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Linux/arch/mn10300/kernel/process.c

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  1 /* MN10300  Process handling code
  2  *
  3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 #include <linux/module.h>
 12 #include <linux/errno.h>
 13 #include <linux/sched.h>
 14 #include <linux/kernel.h>
 15 #include <linux/mm.h>
 16 #include <linux/smp.h>
 17 #include <linux/stddef.h>
 18 #include <linux/unistd.h>
 19 #include <linux/ptrace.h>
 20 #include <linux/user.h>
 21 #include <linux/interrupt.h>
 22 #include <linux/delay.h>
 23 #include <linux/reboot.h>
 24 #include <linux/percpu.h>
 25 #include <linux/err.h>
 26 #include <linux/fs.h>
 27 #include <linux/slab.h>
 28 #include <linux/rcupdate.h>
 29 #include <linux/uaccess.h>
 30 #include <asm/pgtable.h>
 31 #include <asm/io.h>
 32 #include <asm/processor.h>
 33 #include <asm/mmu_context.h>
 34 #include <asm/fpu.h>
 35 #include <asm/reset-regs.h>
 36 #include <asm/gdb-stub.h>
 37 #include "internal.h"
 38 
 39 /*
 40  * return saved PC of a blocked thread.
 41  */
 42 unsigned long thread_saved_pc(struct task_struct *tsk)
 43 {
 44         return ((unsigned long *) tsk->thread.sp)[3];
 45 }
 46 
 47 /*
 48  * power off function, if any
 49  */
 50 void (*pm_power_off)(void);
 51 EXPORT_SYMBOL(pm_power_off);
 52 
 53 /*
 54  * On SMP it's slightly faster (but much more power-consuming!)
 55  * to poll the ->work.need_resched flag instead of waiting for the
 56  * cross-CPU IPI to arrive. Use this option with caution.
 57  *
 58  * tglx: No idea why this depends on HOTPLUG_CPU !?!
 59  */
 60 #if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
 61 void arch_cpu_idle(void)
 62 {
 63         safe_halt();
 64 }
 65 #endif
 66 
 67 void release_segments(struct mm_struct *mm)
 68 {
 69 }
 70 
 71 void machine_restart(char *cmd)
 72 {
 73 #ifdef CONFIG_KERNEL_DEBUGGER
 74         gdbstub_exit(0);
 75 #endif
 76 
 77 #ifdef mn10300_unit_hard_reset
 78         mn10300_unit_hard_reset();
 79 #else
 80         mn10300_proc_hard_reset();
 81 #endif
 82 }
 83 
 84 void machine_halt(void)
 85 {
 86 #ifdef CONFIG_KERNEL_DEBUGGER
 87         gdbstub_exit(0);
 88 #endif
 89 }
 90 
 91 void machine_power_off(void)
 92 {
 93 #ifdef CONFIG_KERNEL_DEBUGGER
 94         gdbstub_exit(0);
 95 #endif
 96 }
 97 
 98 void show_regs(struct pt_regs *regs)
 99 {
100         show_regs_print_info(KERN_DEFAULT);
101 }
102 
103 /*
104  * free current thread data structures etc..
105  */
106 void exit_thread(struct task_struct *tsk)
107 {
108         exit_fpu(tsk);
109 }
110 
111 void flush_thread(void)
112 {
113         flush_fpu();
114 }
115 
116 void release_thread(struct task_struct *dead_task)
117 {
118 }
119 
120 /*
121  * we do not have to muck with descriptors here, that is
122  * done in switch_mm() as needed.
123  */
124 void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
125 {
126 }
127 
128 /*
129  * this gets called so that we can store lazy state into memory and copy the
130  * current task into the new thread.
131  */
132 int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
133 {
134         unlazy_fpu(src);
135         *dst = *src;
136         return 0;
137 }
138 
139 /*
140  * set up the kernel stack for a new thread and copy arch-specific thread
141  * control information
142  */
143 int copy_thread(unsigned long clone_flags,
144                 unsigned long c_usp, unsigned long ustk_size,
145                 struct task_struct *p)
146 {
147         struct thread_info *ti = task_thread_info(p);
148         struct pt_regs *c_regs;
149         unsigned long c_ksp;
150 
151         c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
152 
153         /* allocate the userspace exception frame and set it up */
154         c_ksp -= sizeof(struct pt_regs);
155         c_regs = (struct pt_regs *) c_ksp;
156         c_ksp -= 12; /* allocate function call ABI slack */
157 
158         /* set up things up so the scheduler can start the new task */
159         p->thread.uregs = c_regs;
160         ti->frame       = c_regs;
161         p->thread.a3    = (unsigned long) c_regs;
162         p->thread.sp    = c_ksp;
163         p->thread.wchan = p->thread.pc;
164         p->thread.usp   = c_usp;
165 
166         if (unlikely(p->flags & PF_KTHREAD)) {
167                 memset(c_regs, 0, sizeof(struct pt_regs));
168                 c_regs->a0 = c_usp; /* function */
169                 c_regs->d0 = ustk_size; /* argument */
170                 local_save_flags(c_regs->epsw);
171                 c_regs->epsw |= EPSW_IE | EPSW_IM_7;
172                 p->thread.pc    = (unsigned long) ret_from_kernel_thread;
173                 return 0;
174         }
175         *c_regs = *current_pt_regs();
176         if (c_usp)
177                 c_regs->sp = c_usp;
178         c_regs->epsw &= ~EPSW_FE; /* my FPU */
179 
180         /* the new TLS pointer is passed in as arg #5 to sys_clone() */
181         if (clone_flags & CLONE_SETTLS)
182                 c_regs->e2 = current_frame()->d3;
183 
184         p->thread.pc    = (unsigned long) ret_from_fork;
185 
186         return 0;
187 }
188 
189 unsigned long get_wchan(struct task_struct *p)
190 {
191         return p->thread.wchan;
192 }
193 

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