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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
49struct halt_info {
50 int mode;
51 char *restart_cmd;
52};
53
54static void
55common_shutdown_1(void *generic_ptr)
56{
57 struct halt_info *how = (struct halt_info *)generic_ptr;
58 struct percpu_struct *cpup;
59 unsigned long *pflags, flags;
60 int cpuid = smp_processor_id();
61
62
63 local_irq_disable();
64
65 cpup = (struct percpu_struct *)
66 ((unsigned long)hwrpb + hwrpb->processor_offset
67 + hwrpb->processor_size * cpuid);
68 pflags = &cpup->flags;
69 flags = *pflags;
70
71
72 flags &= ~0x00ff0001UL;
73
74#ifdef CONFIG_SMP
75
76 if (cpuid != boot_cpuid) {
77 flags |= 0x00040000UL;
78 *pflags = flags;
79 set_cpu_present(cpuid, false);
80 set_cpu_possible(cpuid, false);
81 halt();
82 }
83#endif
84
85 if (how->mode == LINUX_REBOOT_CMD_RESTART) {
86 if (!how->restart_cmd) {
87 flags |= 0x00020000UL;
88 } else {
89
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97 flags |= 0x00030000UL;
98 }
99 } else {
100 flags |= 0x00040000UL;
101 }
102 *pflags = flags;
103
104#ifdef CONFIG_SMP
105
106 set_cpu_present(boot_cpuid, false);
107 set_cpu_possible(boot_cpuid, false);
108 while (cpumask_weight(cpu_present_mask))
109 barrier();
110#endif
111
112
113 if (alpha_using_srm) {
114#ifdef CONFIG_DUMMY_CONSOLE
115
116
117 if (in_interrupt())
118 irq_exit();
119
120 console_lock();
121 do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES-1, 1);
122 console_unlock();
123#endif
124 pci_restore_srm_config();
125 set_hae(srm_hae);
126 }
127
128 if (alpha_mv.kill_arch)
129 alpha_mv.kill_arch(how->mode);
130
131 if (! alpha_using_srm && how->mode != LINUX_REBOOT_CMD_RESTART) {
132
133
134
135 return;
136 }
137
138 if (alpha_using_srm)
139 srm_paging_stop();
140
141 halt();
142}
143
144static void
145common_shutdown(int mode, char *restart_cmd)
146{
147 struct halt_info args;
148 args.mode = mode;
149 args.restart_cmd = restart_cmd;
150 on_each_cpu(common_shutdown_1, &args, 0);
151}
152
153void
154machine_restart(char *restart_cmd)
155{
156 common_shutdown(LINUX_REBOOT_CMD_RESTART, restart_cmd);
157}
158
159
160void
161machine_halt(void)
162{
163 common_shutdown(LINUX_REBOOT_CMD_HALT, NULL);
164}
165
166
167void
168machine_power_off(void)
169{
170 common_shutdown(LINUX_REBOOT_CMD_POWER_OFF, NULL);
171}
172
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175
176
177void
178show_regs(struct pt_regs *regs)
179{
180 show_regs_print_info(KERN_DEFAULT);
181 dik_show_regs(regs, NULL);
182}
183
184
185
186
187void
188start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
189{
190 regs->pc = pc;
191 regs->ps = 8;
192 wrusp(sp);
193}
194EXPORT_SYMBOL(start_thread);
195
196
197
198
199void
200exit_thread(void)
201{
202}
203
204void
205flush_thread(void)
206{
207
208
209 current_thread_info()->ieee_state = 0;
210 wrfpcr(FPCR_DYN_NORMAL | ieee_swcr_to_fpcr(0));
211
212
213 current_thread_info()->pcb.unique = 0;
214}
215
216void
217release_thread(struct task_struct *dead_task)
218{
219}
220
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223
224
225int
226copy_thread(unsigned long clone_flags, unsigned long usp,
227 unsigned long arg,
228 struct task_struct *p)
229{
230 extern void ret_from_fork(void);
231 extern void ret_from_kernel_thread(void);
232
233 struct thread_info *childti = task_thread_info(p);
234 struct pt_regs *childregs = task_pt_regs(p);
235 struct pt_regs *regs = current_pt_regs();
236 struct switch_stack *childstack, *stack;
237
238 childstack = ((struct switch_stack *) childregs) - 1;
239 childti->pcb.ksp = (unsigned long) childstack;
240 childti->pcb.flags = 1;
241
242 if (unlikely(p->flags & PF_KTHREAD)) {
243
244 memset(childstack, 0,
245 sizeof(struct switch_stack) + sizeof(struct pt_regs));
246 childstack->r26 = (unsigned long) ret_from_kernel_thread;
247 childstack->r9 = usp;
248 childstack->r10 = arg;
249 childregs->hae = alpha_mv.hae_cache,
250 childti->pcb.usp = 0;
251 return 0;
252 }
253
254
255
256
257
258 if (clone_flags & CLONE_SETTLS)
259 childti->pcb.unique = regs->r20;
260 childti->pcb.usp = usp ?: rdusp();
261 *childregs = *regs;
262 childregs->r0 = 0;
263 childregs->r19 = 0;
264 childregs->r20 = 1;
265 regs->r20 = 0;
266 stack = ((struct switch_stack *) regs) - 1;
267 *childstack = *stack;
268 childstack->r26 = (unsigned long) ret_from_fork;
269 return 0;
270}
271
272
273
274
275void
276dump_elf_thread(elf_greg_t *dest, struct pt_regs *pt, struct thread_info *ti)
277{
278
279 struct switch_stack * sw = ((struct switch_stack *) pt) - 1;
280
281 dest[ 0] = pt->r0;
282 dest[ 1] = pt->r1;
283 dest[ 2] = pt->r2;
284 dest[ 3] = pt->r3;
285 dest[ 4] = pt->r4;
286 dest[ 5] = pt->r5;
287 dest[ 6] = pt->r6;
288 dest[ 7] = pt->r7;
289 dest[ 8] = pt->r8;
290 dest[ 9] = sw->r9;
291 dest[10] = sw->r10;
292 dest[11] = sw->r11;
293 dest[12] = sw->r12;
294 dest[13] = sw->r13;
295 dest[14] = sw->r14;
296 dest[15] = sw->r15;
297 dest[16] = pt->r16;
298 dest[17] = pt->r17;
299 dest[18] = pt->r18;
300 dest[19] = pt->r19;
301 dest[20] = pt->r20;
302 dest[21] = pt->r21;
303 dest[22] = pt->r22;
304 dest[23] = pt->r23;
305 dest[24] = pt->r24;
306 dest[25] = pt->r25;
307 dest[26] = pt->r26;
308 dest[27] = pt->r27;
309 dest[28] = pt->r28;
310 dest[29] = pt->gp;
311 dest[30] = ti == current_thread_info() ? rdusp() : ti->pcb.usp;
312 dest[31] = pt->pc;
313
314
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316
317 dest[32] = ti->pcb.unique;
318}
319EXPORT_SYMBOL(dump_elf_thread);
320
321int
322dump_elf_task(elf_greg_t *dest, struct task_struct *task)
323{
324 dump_elf_thread(dest, task_pt_regs(task), task_thread_info(task));
325 return 1;
326}
327EXPORT_SYMBOL(dump_elf_task);
328
329int
330dump_elf_task_fp(elf_fpreg_t *dest, struct task_struct *task)
331{
332 struct switch_stack *sw = (struct switch_stack *)task_pt_regs(task) - 1;
333 memcpy(dest, sw->fp, 32 * 8);
334 return 1;
335}
336EXPORT_SYMBOL(dump_elf_task_fp);
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352unsigned long
353thread_saved_pc(struct task_struct *t)
354{
355 unsigned long base = (unsigned long)task_stack_page(t);
356 unsigned long fp, sp = task_thread_info(t)->pcb.ksp;
357
358 if (sp > base && sp+6*8 < base + 16*1024) {
359 fp = ((unsigned long*)sp)[6];
360 if (fp > sp && fp < base + 16*1024)
361 return *(unsigned long *)fp;
362 }
363
364 return 0;
365}
366
367unsigned long
368get_wchan(struct task_struct *p)
369{
370 unsigned long schedule_frame;
371 unsigned long pc;
372 if (!p || p == current || p->state == TASK_RUNNING)
373 return 0;
374
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384 pc = thread_saved_pc(p);
385 if (in_sched_functions(pc)) {
386 schedule_frame = ((unsigned long *)task_thread_info(p)->pcb.ksp)[6];
387 return ((unsigned long *)schedule_frame)[12];
388 }
389 return pc;
390}
391