68k_fork()".. By the time we get here, the
173 * non-volatile registers have also been saved on the
174 * stack. We do some ugly pointer stuff here.. (see
175 * also copy_thread)
176 */
178 asmlinkage int m68k_fork(struct pt_regs *regs)
179 {
180 /* fork almost works, enough to trick you into looking elsewhere :-( */
181 return(-EINVAL);
182 }
184 asmlinkage int m68k_vfork(struct pt_regs *regs)
185 {
186 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
187 }
189 asmlinkage int m68k_clone(struct pt_regs *regs)
190 {
191 unsigned long clone_flags;
192 unsigned long newsp;
194 /* syscall2 puts clone_flags in d1 and usp in d2 */
195 clone_flags = regs->d1;
196 newsp = regs->d2;
197 if (!newsp)
198 newsp = rdusp();
199 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
200 }
202 int copy_thread(int nr, unsigned long clone_flags,
203 unsigned long usp, unsigned long topstk,
204 struct task_struct * p, struct pt_regs * regs)
205 {
206 struct pt_regs * childregs;
207 struct switch_stack * childstack, *stack;
208 unsigned long *retp;
210 childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
212 *childregs = *regs;
213 childregs->d0 = 0;
215 retp = ((unsigned long *) regs);
216 stack = ((struct switch_stack *) retp) - 1;
218 childstack = ((struct switch_stack *) childregs) - 1;
219 *childstack = *stack;
220 childstack->retpc = (unsigned long)ret_from_fork;
222 p->thread.usp = usp;
223 p->thread.ksp = (unsigned long)childstack;
224 /*
225 * Must save the current SFC/DFC value, NOT the value when
226 * the parent was last descheduled - RGH 10-08-96
227 */
228 p->thread.fs = get_fs().seg;
230 #ifdef CONFIG_FPU
231 if (!FPU_IS_EMU) {
232 /* Copy the current fpu state */
233 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
235 if (p->thread.fpstate[0])
236 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
237 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
238 : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
239 : "memory");
240 /* Restore the state in case the fpu was busy */
241 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
242 }
243 #endif
245 return 0;
246 }
248 /* Fill in the fpu structure for a core dump. */
250 int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
251 {
252 #ifdef CONFIG_FPU
253 char fpustate[216];
255 if (FPU_IS_EMU) {
256 int i;
258 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
259 memcpy(fpu->fpregs, current->thread.fp, 96);
260 /* Convert internal fpu reg representation
261 * into long double format
262 */
263 for (i = 0; i < 24; i += 3)
264 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
265 ((fpu->fpregs[i] & 0x0000ffff) << 16);
266 return 1;
267 }
269 /* First dump the fpu context to avoid protocol violation. */
270 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
271 if (!fpustate[0])
272 return 0;
274 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
275 :: "m" (fpu->fpcntl[0])
276 : "memory");
277 asm volatile ("fmovemx %/fp0-%/fp7,%0"
278 :: "m" (fpu->fpregs[0])
279 : "memory");
280 #endif
281 return 1;
282 }
284 /*
285 * Generic dumping code. Used for panic and debug.
286 */
287 void dump(struct pt_regs *fp)
288 {
289 unsigned long *sp;
290 unsigned char *tp;
291 int i;
293 printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
294 printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
296 if (current->mm) {
297 printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
298 (int) current->mm->start_code,
299 (int) current->mm->end_code,
300 (int) current->mm->start_data,
301 (int) current->mm->end_data,
302 (int) current->mm->end_data,
303 (int) current->mm->brk);
304 printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
305 (int) current->mm->start_stack,
306 (int)(((unsigned long) current) + THREAD_SIZE));
307 }
309 printk(KERN_EMERG "PC: %08lx\n", fp->pc);
310 printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
311 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
312 fp->d0, fp->d1, fp->d2, fp->d3);
313 printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
314 fp->d4, fp->d5, fp->a0, fp->a1);
315 printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %08x\n", (unsigned int) rdusp(),
316 (unsigned int) fp);
318 printk(KERN_EMERG "\nCODE:");
319 tp = ((unsigned char *) fp->pc) - 0x20;
320 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
321 if ((i % 0x10) == 0)
322 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
323 printk(KERN_EMERG "%08x ", (int) *sp++);
324 }
325 printk(KERN_EMERG "\n");
327 printk(KERN_EMERG "\nKERNEL STACK:");
328 tp = ((unsigned char *) fp) - 0x40;
329 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
330 if ((i % 0x10) == 0)
331 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
332 printk(KERN_EMERG "%08x ", (int) *sp++);
333 }
334 printk(KERN_EMERG "\n");
335 printk(KERN_EMERG "\n");
337 printk(KERN_EMERG "\nUSER STACK:");
338 tp = (unsigned char *) (rdusp() - 0x10);
339 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
340 if ((i % 0x10) == 0)
341 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
342 printk(KERN_EMERG "%08x ", (int) *sp++);
343 }
344 printk(KERN_EMERG "\n\n");
345 }
347 /*
348 * sys_execve() executes a new program.
349 */
350 asmlinkage int sys_execve(char *name, char **argv, char **envp)
351 {
352 int error;
353 char * filename;
354 struct pt_regs *regs = (struct pt_regs *) &name;
356 lock_kernel();
357 filename = getname(name);
358 error = PTR_ERR(filename);
359 if (IS_ERR(filename))
360 goto out;
361 error = do_execve(filename, argv, envp, regs);
362 putname(filename);
363 out:
364 unlock_kernel();
365 return error;
366 }
368 unsigned long get_wchan(struct task_struct *p)
369 {
370 unsigned long fp, pc;
371 unsigned long stack_page;
372 int count = 0;
373 if (!p || p == current || p->state == TASK_RUNNING)
374 return 0;
376 stack_page = (unsigned long)p;
377 fp = ((struct switch_stack *)p->thread.ksp)->a6;
378 do {
379 if (fp < stack_page+sizeof(struct thread_info) ||
380 fp >= 8184+stack_page)
381 return 0;
382 pc = ((unsigned long *)fp)[1];
383 if (!in_sched_functions(pc))
384 return pc;
385 fp = *(unsigned long *) fp;
386 } while (count++ < 16);
387 return 0;
388 }
390 /*
391 * Return saved PC of a blocked thread.
392 */
393 unsigned long thread_saved_pc(struct task_struct *tsk)
394 {
395 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
397 /* Check whether the thread is blocked in resume() */
398 if (in_sched_functions(sw->retpc))
399 return ((unsigned long *)sw->a6)[1];
400 else
401 return sw->retpc;
402 }