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1da177e4 LT |
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__, \ | |
80a914dc | 14 | __func__, ##args) |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
1da177e4 LT |
38 | /* |
39 | * Return saved PC of a blocked thread. | |
40 | */ | |
41 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
42 | { | |
43 | return tsk->thread.lr; | |
44 | } | |
45 | ||
46 | /* | |
47 | * Powermanagement idle function, if any.. | |
48 | */ | |
81e48073 | 49 | static void (*pm_idle)(void) = NULL; |
5e38291d EB |
50 | |
51 | void (*pm_power_off)(void) = NULL; | |
52 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 | 53 | |
1da177e4 LT |
54 | /* |
55 | * We use this is we don't have any better | |
56 | * idle routine.. | |
57 | */ | |
81e48073 | 58 | static void default_idle(void) |
1da177e4 LT |
59 | { |
60 | /* M32R_FIXME: Please use "cpu_sleep" mode. */ | |
61 | cpu_relax(); | |
62 | } | |
63 | ||
64 | /* | |
65 | * On SMP it's slightly faster (but much more power-consuming!) | |
66 | * to poll the ->work.need_resched flag instead of waiting for the | |
67 | * cross-CPU IPI to arrive. Use this option with caution. | |
68 | */ | |
69 | static void poll_idle (void) | |
70 | { | |
71 | /* M32R_FIXME */ | |
72 | cpu_relax(); | |
73 | } | |
74 | ||
75 | /* | |
76 | * The idle thread. There's no useful work to be | |
77 | * done, so just try to conserve power and have a | |
78 | * low exit latency (ie sit in a loop waiting for | |
79 | * somebody to say that they'd like to reschedule) | |
80 | */ | |
81 | void cpu_idle (void) | |
82 | { | |
83 | /* endless idle loop with no priority at all */ | |
84 | while (1) { | |
85 | while (!need_resched()) { | |
86 | void (*idle)(void) = pm_idle; | |
87 | ||
88 | if (!idle) | |
89 | idle = default_idle; | |
90 | ||
91 | idle(); | |
92 | } | |
5bfb5d69 | 93 | preempt_enable_no_resched(); |
1da177e4 | 94 | schedule(); |
5bfb5d69 | 95 | preempt_disable(); |
1da177e4 LT |
96 | } |
97 | } | |
98 | ||
99 | void machine_restart(char *__unused) | |
100 | { | |
0d34c86c HT |
101 | #if defined(CONFIG_PLAT_MAPPI3) |
102 | outw(1, (unsigned long)PLD_REBOOT); | |
103 | #endif | |
104 | ||
1da177e4 LT |
105 | printk("Please push reset button!\n"); |
106 | while (1) | |
107 | cpu_relax(); | |
108 | } | |
109 | ||
1da177e4 LT |
110 | void machine_halt(void) |
111 | { | |
112 | printk("Please push reset button!\n"); | |
113 | while (1) | |
114 | cpu_relax(); | |
115 | } | |
116 | ||
1da177e4 LT |
117 | void machine_power_off(void) |
118 | { | |
119 | /* M32R_FIXME */ | |
120 | } | |
121 | ||
1da177e4 LT |
122 | static int __init idle_setup (char *str) |
123 | { | |
124 | if (!strncmp(str, "poll", 4)) { | |
125 | printk("using poll in idle threads.\n"); | |
126 | pm_idle = poll_idle; | |
127 | } else if (!strncmp(str, "sleep", 4)) { | |
128 | printk("using sleep in idle threads.\n"); | |
129 | pm_idle = default_idle; | |
130 | } | |
131 | ||
132 | return 1; | |
133 | } | |
134 | ||
135 | __setup("idle=", idle_setup); | |
136 | ||
137 | void show_regs(struct pt_regs * regs) | |
138 | { | |
139 | printk("\n"); | |
140 | printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \ | |
141 | regs->bpc, regs->psw, regs->lr, regs->fp); | |
142 | printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \ | |
143 | regs->bbpc, regs->bbpsw, regs->spu, regs->spi); | |
144 | printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \ | |
145 | regs->r0, regs->r1, regs->r2, regs->r3); | |
146 | printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \ | |
147 | regs->r4, regs->r5, regs->r6, regs->r7); | |
148 | printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \ | |
149 | regs->r8, regs->r9, regs->r10, regs->r11); | |
150 | printk("R12[%08lx]\n", \ | |
151 | regs->r12); | |
152 | ||
153 | #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2) | |
154 | printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \ | |
155 | regs->acc0h, regs->acc0l); | |
156 | printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \ | |
157 | regs->acc1h, regs->acc1l); | |
158 | #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R) | |
159 | printk("ACCH[%08lx]:ACCL[%08lx]\n", \ | |
9674dcf7 | 160 | regs->acc0h, regs->acc0l); |
1da177e4 LT |
161 | #else |
162 | #error unknown isa configuration | |
163 | #endif | |
164 | } | |
165 | ||
166 | /* | |
167 | * Create a kernel thread | |
168 | */ | |
169 | ||
170 | /* | |
171 | * This is the mechanism for creating a new kernel thread. | |
172 | * | |
173 | * NOTE! Only a kernel-only process(ie the swapper or direct descendants | |
174 | * who haven't done an "execve()") should use this: it will work within | |
175 | * a system call from a "real" process, but the process memory space will | |
176 | * not be free'd until both the parent and the child have exited. | |
177 | */ | |
178 | static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg) | |
179 | { | |
180 | fn(arg); | |
181 | do_exit(-1); | |
182 | } | |
183 | ||
184 | int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) | |
185 | { | |
186 | struct pt_regs regs; | |
187 | ||
188 | memset(®s, 0, sizeof (regs)); | |
189 | regs.r1 = (unsigned long)fn; | |
190 | regs.r2 = (unsigned long)arg; | |
191 | ||
192 | regs.bpc = (unsigned long)kernel_thread_helper; | |
193 | ||
194 | regs.psw = M32R_PSW_BIE; | |
195 | ||
196 | /* Ok, create the new process. */ | |
197 | return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 0, NULL, | |
198 | NULL); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Free current thread data structures etc.. | |
203 | */ | |
204 | void exit_thread(void) | |
205 | { | |
206 | /* Nothing to do. */ | |
207 | DPRINTK("pid = %d\n", current->pid); | |
208 | } | |
209 | ||
210 | void flush_thread(void) | |
211 | { | |
212 | DPRINTK("pid = %d\n", current->pid); | |
213 | memset(¤t->thread.debug_trap, 0, sizeof(struct debug_trap)); | |
214 | } | |
215 | ||
216 | void release_thread(struct task_struct *dead_task) | |
217 | { | |
218 | /* do nothing */ | |
219 | DPRINTK("pid = %d\n", dead_task->pid); | |
220 | } | |
221 | ||
222 | /* Fill in the fpu structure for a core dump.. */ | |
223 | int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu) | |
224 | { | |
225 | return 0; /* Task didn't use the fpu at all. */ | |
226 | } | |
227 | ||
6f2c55b8 | 228 | int copy_thread(unsigned long clone_flags, unsigned long spu, |
1da177e4 LT |
229 | unsigned long unused, struct task_struct *tsk, struct pt_regs *regs) |
230 | { | |
6c3559fc | 231 | struct pt_regs *childregs = task_pt_regs(tsk); |
1da177e4 LT |
232 | extern void ret_from_fork(void); |
233 | ||
234 | /* Copy registers */ | |
1da177e4 LT |
235 | *childregs = *regs; |
236 | ||
237 | childregs->spu = spu; | |
238 | childregs->r0 = 0; /* Child gets zero as return value */ | |
239 | regs->r0 = tsk->pid; | |
240 | tsk->thread.sp = (unsigned long)childregs; | |
241 | tsk->thread.lr = (unsigned long)ret_from_fork; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2, |
247 | unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6, | |
248 | struct pt_regs regs) | |
249 | { | |
250 | #ifdef CONFIG_MMU | |
251 | return do_fork(SIGCHLD, regs.spu, ®s, 0, NULL, NULL); | |
252 | #else | |
253 | return -EINVAL; | |
254 | #endif /* CONFIG_MMU */ | |
255 | } | |
256 | ||
257 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
258 | unsigned long parent_tidptr, | |
259 | unsigned long child_tidptr, | |
260 | unsigned long r4, unsigned long r5, unsigned long r6, | |
261 | struct pt_regs regs) | |
262 | { | |
263 | if (!newsp) | |
264 | newsp = regs.spu; | |
265 | ||
266 | return do_fork(clone_flags, newsp, ®s, 0, | |
267 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
268 | } | |
269 | ||
270 | /* | |
271 | * This is trivial, and on the face of it looks like it | |
272 | * could equally well be done in user mode. | |
273 | * | |
274 | * Not so, for quite unobvious reasons - register pressure. | |
275 | * In user mode vfork() cannot have a stack frame, and if | |
276 | * done by calling the "clone()" system call directly, you | |
277 | * do not have enough call-clobbered registers to hold all | |
278 | * the information you need. | |
279 | */ | |
280 | asmlinkage int sys_vfork(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 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, ®s, 0, | |
285 | NULL, NULL); | |
286 | } | |
287 | ||
288 | /* | |
289 | * sys_execve() executes a new program. | |
290 | */ | |
291 | asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv, | |
292 | char __user * __user *uenvp, | |
293 | unsigned long r3, unsigned long r4, unsigned long r5, | |
294 | unsigned long r6, struct pt_regs regs) | |
295 | { | |
296 | int error; | |
297 | char *filename; | |
298 | ||
299 | filename = getname(ufilename); | |
300 | error = PTR_ERR(filename); | |
301 | if (IS_ERR(filename)) | |
302 | goto out; | |
303 | ||
304 | error = do_execve(filename, uargv, uenvp, ®s); | |
305 | if (error == 0) { | |
306 | task_lock(current); | |
307 | current->ptrace &= ~PT_DTRACE; | |
308 | task_unlock(current); | |
309 | } | |
310 | putname(filename); | |
311 | out: | |
312 | return error; | |
313 | } | |
314 | ||
315 | /* | |
316 | * These bracket the sleeping functions.. | |
317 | */ | |
318 | #define first_sched ((unsigned long) scheduling_functions_start_here) | |
319 | #define last_sched ((unsigned long) scheduling_functions_end_here) | |
320 | ||
321 | unsigned long get_wchan(struct task_struct *p) | |
322 | { | |
323 | /* M32R_FIXME */ | |
324 | return (0); | |
325 | } |