/* * 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; }