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