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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> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/smp.h> | |
b920de1b DH |
17 | #include <linux/stddef.h> |
18 | #include <linux/unistd.h> | |
19 | #include <linux/ptrace.h> | |
b920de1b | 20 | #include <linux/user.h> |
b920de1b DH |
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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
5b0753a9 | 28 | #include <linux/rcupdate.h> |
b920de1b DH |
29 | #include <asm/uaccess.h> |
30 | #include <asm/pgtable.h> | |
b920de1b DH |
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 | ||
b920de1b DH |
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 | ||
368dd5ac AT |
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. | |
af695cd9 TG |
57 | * |
58 | * tglx: No idea why this depends on HOTPLUG_CPU !?! | |
368dd5ac | 59 | */ |
af695cd9 TG |
60 | #if !defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU) |
61 | void arch_cpu_idle(void) | |
b920de1b | 62 | { |
af695cd9 | 63 | safe_halt(); |
b920de1b | 64 | } |
af695cd9 | 65 | #endif |
b920de1b DH |
66 | |
67 | void release_segments(struct mm_struct *mm) | |
68 | { | |
69 | } | |
70 | ||
71 | void machine_restart(char *cmd) | |
72 | { | |
044264bb | 73 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
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 | { | |
044264bb | 86 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
87 | gdbstub_exit(0); |
88 | #endif | |
89 | } | |
90 | ||
91 | void machine_power_off(void) | |
92 | { | |
044264bb | 93 | #ifdef CONFIG_KERNEL_DEBUGGER |
b920de1b DH |
94 | gdbstub_exit(0); |
95 | #endif | |
96 | } | |
97 | ||
98 | void show_regs(struct pt_regs *regs) | |
99 | { | |
a43cb95d | 100 | show_regs_print_info(KERN_DEFAULT); |
b920de1b DH |
101 | } |
102 | ||
b920de1b DH |
103 | /* |
104 | * free current thread data structures etc.. | |
105 | */ | |
e6464694 | 106 | void exit_thread(struct task_struct *tsk) |
b920de1b | 107 | { |
e6464694 | 108 | exit_fpu(tsk); |
b920de1b DH |
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 | /* | |
55ccf3fe SS |
129 | * this gets called so that we can store lazy state into memory and copy the |
130 | * current task into the new thread. | |
b920de1b | 131 | */ |
55ccf3fe | 132 | int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
b920de1b | 133 | { |
55ccf3fe SS |
134 | unlazy_fpu(src); |
135 | *dst = *src; | |
136 | return 0; | |
b920de1b DH |
137 | } |
138 | ||
139 | /* | |
140 | * set up the kernel stack for a new thread and copy arch-specific thread | |
141 | * control information | |
142 | */ | |
6f2c55b8 | 143 | int copy_thread(unsigned long clone_flags, |
b920de1b | 144 | unsigned long c_usp, unsigned long ustk_size, |
afa86fc4 | 145 | struct task_struct *p) |
b920de1b | 146 | { |
7c7fcf76 | 147 | struct thread_info *ti = task_thread_info(p); |
255461c5 | 148 | struct pt_regs *c_regs; |
b920de1b DH |
149 | unsigned long c_ksp; |
150 | ||
b920de1b DH |
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); | |
255461c5 | 155 | c_regs = (struct pt_regs *) c_ksp; |
61b7fbc3 | 156 | c_ksp -= 12; /* allocate function call ABI slack */ |
b920de1b | 157 | |
61b7fbc3 | 158 | /* set up things up so the scheduler can start the new task */ |
255461c5 | 159 | p->thread.uregs = c_regs; |
61b7fbc3 AV |
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; | |
b920de1b | 165 | |
1ea2a016 | 166 | if (unlikely(p->flags & PF_KTHREAD)) { |
61b7fbc3 AV |
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 | } | |
1ea2a016 AV |
175 | *c_regs = *current_pt_regs(); |
176 | if (c_usp) | |
177 | c_regs->sp = c_usp; | |
255461c5 | 178 | c_regs->epsw &= ~EPSW_FE; /* my FPU */ |
b920de1b DH |
179 | |
180 | /* the new TLS pointer is passed in as arg #5 to sys_clone() */ | |
181 | if (clone_flags & CLONE_SETTLS) | |
255461c5 | 182 | c_regs->e2 = current_frame()->d3; |
b920de1b | 183 | |
b920de1b | 184 | p->thread.pc = (unsigned long) ret_from_fork; |
b920de1b DH |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
b920de1b DH |
189 | unsigned long get_wchan(struct task_struct *p) |
190 | { | |
191 | return p->thread.wchan; | |
192 | } |