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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>
b17b0153 14#include <linux/sched/debug.h>
29930025 15#include <linux/sched/task.h>
68db0cf1 16#include <linux/sched/task_stack.h>
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17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/smp.h>
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20#include <linux/stddef.h>
21#include <linux/unistd.h>
22#include <linux/ptrace.h>
b920de1b 23#include <linux/user.h>
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24#include <linux/interrupt.h>
25#include <linux/delay.h>
26#include <linux/reboot.h>
27#include <linux/percpu.h>
28#include <linux/err.h>
29#include <linux/fs.h>
5a0e3ad6 30#include <linux/slab.h>
5b0753a9 31#include <linux/rcupdate.h>
7c0f6ba6 32#include <linux/uaccess.h>
b920de1b 33#include <asm/pgtable.h>
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34#include <asm/io.h>
35#include <asm/processor.h>
36#include <asm/mmu_context.h>
37#include <asm/fpu.h>
38#include <asm/reset-regs.h>
39#include <asm/gdb-stub.h>
40#include "internal.h"
41
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42/*
43 * return saved PC of a blocked thread.
44 */
45unsigned long thread_saved_pc(struct task_struct *tsk)
46{
47 return ((unsigned long *) tsk->thread.sp)[3];
48}
49
50/*
51 * power off function, if any
52 */
53void (*pm_power_off)(void);
54EXPORT_SYMBOL(pm_power_off);
55
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56/*
57 * On SMP it's slightly faster (but much more power-consuming!)
58 * to poll the ->work.need_resched flag instead of waiting for the
59 * cross-CPU IPI to arrive. Use this option with caution.
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60 *
61 * tglx: No idea why this depends on HOTPLUG_CPU !?!
368dd5ac 62 */
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63#if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
64void arch_cpu_idle(void)
b920de1b 65{
af695cd9 66 safe_halt();
b920de1b 67}
af695cd9 68#endif
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69
70void release_segments(struct mm_struct *mm)
71{
72}
73
74void machine_restart(char *cmd)
75{
044264bb 76#ifdef CONFIG_KERNEL_DEBUGGER
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77 gdbstub_exit(0);
78#endif
79
80#ifdef mn10300_unit_hard_reset
81 mn10300_unit_hard_reset();
82#else
83 mn10300_proc_hard_reset();
84#endif
85}
86
87void machine_halt(void)
88{
044264bb 89#ifdef CONFIG_KERNEL_DEBUGGER
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90 gdbstub_exit(0);
91#endif
92}
93
94void machine_power_off(void)
95{
044264bb 96#ifdef CONFIG_KERNEL_DEBUGGER
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97 gdbstub_exit(0);
98#endif
99}
100
101void show_regs(struct pt_regs *regs)
102{
a43cb95d 103 show_regs_print_info(KERN_DEFAULT);
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104}
105
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106/*
107 * free current thread data structures etc..
108 */
e6464694 109void exit_thread(struct task_struct *tsk)
b920de1b 110{
e6464694 111 exit_fpu(tsk);
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112}
113
114void flush_thread(void)
115{
116 flush_fpu();
117}
118
119void release_thread(struct task_struct *dead_task)
120{
121}
122
123/*
124 * we do not have to muck with descriptors here, that is
125 * done in switch_mm() as needed.
126 */
127void copy_segments(struct task_struct *p, struct mm_struct *new_mm)
128{
129}
130
131/*
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132 * this gets called so that we can store lazy state into memory and copy the
133 * current task into the new thread.
b920de1b 134 */
55ccf3fe 135int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
b920de1b 136{
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137 unlazy_fpu(src);
138 *dst = *src;
139 return 0;
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140}
141
142/*
143 * set up the kernel stack for a new thread and copy arch-specific thread
144 * control information
145 */
6f2c55b8 146int copy_thread(unsigned long clone_flags,
b920de1b 147 unsigned long c_usp, unsigned long ustk_size,
afa86fc4 148 struct task_struct *p)
b920de1b 149{
7c7fcf76 150 struct thread_info *ti = task_thread_info(p);
255461c5 151 struct pt_regs *c_regs;
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152 unsigned long c_ksp;
153
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154 c_ksp = (unsigned long) task_stack_page(p) + THREAD_SIZE;
155
156 /* allocate the userspace exception frame and set it up */
157 c_ksp -= sizeof(struct pt_regs);
255461c5 158 c_regs = (struct pt_regs *) c_ksp;
61b7fbc3 159 c_ksp -= 12; /* allocate function call ABI slack */
b920de1b 160
61b7fbc3 161 /* set up things up so the scheduler can start the new task */
255461c5 162 p->thread.uregs = c_regs;
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163 ti->frame = c_regs;
164 p->thread.a3 = (unsigned long) c_regs;
165 p->thread.sp = c_ksp;
166 p->thread.wchan = p->thread.pc;
167 p->thread.usp = c_usp;
b920de1b 168
1ea2a016 169 if (unlikely(p->flags & PF_KTHREAD)) {
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170 memset(c_regs, 0, sizeof(struct pt_regs));
171 c_regs->a0 = c_usp; /* function */
172 c_regs->d0 = ustk_size; /* argument */
173 local_save_flags(c_regs->epsw);
174 c_regs->epsw |= EPSW_IE | EPSW_IM_7;
175 p->thread.pc = (unsigned long) ret_from_kernel_thread;
176 return 0;
177 }
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178 *c_regs = *current_pt_regs();
179 if (c_usp)
180 c_regs->sp = c_usp;
255461c5 181 c_regs->epsw &= ~EPSW_FE; /* my FPU */
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182
183 /* the new TLS pointer is passed in as arg #5 to sys_clone() */
184 if (clone_flags & CLONE_SETTLS)
255461c5 185 c_regs->e2 = current_frame()->d3;
b920de1b 186
b920de1b 187 p->thread.pc = (unsigned long) ret_from_fork;
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188
189 return 0;
190}
191
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192unsigned long get_wchan(struct task_struct *p)
193{
194 return p->thread.wchan;
195}