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Linux/arch/c6x/kernel/process.c

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  1 /*
  2  *  Port on Texas Instruments TMS320C6x architecture
  3  *
  4  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
  5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
  6  *
  7  *  This program is free software; you can redistribute it and/or modify
  8  *  it under the terms of the GNU General Public License version 2 as
  9  *  published by the Free Software Foundation.
 10  *
 11  */
 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 /* hooks for board specific support */
 24 void    (*c6x_restart)(void);
 25 void    (*c6x_halt)(void);
 26 
 27 extern asmlinkage void ret_from_fork(void);
 28 extern asmlinkage void ret_from_kernel_thread(void);
 29 
 30 /*
 31  * power off function, if any
 32  */
 33 void (*pm_power_off)(void);
 34 EXPORT_SYMBOL(pm_power_off);
 35 
 36 void arch_cpu_idle(void)
 37 {
 38         unsigned long tmp;
 39 
 40         /*
 41          * Put local_irq_enable and idle in same execute packet
 42          * to make them atomic and avoid race to idle with
 43          * interrupts enabled.
 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 
 52 static 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 
 60 void machine_restart(char *__unused)
 61 {
 62         if (c6x_restart)
 63                 c6x_restart();
 64         halt_loop();
 65 }
 66 
 67 void machine_halt(void)
 68 {
 69         if (c6x_halt)
 70                 c6x_halt();
 71         halt_loop();
 72 }
 73 
 74 void machine_power_off(void)
 75 {
 76         if (pm_power_off)
 77                 pm_power_off();
 78         halt_loop();
 79 }
 80 
 81 void flush_thread(void)
 82 {
 83 }
 84 
 85 void exit_thread(void)
 86 {
 87 }
 88 
 89 /*
 90  * Do necessary setup to start up a newly executed thread.
 91  */
 92 void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
 93 {
 94         /*
 95          * The binfmt loader will setup a "full" stack, but the C6X
 96          * operates an "empty" stack. So we adjust the usp so that
 97          * argc doesn't get destroyed if an interrupt is taken before
 98          * it is read from the stack.
 99          *
100          * NB: Library startup code needs to match this.
101          */
102         usp -= 8;
103 
104         set_fs(USER_DS);
105         regs->pc  = pc;
106         regs->sp  = usp;
107         regs->tsr |= 0x40; /* set user mode */
108         current->thread.usp = usp;
109 }
110 
111 /*
112  * Copy a new thread context in its stack.
113  */
114 int copy_thread(unsigned long clone_flags, unsigned long usp,
115                 unsigned long ustk_size,
116                 struct task_struct *p)
117 {
118         struct pt_regs *childregs;
119 
120         childregs = task_pt_regs(p);
121 
122         if (unlikely(p->flags & PF_KTHREAD)) {
123                 /* case of  __kernel_thread: we return to supervisor space */
124                 memset(childregs, 0, sizeof(struct pt_regs));
125                 childregs->sp = (unsigned long)(childregs + 1);
126                 p->thread.pc = (unsigned long) ret_from_kernel_thread;
127                 childregs->a0 = usp;            /* function */
128                 childregs->a1 = ustk_size;      /* argument */
129         } else {
130                 /* Otherwise use the given stack */
131                 *childregs = *current_pt_regs();
132                 if (usp)
133                         childregs->sp = usp;
134                 p->thread.pc = (unsigned long) ret_from_fork;
135         }
136 
137         /* Set usp/ksp */
138         p->thread.usp = childregs->sp;
139         thread_saved_ksp(p) = (unsigned long)childregs - 8;
140         p->thread.wchan = p->thread.pc;
141 #ifdef __DSBT__
142         {
143                 unsigned long dp;
144 
145                 asm volatile ("mv .S2 b14,%0\n" : "=b"(dp));
146 
147                 thread_saved_dp(p) = dp;
148                 if (usp == -1)
149                         childregs->dp = dp;
150         }
151 #endif
152         return 0;
153 }
154 
155 unsigned long get_wchan(struct task_struct *p)
156 {
157         return p->thread.wchan;
158 }
159 

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