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11#include <linux/errno.h>
12#include <linux/module.h>
13#include <linux/sched.h>
14#include <linux/kernel.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/stddef.h>
18#include <linux/unistd.h>
19#include <linux/ptrace.h>
20#include <linux/user.h>
21#include <linux/time.h>
22#include <linux/major.h>
23#include <linux/stat.h>
24#include <linux/vt.h>
25#include <linux/mman.h>
26#include <linux/elfcore.h>
27#include <linux/reboot.h>
28#include <linux/tty.h>
29#include <linux/console.h>
30#include <linux/slab.h>
31#include <linux/rcupdate.h>
32
33#include <asm/reg.h>
34#include <asm/uaccess.h>
35#include <asm/io.h>
36#include <asm/pgtable.h>
37#include <asm/hwrpb.h>
38#include <asm/fpu.h>
39
40#include "proto.h"
41#include "pci_impl.h"
42
43
44
45
46void (*pm_power_off)(void) = machine_power_off;
47EXPORT_SYMBOL(pm_power_off);
48
49void
50cpu_idle(void)
51{
52 current_thread_info()->status |= TS_POLLING;
53
54 while (1) {
55
56
57
58 rcu_idle_enter();
59 while (!need_resched())
60 cpu_relax();
61
62 rcu_idle_exit();
63 schedule_preempt_disabled();
64 }
65}
66
67
68struct halt_info {
69 int mode;
70 char *restart_cmd;
71};
72
73static void
74common_shutdown_1(void *generic_ptr)
75{
76 struct halt_info *how = (struct halt_info *)generic_ptr;
77 struct percpu_struct *cpup;
78 unsigned long *pflags, flags;
79 int cpuid = smp_processor_id();
80
81
82 local_irq_disable();
83
84 cpup = (struct percpu_struct *)
85 ((unsigned long)hwrpb + hwrpb->processor_offset
86 + hwrpb->processor_size * cpuid);
87 pflags = &cpup->flags;
88 flags = *pflags;
89
90
91 flags &= ~0x00ff0001UL;
92
93#ifdef CONFIG_SMP
94
95 if (cpuid != boot_cpuid) {
96 flags |= 0x00040000UL;
97 *pflags = flags;
98 set_cpu_present(cpuid, false);
99 set_cpu_possible(cpuid, false);
100 halt();
101 }
102#endif
103
104 if (how->mode == LINUX_REBOOT_CMD_RESTART) {
105 if (!how->restart_cmd) {
106 flags |= 0x00020000UL;
107 } else {
108
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115
116 flags |= 0x00030000UL;
117 }
118 } else {
119 flags |= 0x00040000UL;
120 }
121 *pflags = flags;
122
123#ifdef CONFIG_SMP
124
125 set_cpu_present(boot_cpuid, false);
126 set_cpu_possible(boot_cpuid, false);
127 while (cpumask_weight(cpu_present_mask))
128 barrier();
129#endif
130
131
132 if (alpha_using_srm) {
133#ifdef CONFIG_DUMMY_CONSOLE
134
135
136 if (in_interrupt())
137 irq_exit();
138
139 take_over_console(&dummy_con, 0, MAX_NR_CONSOLES-1, 1);
140#endif
141 pci_restore_srm_config();
142 set_hae(srm_hae);
143 }
144
145 if (alpha_mv.kill_arch)
146 alpha_mv.kill_arch(how->mode);
147
148 if (! alpha_using_srm && how->mode != LINUX_REBOOT_CMD_RESTART) {
149
150
151
152 return;
153 }
154
155 if (alpha_using_srm)
156 srm_paging_stop();
157
158 halt();
159}
160
161static void
162common_shutdown(int mode, char *restart_cmd)
163{
164 struct halt_info args;
165 args.mode = mode;
166 args.restart_cmd = restart_cmd;
167 on_each_cpu(common_shutdown_1, &args, 0);
168}
169
170void
171machine_restart(char *restart_cmd)
172{
173 common_shutdown(LINUX_REBOOT_CMD_RESTART, restart_cmd);
174}
175
176
177void
178machine_halt(void)
179{
180 common_shutdown(LINUX_REBOOT_CMD_HALT, NULL);
181}
182
183
184void
185machine_power_off(void)
186{
187 common_shutdown(LINUX_REBOOT_CMD_POWER_OFF, NULL);
188}
189
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192
193
194void
195show_regs(struct pt_regs *regs)
196{
197 dik_show_regs(regs, NULL);
198}
199
200
201
202
203void
204start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
205{
206 regs->pc = pc;
207 regs->ps = 8;
208 wrusp(sp);
209}
210EXPORT_SYMBOL(start_thread);
211
212
213
214
215void
216exit_thread(void)
217{
218}
219
220void
221flush_thread(void)
222{
223
224
225 current_thread_info()->ieee_state = 0;
226 wrfpcr(FPCR_DYN_NORMAL | ieee_swcr_to_fpcr(0));
227
228
229 current_thread_info()->pcb.unique = 0;
230}
231
232void
233release_thread(struct task_struct *dead_task)
234{
235}
236
237
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239
240
241int
242copy_thread(unsigned long clone_flags, unsigned long usp,
243 unsigned long arg,
244 struct task_struct *p)
245{
246 extern void ret_from_fork(void);
247 extern void ret_from_kernel_thread(void);
248
249 struct thread_info *childti = task_thread_info(p);
250 struct pt_regs *childregs = task_pt_regs(p);
251 struct pt_regs *regs = current_pt_regs();
252 struct switch_stack *childstack, *stack;
253 unsigned long settls;
254
255 childstack = ((struct switch_stack *) childregs) - 1;
256 childti->pcb.ksp = (unsigned long) childstack;
257 childti->pcb.flags = 1;
258
259 if (unlikely(p->flags & PF_KTHREAD)) {
260
261 memset(childstack, 0,
262 sizeof(struct switch_stack) + sizeof(struct pt_regs));
263 childstack->r26 = (unsigned long) ret_from_kernel_thread;
264 childstack->r9 = usp;
265 childstack->r10 = arg;
266 childregs->hae = alpha_mv.hae_cache,
267 childti->pcb.usp = 0;
268 return 0;
269 }
270
271
272
273
274
275 if (clone_flags & CLONE_SETTLS)
276 childti->pcb.unique = regs->r20;
277 childti->pcb.usp = usp ?: rdusp();
278 *childregs = *regs;
279 childregs->r0 = 0;
280 childregs->r19 = 0;
281 childregs->r20 = 1;
282 regs->r20 = 0;
283 stack = ((struct switch_stack *) regs) - 1;
284 *childstack = *stack;
285 childstack->r26 = (unsigned long) ret_from_fork;
286 return 0;
287}
288
289
290
291
292void
293dump_elf_thread(elf_greg_t *dest, struct pt_regs *pt, struct thread_info *ti)
294{
295
296 struct switch_stack * sw = ((struct switch_stack *) pt) - 1;
297
298 dest[ 0] = pt->r0;
299 dest[ 1] = pt->r1;
300 dest[ 2] = pt->r2;
301 dest[ 3] = pt->r3;
302 dest[ 4] = pt->r4;
303 dest[ 5] = pt->r5;
304 dest[ 6] = pt->r6;
305 dest[ 7] = pt->r7;
306 dest[ 8] = pt->r8;
307 dest[ 9] = sw->r9;
308 dest[10] = sw->r10;
309 dest[11] = sw->r11;
310 dest[12] = sw->r12;
311 dest[13] = sw->r13;
312 dest[14] = sw->r14;
313 dest[15] = sw->r15;
314 dest[16] = pt->r16;
315 dest[17] = pt->r17;
316 dest[18] = pt->r18;
317 dest[19] = pt->r19;
318 dest[20] = pt->r20;
319 dest[21] = pt->r21;
320 dest[22] = pt->r22;
321 dest[23] = pt->r23;
322 dest[24] = pt->r24;
323 dest[25] = pt->r25;
324 dest[26] = pt->r26;
325 dest[27] = pt->r27;
326 dest[28] = pt->r28;
327 dest[29] = pt->gp;
328 dest[30] = ti == current_thread_info() ? rdusp() : ti->pcb.usp;
329 dest[31] = pt->pc;
330
331
332
333
334 dest[32] = ti->pcb.unique;
335}
336EXPORT_SYMBOL(dump_elf_thread);
337
338int
339dump_elf_task(elf_greg_t *dest, struct task_struct *task)
340{
341 dump_elf_thread(dest, task_pt_regs(task), task_thread_info(task));
342 return 1;
343}
344EXPORT_SYMBOL(dump_elf_task);
345
346int
347dump_elf_task_fp(elf_fpreg_t *dest, struct task_struct *task)
348{
349 struct switch_stack *sw = (struct switch_stack *)task_pt_regs(task) - 1;
350 memcpy(dest, sw->fp, 32 * 8);
351 return 1;
352}
353EXPORT_SYMBOL(dump_elf_task_fp);
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369unsigned long
370thread_saved_pc(struct task_struct *t)
371{
372 unsigned long base = (unsigned long)task_stack_page(t);
373 unsigned long fp, sp = task_thread_info(t)->pcb.ksp;
374
375 if (sp > base && sp+6*8 < base + 16*1024) {
376 fp = ((unsigned long*)sp)[6];
377 if (fp > sp && fp < base + 16*1024)
378 return *(unsigned long *)fp;
379 }
380
381 return 0;
382}
383
384unsigned long
385get_wchan(struct task_struct *p)
386{
387 unsigned long schedule_frame;
388 unsigned long pc;
389 if (!p || p == current || p->state == TASK_RUNNING)
390 return 0;
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401 pc = thread_saved_pc(p);
402 if (in_sched_functions(pc)) {
403 schedule_frame = ((unsigned long *)task_thread_info(p)->pcb.ksp)[6];
404 return ((unsigned long *)schedule_frame)[12];
405 }
406 return pc;
407}
408