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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m32r/kernel/process.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/m32r/kernel/process.c')
-rw-r--r--arch/m32r/kernel/process.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
new file mode 100644
index 000000000000..b556c3cf6495
--- /dev/null
+++ b/arch/m32r/kernel/process.c
@@ -0,0 +1,359 @@
1/*
2 * linux/arch/m32r/kernel/process.c
3 *
4 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
5 * Hitoshi Yamamoto
6 * Taken from sh version.
7 * Copyright (C) 1995 Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
9 */
10
11#undef DEBUG_PROCESS
12#ifdef DEBUG_PROCESS
13#define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
14 __FUNCTION__, ##args)
15#else
16#define DPRINTK(fmt, args...)
17#endif
18
19/*
20 * This file handles the architecture-dependent parts of process handling..
21 */
22
23#include <linux/fs.h>
24#include <linux/config.h>
25#include <linux/module.h>
26#include <linux/ptrace.h>
27#include <linux/unistd.h>
28#include <linux/slab.h>
29#include <linux/hardirq.h>
30
31#include <asm/io.h>
32#include <asm/uaccess.h>
33#include <asm/mmu_context.h>
34#include <asm/elf.h>
35#include <asm/m32r.h>
36
37#include <linux/err.h>
38
39static int hlt_counter=0;
40
41/*
42 * Return saved PC of a blocked thread.
43 */
44unsigned long thread_saved_pc(struct task_struct *tsk)
45{
46 return tsk->thread.lr;
47}
48
49/*
50 * Powermanagement idle function, if any..
51 */
52void (*pm_idle)(void) = NULL;
53
54void disable_hlt(void)
55{
56 hlt_counter++;
57}
58
59EXPORT_SYMBOL(disable_hlt);
60
61void enable_hlt(void)
62{
63 hlt_counter--;
64}
65
66EXPORT_SYMBOL(enable_hlt);
67
68/*
69 * We use this is we don't have any better
70 * idle routine..
71 */
72void default_idle(void)
73{
74 /* M32R_FIXME: Please use "cpu_sleep" mode. */
75 cpu_relax();
76}
77
78/*
79 * On SMP it's slightly faster (but much more power-consuming!)
80 * to poll the ->work.need_resched flag instead of waiting for the
81 * cross-CPU IPI to arrive. Use this option with caution.
82 */
83static void poll_idle (void)
84{
85 /* M32R_FIXME */
86 cpu_relax();
87}
88
89/*
90 * The idle thread. There's no useful work to be
91 * done, so just try to conserve power and have a
92 * low exit latency (ie sit in a loop waiting for
93 * somebody to say that they'd like to reschedule)
94 */
95void cpu_idle (void)
96{
97 /* endless idle loop with no priority at all */
98 while (1) {
99 while (!need_resched()) {
100 void (*idle)(void) = pm_idle;
101
102 if (!idle)
103 idle = default_idle;
104
105 idle();
106 }
107 schedule();
108 }
109}
110
111void machine_restart(char *__unused)
112{
113 printk("Please push reset button!\n");
114 while (1)
115 cpu_relax();
116}
117
118EXPORT_SYMBOL(machine_restart);
119
120void machine_halt(void)
121{
122 printk("Please push reset button!\n");
123 while (1)
124 cpu_relax();
125}
126
127EXPORT_SYMBOL(machine_halt);
128
129void machine_power_off(void)
130{
131 /* M32R_FIXME */
132}
133
134EXPORT_SYMBOL(machine_power_off);
135
136static int __init idle_setup (char *str)
137{
138 if (!strncmp(str, "poll", 4)) {
139 printk("using poll in idle threads.\n");
140 pm_idle = poll_idle;
141 } else if (!strncmp(str, "sleep", 4)) {
142 printk("using sleep in idle threads.\n");
143 pm_idle = default_idle;
144 }
145
146 return 1;
147}
148
149__setup("idle=", idle_setup);
150
151void show_regs(struct pt_regs * regs)
152{
153 printk("\n");
154 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
155 regs->bpc, regs->psw, regs->lr, regs->fp);
156 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
157 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
158 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
159 regs->r0, regs->r1, regs->r2, regs->r3);
160 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
161 regs->r4, regs->r5, regs->r6, regs->r7);
162 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
163 regs->r8, regs->r9, regs->r10, regs->r11);
164 printk("R12[%08lx]\n", \
165 regs->r12);
166
167#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
168 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
169 regs->acc0h, regs->acc0l);
170 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
171 regs->acc1h, regs->acc1l);
172#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
173 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
174 regs->acch, regs->accl);
175#else
176#error unknown isa configuration
177#endif
178}
179
180/*
181 * Create a kernel thread
182 */
183
184/*
185 * This is the mechanism for creating a new kernel thread.
186 *
187 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
188 * who haven't done an "execve()") should use this: it will work within
189 * a system call from a "real" process, but the process memory space will
190 * not be free'd until both the parent and the child have exited.
191 */
192static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
193{
194 fn(arg);
195 do_exit(-1);
196}
197
198int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
199{
200 struct pt_regs regs;
201
202 memset(&regs, 0, sizeof (regs));
203 regs.r1 = (unsigned long)fn;
204 regs.r2 = (unsigned long)arg;
205
206 regs.bpc = (unsigned long)kernel_thread_helper;
207
208 regs.psw = M32R_PSW_BIE;
209
210 /* Ok, create the new process. */
211 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
212 NULL);
213}
214
215/*
216 * Free current thread data structures etc..
217 */
218void exit_thread(void)
219{
220 /* Nothing to do. */
221 DPRINTK("pid = %d\n", current->pid);
222}
223
224void flush_thread(void)
225{
226 DPRINTK("pid = %d\n", current->pid);
227 memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
228}
229
230void release_thread(struct task_struct *dead_task)
231{
232 /* do nothing */
233 DPRINTK("pid = %d\n", dead_task->pid);
234}
235
236/* Fill in the fpu structure for a core dump.. */
237int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
238{
239 return 0; /* Task didn't use the fpu at all. */
240}
241
242int copy_thread(int nr, unsigned long clone_flags, unsigned long spu,
243 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
244{
245 struct pt_regs *childregs;
246 unsigned long sp = (unsigned long)tsk->thread_info + THREAD_SIZE;
247 extern void ret_from_fork(void);
248
249 /* Copy registers */
250 sp -= sizeof (struct pt_regs);
251 childregs = (struct pt_regs *)sp;
252 *childregs = *regs;
253
254 childregs->spu = spu;
255 childregs->r0 = 0; /* Child gets zero as return value */
256 regs->r0 = tsk->pid;
257 tsk->thread.sp = (unsigned long)childregs;
258 tsk->thread.lr = (unsigned long)ret_from_fork;
259
260 return 0;
261}
262
263/*
264 * fill in the user structure for a core dump..
265 */
266void dump_thread(struct pt_regs * regs, struct user * dump)
267{
268 /* M32R_FIXME */
269}
270
271/*
272 * Capture the user space registers if the task is not running (in user space)
273 */
274int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
275{
276 /* M32R_FIXME */
277 return 1;
278}
279
280asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
281 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
282 struct pt_regs regs)
283{
284#ifdef CONFIG_MMU
285 return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
286#else
287 return -EINVAL;
288#endif /* CONFIG_MMU */
289}
290
291asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
292 unsigned long parent_tidptr,
293 unsigned long child_tidptr,
294 unsigned long r4, unsigned long r5, unsigned long r6,
295 struct pt_regs regs)
296{
297 if (!newsp)
298 newsp = regs.spu;
299
300 return do_fork(clone_flags, newsp, &regs, 0,
301 (int __user *)parent_tidptr, (int __user *)child_tidptr);
302}
303
304/*
305 * This is trivial, and on the face of it looks like it
306 * could equally well be done in user mode.
307 *
308 * Not so, for quite unobvious reasons - register pressure.
309 * In user mode vfork() cannot have a stack frame, and if
310 * done by calling the "clone()" system call directly, you
311 * do not have enough call-clobbered registers to hold all
312 * the information you need.
313 */
314asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
315 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
316 struct pt_regs regs)
317{
318 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
319 NULL, NULL);
320}
321
322/*
323 * sys_execve() executes a new program.
324 */
325asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
326 char __user * __user *uenvp,
327 unsigned long r3, unsigned long r4, unsigned long r5,
328 unsigned long r6, struct pt_regs regs)
329{
330 int error;
331 char *filename;
332
333 filename = getname(ufilename);
334 error = PTR_ERR(filename);
335 if (IS_ERR(filename))
336 goto out;
337
338 error = do_execve(filename, uargv, uenvp, &regs);
339 if (error == 0) {
340 task_lock(current);
341 current->ptrace &= ~PT_DTRACE;
342 task_unlock(current);
343 }
344 putname(filename);
345out:
346 return error;
347}
348
349/*
350 * These bracket the sleeping functions..
351 */
352#define first_sched ((unsigned long) scheduling_functions_start_here)
353#define last_sched ((unsigned long) scheduling_functions_end_here)
354
355unsigned long get_wchan(struct task_struct *p)
356{
357 /* M32R_FIXME */
358 return (0);
359}