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12#include <linux/module.h>
13#include <linux/unistd.h>
14#include <linux/ptrace.h>
15#include <linux/init_task.h>
16#include <linux/tick.h>
17#include <linux/mqueue.h>
18#include <linux/syscalls.h>
19#include <linux/reboot.h>
20
21#include <asm/syscalls.h>
22
23
24void (*c6x_restart)(void);
25void (*c6x_halt)(void);
26
27extern asmlinkage void ret_from_fork(void);
28extern asmlinkage void ret_from_kernel_thread(void);
29
30
31
32
33void (*pm_power_off)(void);
34EXPORT_SYMBOL(pm_power_off);
35
36void arch_cpu_idle(void)
37{
38 unsigned long tmp;
39
40
41
42
43
44
45 asm volatile (" mvc .s2 CSR,%0\n"
46 " or .d2 1,%0,%0\n"
47 " mvc .s2 %0,CSR\n"
48 "|| idle\n"
49 : "=b"(tmp));
50}
51
52static void halt_loop(void)
53{
54 printk(KERN_EMERG "System Halted, OK to turn off power\n");
55 local_irq_disable();
56 while (1)
57 asm volatile("idle\n");
58}
59
60void machine_restart(char *__unused)
61{
62 if (c6x_restart)
63 c6x_restart();
64 halt_loop();
65}
66
67void machine_halt(void)
68{
69 if (c6x_halt)
70 c6x_halt();
71 halt_loop();
72}
73
74void machine_power_off(void)
75{
76 if (pm_power_off)
77 pm_power_off();
78 halt_loop();
79}
80
81void flush_thread(void)
82{
83}
84
85void exit_thread(void)
86{
87}
88
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90
91
92void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
93{
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100
101
102 usp -= 8;
103
104 regs->pc = pc;
105 regs->sp = usp;
106 regs->tsr |= 0x40;
107 current->thread.usp = usp;
108}
109
110
111
112
113int copy_thread(unsigned long clone_flags, unsigned long usp,
114 unsigned long ustk_size,
115 struct task_struct *p)
116{
117 struct pt_regs *childregs;
118
119 childregs = task_pt_regs(p);
120
121 if (unlikely(p->flags & PF_KTHREAD)) {
122
123 memset(childregs, 0, sizeof(struct pt_regs));
124 childregs->sp = (unsigned long)(childregs + 1);
125 p->thread.pc = (unsigned long) ret_from_kernel_thread;
126 childregs->a0 = usp;
127 childregs->a1 = ustk_size;
128 } else {
129
130 *childregs = *current_pt_regs();
131 if (usp)
132 childregs->sp = usp;
133 p->thread.pc = (unsigned long) ret_from_fork;
134 }
135
136
137 p->thread.usp = childregs->sp;
138 thread_saved_ksp(p) = (unsigned long)childregs - 8;
139 p->thread.wchan = p->thread.pc;
140#ifdef __DSBT__
141 {
142 unsigned long dp;
143
144 asm volatile ("mv .S2 b14,%0\n" : "=b"(dp));
145
146 thread_saved_dp(p) = dp;
147 if (usp == -1)
148 childregs->dp = dp;
149 }
150#endif
151 return 0;
152}
153
154unsigned long get_wchan(struct task_struct *p)
155{
156 return p->thread.wchan;
157}
158