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/* MN10300 Process handling code
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/percpu.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
#include <asm/fpu.h>
#include <asm/reset-regs.h>
#include <asm/gdb-stub.h>
#include "internal.h"
/*
* return saved PC of a blocked thread.
*/
unsigned long thread_saved_pc(struct task_struct *tsk)
{
return ((unsigned long *) tsk->thread.sp)[3];
}
/*
* power off function, if any
*/
void (*pm_power_off)(void);
EXPORT_SYMBOL(pm_power_off);
/*
* On SMP it's slightly faster (but much more power-consuming!)
* to poll the ->work.need_resched flag instead of waiting for the
* cross-CPU IPI to arrive. Use this option with caution.
*
* tglx: No idea why this depends on HOTPLUG_CPU !?!
*/
#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
void arch_cpu_idle(void)
{
safe_halt();
}
#endif
void release_segments(struct mm_struct *mm)
{
}
void machine_restart(char *cmd)
{
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
#ifdef mn10300_unit_hard_reset
mn10300_unit_hard_reset();
#else
mn10300_proc_hard_reset();
#endif
}
void machine_halt(void)
{
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
}
void machine_power_off(void)
{
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
}
void show_regs(struct pt_regs *regs)
{
show_regs_print_info(KERN_DEFAULT);
}
/*
* free current thread data structures etc..
*/
void exit_thread(struct task_struct *tsk)
{
exit_fpu(tsk);
}
void flush_thread(void)
{
flush_fpu();
}
void release_thread(struct task_struct *dead_task)
{
}
/*
* we do not have to muck with descriptors here, that is
* done in switch_mm() as needed.
*/
void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
{
}
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
*/
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
unlazy_fpu(src);
*dst = *src;
return 0;
}
/*
* set up the kernel stack for a new thread and copy arch-specific thread
* control information
*/
int copy_thread(unsigned long clone_flags,
unsigned long c_usp, unsigned long ustk_size,
struct task_struct *p)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *c_regs;
unsigned long c_ksp;
c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
/* allocate the userspace exception frame and set it up */
c_ksp -= sizeof(struct pt_regs);
c_regs = (struct pt_regs *) c_ksp;
c_ksp -= 12; /* allocate function call ABI slack */
/* set up things up so the scheduler can start the new task */
p->thread.uregs = c_regs;
ti->frame = c_regs;
p->thread.a3 = (unsigned long) c_regs;
p->thread.sp = c_ksp;
p->thread.wchan = p->thread.pc;
p->thread.usp = c_usp;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(c_regs, 0, sizeof(struct pt_regs));
c_regs->a0 = c_usp; /* function */
c_regs->d0 = ustk_size; /* argument */
local_save_flags(c_regs->epsw);
c_regs->epsw |= EPSW_IE | EPSW_IM_7;
p->thread.pc = (unsigned long) ret_from_kernel_thread;
return 0;
}
*c_regs = *current_pt_regs();
if (c_usp)
c_regs->sp = c_usp;
c_regs->epsw &= ~EPSW_FE; /* my FPU */
/* the new TLS pointer is passed in as arg #5 to sys_clone() */
if (clone_flags & CLONE_SETTLS)
c_regs->e2 = current_frame()->d3;
p->thread.pc = (unsigned long) ret_from_fork;
return 0;
}
unsigned long get_wchan(struct task_struct *p)
{
return p->thread.wchan;
}
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