diff options
Diffstat (limited to 'arch/frv/kernel/process.c')
| -rw-r--r-- | arch/frv/kernel/process.c | 149 |
1 files changed, 26 insertions, 123 deletions
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c index 3901df1213c..5d40aeb7712 100644 --- a/arch/frv/kernel/process.c +++ b/arch/frv/kernel/process.c @@ -25,10 +25,10 @@ #include <linux/reboot.h> #include <linux/interrupt.h> #include <linux/pagemap.h> +#include <linux/rcupdate.h> #include <asm/asm-offsets.h> #include <asm/uaccess.h> -#include <asm/system.h> #include <asm/setup.h> #include <asm/pgtable.h> #include <asm/tlb.h> @@ -38,27 +38,13 @@ #include "local.h" asmlinkage void ret_from_fork(void); +asmlinkage void ret_from_kernel_thread(void); #include <asm/pgalloc.h> void (*pm_power_off)(void); EXPORT_SYMBOL(pm_power_off); -struct task_struct *alloc_task_struct_node(int node) -{ - struct task_struct *p = kmalloc_node(THREAD_SIZE, GFP_KERNEL, node); - - if (p) - atomic_set((atomic_t *)(p+1), 1); - return p; -} - -void free_task_struct(struct task_struct *p) -{ - if (atomic_dec_and_test((atomic_t *)(p+1))) - kfree(p); -} - static void core_sleep_idle(void) { #ifdef LED_DEBUG_SLEEP @@ -73,29 +59,12 @@ static void core_sleep_idle(void) mb(); } -void (*idle)(void) = core_sleep_idle; - -/* - * The idle thread. There's no useful work to be - * done, so just try to conserve power and have a - * low exit latency (ie sit in a loop waiting for - * somebody to say that they'd like to reschedule) - */ -void cpu_idle(void) +void arch_cpu_idle(void) { - /* endless idle loop with no priority at all */ - while (1) { - while (!need_resched()) { - check_pgt_cache(); - - if (!frv_dma_inprogress && idle) - idle(); - } - - preempt_enable_no_resched(); - schedule(); - preempt_disable(); - } + if (!frv_dma_inprogress) + core_sleep_idle(); + else + local_irq_enable(); } void machine_restart(char * __unused) @@ -153,87 +122,40 @@ inline unsigned long user_stack(const struct pt_regs *regs) return user_mode(regs) ? regs->sp : 0; } -asmlinkage int sys_fork(void) -{ -#ifndef CONFIG_MMU - /* fork almost works, enough to trick you into looking elsewhere:-( */ - return -EINVAL; -#else - return do_fork(SIGCHLD, user_stack(__frame), __frame, 0, NULL, NULL); -#endif -} - -asmlinkage int sys_vfork(void) -{ - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, user_stack(__frame), __frame, 0, - NULL, NULL); -} - -/*****************************************************************************/ -/* - * clone a process - * - tlsptr is retrieved by copy_thread() - */ -asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, - int __user *parent_tidptr, int __user *child_tidptr, - int __user *tlsptr) -{ - if (!newsp) - newsp = user_stack(__frame); - return do_fork(clone_flags, newsp, __frame, 0, parent_tidptr, child_tidptr); -} /* end sys_clone() */ - -/*****************************************************************************/ -/* - * This gets called before we allocate a new thread and copy - * the current task into it. - */ -void prepare_to_copy(struct task_struct *tsk) -{ - //unlazy_fpu(tsk); -} /* end prepare_to_copy() */ - -/*****************************************************************************/ /* * set up the kernel stack and exception frames for a new process */ int copy_thread(unsigned long clone_flags, - unsigned long usp, unsigned long topstk, - struct task_struct *p, struct pt_regs *regs) + unsigned long usp, unsigned long arg, + struct task_struct *p) { - struct pt_regs *childregs0, *childregs, *regs0; + struct pt_regs *childregs; - regs0 = __kernel_frame0_ptr; - childregs0 = (struct pt_regs *) + childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE - FRV_FRAME0_SIZE); - childregs = childregs0; /* set up the userspace frame (the only place that the USP is stored) */ - *childregs0 = *regs0; - - childregs0->gr8 = 0; - childregs0->sp = usp; - childregs0->next_frame = NULL; - - /* set up the return kernel frame if called from kernel_thread() */ - if (regs != regs0) { - childregs--; - *childregs = *regs; - childregs->sp = (unsigned long) childregs0; - childregs->next_frame = childregs0; - childregs->gr15 = (unsigned long) task_thread_info(p); - childregs->gr29 = (unsigned long) p; - } - - p->set_child_tid = p->clear_child_tid = NULL; + *childregs = *current_pt_regs(); p->thread.frame = childregs; p->thread.curr = p; p->thread.sp = (unsigned long) childregs; p->thread.fp = 0; p->thread.lr = 0; - p->thread.pc = (unsigned long) ret_from_fork; - p->thread.frame0 = childregs0; + p->thread.frame0 = childregs; + + if (unlikely(p->flags & PF_KTHREAD)) { + childregs->gr9 = usp; /* function */ + childregs->gr8 = arg; + p->thread.pc = (unsigned long) ret_from_kernel_thread; + save_user_regs(p->thread.user); + return 0; + } + if (usp) + childregs->sp = usp; + childregs->next_frame = NULL; + + p->thread.pc = (unsigned long) ret_from_fork; /* the new TLS pointer is passed in as arg #5 to sys_clone() */ if (clone_flags & CLONE_SETTLS) @@ -244,25 +166,6 @@ int copy_thread(unsigned long clone_flags, return 0; } /* end copy_thread() */ -/* - * sys_execve() executes a new program. - */ -asmlinkage int sys_execve(const char __user *name, - const char __user *const __user *argv, - const char __user *const __user *envp) -{ - int error; - char * filename; - - filename = getname(name); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - return error; - error = do_execve(filename, argv, envp, __frame); - putname(filename); - return error; -} - unsigned long get_wchan(struct task_struct *p) { struct pt_regs *regs0; |