179 lines
3.9 KiB
C
179 lines
3.9 KiB
C
/*
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* linux/arch/h8300/kernel/process.c
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*
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* Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* Based on:
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*
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* linux/arch/m68knommu/kernel/process.c
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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* Kenneth Albanowski <kjahds@kjahds.com>,
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* The Silver Hammer Group, Ltd.
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*
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* linux/arch/m68k/kernel/process.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <asm/uaccess.h>
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#include <asm/traps.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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void (*pm_power_off)(void) = NULL;
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EXPORT_SYMBOL(pm_power_off);
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asmlinkage void ret_from_fork(void);
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asmlinkage void ret_from_kernel_thread(void);
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/*
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* The idle loop on an H8/300..
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*/
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#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
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static void default_idle(void)
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{
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local_irq_disable();
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if (!need_resched()) {
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local_irq_enable();
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/* XXX: race here! What if need_resched() gets set now? */
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__asm__("sleep");
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} else
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local_irq_enable();
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}
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#else
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static void default_idle(void)
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{
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cpu_relax();
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}
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#endif
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void (*idle)(void) = default_idle;
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/*
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* The idle thread. There's no useful work to be
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* done, so just try to conserve power and have a
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* low exit latency (ie sit in a loop waiting for
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* somebody to say that they'd like to reschedule)
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*/
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void cpu_idle(void)
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{
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while (1) {
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rcu_idle_enter();
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while (!need_resched())
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idle();
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rcu_idle_exit();
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schedule_preempt_disabled();
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}
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}
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void machine_restart(char * __unused)
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{
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local_irq_disable();
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__asm__("jmp @@0");
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}
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void machine_halt(void)
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{
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local_irq_disable();
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__asm__("sleep");
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for (;;);
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}
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void machine_power_off(void)
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{
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local_irq_disable();
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__asm__("sleep");
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for (;;);
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}
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void show_regs(struct pt_regs * regs)
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{
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printk("\nPC: %08lx Status: %02x",
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regs->pc, regs->ccr);
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printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
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regs->orig_er0, regs->er0, regs->er1);
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printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
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regs->er2, regs->er3, regs->er4, regs->er5);
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printk("\nER6' %08lx ",regs->er6);
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if (user_mode(regs))
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printk("USP: %08lx\n", rdusp());
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else
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printk("\n");
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}
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void flush_thread(void)
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{
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}
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int copy_thread(unsigned long clone_flags,
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unsigned long usp, unsigned long topstk,
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struct task_struct * p)
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{
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struct pt_regs * childregs;
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childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
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if (unlikely(p->flags & PF_KTHREAD)) {
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memset(childregs, 0, sizeof(struct pt_regs));
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childregs->retpc = (unsigned long) ret_from_kernel_thread;
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childregs->er4 = topstk; /* arg */
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childregs->er5 = usp; /* fn */
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p->thread.ksp = (unsigned long)childregs;
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}
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*childregs = *current_pt_regs();
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childregs->retpc = (unsigned long) ret_from_fork;
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childregs->er0 = 0;
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p->thread.usp = usp ?: rdusp();
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p->thread.ksp = (unsigned long)childregs;
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return 0;
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}
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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return ((struct pt_regs *)tsk->thread.esp0)->pc;
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long fp, pc;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)p;
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fp = ((struct pt_regs *)p->thread.ksp)->er6;
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do {
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if (fp < stack_page+sizeof(struct thread_info) ||
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fp >= 8184+stack_page)
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return 0;
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pc = ((unsigned long *)fp)[1];
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if (!in_sched_functions(pc))
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return pc;
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fp = *(unsigned long *) fp;
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} while (count++ < 16);
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return 0;
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}
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