2 * linux/arch/m32r/kernel/process.c
4 * Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
6 * Taken from sh version.
7 * Copyright (C) 1995 Linus Torvalds
8 * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 #define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
16 #define DPRINTK(fmt, args...)
20 * This file handles the architecture-dependent parts of process handling..
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>
31 #include <asm/uaccess.h>
32 #include <asm/mmu_context.h>
36 #include <linux/err.h>
38 static int hlt_counter
=0;
41 * Return saved PC of a blocked thread.
43 unsigned long thread_saved_pc(struct task_struct
*tsk
)
45 return tsk
->thread
.lr
;
49 * Powermanagement idle function, if any..
51 void (*pm_idle
)(void) = NULL
;
52 EXPORT_SYMBOL(pm_idle
);
54 void (*pm_power_off
)(void) = NULL
;
55 EXPORT_SYMBOL(pm_power_off
);
57 void disable_hlt(void)
62 EXPORT_SYMBOL(disable_hlt
);
69 EXPORT_SYMBOL(enable_hlt
);
72 * We use this is we don't have any better
75 void default_idle(void)
77 /* M32R_FIXME: Please use "cpu_sleep" mode. */
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.
86 static void poll_idle (void)
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)
100 /* endless idle loop with no priority at all */
102 while (!need_resched()) {
103 void (*idle
)(void) = pm_idle
;
110 preempt_enable_no_resched();
116 void machine_restart(char *__unused
)
118 #if defined(CONFIG_PLAT_MAPPI3)
119 outw(1, (unsigned long)PLD_REBOOT
);
122 printk("Please push reset button!\n");
127 void machine_halt(void)
129 printk("Please push reset button!\n");
134 void machine_power_off(void)
139 static int __init
idle_setup (char *str
)
141 if (!strncmp(str
, "poll", 4)) {
142 printk("using poll in idle threads.\n");
144 } else if (!strncmp(str
, "sleep", 4)) {
145 printk("using sleep in idle threads.\n");
146 pm_idle
= default_idle
;
152 __setup("idle=", idle_setup
);
154 void show_regs(struct pt_regs
* regs
)
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", \
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
);
179 #error unknown isa configuration
184 * Create a kernel thread
188 * This is the mechanism for creating a new kernel thread.
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.
195 static void kernel_thread_helper(void *nouse
, int (*fn
)(void *), void *arg
)
201 int kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
)
205 memset(®s
, 0, sizeof (regs
));
206 regs
.r1
= (unsigned long)fn
;
207 regs
.r2
= (unsigned long)arg
;
209 regs
.bpc
= (unsigned long)kernel_thread_helper
;
211 regs
.psw
= M32R_PSW_BIE
;
213 /* Ok, create the new process. */
214 return do_fork(flags
| CLONE_VM
| CLONE_UNTRACED
, 0, ®s
, 0, NULL
,
219 * Free current thread data structures etc..
221 void exit_thread(void)
224 DPRINTK("pid = %d\n", current
->pid
);
227 void flush_thread(void)
229 DPRINTK("pid = %d\n", current
->pid
);
230 memset(¤t
->thread
.debug_trap
, 0, sizeof(struct debug_trap
));
233 void release_thread(struct task_struct
*dead_task
)
236 DPRINTK("pid = %d\n", dead_task
->pid
);
239 /* Fill in the fpu structure for a core dump.. */
240 int dump_fpu(struct pt_regs
*regs
, elf_fpregset_t
*fpu
)
242 return 0; /* Task didn't use the fpu at all. */
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
)
248 struct pt_regs
*childregs
= task_pt_regs(tsk
);
249 extern void ret_from_fork(void);
254 childregs
->spu
= spu
;
255 childregs
->r0
= 0; /* Child gets zero as return value */
257 tsk
->thread
.sp
= (unsigned long)childregs
;
258 tsk
->thread
.lr
= (unsigned long)ret_from_fork
;
264 * Capture the user space registers if the task is not running (in user space)
266 int dump_task_regs(struct task_struct
*tsk
, elf_gregset_t
*regs
)
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
,
277 return do_fork(SIGCHLD
, regs
.spu
, ®s
, 0, NULL
, NULL
);
280 #endif /* CONFIG_MMU */
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
,
292 return do_fork(clone_flags
, newsp
, ®s
, 0,
293 (int __user
*)parent_tidptr
, (int __user
*)child_tidptr
);
297 * This is trivial, and on the face of it looks like it
298 * could equally well be done in user mode.
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.
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
,
310 return do_fork(CLONE_VFORK
| CLONE_VM
| SIGCHLD
, regs
.spu
, ®s
, 0,
315 * sys_execve() executes a new program.
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
)
325 filename
= getname(ufilename
);
326 error
= PTR_ERR(filename
);
327 if (IS_ERR(filename
))
330 error
= do_execve(filename
, uargv
, uenvp
, ®s
);
333 current
->ptrace
&= ~PT_DTRACE
;
334 task_unlock(current
);
342 * These bracket the sleeping functions..
344 #define first_sched ((unsigned long) scheduling_functions_start_here)
345 #define last_sched ((unsigned long) scheduling_functions_end_here)
347 unsigned long get_wchan(struct task_struct
*p
)
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