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11#include <stdarg.h>
12
13#include <linux/errno.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/stddef.h>
19#include <linux/ptrace.h>
20#include <linux/slab.h>
21#include <linux/user.h>
22#include <linux/smp.h>
23#include <linux/reboot.h>
24#include <linux/delay.h>
25#include <linux/pm.h>
26#include <linux/init.h>
27
28#include <asm/auxio.h>
29#include <asm/oplib.h>
30#include <asm/uaccess.h>
31#include <asm/system.h>
32#include <asm/page.h>
33#include <asm/pgalloc.h>
34#include <asm/pgtable.h>
35#include <asm/delay.h>
36#include <asm/processor.h>
37#include <asm/psr.h>
38#include <asm/elf.h>
39#include <asm/prom.h>
40#include <asm/unistd.h>
41
42
43
44
45
46void (*pm_idle)(void);
47EXPORT_SYMBOL(pm_idle);
48
49
50
51
52
53
54void (*pm_power_off)(void) = machine_power_off;
55EXPORT_SYMBOL(pm_power_off);
56
57
58
59
60
61int scons_pwroff = 1;
62
63extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
64
65struct task_struct *last_task_used_math = NULL;
66struct thread_info *current_set[NR_CPUS];
67
68#ifndef CONFIG_SMP
69
70#define SUN4C_FAULT_HIGH 100
71
72
73
74
75void cpu_idle(void)
76{
77
78 for (;;) {
79 if (ARCH_SUN4C) {
80 static int count = HZ;
81 static unsigned long last_jiffies;
82 static unsigned long last_faults;
83 static unsigned long fps;
84 unsigned long now;
85 unsigned long faults;
86
87 extern unsigned long sun4c_kernel_faults;
88 extern void sun4c_grow_kernel_ring(void);
89
90 local_irq_disable();
91 now = jiffies;
92 count -= (now - last_jiffies);
93 last_jiffies = now;
94 if (count < 0) {
95 count += HZ;
96 faults = sun4c_kernel_faults;
97 fps = (fps + (faults - last_faults)) >> 1;
98 last_faults = faults;
99#if 0
100 printk("kernel faults / second = %ld\n", fps);
101#endif
102 if (fps >= SUN4C_FAULT_HIGH) {
103 sun4c_grow_kernel_ring();
104 }
105 }
106 local_irq_enable();
107 }
108
109 if (pm_idle) {
110 while (!need_resched())
111 (*pm_idle)();
112 } else {
113 while (!need_resched())
114 cpu_relax();
115 }
116 preempt_enable_no_resched();
117 schedule();
118 preempt_disable();
119 check_pgt_cache();
120 }
121}
122
123#else
124
125
126void cpu_idle(void)
127{
128 set_thread_flag(TIF_POLLING_NRFLAG);
129
130 while(1) {
131 while (!need_resched())
132 cpu_relax();
133 preempt_enable_no_resched();
134 schedule();
135 preempt_disable();
136 check_pgt_cache();
137 }
138}
139
140#endif
141
142
143void machine_halt(void)
144{
145 local_irq_enable();
146 mdelay(8);
147 local_irq_disable();
148 prom_halt();
149 panic("Halt failed!");
150}
151
152void machine_restart(char * cmd)
153{
154 char *p;
155
156 local_irq_enable();
157 mdelay(8);
158 local_irq_disable();
159
160 p = strchr (reboot_command, '\n');
161 if (p) *p = 0;
162 if (cmd)
163 prom_reboot(cmd);
164 if (*reboot_command)
165 prom_reboot(reboot_command);
166 prom_feval ("reset");
167 panic("Reboot failed!");
168}
169
170void machine_power_off(void)
171{
172 if (auxio_power_register &&
173 (strcmp(of_console_device->type, "serial") || scons_pwroff))
174 *auxio_power_register |= AUXIO_POWER_OFF;
175 machine_halt();
176}
177
178#if 0
179
180static DEFINE_SPINLOCK(sparc_backtrace_lock);
181
182void __show_backtrace(unsigned long fp)
183{
184 struct reg_window32 *rw;
185 unsigned long flags;
186 int cpu = smp_processor_id();
187
188 spin_lock_irqsave(&sparc_backtrace_lock, flags);
189
190 rw = (struct reg_window32 *)fp;
191 while(rw && (((unsigned long) rw) >= PAGE_OFFSET) &&
192 !(((unsigned long) rw) & 0x7)) {
193 printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] "
194 "FP[%08lx] CALLER[%08lx]: ", cpu,
195 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
196 rw->ins[4], rw->ins[5],
197 rw->ins[6],
198 rw->ins[7]);
199 printk("%pS\n", (void *) rw->ins[7]);
200 rw = (struct reg_window32 *) rw->ins[6];
201 }
202 spin_unlock_irqrestore(&sparc_backtrace_lock, flags);
203}
204
205#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
206#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
207#define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp))
208
209void show_backtrace(void)
210{
211 unsigned long fp;
212
213 __SAVE; __SAVE; __SAVE; __SAVE;
214 __SAVE; __SAVE; __SAVE; __SAVE;
215 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
216 __RESTORE; __RESTORE; __RESTORE; __RESTORE;
217
218 __GET_FP(fp);
219
220 __show_backtrace(fp);
221}
222
223#ifdef CONFIG_SMP
224void smp_show_backtrace_all_cpus(void)
225{
226 xc0((smpfunc_t) show_backtrace);
227 show_backtrace();
228}
229#endif
230
231void show_stackframe(struct sparc_stackf *sf)
232{
233 unsigned long size;
234 unsigned long *stk;
235 int i;
236
237 printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
238 "l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
239 sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
240 sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
241 printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
242 "i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
243 sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
244 sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
245 printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx "
246 "x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n",
247 (unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
248 sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
249 sf->xxargs[0]);
250 size = ((unsigned long)sf->fp) - ((unsigned long)sf);
251 size -= STACKFRAME_SZ;
252 stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
253 i = 0;
254 do {
255 printk("s%d: %08lx\n", i++, *stk++);
256 } while ((size -= sizeof(unsigned long)));
257}
258#endif
259
260void show_regs(struct pt_regs *r)
261{
262 struct reg_window32 *rw = (struct reg_window32 *) r->u_regs[14];
263
264 printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
265 r->psr, r->pc, r->npc, r->y, print_tainted());
266 printk("PC: <%pS>\n", (void *) r->pc);
267 printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
268 r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
269 r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
270 printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
271 r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
272 r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
273 printk("RPC: <%pS>\n", (void *) r->u_regs[15]);
274
275 printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
276 rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
277 rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
278 printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
279 rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
280 rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
281}
282
283
284
285
286
287void show_stack(struct task_struct *tsk, unsigned long *_ksp)
288{
289 unsigned long pc, fp;
290 unsigned long task_base;
291 struct reg_window32 *rw;
292 int count = 0;
293
294 if (tsk != NULL)
295 task_base = (unsigned long) task_stack_page(tsk);
296 else
297 task_base = (unsigned long) current_thread_info();
298
299 fp = (unsigned long) _ksp;
300 do {
301
302 if (fp < (task_base + sizeof(struct thread_info)) ||
303 fp >= (task_base + (PAGE_SIZE << 1)))
304 break;
305 rw = (struct reg_window32 *) fp;
306 pc = rw->ins[7];
307 printk("[%08lx : ", pc);
308 printk("%pS ] ", (void *) pc);
309 fp = rw->ins[6];
310 } while (++count < 16);
311 printk("\n");
312}
313
314void dump_stack(void)
315{
316 unsigned long *ksp;
317
318 __asm__ __volatile__("mov %%fp, %0"
319 : "=r" (ksp));
320 show_stack(current, ksp);
321}
322
323EXPORT_SYMBOL(dump_stack);
324
325
326
327
328unsigned long thread_saved_pc(struct task_struct *tsk)
329{
330 return task_thread_info(tsk)->kpc;
331}
332
333
334
335
336void exit_thread(void)
337{
338#ifndef CONFIG_SMP
339 if(last_task_used_math == current) {
340#else
341 if (test_thread_flag(TIF_USEDFPU)) {
342#endif
343
344 put_psr(get_psr() | PSR_EF);
345 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
346 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
347#ifndef CONFIG_SMP
348 last_task_used_math = NULL;
349#else
350 clear_thread_flag(TIF_USEDFPU);
351#endif
352 }
353}
354
355void flush_thread(void)
356{
357 current_thread_info()->w_saved = 0;
358
359#ifndef CONFIG_SMP
360 if(last_task_used_math == current) {
361#else
362 if (test_thread_flag(TIF_USEDFPU)) {
363#endif
364
365 put_psr(get_psr() | PSR_EF);
366 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
367 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
368#ifndef CONFIG_SMP
369 last_task_used_math = NULL;
370#else
371 clear_thread_flag(TIF_USEDFPU);
372#endif
373 }
374
375
376 current->thread.current_ds = USER_DS;
377 if (current->thread.flags & SPARC_FLAG_KTHREAD) {
378 current->thread.flags &= ~SPARC_FLAG_KTHREAD;
379
380
381
382 current->thread.kregs = (struct pt_regs *)
383 (task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
384 }
385}
386
387static inline struct sparc_stackf __user *
388clone_stackframe(struct sparc_stackf __user *dst,
389 struct sparc_stackf __user *src)
390{
391 unsigned long size, fp;
392 struct sparc_stackf *tmp;
393 struct sparc_stackf __user *sp;
394
395 if (get_user(tmp, &src->fp))
396 return NULL;
397
398 fp = (unsigned long) tmp;
399 size = (fp - ((unsigned long) src));
400 fp = (unsigned long) dst;
401 sp = (struct sparc_stackf __user *)(fp - size);
402
403
404
405
406
407 if (__copy_user(sp, src, size))
408 sp = NULL;
409 else if (put_user(fp, &sp->fp))
410 sp = NULL;
411
412 return sp;
413}
414
415asmlinkage int sparc_do_fork(unsigned long clone_flags,
416 unsigned long stack_start,
417 struct pt_regs *regs,
418 unsigned long stack_size)
419{
420 unsigned long parent_tid_ptr, child_tid_ptr;
421 unsigned long orig_i1 = regs->u_regs[UREG_I1];
422 long ret;
423
424 parent_tid_ptr = regs->u_regs[UREG_I2];
425 child_tid_ptr = regs->u_regs[UREG_I4];
426
427 ret = do_fork(clone_flags, stack_start,
428 regs, stack_size,
429 (int __user *) parent_tid_ptr,
430 (int __user *) child_tid_ptr);
431
432
433
434
435
436
437 if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
438 regs->u_regs[UREG_I1] = orig_i1;
439
440 return ret;
441}
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456extern void ret_from_fork(void);
457
458int copy_thread(unsigned long clone_flags, unsigned long sp,
459 unsigned long unused,
460 struct task_struct *p, struct pt_regs *regs)
461{
462 struct thread_info *ti = task_thread_info(p);
463 struct pt_regs *childregs;
464 char *new_stack;
465
466#ifndef CONFIG_SMP
467 if(last_task_used_math == current) {
468#else
469 if (test_thread_flag(TIF_USEDFPU)) {
470#endif
471 put_psr(get_psr() | PSR_EF);
472 fpsave(&p->thread.float_regs[0], &p->thread.fsr,
473 &p->thread.fpqueue[0], &p->thread.fpqdepth);
474#ifdef CONFIG_SMP
475 clear_thread_flag(TIF_USEDFPU);
476#endif
477 }
478
479
480
481
482
483
484
485 new_stack = task_stack_page(p) + THREAD_SIZE;
486 if (regs->psr & PSR_PS)
487 new_stack -= STACKFRAME_SZ;
488 new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
489 memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
490 childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
491
492
493
494
495
496
497
498
499 ti->ksp = (unsigned long) new_stack;
500 ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
501 ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
502 ti->kwim = current->thread.fork_kwim;
503
504 if(regs->psr & PSR_PS) {
505 extern struct pt_regs fake_swapper_regs;
506
507 p->thread.kregs = &fake_swapper_regs;
508 new_stack += STACKFRAME_SZ + TRACEREG_SZ;
509 childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
510 p->thread.flags |= SPARC_FLAG_KTHREAD;
511 p->thread.current_ds = KERNEL_DS;
512 memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
513 childregs->u_regs[UREG_G6] = (unsigned long) ti;
514 } else {
515 p->thread.kregs = childregs;
516 childregs->u_regs[UREG_FP] = sp;
517 p->thread.flags &= ~SPARC_FLAG_KTHREAD;
518 p->thread.current_ds = USER_DS;
519
520 if (sp != regs->u_regs[UREG_FP]) {
521 struct sparc_stackf __user *childstack;
522 struct sparc_stackf __user *parentstack;
523
524
525
526
527
528 childstack = (struct sparc_stackf __user *)
529 (sp & ~0x7UL);
530 parentstack = (struct sparc_stackf __user *)
531 regs->u_regs[UREG_FP];
532
533#if 0
534 printk("clone: parent stack:\n");
535 show_stackframe(parentstack);
536#endif
537
538 childstack = clone_stackframe(childstack, parentstack);
539 if (!childstack)
540 return -EFAULT;
541
542#if 0
543 printk("clone: child stack:\n");
544 show_stackframe(childstack);
545#endif
546
547 childregs->u_regs[UREG_FP] = (unsigned long)childstack;
548 }
549 }
550
551#ifdef CONFIG_SMP
552
553 childregs->psr &= ~PSR_EF;
554#endif
555
556
557 childregs->u_regs[UREG_I0] = current->pid;
558 childregs->u_regs[UREG_I1] = 1;
559
560
561 regs->u_regs[UREG_I1] = 0;
562
563 if (clone_flags & CLONE_SETTLS)
564 childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
565
566 return 0;
567}
568
569
570
571
572int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
573{
574 if (used_math()) {
575 memset(fpregs, 0, sizeof(*fpregs));
576 fpregs->pr_q_entrysize = 8;
577 return 1;
578 }
579#ifdef CONFIG_SMP
580 if (test_thread_flag(TIF_USEDFPU)) {
581 put_psr(get_psr() | PSR_EF);
582 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
583 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
584 if (regs != NULL) {
585 regs->psr &= ~(PSR_EF);
586 clear_thread_flag(TIF_USEDFPU);
587 }
588 }
589#else
590 if (current == last_task_used_math) {
591 put_psr(get_psr() | PSR_EF);
592 fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
593 ¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
594 if (regs != NULL) {
595 regs->psr &= ~(PSR_EF);
596 last_task_used_math = NULL;
597 }
598 }
599#endif
600 memcpy(&fpregs->pr_fr.pr_regs[0],
601 ¤t->thread.float_regs[0],
602 (sizeof(unsigned long) * 32));
603 fpregs->pr_fsr = current->thread.fsr;
604 fpregs->pr_qcnt = current->thread.fpqdepth;
605 fpregs->pr_q_entrysize = 8;
606 fpregs->pr_en = 1;
607 if(fpregs->pr_qcnt != 0) {
608 memcpy(&fpregs->pr_q[0],
609 ¤t->thread.fpqueue[0],
610 sizeof(struct fpq) * fpregs->pr_qcnt);
611 }
612
613 memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
614 sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
615 return 1;
616}
617
618
619
620
621
622asmlinkage int sparc_execve(struct pt_regs *regs)
623{
624 int error, base = 0;
625 char *filename;
626
627
628 if(regs->u_regs[UREG_G1] == 0)
629 base = 1;
630
631 filename = getname((char __user *)regs->u_regs[base + UREG_I0]);
632 error = PTR_ERR(filename);
633 if(IS_ERR(filename))
634 goto out;
635 error = do_execve(filename,
636 (char __user * __user *)regs->u_regs[base + UREG_I1],
637 (char __user * __user *)regs->u_regs[base + UREG_I2],
638 regs);
639 putname(filename);
640out:
641 return error;
642}
643
644
645
646
647
648
649
650
651
652pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
653{
654 long retval;
655
656 __asm__ __volatile__("mov %4, %%g2\n\t"
657 "mov %5, %%g3\n\t"
658 "mov %1, %%g1\n\t"
659 "mov %2, %%o0\n\t"
660 "mov 0, %%o1\n\t"
661 "t 0x10\n\t"
662 "cmp %%o1, 0\n\t"
663 "be 1f\n\t"
664 " nop\n\t"
665 "jmpl %%g2, %%o7\n\t"
666 " mov %%g3, %%o0\n\t"
667 "mov %3, %%g1\n\t"
668 "t 0x10\n\t"
669
670 "1: mov %%o0, %0\n\t" :
671 "=r" (retval) :
672 "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED),
673 "i" (__NR_exit), "r" (fn), "r" (arg) :
674 "g1", "g2", "g3", "o0", "o1", "memory", "cc");
675 return retval;
676}
677EXPORT_SYMBOL(kernel_thread);
678
679unsigned long get_wchan(struct task_struct *task)
680{
681 unsigned long pc, fp, bias = 0;
682 unsigned long task_base = (unsigned long) task;
683 unsigned long ret = 0;
684 struct reg_window32 *rw;
685 int count = 0;
686
687 if (!task || task == current ||
688 task->state == TASK_RUNNING)
689 goto out;
690
691 fp = task_thread_info(task)->ksp + bias;
692 do {
693
694 if (fp < (task_base + sizeof(struct thread_info)) ||
695 fp >= (task_base + (2 * PAGE_SIZE)))
696 break;
697 rw = (struct reg_window32 *) fp;
698 pc = rw->ins[7];
699 if (!in_sched_functions(pc)) {
700 ret = pc;
701 goto out;
702 }
703 fp = rw->ins[6] + bias;
704 } while (++count < 16);
705
706out:
707 return ret;
708}
709
710