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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__, \ | |
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> | |
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 | ||
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; | |
5e38291d EB |
52 | EXPORT_SYMBOL(pm_idle); |
53 | ||
54 | void (*pm_power_off)(void) = NULL; | |
55 | EXPORT_SYMBOL(pm_power_off); | |
1da177e4 LT |
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 | } | |
5bfb5d69 | 110 | preempt_enable_no_resched(); |
1da177e4 | 111 | schedule(); |
5bfb5d69 | 112 | preempt_disable(); |
1da177e4 LT |
113 | } |
114 | } | |
115 | ||
116 | void machine_restart(char *__unused) | |
117 | { | |
0d34c86c HT |
118 | #if defined(CONFIG_PLAT_MAPPI3) |
119 | outw(1, (unsigned long)PLD_REBOOT); | |
120 | #endif | |
121 | ||
1da177e4 LT |
122 | printk("Please push reset button!\n"); |
123 | while (1) | |
124 | cpu_relax(); | |
125 | } | |
126 | ||
1da177e4 LT |
127 | void machine_halt(void) |
128 | { | |
129 | printk("Please push reset button!\n"); | |
130 | while (1) | |
131 | cpu_relax(); | |
132 | } | |
133 | ||
1da177e4 LT |
134 | void machine_power_off(void) |
135 | { | |
136 | /* M32R_FIXME */ | |
137 | } | |
138 | ||
1da177e4 LT |
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", \ | |
9674dcf7 | 177 | regs->acc0h, regs->acc0l); |
1da177e4 LT |
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(®s, 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, ®s, 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(¤t->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 | { | |
6c3559fc | 248 | struct pt_regs *childregs = task_pt_regs(tsk); |
1da177e4 LT |
249 | extern void ret_from_fork(void); |
250 | ||
251 | /* Copy registers */ | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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, ®s, 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, ®s, 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, ®s, 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, ®s); | |
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 | } |