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1da177e4 LT |
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> | |
b2450cc1 | 12 | * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> |
1da177e4 LT |
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> | |
a8f44e38 | 16 | * Copyright (C) 2001-2007 Helge Deller <deller at parisc-linux.org> |
1da177e4 LT |
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> | |
4e950f6f | 41 | #include <linux/fs.h> |
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/personality.h> | |
44 | #include <linux/ptrace.h> | |
45 | #include <linux/sched.h> | |
5a0e3ad6 | 46 | #include <linux/slab.h> |
1da177e4 LT |
47 | #include <linux/stddef.h> |
48 | #include <linux/unistd.h> | |
49 | #include <linux/kallsyms.h> | |
b609308e | 50 | #include <linux/uaccess.h> |
fbe75218 | 51 | #include <linux/rcupdate.h> |
1da177e4 LT |
52 | |
53 | #include <asm/io.h> | |
0013a854 | 54 | #include <asm/asm-offsets.h> |
ff0ab8af | 55 | #include <asm/assembly.h> |
1da177e4 LT |
56 | #include <asm/pdc.h> |
57 | #include <asm/pdc_chassis.h> | |
58 | #include <asm/pgalloc.h> | |
1da177e4 | 59 | #include <asm/unwind.h> |
b609308e | 60 | #include <asm/sections.h> |
1da177e4 | 61 | |
1da177e4 LT |
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 | { | |
64c7c8f8 NP |
70 | set_thread_flag(TIF_POLLING_NRFLAG); |
71 | ||
1da177e4 LT |
72 | /* endless idle loop with no priority at all */ |
73 | while (1) { | |
fbe75218 | 74 | rcu_idle_enter(); |
1da177e4 LT |
75 | while (!need_resched()) |
76 | barrier(); | |
fbe75218 | 77 | rcu_idle_exit(); |
bd2f5536 | 78 | schedule_preempt_disabled(); |
1da177e4 LT |
79 | check_pgt_cache(); |
80 | } | |
81 | } | |
82 | ||
83 | ||
10992092 | 84 | #define COMMAND_GLOBAL F_EXTEND(0xfffe0030) |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
85509c00 | 139 | void (*chassis_power_off)(void); |
1da177e4 LT |
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. */ | |
85509c00 KM |
148 | if (chassis_power_off) |
149 | chassis_power_off(); | |
1da177e4 LT |
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" | |
ad361c98 | 162 | "Please power this system off now."); |
1da177e4 LT |
163 | } |
164 | ||
85509c00 KM |
165 | void (*pm_power_off)(void) = machine_power_off; |
166 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 167 | |
1da177e4 LT |
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 | */ | |
1da177e4 LT |
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 | ||
1da177e4 | 205 | int |
6f2c55b8 | 206 | copy_thread(unsigned long clone_flags, unsigned long usp, |
a44e060f | 207 | unsigned long arg, |
415bfae9 | 208 | struct task_struct *p, struct pt_regs *unused) |
1da177e4 LT |
209 | { |
210 | struct pt_regs * cregs = &(p->thread.regs); | |
40f1f0de | 211 | void *stack = task_stack_page(p); |
1da177e4 LT |
212 | |
213 | /* We have to use void * instead of a function pointer, because | |
214 | * function pointers aren't a pointer to the function on 64-bit. | |
215 | * Make them const so the compiler knows they live in .text */ | |
216 | extern void * const ret_from_kernel_thread; | |
217 | extern void * const child_return; | |
218 | #ifdef CONFIG_HPUX | |
219 | extern void * const hpux_child_return; | |
220 | #endif | |
ff0ab8af | 221 | if (unlikely(p->flags & PF_KTHREAD)) { |
a44e060f | 222 | memset(cregs, 0, sizeof(struct pt_regs)); |
ff0ab8af AV |
223 | if (!usp) /* idle thread */ |
224 | return 0; | |
225 | ||
1da177e4 | 226 | /* kernel thread */ |
1da177e4 LT |
227 | /* Must exit via ret_from_kernel_thread in order |
228 | * to call schedule_tail() | |
229 | */ | |
ff0ab8af | 230 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
1da177e4 LT |
231 | cregs->kpc = (unsigned long) &ret_from_kernel_thread; |
232 | /* | |
233 | * Copy function and argument to be called from | |
234 | * ret_from_kernel_thread. | |
235 | */ | |
a8f44e38 | 236 | #ifdef CONFIG_64BIT |
a44e060f AV |
237 | cregs->gr[27] = ((unsigned long *)usp)[3]; |
238 | cregs->gr[26] = ((unsigned long *)usp)[2]; | |
239 | #else | |
240 | cregs->gr[26] = usp; | |
1da177e4 | 241 | #endif |
a44e060f | 242 | cregs->gr[25] = arg; |
1da177e4 LT |
243 | } else { |
244 | /* user thread */ | |
415bfae9 AV |
245 | /* usp must be word aligned. This also prevents users from |
246 | * passing in the value 1 (which is the signal for a special | |
247 | * return for a kernel thread) */ | |
248 | if (usp) { | |
249 | usp = ALIGN(usp, 4); | |
250 | if (likely(usp)) | |
251 | cregs->gr[30] = usp; | |
252 | } | |
ff0ab8af | 253 | cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE; |
5b24c421 | 254 | if (personality(p->personality) == PER_HPUX) { |
1da177e4 LT |
255 | #ifdef CONFIG_HPUX |
256 | cregs->kpc = (unsigned long) &hpux_child_return; | |
257 | #else | |
258 | BUG(); | |
259 | #endif | |
260 | } else { | |
261 | cregs->kpc = (unsigned long) &child_return; | |
262 | } | |
b2450cc1 CD |
263 | /* Setup thread TLS area from the 4th parameter in clone */ |
264 | if (clone_flags & CLONE_SETTLS) | |
415bfae9 | 265 | cregs->cr27 = cregs->gr[23]; |
1da177e4 LT |
266 | } |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | unsigned long thread_saved_pc(struct task_struct *t) | |
272 | { | |
273 | return t->thread.regs.kpc; | |
274 | } | |
275 | ||
3db03b4a | 276 | unsigned long |
1da177e4 LT |
277 | get_wchan(struct task_struct *p) |
278 | { | |
279 | struct unwind_frame_info info; | |
280 | unsigned long ip; | |
281 | int count = 0; | |
cc650a7a KM |
282 | |
283 | if (!p || p == current || p->state == TASK_RUNNING) | |
284 | return 0; | |
285 | ||
1da177e4 LT |
286 | /* |
287 | * These bracket the sleeping functions.. | |
288 | */ | |
289 | ||
290 | unwind_frame_init_from_blocked_task(&info, p); | |
291 | do { | |
292 | if (unwind_once(&info) < 0) | |
293 | return 0; | |
294 | ip = info.ip; | |
295 | if (!in_sched_functions(ip)) | |
296 | return ip; | |
297 | } while (count++ < 16); | |
298 | return 0; | |
299 | } | |
b609308e KM |
300 | |
301 | #ifdef CONFIG_64BIT | |
302 | void *dereference_function_descriptor(void *ptr) | |
303 | { | |
304 | Elf64_Fdesc *desc = ptr; | |
305 | void *p; | |
306 | ||
307 | if (!probe_kernel_address(&desc->addr, p)) | |
308 | ptr = p; | |
309 | return ptr; | |
310 | } | |
311 | #endif |