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5d01e6ce | 1 | /* $Id: process.c,v 1.21 2005/03/04 08:16:17 starvik Exp $ |
1da177e4 LT |
2 | * |
3 | * linux/arch/cris/kernel/process.c | |
4 | * | |
5 | * Copyright (C) 1995 Linus Torvalds | |
6 | * Copyright (C) 2000-2002 Axis Communications AB | |
7 | * | |
8 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
9 | * | |
10 | * $Log: process.c,v $ | |
5d01e6ce MS |
11 | * Revision 1.21 2005/03/04 08:16:17 starvik |
12 | * Merge of Linux 2.6.11. | |
13 | * | |
14 | * Revision 1.20 2005/01/18 05:57:22 starvik | |
15 | * Renamed hlt_counter to cris_hlt_counter and made it global. | |
16 | * | |
17 | * Revision 1.19 2004/10/19 13:07:43 starvik | |
18 | * Merge of Linux 2.6.9 | |
19 | * | |
20 | * Revision 1.18 2004/08/16 12:37:23 starvik | |
21 | * Merge of Linux 2.6.8 | |
22 | * | |
1da177e4 LT |
23 | * Revision 1.17 2004/04/05 13:53:48 starvik |
24 | * Merge of Linux 2.6.5 | |
25 | * | |
26 | * Revision 1.16 2003/10/27 08:04:33 starvik | |
27 | * Merge of Linux 2.6.0-test9 | |
28 | * | |
29 | * Revision 1.15 2003/09/11 07:29:52 starvik | |
30 | * Merge of Linux 2.6.0-test5 | |
31 | * | |
32 | * Revision 1.14 2003/06/10 10:21:12 johana | |
33 | * Moved thread_saved_pc() from arch/cris/kernel/process.c to | |
34 | * subarch specific process.c. arch-v32 has an erp, no irp. | |
35 | * | |
36 | * Revision 1.13 2003/04/09 05:20:47 starvik | |
37 | * Merge of Linux 2.5.67 | |
38 | * | |
39 | * Revision 1.12 2002/12/11 15:41:11 starvik | |
40 | * Extracted v10 (ETRAX 100LX) specific stuff to arch/cris/arch-v10/kernel | |
41 | * | |
42 | * Revision 1.11 2002/12/10 09:00:10 starvik | |
43 | * Merge of Linux 2.5.51 | |
44 | * | |
45 | * Revision 1.10 2002/11/27 08:42:34 starvik | |
46 | * Argument to user_regs() is thread_info* | |
47 | * | |
48 | * Revision 1.9 2002/11/26 09:44:21 starvik | |
49 | * New threads exits through ret_from_fork (necessary for preemptive scheduling) | |
50 | * | |
51 | * Revision 1.8 2002/11/19 14:35:24 starvik | |
52 | * Changes from linux 2.4 | |
53 | * Changed struct initializer syntax to the currently prefered notation | |
54 | * | |
55 | * Revision 1.7 2002/11/18 07:39:42 starvik | |
56 | * thread_saved_pc moved here from processor.h | |
57 | * | |
58 | * Revision 1.6 2002/11/14 06:51:27 starvik | |
59 | * Made cpu_idle more similar with other archs | |
60 | * init_task_union -> init_thread_union | |
61 | * Updated for new interrupt macros | |
62 | * sys_clone and do_fork have a new argument, user_tid | |
63 | * | |
64 | * Revision 1.5 2002/11/05 06:45:11 starvik | |
65 | * Merge of Linux 2.5.45 | |
66 | * | |
67 | * Revision 1.4 2002/02/05 15:37:44 bjornw | |
68 | * Need init_task.h | |
69 | * | |
70 | * Revision 1.3 2002/01/21 15:22:49 bjornw | |
71 | * current->counter is gone | |
72 | * | |
73 | * Revision 1.22 2001/11/13 09:40:43 orjanf | |
74 | * Added dump_fpu (needed for core dumps). | |
75 | * | |
76 | * Revision 1.21 2001/11/12 18:26:21 pkj | |
77 | * Fixed compiler warnings. | |
78 | * | |
79 | * Revision 1.20 2001/10/03 08:21:39 jonashg | |
80 | * cause_of_death does not exist if CONFIG_SVINTO_SIM is defined. | |
81 | * | |
82 | * Revision 1.19 2001/09/26 11:52:54 bjornw | |
83 | * INIT_MMAP is gone in 2.4.10 | |
84 | * | |
85 | * Revision 1.18 2001/08/21 21:43:51 hp | |
86 | * Move last watchdog fix inside #ifdef CONFIG_ETRAX_WATCHDOG | |
87 | * | |
88 | * Revision 1.17 2001/08/21 13:48:01 jonashg | |
89 | * Added fix by HP to avoid oops when doing a hard_reset_now. | |
90 | * | |
91 | * Revision 1.16 2001/06/21 02:00:40 hp | |
92 | * * entry.S: Include asm/unistd.h. | |
93 | * (_sys_call_table): Use section .rodata, not .data. | |
94 | * (_kernel_thread): Move from... | |
95 | * * process.c: ... here. | |
96 | * * entryoffsets.c (VAL): Break out from... | |
97 | * (OF): Use VAL. | |
98 | * (LCLONE_VM): New asmified value from CLONE_VM. | |
99 | * | |
100 | * Revision 1.15 2001/06/20 16:31:57 hp | |
101 | * Add comments to describe empty functions according to review. | |
102 | * | |
103 | * Revision 1.14 2001/05/29 11:27:59 markusl | |
104 | * Fixed so that hard_reset_now will do reset even if watchdog wasn't enabled | |
105 | * | |
106 | * Revision 1.13 2001/03/20 19:44:06 bjornw | |
107 | * Use the 7th syscall argument for regs instead of current_regs | |
108 | * | |
109 | */ | |
110 | ||
111 | /* | |
112 | * This file handles the architecture-dependent parts of process handling.. | |
113 | */ | |
114 | ||
115 | #include <asm/atomic.h> | |
116 | #include <asm/pgtable.h> | |
117 | #include <asm/uaccess.h> | |
118 | #include <asm/irq.h> | |
119 | #include <linux/module.h> | |
120 | #include <linux/spinlock.h> | |
121 | #include <linux/fs_struct.h> | |
122 | #include <linux/init_task.h> | |
123 | #include <linux/sched.h> | |
124 | #include <linux/fs.h> | |
125 | #include <linux/user.h> | |
126 | #include <linux/elfcore.h> | |
127 | #include <linux/mqueue.h> | |
16dcb4bb | 128 | #include <linux/reboot.h> |
1da177e4 LT |
129 | |
130 | //#define DEBUG | |
131 | ||
132 | /* | |
133 | * Initial task structure. Make this a per-architecture thing, | |
134 | * because different architectures tend to have different | |
135 | * alignment requirements and potentially different initial | |
136 | * setup. | |
137 | */ | |
138 | ||
139 | static struct fs_struct init_fs = INIT_FS; | |
140 | static struct files_struct init_files = INIT_FILES; | |
141 | static struct signal_struct init_signals = INIT_SIGNALS(init_signals); | |
142 | static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); | |
143 | struct mm_struct init_mm = INIT_MM(init_mm); | |
144 | ||
145 | EXPORT_SYMBOL(init_mm); | |
146 | ||
147 | /* | |
148 | * Initial thread structure. | |
149 | * | |
150 | * We need to make sure that this is 8192-byte aligned due to the | |
151 | * way process stacks are handled. This is done by having a special | |
152 | * "init_task" linker map entry.. | |
153 | */ | |
154 | union thread_union init_thread_union | |
155 | __attribute__((__section__(".data.init_task"))) = | |
156 | { INIT_THREAD_INFO(init_task) }; | |
157 | ||
158 | /* | |
159 | * Initial task structure. | |
160 | * | |
161 | * All other task structs will be allocated on slabs in fork.c | |
162 | */ | |
163 | struct task_struct init_task = INIT_TASK(init_task); | |
164 | ||
165 | EXPORT_SYMBOL(init_task); | |
166 | ||
167 | /* | |
168 | * The hlt_counter, disable_hlt and enable_hlt is just here as a hook if | |
169 | * there would ever be a halt sequence (for power save when idle) with | |
170 | * some largish delay when halting or resuming *and* a driver that can't | |
171 | * afford that delay. The hlt_counter would then be checked before | |
172 | * executing the halt sequence, and the driver marks the unhaltable | |
173 | * region by enable_hlt/disable_hlt. | |
174 | */ | |
175 | ||
5d01e6ce | 176 | int cris_hlt_counter=0; |
1da177e4 LT |
177 | |
178 | void disable_hlt(void) | |
179 | { | |
5d01e6ce | 180 | cris_hlt_counter++; |
1da177e4 LT |
181 | } |
182 | ||
183 | EXPORT_SYMBOL(disable_hlt); | |
184 | ||
185 | void enable_hlt(void) | |
186 | { | |
5d01e6ce | 187 | cris_hlt_counter--; |
1da177e4 LT |
188 | } |
189 | ||
190 | EXPORT_SYMBOL(enable_hlt); | |
191 | ||
192 | /* | |
193 | * The following aren't currently used. | |
194 | */ | |
195 | void (*pm_idle)(void); | |
196 | ||
197 | extern void default_idle(void); | |
198 | ||
199 | /* | |
200 | * The idle thread. There's no useful work to be | |
201 | * done, so just try to conserve power and have a | |
202 | * low exit latency (ie sit in a loop waiting for | |
203 | * somebody to say that they'd like to reschedule) | |
204 | */ | |
205 | void cpu_idle (void) | |
206 | { | |
207 | /* endless idle loop with no priority at all */ | |
208 | while (1) { | |
209 | while (!need_resched()) { | |
5d01e6ce MS |
210 | void (*idle)(void); |
211 | /* | |
212 | * Mark this as an RCU critical section so that | |
213 | * synchronize_kernel() in the unload path waits | |
214 | * for our completion. | |
215 | */ | |
216 | idle = pm_idle; | |
1da177e4 LT |
217 | if (!idle) |
218 | idle = default_idle; | |
1da177e4 LT |
219 | idle(); |
220 | } | |
5bfb5d69 | 221 | preempt_enable_no_resched(); |
1da177e4 | 222 | schedule(); |
5bfb5d69 | 223 | preempt_disable(); |
1da177e4 | 224 | } |
1da177e4 LT |
225 | } |
226 | ||
227 | void hard_reset_now (void); | |
228 | ||
16dcb4bb | 229 | void machine_restart(char *cmd) |
1da177e4 LT |
230 | { |
231 | hard_reset_now(); | |
232 | } | |
233 | ||
1da177e4 LT |
234 | /* |
235 | * Similar to machine_power_off, but don't shut off power. Add code | |
236 | * here to freeze the system for e.g. post-mortem debug purpose when | |
237 | * possible. This halt has nothing to do with the idle halt. | |
238 | */ | |
239 | ||
240 | void machine_halt(void) | |
241 | { | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /* If or when software power-off is implemented, add code here. */ |
245 | ||
246 | void machine_power_off(void) | |
247 | { | |
248 | } | |
249 | ||
1da177e4 LT |
250 | /* |
251 | * When a process does an "exec", machine state like FPU and debug | |
252 | * registers need to be reset. This is a hook function for that. | |
253 | * Currently we don't have any such state to reset, so this is empty. | |
254 | */ | |
255 | ||
256 | void flush_thread(void) | |
257 | { | |
258 | } | |
259 | ||
260 | /* | |
261 | * fill in the user structure for a core dump.. | |
262 | */ | |
263 | void dump_thread(struct pt_regs * regs, struct user * dump) | |
264 | { | |
265 | #if 0 | |
266 | int i; | |
267 | ||
268 | /* changed the size calculations - should hopefully work better. lbt */ | |
269 | dump->magic = CMAGIC; | |
270 | dump->start_code = 0; | |
271 | dump->start_stack = regs->esp & ~(PAGE_SIZE - 1); | |
272 | dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; | |
273 | dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT; | |
274 | dump->u_dsize -= dump->u_tsize; | |
275 | dump->u_ssize = 0; | |
276 | for (i = 0; i < 8; i++) | |
277 | dump->u_debugreg[i] = current->debugreg[i]; | |
278 | ||
279 | if (dump->start_stack < TASK_SIZE) | |
280 | dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT; | |
281 | ||
282 | dump->regs = *regs; | |
283 | ||
284 | dump->u_fpvalid = dump_fpu (regs, &dump->i387); | |
285 | #endif | |
286 | } | |
287 | ||
288 | /* Fill in the fpu structure for a core dump. */ | |
289 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
290 | { | |
291 | return 0; | |
292 | } |