aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm26/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm26/kernel/process.c')
-rw-r--r--arch/arm26/kernel/process.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/arch/arm26/kernel/process.c b/arch/arm26/kernel/process.c
deleted file mode 100644
index dcd81e62ff4e..000000000000
--- a/arch/arm26/kernel/process.c
+++ /dev/null
@@ -1,392 +0,0 @@
1/*
2 * linux/arch/arm26/kernel/process.c
3 *
4 * Copyright (C) 2003 Ian Molton - adapted for ARM26
5 * Copyright (C) 1996-2000 Russell King - Converted to ARM.
6 * Origional Copyright (C) 1995 Linus Torvalds
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <stdarg.h>
13
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/stddef.h>
19#include <linux/unistd.h>
20#include <linux/ptrace.h>
21#include <linux/slab.h>
22#include <linux/user.h>
23#include <linux/a.out.h>
24#include <linux/delay.h>
25#include <linux/reboot.h>
26#include <linux/interrupt.h>
27#include <linux/init.h>
28
29#include <asm/system.h>
30#include <asm/io.h>
31#include <asm/leds.h>
32#include <asm/processor.h>
33#include <asm/uaccess.h>
34
35extern const char *processor_modes[];
36extern void setup_mm_for_reboot(char mode);
37
38static volatile int hlt_counter;
39
40void disable_hlt(void)
41{
42 hlt_counter++;
43}
44
45EXPORT_SYMBOL(disable_hlt);
46
47void enable_hlt(void)
48{
49 hlt_counter--;
50}
51
52EXPORT_SYMBOL(enable_hlt);
53
54static int __init nohlt_setup(char *__unused)
55{
56 hlt_counter = 1;
57 return 1;
58}
59
60static int __init hlt_setup(char *__unused)
61{
62 hlt_counter = 0;
63 return 1;
64}
65
66__setup("nohlt", nohlt_setup);
67__setup("hlt", hlt_setup);
68
69/*
70 * This is our default idle handler. We need to disable
71 * interrupts here to ensure we don't miss a wakeup call.
72 */
73void cpu_idle(void)
74{
75 /* endless idle loop with no priority at all */
76 while (1) {
77 while (!need_resched())
78 cpu_relax();
79 preempt_enable_no_resched();
80 schedule();
81 preempt_disable();
82 }
83}
84
85static char reboot_mode = 'h';
86
87int __init reboot_setup(char *str)
88{
89 reboot_mode = str[0];
90 return 1;
91}
92
93__setup("reboot=", reboot_setup);
94
95/* ARM26 cant do these but we still need to define them. */
96void machine_halt(void)
97{
98}
99void machine_power_off(void)
100{
101}
102
103void machine_restart(char * __unused)
104{
105 /*
106 * Clean and disable cache, and turn off interrupts
107 */
108 cpu_proc_fin();
109
110 /*
111 * Tell the mm system that we are going to reboot -
112 * we may need it to insert some 1:1 mappings so that
113 * soft boot works.
114 */
115 setup_mm_for_reboot(reboot_mode);
116
117 /*
118 * copy branch instruction to reset location and call it
119 */
120
121 *(unsigned long *)0 = *(unsigned long *)0x03800000;
122 ((void(*)(void))0)();
123
124 /*
125 * Whoops - the architecture was unable to reboot.
126 * Tell the user! Should never happen...
127 */
128 mdelay(1000);
129 printk("Reboot failed -- System halted\n");
130 while (1);
131}
132
133void show_regs(struct pt_regs * regs)
134{
135 unsigned long flags;
136
137 flags = condition_codes(regs);
138
139 printk("pc : [<%08lx>] lr : [<%08lx>] %s\n"
140 "sp : %08lx ip : %08lx fp : %08lx\n",
141 instruction_pointer(regs),
142 regs->ARM_lr, print_tainted(), regs->ARM_sp,
143 regs->ARM_ip, regs->ARM_fp);
144 printk("r10: %08lx r9 : %08lx r8 : %08lx\n",
145 regs->ARM_r10, regs->ARM_r9,
146 regs->ARM_r8);
147 printk("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
148 regs->ARM_r7, regs->ARM_r6,
149 regs->ARM_r5, regs->ARM_r4);
150 printk("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
151 regs->ARM_r3, regs->ARM_r2,
152 regs->ARM_r1, regs->ARM_r0);
153 printk("Flags: %c%c%c%c",
154 flags & PSR_N_BIT ? 'N' : 'n',
155 flags & PSR_Z_BIT ? 'Z' : 'z',
156 flags & PSR_C_BIT ? 'C' : 'c',
157 flags & PSR_V_BIT ? 'V' : 'v');
158 printk(" IRQs o%s FIQs o%s Mode %s Segment %s\n",
159 interrupts_enabled(regs) ? "n" : "ff",
160 fast_interrupts_enabled(regs) ? "n" : "ff",
161 processor_modes[processor_mode(regs)],
162 get_fs() == get_ds() ? "kernel" : "user");
163}
164
165void show_fpregs(struct user_fp *regs)
166{
167 int i;
168
169 for (i = 0; i < 8; i++) {
170 unsigned long *p;
171 char type;
172
173 p = (unsigned long *)(regs->fpregs + i);
174
175 switch (regs->ftype[i]) {
176 case 1: type = 'f'; break;
177 case 2: type = 'd'; break;
178 case 3: type = 'e'; break;
179 default: type = '?'; break;
180 }
181 if (regs->init_flag)
182 type = '?';
183
184 printk(" f%d(%c): %08lx %08lx %08lx%c",
185 i, type, p[0], p[1], p[2], i & 1 ? '\n' : ' ');
186 }
187
188
189 printk("FPSR: %08lx FPCR: %08lx\n",
190 (unsigned long)regs->fpsr,
191 (unsigned long)regs->fpcr);
192}
193
194/*
195 * Task structure and kernel stack allocation.
196 */
197static unsigned long *thread_info_head;
198static unsigned int nr_thread_info;
199
200extern unsigned long get_page_8k(int priority);
201extern void free_page_8k(unsigned long page);
202
203// FIXME - is this valid?
204#define EXTRA_TASK_STRUCT 0
205#define ll_alloc_task_struct() ((struct thread_info *)get_page_8k(GFP_KERNEL))
206#define ll_free_task_struct(p) free_page_8k((unsigned long)(p))
207
208//FIXME - do we use *task param below looks like we dont, which is ok?
209//FIXME - if EXTRA_TASK_STRUCT is zero we can optimise the below away permanently. *IF* its supposed to be zero.
210struct thread_info *alloc_thread_info(struct task_struct *task)
211{
212 struct thread_info *thread = NULL;
213
214 if (EXTRA_TASK_STRUCT) {
215 unsigned long *p = thread_info_head;
216
217 if (p) {
218 thread_info_head = (unsigned long *)p[0];
219 nr_thread_info -= 1;
220 }
221 thread = (struct thread_info *)p;
222 }
223
224 if (!thread)
225 thread = ll_alloc_task_struct();
226
227#ifdef CONFIG_MAGIC_SYSRQ
228 /*
229 * The stack must be cleared if you want SYSRQ-T to
230 * give sensible stack usage information
231 */
232 if (thread) {
233 char *p = (char *)thread;
234 memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE);
235 }
236#endif
237 return thread;
238}
239
240void free_thread_info(struct thread_info *thread)
241{
242 if (EXTRA_TASK_STRUCT && nr_thread_info < EXTRA_TASK_STRUCT) {
243 unsigned long *p = (unsigned long *)thread;
244 p[0] = (unsigned long)thread_info_head;
245 thread_info_head = p;
246 nr_thread_info += 1;
247 } else
248 ll_free_task_struct(thread);
249}
250
251/*
252 * Free current thread data structures etc..
253 */
254void exit_thread(void)
255{
256}
257
258void flush_thread(void)
259{
260 struct thread_info *thread = current_thread_info();
261 struct task_struct *tsk = current;
262
263 memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
264 memset(&thread->fpstate, 0, sizeof(union fp_state));
265
266 clear_used_math();
267}
268
269void release_thread(struct task_struct *dead_task)
270{
271}
272
273asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
274
275int
276copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
277 unsigned long unused, struct task_struct *p, struct pt_regs *regs)
278{
279 struct thread_info *thread = task_thread_info(p);
280 struct pt_regs *childregs = task_pt_regs(p);
281
282 *childregs = *regs;
283 childregs->ARM_r0 = 0;
284 childregs->ARM_sp = stack_start;
285
286 memset(&thread->cpu_context, 0, sizeof(struct cpu_context_save));
287 thread->cpu_context.sp = (unsigned long)childregs;
288 thread->cpu_context.pc = (unsigned long)ret_from_fork | MODE_SVC26 | PSR_I_BIT;
289
290 return 0;
291}
292
293/*
294 * fill in the fpe structure for a core dump...
295 */
296int dump_fpu (struct pt_regs *regs, struct user_fp *fp)
297{
298 struct thread_info *thread = current_thread_info();
299 int used_math = !!used_math();
300
301 if (used_math)
302 memcpy(fp, &thread->fpstate.soft, sizeof (*fp));
303
304 return used_math;
305}
306
307/*
308 * fill in the user structure for a core dump..
309 */
310void dump_thread(struct pt_regs * regs, struct user * dump)
311{
312 struct task_struct *tsk = current;
313
314 dump->magic = CMAGIC;
315 dump->start_code = tsk->mm->start_code;
316 dump->start_stack = regs->ARM_sp & ~(PAGE_SIZE - 1);
317
318 dump->u_tsize = (tsk->mm->end_code - tsk->mm->start_code) >> PAGE_SHIFT;
319 dump->u_dsize = (tsk->mm->brk - tsk->mm->start_data + PAGE_SIZE - 1) >> PAGE_SHIFT;
320 dump->u_ssize = 0;
321
322 dump->u_debugreg[0] = tsk->thread.debug.bp[0].address;
323 dump->u_debugreg[1] = tsk->thread.debug.bp[1].address;
324 dump->u_debugreg[2] = tsk->thread.debug.bp[0].insn;
325 dump->u_debugreg[3] = tsk->thread.debug.bp[1].insn;
326 dump->u_debugreg[4] = tsk->thread.debug.nsaved;
327
328 if (dump->start_stack < 0x04000000)
329 dump->u_ssize = (0x04000000 - dump->start_stack) >> PAGE_SHIFT;
330
331 dump->regs = *regs;
332 dump->u_fpvalid = dump_fpu (regs, &dump->u_fp);
333}
334
335/*
336 * Shuffle the argument into the correct register before calling the
337 * thread function. r1 is the thread argument, r2 is the pointer to
338 * the thread function, and r3 points to the exit function.
339 * FIXME - make sure this is right - the older code used to zero fp
340 * and cause the parent to call sys_exit (do_exit in this version)
341 */
342extern void kernel_thread_helper(void);
343
344asm( ".section .text\n"
345" .align\n"
346" .type kernel_thread_helper, #function\n"
347"kernel_thread_helper:\n"
348" mov r0, r1\n"
349" mov lr, r3\n"
350" mov pc, r2\n"
351" .size kernel_thread_helper, . - kernel_thread_helper\n"
352" .previous");
353
354/*
355 * Create a kernel thread.
356 */
357pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
358{
359 struct pt_regs regs;
360
361 memset(&regs, 0, sizeof(regs));
362
363 regs.ARM_r1 = (unsigned long)arg;
364 regs.ARM_r2 = (unsigned long)fn;
365 regs.ARM_r3 = (unsigned long)do_exit;
366 regs.ARM_pc = (unsigned long)kernel_thread_helper | MODE_SVC26;
367
368 return do_fork(flags|CLONE_VM|CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
369}
370EXPORT_SYMBOL(kernel_thread);
371
372
373unsigned long get_wchan(struct task_struct *p)
374{
375 unsigned long fp, lr;
376 unsigned long stack_page;
377 int count = 0;
378 if (!p || p == current || p->state == TASK_RUNNING)
379 return 0;
380
381 stack_page = 4096 + (unsigned long)p;
382 fp = thread_saved_fp(p);
383 do {
384 if (fp < stack_page || fp > 4092+stack_page)
385 return 0;
386 lr = pc_pointer (((unsigned long *)fp)[-1]);
387 if (!in_sched_functions(lr))
388 return lr;
389 fp = *(unsigned long *) (fp - 12);
390 } while (count ++ < 16);
391 return 0;
392}
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-28 15:54:24 -0400