1
2
3
4
5
6
7
8
9
10
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/pm.h>
14#include <linux/tick.h>
15#include <linux/bitops.h>
16#include <asm/system.h>
17#include <asm/pgalloc.h>
18
19void show_regs(struct pt_regs *regs)
20{
21 printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);
22 printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
23 regs->r1, regs->r2, regs->r3, regs->r4);
24 printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
25 regs->r5, regs->r6, regs->r7, regs->r8);
26 printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
27 regs->r9, regs->r10, regs->r11, regs->r12);
28 printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
29 regs->r13, regs->r14, regs->r15, regs->r16);
30 printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
31 regs->r17, regs->r18, regs->r19, regs->r20);
32 printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
33 regs->r21, regs->r22, regs->r23, regs->r24);
34 printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
35 regs->r25, regs->r26, regs->r27, regs->r28);
36 printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
37 regs->r29, regs->r30, regs->r31, regs->pc);
38 printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
39 regs->msr, regs->ear, regs->esr, regs->fsr);
40}
41
42void (*pm_idle)(void);
43void (*pm_power_off)(void) = NULL;
44EXPORT_SYMBOL(pm_power_off);
45
46static int hlt_counter = 1;
47
48void disable_hlt(void)
49{
50 hlt_counter++;
51}
52EXPORT_SYMBOL(disable_hlt);
53
54void enable_hlt(void)
55{
56 hlt_counter--;
57}
58EXPORT_SYMBOL(enable_hlt);
59
60static int __init nohlt_setup(char *__unused)
61{
62 hlt_counter = 1;
63 return 1;
64}
65__setup("nohlt", nohlt_setup);
66
67static int __init hlt_setup(char *__unused)
68{
69 hlt_counter = 0;
70 return 1;
71}
72__setup("hlt", hlt_setup);
73
74void default_idle(void)
75{
76 if (!hlt_counter) {
77 clear_thread_flag(TIF_POLLING_NRFLAG);
78 smp_mb__after_clear_bit();
79 local_irq_disable();
80 while (!need_resched())
81 cpu_sleep();
82 local_irq_enable();
83 set_thread_flag(TIF_POLLING_NRFLAG);
84 } else
85 while (!need_resched())
86 cpu_relax();
87}
88
89void cpu_idle(void)
90{
91 set_thread_flag(TIF_POLLING_NRFLAG);
92
93
94 while (1) {
95 void (*idle)(void) = pm_idle;
96
97 if (!idle)
98 idle = default_idle;
99
100 tick_nohz_stop_sched_tick(1);
101 while (!need_resched())
102 idle();
103 tick_nohz_restart_sched_tick();
104
105 preempt_enable_no_resched();
106 schedule();
107 preempt_disable();
108 check_pgt_cache();
109 }
110}
111
112void flush_thread(void)
113{
114}
115
116int copy_thread(unsigned long clone_flags, unsigned long usp,
117 unsigned long unused,
118 struct task_struct *p, struct pt_regs *regs)
119{
120 struct pt_regs *childregs = task_pt_regs(p);
121 struct thread_info *ti = task_thread_info(p);
122
123 *childregs = *regs;
124 if (user_mode(regs))
125 childregs->r1 = usp;
126 else
127 childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
128
129#ifndef CONFIG_MMU
130 memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
131 ti->cpu_context.r1 = (unsigned long)childregs;
132 ti->cpu_context.msr = (unsigned long)childregs->msr;
133#else
134
135
136
137 if (kernel_mode(regs))
138
139 childregs->CURRENT_TASK = (unsigned long)p;
140
141
142
143
144
145 if (kernel_mode(regs))
146 memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
147
148
149
150 else {
151 ti->cpu_context = *(struct cpu_context *)regs;
152 childregs->msr |= MSR_UMS;
153 }
154
155
156 ti->cpu_context.r1 = (unsigned long)childregs - STATE_SAVE_ARG_SPACE;
157
158
159
160
161
162
163
164
165
166
167 childregs->msr |= MSR_BIP;
168 childregs->msr &= ~MSR_EIP;
169 childregs->msr |= MSR_IE;
170 childregs->msr &= ~MSR_VM;
171 childregs->msr |= MSR_VMS;
172 childregs->msr |= MSR_EE;
173
174 ti->cpu_context.msr = (childregs->msr|MSR_VM);
175 ti->cpu_context.msr &= ~MSR_UMS;
176#endif
177 ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
178
179 if (clone_flags & CLONE_SETTLS)
180 ;
181
182 return 0;
183}
184
185#ifndef CONFIG_MMU
186
187
188
189unsigned long thread_saved_pc(struct task_struct *tsk)
190{
191 struct cpu_context *ctx =
192 &(((struct thread_info *)(tsk->stack))->cpu_context);
193
194
195 if (in_sched_functions(ctx->r15))
196 return (unsigned long)ctx->r15;
197 else
198 return ctx->r14;
199}
200#endif
201
202static void kernel_thread_helper(int (*fn)(void *), void *arg)
203{
204 fn(arg);
205 do_exit(-1);
206}
207
208int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
209{
210 struct pt_regs regs;
211
212 memset(®s, 0, sizeof(regs));
213
214 regs.r5 = (unsigned long)fn;
215 regs.r6 = (unsigned long)arg;
216 local_save_flags(regs.msr);
217 regs.pc = (unsigned long)kernel_thread_helper;
218 regs.pt_mode = 1;
219
220 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
221 ®s, 0, NULL, NULL);
222}
223EXPORT_SYMBOL_GPL(kernel_thread);
224
225unsigned long get_wchan(struct task_struct *p)
226{
227
228 return 0;
229}
230
231
232void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
233{
234 set_fs(USER_DS);
235 regs->pc = pc;
236 regs->r1 = usp;
237 regs->pt_mode = 0;
238#ifdef CONFIG_MMU
239 regs->msr |= MSR_UMS;
240#endif
241}
242
243#ifdef CONFIG_MMU
244#include <linux/elfcore.h>
245
246
247
248int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpregs)
249{
250 return 0;
251}
252#endif
253