diff options
Diffstat (limited to 'arch/c6x/kernel/process.c')
| -rw-r--r-- | arch/c6x/kernel/process.c | 137 |
1 files changed, 15 insertions, 122 deletions
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c index 7ca8c41b03c..57d2ea8d197 100644 --- a/arch/c6x/kernel/process.c +++ b/arch/c6x/kernel/process.c @@ -25,22 +25,7 @@ void (*c6x_restart)(void); void (*c6x_halt)(void); extern asmlinkage void ret_from_fork(void); - -static struct signal_struct init_signals = INIT_SIGNALS(init_signals); -static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); - -/* - * Initial thread structure. - */ -union thread_union init_thread_union __init_task_data = { - INIT_THREAD_INFO(init_task) -}; - -/* - * Initial task structure. - */ -struct task_struct init_task = INIT_TASK(init_task); -EXPORT_SYMBOL(init_task); +extern asmlinkage void ret_from_kernel_thread(void); /* * power off function, if any @@ -48,7 +33,7 @@ EXPORT_SYMBOL(init_task); void (*pm_power_off)(void); EXPORT_SYMBOL(pm_power_off); -static void c6x_idle(void) +void arch_cpu_idle(void) { unsigned long tmp; @@ -64,32 +49,6 @@ static void c6x_idle(void) : "=b"(tmp)); } -/* - * The idle loop for C64x - */ -void cpu_idle(void) -{ - /* endless idle loop with no priority at all */ - while (1) { - tick_nohz_idle_enter(); - rcu_idle_enter(); - while (1) { - local_irq_disable(); - if (need_resched()) { - local_irq_enable(); - break; - } - c6x_idle(); /* enables local irqs */ - } - rcu_idle_exit(); - tick_nohz_idle_exit(); - - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - } -} - static void halt_loop(void) { printk(KERN_EMERG "System Halted, OK to turn off power\n"); @@ -119,37 +78,6 @@ void machine_power_off(void) halt_loop(); } -static void kernel_thread_helper(int dummy, void *arg, int (*fn)(void *)) -{ - do_exit(fn(arg)); -} - -/* - * Create a kernel thread - */ -int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) -{ - struct pt_regs regs; - - /* - * copy_thread sets a4 to zero (child return from fork) - * so we can't just set things up to directly return to - * fn. - */ - memset(®s, 0, sizeof(regs)); - regs.b4 = (unsigned long) arg; - regs.a6 = (unsigned long) fn; - regs.pc = (unsigned long) kernel_thread_helper; - local_save_flags(regs.csr); - regs.csr |= 1; - regs.tsr = 5; /* Set GEE and GIE in TSR */ - - /* Ok, create the new process.. */ - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, -1, ®s, - 0, NULL, NULL); -} -EXPORT_SYMBOL(kernel_thread); - void flush_thread(void) { } @@ -158,22 +86,6 @@ void exit_thread(void) { } -SYSCALL_DEFINE1(c6x_clone, struct pt_regs *, regs) -{ - unsigned long clone_flags; - unsigned long newsp; - - /* syscall puts clone_flags in A4 and usp in B4 */ - clone_flags = regs->orig_a4; - if (regs->b4) - newsp = regs->b4; - else - newsp = regs->sp; - - return do_fork(clone_flags, newsp, regs, 0, (int __user *)regs->a6, - (int __user *)regs->b6); -} - /* * Do necessary setup to start up a newly executed thread. */ @@ -201,28 +113,31 @@ void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp) */ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long ustk_size, - struct task_struct *p, struct pt_regs *regs) + struct task_struct *p) { struct pt_regs *childregs; childregs = task_pt_regs(p); - *childregs = *regs; - childregs->a4 = 0; - - if (usp == -1) + if (unlikely(p->flags & PF_KTHREAD)) { /* case of __kernel_thread: we return to supervisor space */ + memset(childregs, 0, sizeof(struct pt_regs)); childregs->sp = (unsigned long)(childregs + 1); - else + p->thread.pc = (unsigned long) ret_from_kernel_thread; + childregs->a0 = usp; /* function */ + childregs->a1 = ustk_size; /* argument */ + } else { /* Otherwise use the given stack */ - childregs->sp = usp; + *childregs = *current_pt_regs(); + if (usp) + childregs->sp = usp; + p->thread.pc = (unsigned long) ret_from_fork; + } /* Set usp/ksp */ p->thread.usp = childregs->sp; - /* switch_to uses stack to save/restore 14 callee-saved regs */ thread_saved_ksp(p) = (unsigned long)childregs - 8; - p->thread.pc = (unsigned int) ret_from_fork; - p->thread.wchan = (unsigned long) ret_from_fork; + p->thread.wchan = p->thread.pc; #ifdef __DSBT__ { unsigned long dp; @@ -237,28 +152,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, return 0; } -/* - * c6x_execve() executes a new program. - */ -SYSCALL_DEFINE4(c6x_execve, const char __user *, name, - const char __user *const __user *, argv, - const char __user *const __user *, envp, - struct pt_regs *, regs) -{ - int error; - char *filename; - - filename = getname(name); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - - error = do_execve(filename, argv, envp, regs); - putname(filename); -out: - return error; -} - unsigned long get_wchan(struct task_struct *p) { return p->thread.wchan; |