Merge branch 'linus' into pci-for-jesse
[deliverable/linux.git] / arch / m32r / kernel / process.c
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/module.h>
25 #include <linux/ptrace.h>
26 #include <linux/unistd.h>
27 #include <linux/slab.h>
28 #include <linux/hardirq.h>
29
30 #include <asm/io.h>
31 #include <asm/uaccess.h>
32 #include <asm/mmu_context.h>
33 #include <asm/elf.h>
34 #include <asm/m32r.h>
35
36 #include <linux/err.h>
37
38 static int hlt_counter=0;
39
40 /*
41 * Return saved PC of a blocked thread.
42 */
43 unsigned long thread_saved_pc(struct task_struct *tsk)
44 {
45 return tsk->thread.lr;
46 }
47
48 /*
49 * Powermanagement idle function, if any..
50 */
51 void (*pm_idle)(void) = NULL;
52 EXPORT_SYMBOL(pm_idle);
53
54 void (*pm_power_off)(void) = NULL;
55 EXPORT_SYMBOL(pm_power_off);
56
57 void disable_hlt(void)
58 {
59 hlt_counter++;
60 }
61
62 EXPORT_SYMBOL(disable_hlt);
63
64 void enable_hlt(void)
65 {
66 hlt_counter--;
67 }
68
69 EXPORT_SYMBOL(enable_hlt);
70
71 /*
72 * We use this is we don't have any better
73 * idle routine..
74 */
75 void default_idle(void)
76 {
77 /* M32R_FIXME: Please use "cpu_sleep" mode. */
78 cpu_relax();
79 }
80
81 /*
82 * On SMP it's slightly faster (but much more power-consuming!)
83 * to poll the ->work.need_resched flag instead of waiting for the
84 * cross-CPU IPI to arrive. Use this option with caution.
85 */
86 static void poll_idle (void)
87 {
88 /* M32R_FIXME */
89 cpu_relax();
90 }
91
92 /*
93 * The idle thread. There's no useful work to be
94 * done, so just try to conserve power and have a
95 * low exit latency (ie sit in a loop waiting for
96 * somebody to say that they'd like to reschedule)
97 */
98 void cpu_idle (void)
99 {
100 /* endless idle loop with no priority at all */
101 while (1) {
102 while (!need_resched()) {
103 void (*idle)(void) = pm_idle;
104
105 if (!idle)
106 idle = default_idle;
107
108 idle();
109 }
110 preempt_enable_no_resched();
111 schedule();
112 preempt_disable();
113 }
114 }
115
116 void machine_restart(char *__unused)
117 {
118 #if defined(CONFIG_PLAT_MAPPI3)
119 outw(1, (unsigned long)PLD_REBOOT);
120 #endif
121
122 printk("Please push reset button!\n");
123 while (1)
124 cpu_relax();
125 }
126
127 void machine_halt(void)
128 {
129 printk("Please push reset button!\n");
130 while (1)
131 cpu_relax();
132 }
133
134 void machine_power_off(void)
135 {
136 /* M32R_FIXME */
137 }
138
139 static int __init idle_setup (char *str)
140 {
141 if (!strncmp(str, "poll", 4)) {
142 printk("using poll in idle threads.\n");
143 pm_idle = poll_idle;
144 } else if (!strncmp(str, "sleep", 4)) {
145 printk("using sleep in idle threads.\n");
146 pm_idle = default_idle;
147 }
148
149 return 1;
150 }
151
152 __setup("idle=", idle_setup);
153
154 void show_regs(struct pt_regs * regs)
155 {
156 printk("\n");
157 printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
158 regs->bpc, regs->psw, regs->lr, regs->fp);
159 printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
160 regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
161 printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
162 regs->r0, regs->r1, regs->r2, regs->r3);
163 printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
164 regs->r4, regs->r5, regs->r6, regs->r7);
165 printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
166 regs->r8, regs->r9, regs->r10, regs->r11);
167 printk("R12[%08lx]\n", \
168 regs->r12);
169
170 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
171 printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
172 regs->acc0h, regs->acc0l);
173 printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
174 regs->acc1h, regs->acc1l);
175 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
176 printk("ACCH[%08lx]:ACCL[%08lx]\n", \
177 regs->acc0h, regs->acc0l);
178 #else
179 #error unknown isa configuration
180 #endif
181 }
182
183 /*
184 * Create a kernel thread
185 */
186
187 /*
188 * This is the mechanism for creating a new kernel thread.
189 *
190 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
191 * who haven't done an "execve()") should use this: it will work within
192 * a system call from a "real" process, but the process memory space will
193 * not be free'd until both the parent and the child have exited.
194 */
195 static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
196 {
197 fn(arg);
198 do_exit(-1);
199 }
200
201 int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
202 {
203 struct pt_regs regs;
204
205 memset(&regs, 0, sizeof (regs));
206 regs.r1 = (unsigned long)fn;
207 regs.r2 = (unsigned long)arg;
208
209 regs.bpc = (unsigned long)kernel_thread_helper;
210
211 regs.psw = M32R_PSW_BIE;
212
213 /* Ok, create the new process. */
214 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
215 NULL);
216 }
217
218 /*
219 * Free current thread data structures etc..
220 */
221 void exit_thread(void)
222 {
223 /* Nothing to do. */
224 DPRINTK("pid = %d\n", current->pid);
225 }
226
227 void flush_thread(void)
228 {
229 DPRINTK("pid = %d\n", current->pid);
230 memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
231 }
232
233 void release_thread(struct task_struct *dead_task)
234 {
235 /* do nothing */
236 DPRINTK("pid = %d\n", dead_task->pid);
237 }
238
239 /* Fill in the fpu structure for a core dump.. */
240 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
241 {
242 return 0; /* Task didn't use the fpu at all. */
243 }
244
245 int copy_thread(int nr, unsigned long clone_flags, unsigned long spu,
246 unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
247 {
248 struct pt_regs *childregs = task_pt_regs(tsk);
249 extern void ret_from_fork(void);
250
251 /* Copy registers */
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 * Capture the user space registers if the task is not running (in user space)
265 */
266 int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
267 {
268 /* M32R_FIXME */
269 return 1;
270 }
271
272 asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
273 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
274 struct pt_regs regs)
275 {
276 #ifdef CONFIG_MMU
277 return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
278 #else
279 return -EINVAL;
280 #endif /* CONFIG_MMU */
281 }
282
283 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
284 unsigned long parent_tidptr,
285 unsigned long child_tidptr,
286 unsigned long r4, unsigned long r5, unsigned long r6,
287 struct pt_regs regs)
288 {
289 if (!newsp)
290 newsp = regs.spu;
291
292 return do_fork(clone_flags, newsp, &regs, 0,
293 (int __user *)parent_tidptr, (int __user *)child_tidptr);
294 }
295
296 /*
297 * This is trivial, and on the face of it looks like it
298 * could equally well be done in user mode.
299 *
300 * Not so, for quite unobvious reasons - register pressure.
301 * In user mode vfork() cannot have a stack frame, and if
302 * done by calling the "clone()" system call directly, you
303 * do not have enough call-clobbered registers to hold all
304 * the information you need.
305 */
306 asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
307 unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
308 struct pt_regs regs)
309 {
310 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
311 NULL, NULL);
312 }
313
314 /*
315 * sys_execve() executes a new program.
316 */
317 asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
318 char __user * __user *uenvp,
319 unsigned long r3, unsigned long r4, unsigned long r5,
320 unsigned long r6, struct pt_regs regs)
321 {
322 int error;
323 char *filename;
324
325 filename = getname(ufilename);
326 error = PTR_ERR(filename);
327 if (IS_ERR(filename))
328 goto out;
329
330 error = do_execve(filename, uargv, uenvp, &regs);
331 if (error == 0) {
332 task_lock(current);
333 current->ptrace &= ~PT_DTRACE;
334 task_unlock(current);
335 }
336 putname(filename);
337 out:
338 return error;
339 }
340
341 /*
342 * These bracket the sleeping functions..
343 */
344 #define first_sched ((unsigned long) scheduling_functions_start_here)
345 #define last_sched ((unsigned long) scheduling_functions_end_here)
346
347 unsigned long get_wchan(struct task_struct *p)
348 {
349 /* M32R_FIXME */
350 return (0);
351 }
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