/* * arch/score/kernel/process.c * * Score Processor version. * * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. *  Chen Liqin <liqin.chen@sunplusct.com> *  Lennox Wu <lennox.wu@sunplusct.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see the file COPYING, or write * to the Free Software Foundation, Inc., * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */ #include <linux/module.h>#include <linux/reboot.h>#include <linux/elfcore.h>#include <linux/pm.h>#include <linux/rcupdate.h> void (*pm_power_off)(void);EXPORT_SYMBOL(pm_power_off); /* If or when software machine-restart is implemented, add code here. */void machine_restart(char *command) {} /* If or when software machine-halt is implemented, add code here. */void machine_halt(void) {} /* If or when software machine-power-off is implemented, add code here. */void machine_power_off(void) {} void ret_from_fork(void);void ret_from_kernel_thread(void); void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp){	unsigned long status; 	/* New thread loses kernel privileges. */	status = regs->cp0_psr & ~(KU_MASK);	status |= KU_USER;	regs->cp0_psr = status;	regs->cp0_epc = pc;	regs->regs[0] = sp;} void exit_thread(void) {} /* * When a process does an "exec", machine state like FPU and debug * registers need to be reset.  This is a hook function for that. * Currently we don't have any such state to reset, so this is empty. */void flush_thread(void) {} /* * set up the kernel stack and exception frames for a new process */int copy_thread(unsigned long clone_flags, unsigned long usp,		unsigned long arg, struct task_struct *p){	struct thread_info *ti = task_thread_info(p);	struct pt_regs *childregs = task_pt_regs(p);	struct pt_regs *regs = current_pt_regs(); 	p->thread.reg0 = (unsigned long) childregs;	if (unlikely(p->flags & PF_KTHREAD)) {		memset(childregs, 0, sizeof(struct pt_regs));		p->thread.reg12 = usp;		p->thread.reg13 = arg;		p->thread.reg3 = (unsigned long) ret_from_kernel_thread;	} else {		*childregs = *current_pt_regs();		childregs->regs[7] = 0;		/* Clear error flag */		childregs->regs[4] = 0;		/* Child gets zero as return value */		if (usp)			childregs->regs[0] = usp;	/* user fork */		p->thread.reg3 = (unsigned long) ret_from_fork;	} 	p->thread.cp0_psr = 0; 	return 0;} /* Fill in the fpu structure for a core dump. */int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r){	return 1;} unsigned long thread_saved_pc(struct task_struct *tsk){	return task_pt_regs(tsk)->cp0_epc;} unsigned long get_wchan(struct task_struct *task){	if (!task || task == current || task->state == TASK_RUNNING)		return 0; 	if (!task_stack_page(task))		return 0; 	return task_pt_regs(task)->cp0_epc;} unsigned long arch_align_stack(unsigned long sp){	return sp;}