188 строки
4.7 KiB
C
188 строки
4.7 KiB
C
/*
|
|
* Copyright (C) 2000-2003 Axis Communications AB
|
|
*
|
|
* Authors: Bjorn Wesen (bjornw@axis.com)
|
|
* Mikael Starvik (starvik@axis.com)
|
|
* Tobias Anderberg (tobiasa@axis.com), CRISv32 port.
|
|
*
|
|
* This file handles the architecture-dependent parts of process handling..
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/sched/task.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/fs.h>
|
|
#include <hwregs/reg_rdwr.h>
|
|
#include <hwregs/reg_map.h>
|
|
#include <hwregs/timer_defs.h>
|
|
#include <hwregs/intr_vect_defs.h>
|
|
#include <linux/ptrace.h>
|
|
|
|
extern void stop_watchdog(void);
|
|
|
|
/* We use this if we don't have any better idle routine. */
|
|
void default_idle(void)
|
|
{
|
|
local_irq_enable();
|
|
/* Halt until exception. */
|
|
__asm__ volatile("halt");
|
|
}
|
|
|
|
/*
|
|
* Free current thread data structures etc..
|
|
*/
|
|
|
|
extern void deconfigure_bp(long pid);
|
|
void exit_thread(struct task_struct *tsk)
|
|
{
|
|
deconfigure_bp(tsk->pid);
|
|
}
|
|
|
|
/*
|
|
* If the watchdog is enabled, disable interrupts and enter an infinite loop.
|
|
* The watchdog will reset the CPU after 0.1s. If the watchdog isn't enabled
|
|
* then enable it and wait.
|
|
*/
|
|
extern void arch_enable_nmi(void);
|
|
|
|
void
|
|
hard_reset_now(void)
|
|
{
|
|
/*
|
|
* Don't declare this variable elsewhere. We don't want any other
|
|
* code to know about it than the watchdog handler in entry.S and
|
|
* this code, implementing hard reset through the watchdog.
|
|
*/
|
|
#if defined(CONFIG_ETRAX_WATCHDOG)
|
|
extern int cause_of_death;
|
|
#endif
|
|
|
|
printk("*** HARD RESET ***\n");
|
|
local_irq_disable();
|
|
|
|
#if defined(CONFIG_ETRAX_WATCHDOG)
|
|
cause_of_death = 0xbedead;
|
|
#else
|
|
{
|
|
reg_timer_rw_wd_ctrl wd_ctrl = {0};
|
|
|
|
stop_watchdog();
|
|
|
|
wd_ctrl.key = 16; /* Arbitrary key. */
|
|
wd_ctrl.cnt = 1; /* Minimum time. */
|
|
wd_ctrl.cmd = regk_timer_start;
|
|
|
|
arch_enable_nmi();
|
|
REG_WR(timer, regi_timer0, rw_wd_ctrl, wd_ctrl);
|
|
}
|
|
#endif
|
|
|
|
while (1)
|
|
; /* Wait for reset. */
|
|
}
|
|
|
|
/*
|
|
* Return saved PC of a blocked thread.
|
|
*/
|
|
unsigned long thread_saved_pc(struct task_struct *t)
|
|
{
|
|
return task_pt_regs(t)->erp;
|
|
}
|
|
|
|
/*
|
|
* Setup the child's kernel stack with a pt_regs and call switch_stack() on it.
|
|
* It will be unnested during _resume and _ret_from_sys_call when the new thread
|
|
* is scheduled.
|
|
*
|
|
* Also setup the thread switching structure which is used to keep
|
|
* thread-specific data during _resumes.
|
|
*/
|
|
|
|
extern asmlinkage void ret_from_fork(void);
|
|
extern asmlinkage void ret_from_kernel_thread(void);
|
|
|
|
int
|
|
copy_thread(unsigned long clone_flags, unsigned long usp,
|
|
unsigned long arg, struct task_struct *p)
|
|
{
|
|
struct pt_regs *childregs = task_pt_regs(p);
|
|
struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1;
|
|
|
|
/*
|
|
* Put the pt_regs structure at the end of the new kernel stack page and
|
|
* fix it up. Note: the task_struct doubles as the kernel stack for the
|
|
* task.
|
|
*/
|
|
if (unlikely(p->flags & PF_KTHREAD)) {
|
|
memset(swstack, 0,
|
|
sizeof(struct switch_stack) + sizeof(struct pt_regs));
|
|
swstack->r1 = usp;
|
|
swstack->r2 = arg;
|
|
childregs->ccs = 1 << (I_CCS_BITNR + CCS_SHIFT);
|
|
swstack->return_ip = (unsigned long) ret_from_kernel_thread;
|
|
p->thread.ksp = (unsigned long) swstack;
|
|
p->thread.usp = 0;
|
|
return 0;
|
|
}
|
|
*childregs = *current_pt_regs(); /* Struct copy of pt_regs. */
|
|
childregs->r10 = 0; /* Child returns 0 after a fork/clone. */
|
|
|
|
/* Set a new TLS ?
|
|
* The TLS is in $mof because it is the 5th argument to sys_clone.
|
|
*/
|
|
if (p->mm && (clone_flags & CLONE_SETTLS)) {
|
|
task_thread_info(p)->tls = childregs->mof;
|
|
}
|
|
|
|
/* Put the switch stack right below the pt_regs. */
|
|
|
|
/* Parameter to ret_from_sys_call. 0 is don't restart the syscall. */
|
|
swstack->r9 = 0;
|
|
|
|
/*
|
|
* We want to return into ret_from_sys_call after the _resume.
|
|
* ret_from_fork will call ret_from_sys_call.
|
|
*/
|
|
swstack->return_ip = (unsigned long) ret_from_fork;
|
|
|
|
/* Fix the user-mode and kernel-mode stackpointer. */
|
|
p->thread.usp = usp ?: rdusp();
|
|
p->thread.ksp = (unsigned long) swstack;
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long
|
|
get_wchan(struct task_struct *p)
|
|
{
|
|
/* TODO */
|
|
return 0;
|
|
}
|
|
#undef last_sched
|
|
#undef first_sched
|
|
|
|
void show_regs(struct pt_regs * regs)
|
|
{
|
|
unsigned long usp = rdusp();
|
|
|
|
show_regs_print_info(KERN_DEFAULT);
|
|
|
|
printk("ERP: %08lx SRP: %08lx CCS: %08lx USP: %08lx MOF: %08lx\n",
|
|
regs->erp, regs->srp, regs->ccs, usp, regs->mof);
|
|
|
|
printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n",
|
|
regs->r0, regs->r1, regs->r2, regs->r3);
|
|
|
|
printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
|
|
regs->r4, regs->r5, regs->r6, regs->r7);
|
|
|
|
printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
|
|
regs->r8, regs->r9, regs->r10, regs->r11);
|
|
|
|
printk("r12: %08lx r13: %08lx oR10: %08lx\n",
|
|
regs->r12, regs->r13, regs->orig_r10);
|
|
}
|