2 * linux/arch/h8300/kernel/process.c
4 * Yoshinori Sato <ysato@users.sourceforge.jp>
8 * linux/arch/m68knommu/kernel/process.c
10 * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
11 * Kenneth Albanowski <kjahds@kjahds.com>,
12 * The Silver Hammer Group, Ltd.
14 * linux/arch/m68k/kernel/process.c
16 * Copyright (C) 1995 Hamish Macdonald
18 * 68060 fixes by Jesper Skov
22 * This file handles the architecture-dependent parts of process handling..
25 #include <linux/errno.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/kernel.h>
30 #include <linux/smp.h>
31 #include <linux/stddef.h>
32 #include <linux/unistd.h>
33 #include <linux/ptrace.h>
34 #include <linux/user.h>
35 #include <linux/interrupt.h>
36 #include <linux/reboot.h>
38 #include <linux/slab.h>
39 #include <linux/rcupdate.h>
41 #include <asm/uaccess.h>
42 #include <asm/traps.h>
43 #include <asm/setup.h>
44 #include <asm/pgtable.h>
46 void (*pm_power_off
)(void) = NULL
;
47 EXPORT_SYMBOL(pm_power_off
);
49 asmlinkage
void ret_from_fork(void);
50 asmlinkage
void ret_from_kernel_thread(void);
53 * The idle loop on an H8/300..
55 #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
56 static void default_idle(void)
59 if (!need_resched()) {
61 /* XXX: race here! What if need_resched() gets set now? */
67 static void default_idle(void)
72 void (*idle
)(void) = default_idle
;
75 * The idle thread. There's no useful work to be
76 * done, so just try to conserve power and have a
77 * low exit latency (ie sit in a loop waiting for
78 * somebody to say that they'd like to reschedule)
84 while (!need_resched())
87 schedule_preempt_disabled();
91 void machine_restart(char * __unused
)
97 void machine_halt(void)
104 void machine_power_off(void)
111 void show_regs(struct pt_regs
* regs
)
113 printk("\nPC: %08lx Status: %02x",
114 regs
->pc
, regs
->ccr
);
115 printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
116 regs
->orig_er0
, regs
->er0
, regs
->er1
);
117 printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
118 regs
->er2
, regs
->er3
, regs
->er4
, regs
->er5
);
119 printk("\nER6' %08lx ",regs
->er6
);
121 printk("USP: %08lx\n", rdusp());
126 void flush_thread(void)
130 int copy_thread(unsigned long clone_flags
,
131 unsigned long usp
, unsigned long topstk
,
132 struct task_struct
* p
)
134 struct pt_regs
* childregs
;
136 childregs
= (struct pt_regs
*) (THREAD_SIZE
+ task_stack_page(p
)) - 1;
138 if (unlikely(p
->flags
& PF_KTHREAD
)) {
139 memset(childregs
, 0, sizeof(struct pt_regs
));
140 childregs
->retpc
= (unsigned long) ret_from_kernel_thread
;
141 childregs
->er4
= topstk
; /* arg */
142 childregs
->er5
= usp
; /* fn */
143 p
->thread
.ksp
= (unsigned long)childregs
;
145 *childregs
= *current_pt_regs();
146 childregs
->retpc
= (unsigned long) ret_from_fork
;
148 p
->thread
.usp
= usp
?: rdusp();
149 p
->thread
.ksp
= (unsigned long)childregs
;
154 unsigned long thread_saved_pc(struct task_struct
*tsk
)
156 return ((struct pt_regs
*)tsk
->thread
.esp0
)->pc
;
159 unsigned long get_wchan(struct task_struct
*p
)
161 unsigned long fp
, pc
;
162 unsigned long stack_page
;
164 if (!p
|| p
== current
|| p
->state
== TASK_RUNNING
)
167 stack_page
= (unsigned long)p
;
168 fp
= ((struct pt_regs
*)p
->thread
.ksp
)->er6
;
170 if (fp
< stack_page
+sizeof(struct thread_info
) ||
171 fp
>= 8184+stack_page
)
173 pc
= ((unsigned long *)fp
)[1];
174 if (!in_sched_functions(pc
))
176 fp
= *(unsigned long *) fp
;
177 } while (count
++ < 16);
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