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Linux/arch/cris/arch-v32/kernel/process.c

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  1 /*
  2  *  Copyright (C) 2000-2003  Axis Communications AB
  3  *
  4  *  Authors:   Bjorn Wesen (bjornw@axis.com)
  5  *             Mikael Starvik (starvik@axis.com)
  6  *             Tobias Anderberg (tobiasa@axis.com), CRISv32 port.
  7  *
  8  * This file handles the architecture-dependent parts of process handling..
  9  */
 10 
 11 #include <linux/sched.h>
 12 #include <linux/slab.h>
 13 #include <linux/err.h>
 14 #include <linux/fs.h>
 15 #include <hwregs/reg_rdwr.h>
 16 #include <hwregs/reg_map.h>
 17 #include <hwregs/timer_defs.h>
 18 #include <hwregs/intr_vect_defs.h>
 19 #include <linux/ptrace.h>
 20 
 21 extern void stop_watchdog(void);
 22 
 23 /* We use this if we don't have any better idle routine. */
 24 void default_idle(void)
 25 {
 26         local_irq_enable();
 27         /* Halt until exception. */
 28         __asm__ volatile("halt");
 29 }
 30 
 31 /*
 32  * Free current thread data structures etc..
 33  */
 34 
 35 extern void deconfigure_bp(long pid);
 36 void exit_thread(struct task_struct *tsk)
 37 {
 38         deconfigure_bp(tsk->pid);
 39 }
 40 
 41 /*
 42  * If the watchdog is enabled, disable interrupts and enter an infinite loop.
 43  * The watchdog will reset the CPU after 0.1s. If the watchdog isn't enabled
 44  * then enable it and wait.
 45  */
 46 extern void arch_enable_nmi(void);
 47 
 48 void
 49 hard_reset_now(void)
 50 {
 51         /*
 52          * Don't declare this variable elsewhere.  We don't want any other
 53          * code to know about it than the watchdog handler in entry.S and
 54          * this code, implementing hard reset through the watchdog.
 55          */
 56 #if defined(CONFIG_ETRAX_WATCHDOG)
 57         extern int cause_of_death;
 58 #endif
 59 
 60         printk("*** HARD RESET ***\n");
 61         local_irq_disable();
 62 
 63 #if defined(CONFIG_ETRAX_WATCHDOG)
 64         cause_of_death = 0xbedead;
 65 #else
 66 {
 67         reg_timer_rw_wd_ctrl wd_ctrl = {0};
 68 
 69         stop_watchdog();
 70 
 71         wd_ctrl.key = 16;       /* Arbitrary key. */
 72         wd_ctrl.cnt = 1;        /* Minimum time. */
 73         wd_ctrl.cmd = regk_timer_start;
 74 
 75         arch_enable_nmi();
 76         REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl);
 77 }
 78 #endif
 79 
 80         while (1)
 81                 ; /* Wait for reset. */
 82 }
 83 
 84 /*
 85  * Return saved PC of a blocked thread.
 86  */
 87 unsigned long thread_saved_pc(struct task_struct *t)
 88 {
 89         return task_pt_regs(t)->erp;
 90 }
 91 
 92 /*
 93  * Setup the child's kernel stack with a pt_regs and call switch_stack() on it.
 94  * It will be unnested during _resume and _ret_from_sys_call when the new thread
 95  * is scheduled.
 96  *
 97  * Also setup the thread switching structure which is used to keep
 98  * thread-specific data during _resumes.
 99  */
100 
101 extern asmlinkage void ret_from_fork(void);
102 extern asmlinkage void ret_from_kernel_thread(void);
103 
104 int
105 copy_thread(unsigned long clone_flags, unsigned long usp,
106         unsigned long arg, struct task_struct *p)
107 {
108         struct pt_regs *childregs = task_pt_regs(p);
109         struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1;
110 
111         /*
112          * Put the pt_regs structure at the end of the new kernel stack page and
113          * fix it up. Note: the task_struct doubles as the kernel stack for the
114          * task.
115          */
116         if (unlikely(p->flags & PF_KTHREAD)) {
117                 memset(swstack, 0,
118                         sizeof(struct switch_stack) + sizeof(struct pt_regs));
119                 swstack->r1 = usp;
120                 swstack->r2 = arg;
121                 childregs->ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
122                 swstack->return_ip = (unsigned long) ret_from_kernel_thread;
123                 p->thread.ksp = (unsigned long) swstack;
124                 p->thread.usp = 0;
125                 return 0;
126         }
127         *childregs = *current_pt_regs();        /* Struct copy of pt_regs. */
128         childregs->r10 = 0;     /* Child returns 0 after a fork/clone. */
129 
130         /* Set a new TLS ?
131          * The TLS is in $mof because it is the 5th argument to sys_clone.
132          */
133         if (p->mm && (clone_flags & CLONE_SETTLS)) {
134                 task_thread_info(p)->tls = childregs->mof;
135         }
136 
137         /* Put the switch stack right below the pt_regs. */
138 
139         /* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */
140         swstack->r9 = 0;
141 
142         /*
143          * We want to return into ret_from_sys_call after the _resume.
144          * ret_from_fork will call ret_from_sys_call.
145          */
146         swstack->return_ip = (unsigned long) ret_from_fork;
147 
148         /* Fix the user-mode and kernel-mode stackpointer. */
149         p->thread.usp = usp ?: rdusp();
150         p->thread.ksp = (unsigned long) swstack;
151 
152         return 0;
153 }
154 
155 unsigned long
156 get_wchan(struct task_struct *p)
157 {
158         /* TODO */
159         return 0;
160 }
161 #undef last_sched
162 #undef first_sched
163 
164 void show_regs(struct pt_regs * regs)
165 {
166         unsigned long usp = rdusp();
167 
168         show_regs_print_info(KERN_DEFAULT);
169 
170         printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
171                 regs->erp, regs->srp, regs->ccs, usp, regs->mof);
172 
173         printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
174                 regs->r0, regs->r1, regs->r2, regs->r3);
175 
176         printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
177                 regs->r4, regs->r5, regs->r6, regs->r7);
178 
179         printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
180                 regs->r8, regs->r9, regs->r10, regs->r11);
181 
182         printk("r12: %08lx r13: %08lx oR10: %08lx\n",
183                 regs->r12, regs->r13, regs->orig_r10);
184 }
185 

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