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1 | /* | |
2 | * PARISC Architecture-dependent parts of process handling | |
3 | * based on the work for i386 | |
4 | * | |
5 | * Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org> | |
6 | * Copyright (C) 2000 Martin K Petersen <mkp at mkp.net> | |
7 | * Copyright (C) 2000 John Marvin <jsm at parisc-linux.org> | |
8 | * Copyright (C) 2000 David Huggins-Daines <dhd with pobox.org> | |
9 | * Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org> | |
10 | * Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org> | |
11 | * Copyright (C) 2000 David Kennedy <dkennedy with linuxcare.com> | |
12 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> | |
13 | * Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org> | |
14 | * Copyright (C) 2001 Alan Modra <amodra at parisc-linux.org> | |
15 | * Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org> | |
16 | * Copyright (C) 2001-2007 Helge Deller <deller at parisc-linux.org> | |
17 | * Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org> | |
18 | * | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
33 | */ | |
34 | ||
35 | #include <stdarg.h> | |
36 | ||
37 | #include <linux/elf.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/mm.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/module.h> | |
43 | #include <linux/personality.h> | |
44 | #include <linux/ptrace.h> | |
45 | #include <linux/sched.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/stddef.h> | |
48 | #include <linux/unistd.h> | |
49 | #include <linux/kallsyms.h> | |
50 | #include <linux/uaccess.h> | |
51 | #include <linux/rcupdate.h> | |
52 | ||
53 | #include <asm/io.h> | |
54 | #include <asm/asm-offsets.h> | |
55 | #include <asm/assembly.h> | |
56 | #include <asm/pdc.h> | |
57 | #include <asm/pdc_chassis.h> | |
58 | #include <asm/pgalloc.h> | |
59 | #include <asm/unwind.h> | |
60 | #include <asm/sections.h> | |
61 | ||
62 | /* | |
63 | * The idle thread. There's no useful work to be | |
64 | * done, so just try to conserve power and have a | |
65 | * low exit latency (ie sit in a loop waiting for | |
66 | * somebody to say that they'd like to reschedule) | |
67 | */ | |
68 | void cpu_idle(void) | |
69 | { | |
70 | set_thread_flag(TIF_POLLING_NRFLAG); | |
71 | ||
72 | /* endless idle loop with no priority at all */ | |
73 | while (1) { | |
74 | rcu_idle_enter(); | |
75 | while (!need_resched()) | |
76 | barrier(); | |
77 | rcu_idle_exit(); | |
78 | schedule_preempt_disabled(); | |
79 | check_pgt_cache(); | |
80 | } | |
81 | } | |
82 | ||
83 | ||
84 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) | |
85 | #define CMD_RESET 5 /* reset any module */ | |
86 | ||
87 | /* | |
88 | ** The Wright Brothers and Gecko systems have a H/W problem | |
89 | ** (Lasi...'nuf said) may cause a broadcast reset to lockup | |
90 | ** the system. An HVERSION dependent PDC call was developed | |
91 | ** to perform a "safe", platform specific broadcast reset instead | |
92 | ** of kludging up all the code. | |
93 | ** | |
94 | ** Older machines which do not implement PDC_BROADCAST_RESET will | |
95 | ** return (with an error) and the regular broadcast reset can be | |
96 | ** issued. Obviously, if the PDC does implement PDC_BROADCAST_RESET | |
97 | ** the PDC call will not return (the system will be reset). | |
98 | */ | |
99 | void machine_restart(char *cmd) | |
100 | { | |
101 | #ifdef FASTBOOT_SELFTEST_SUPPORT | |
102 | /* | |
103 | ** If user has modified the Firmware Selftest Bitmap, | |
104 | ** run the tests specified in the bitmap after the | |
105 | ** system is rebooted w/PDC_DO_RESET. | |
106 | ** | |
107 | ** ftc_bitmap = 0x1AUL "Skip destructive memory tests" | |
108 | ** | |
109 | ** Using "directed resets" at each processor with the MEM_TOC | |
110 | ** vector cleared will also avoid running destructive | |
111 | ** memory self tests. (Not implemented yet) | |
112 | */ | |
113 | if (ftc_bitmap) { | |
114 | pdc_do_firm_test_reset(ftc_bitmap); | |
115 | } | |
116 | #endif | |
117 | /* set up a new led state on systems shipped with a LED State panel */ | |
118 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
119 | ||
120 | /* "Normal" system reset */ | |
121 | pdc_do_reset(); | |
122 | ||
123 | /* Nope...box should reset with just CMD_RESET now */ | |
124 | gsc_writel(CMD_RESET, COMMAND_GLOBAL); | |
125 | ||
126 | /* Wait for RESET to lay us to rest. */ | |
127 | while (1) ; | |
128 | ||
129 | } | |
130 | ||
131 | void machine_halt(void) | |
132 | { | |
133 | /* | |
134 | ** The LED/ChassisCodes are updated by the led_halt() | |
135 | ** function, called by the reboot notifier chain. | |
136 | */ | |
137 | } | |
138 | ||
139 | void (*chassis_power_off)(void); | |
140 | ||
141 | /* | |
142 | * This routine is called from sys_reboot to actually turn off the | |
143 | * machine | |
144 | */ | |
145 | void machine_power_off(void) | |
146 | { | |
147 | /* If there is a registered power off handler, call it. */ | |
148 | if (chassis_power_off) | |
149 | chassis_power_off(); | |
150 | ||
151 | /* Put the soft power button back under hardware control. | |
152 | * If the user had already pressed the power button, the | |
153 | * following call will immediately power off. */ | |
154 | pdc_soft_power_button(0); | |
155 | ||
156 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_SHUTDOWN); | |
157 | ||
158 | /* It seems we have no way to power the system off via | |
159 | * software. The user has to press the button himself. */ | |
160 | ||
161 | printk(KERN_EMERG "System shut down completed.\n" | |
162 | "Please power this system off now."); | |
163 | } | |
164 | ||
165 | void (*pm_power_off)(void) = machine_power_off; | |
166 | EXPORT_SYMBOL(pm_power_off); | |
167 | ||
168 | /* | |
169 | * Free current thread data structures etc.. | |
170 | */ | |
171 | void exit_thread(void) | |
172 | { | |
173 | } | |
174 | ||
175 | void flush_thread(void) | |
176 | { | |
177 | /* Only needs to handle fpu stuff or perf monitors. | |
178 | ** REVISIT: several arches implement a "lazy fpu state". | |
179 | */ | |
180 | } | |
181 | ||
182 | void release_thread(struct task_struct *dead_task) | |
183 | { | |
184 | } | |
185 | ||
186 | /* | |
187 | * Fill in the FPU structure for a core dump. | |
188 | */ | |
189 | ||
190 | int dump_fpu (struct pt_regs * regs, elf_fpregset_t *r) | |
191 | { | |
192 | if (regs == NULL) | |
193 | return 0; | |
194 | ||
195 | memcpy(r, regs->fr, sizeof *r); | |
196 | return 1; | |
197 | } | |
198 | ||
199 | int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r) | |
200 | { | |
201 | memcpy(r, tsk->thread.regs.fr, sizeof(*r)); | |
202 | return 1; | |
203 | } | |
204 | ||
205 | int | |
206 | copy_thread(unsigned long clone_flags, unsigned long usp, | |
207 | unsigned long arg, struct task_struct *p) | |
208 | { | |
209 | struct pt_regs *cregs = &(p->thread.regs); | |
210 | void *stack = task_stack_page(p); | |
211 | ||
212 | /* We have to use void * instead of a function pointer, because | |
213 | * function pointers aren't a pointer to the function on 64-bit. | |
214 | * Make them const so the compiler knows they live in .text */ | |
215 | extern void * const ret_from_kernel_thread; | |
216 | extern void * const child_return; | |
217 | #ifdef CONFIG_HPUX | |
218 | extern void * const hpux_child_return; | |
219 | #endif | |
220 | if (unlikely(p->flags & PF_KTHREAD)) { | |
221 | memset(cregs, 0, sizeof(struct pt_regs)); | |
222 | if (!usp) /* idle thread */ | |
223 | return 0; | |
224 | ||
225 | /* kernel thread */ | |
226 | /* Must exit via ret_from_kernel_thread in order | |
227 | * to call schedule_tail() | |
228 | */ | |
229 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; | |
230 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; | |
231 | /* | |
232 | * Copy function and argument to be called from | |
233 | * ret_from_kernel_thread. | |
234 | */ | |
235 | #ifdef CONFIG_64BIT | |
236 | cregs->gr[27] = ((unsigned long *)usp)[3]; | |
237 | cregs->gr[26] = ((unsigned long *)usp)[2]; | |
238 | #else | |
239 | cregs->gr[26] = usp; | |
240 | #endif | |
241 | cregs->gr[25] = arg; | |
242 | } else { | |
243 | /* user thread */ | |
244 | /* usp must be word aligned. This also prevents users from | |
245 | * passing in the value 1 (which is the signal for a special | |
246 | * return for a kernel thread) */ | |
247 | if (usp) { | |
248 | usp = ALIGN(usp, 4); | |
249 | if (likely(usp)) | |
250 | cregs->gr[30] = usp; | |
251 | } | |
252 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; | |
253 | if (personality(p->personality) == PER_HPUX) { | |
254 | #ifdef CONFIG_HPUX | |
255 | cregs->kpc = (unsigned long) &hpux_child_return; | |
256 | #else | |
257 | BUG(); | |
258 | #endif | |
259 | } else { | |
260 | cregs->kpc = (unsigned long) &child_return; | |
261 | } | |
262 | /* Setup thread TLS area from the 4th parameter in clone */ | |
263 | if (clone_flags & CLONE_SETTLS) | |
264 | cregs->cr27 = cregs->gr[23]; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | unsigned long thread_saved_pc(struct task_struct *t) | |
271 | { | |
272 | return t->thread.regs.kpc; | |
273 | } | |
274 | ||
275 | unsigned long | |
276 | get_wchan(struct task_struct *p) | |
277 | { | |
278 | struct unwind_frame_info info; | |
279 | unsigned long ip; | |
280 | int count = 0; | |
281 | ||
282 | if (!p || p == current || p->state == TASK_RUNNING) | |
283 | return 0; | |
284 | ||
285 | /* | |
286 | * These bracket the sleeping functions.. | |
287 | */ | |
288 | ||
289 | unwind_frame_init_from_blocked_task(&info, p); | |
290 | do { | |
291 | if (unwind_once(&info) < 0) | |
292 | return 0; | |
293 | ip = info.ip; | |
294 | if (!in_sched_functions(ip)) | |
295 | return ip; | |
296 | } while (count++ < 16); | |
297 | return 0; | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_64BIT | |
301 | void *dereference_function_descriptor(void *ptr) | |
302 | { | |
303 | Elf64_Fdesc *desc = ptr; | |
304 | void *p; | |
305 | ||
306 | if (!probe_kernel_address(&desc->addr, p)) | |
307 | ptr = p; | |
308 | return ptr; | |
309 | } | |
310 | #endif |