*/
#include <linux/config.h>
+#include <linux/compiler.h>
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/irq.h>
-#if defined(CONFIG_VIRT_TIMER) || defined (CONFIG_NO_IDLE_HZ)
#include <asm/timer.h>
-#endif
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
*/
unsigned long thread_saved_pc(struct task_struct *tsk)
{
- unsigned long bc;
+ struct stack_frame *sf;
- bc = *((unsigned long *) tsk->thread.ksp);
-#ifndef CONFIG_ARCH_S390X
- return *((unsigned long *) (bc+56));
-#else
- return *((unsigned long *) (bc+112));
-#endif
+ sf = (struct stack_frame *) tsk->thread.ksp;
+ sf = (struct stack_frame *) sf->back_chain;
+ return sf->gprs[8];
}
/*
- * The idle loop on a S390...
+ * Need to know about CPUs going idle?
*/
+static struct notifier_block *idle_chain;
+
+int register_idle_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_register(&idle_chain, nb);
+}
+EXPORT_SYMBOL(register_idle_notifier);
+
+int unregister_idle_notifier(struct notifier_block *nb)
+{
+ return notifier_chain_unregister(&idle_chain, nb);
+}
+EXPORT_SYMBOL(unregister_idle_notifier);
+void do_monitor_call(struct pt_regs *regs, long interruption_code)
+{
+ /* disable monitor call class 0 */
+ __ctl_clear_bit(8, 15);
+
+ notifier_call_chain(&idle_chain, CPU_NOT_IDLE,
+ (void *)(long) smp_processor_id());
+}
+
+/*
+ * The idle loop on a S390...
+ */
void default_idle(void)
{
psw_t wait_psw;
unsigned long reg;
+ int cpu, rc;
local_irq_disable();
if (need_resched()) {
return;
}
-#if defined(CONFIG_VIRT_TIMER) || defined (CONFIG_NO_IDLE_HZ)
- /*
- * hook to stop timers that should not tick while CPU is idle
- */
- if (stop_timers()) {
+ /* CPU is going idle. */
+ cpu = smp_processor_id();
+ rc = notifier_call_chain(&idle_chain, CPU_IDLE, (void *)(long) cpu);
+ if (rc != NOTIFY_OK && rc != NOTIFY_DONE)
+ BUG();
+ if (rc != NOTIFY_OK) {
local_irq_enable();
return;
}
+
+ /* enable monitor call class 0 */
+ __ctl_set_bit(8, 15);
+
+#ifdef CONFIG_HOTPLUG_CPU
+ if (cpu_is_offline(smp_processor_id()))
+ cpu_die();
#endif
/*
#endif /* CONFIG_ARCH_S390X */
}
-int cpu_idle(void)
+void cpu_idle(void)
{
for (;;)
default_idle();
- return 0;
}
void show_regs(struct pt_regs *regs)
extern void kernel_thread_starter(void);
-#ifndef CONFIG_ARCH_S390X
-
-__asm__(".align 4\n"
- "kernel_thread_starter:\n"
- " l 15,0(8)\n"
- " sr 15,7\n"
- " stosm 24(15),3\n"
- " lr 2,10\n"
- " basr 14,9\n"
- " sr 2,2\n"
- " br 11\n");
-
-#else /* CONFIG_ARCH_S390X */
-
__asm__(".align 4\n"
"kernel_thread_starter:\n"
- " lg 15,0(8)\n"
- " sgr 15,7\n"
- " stosm 48(15),3\n"
- " lgr 2,10\n"
+ " la 2,0(10)\n"
" basr 14,9\n"
- " sgr 2,2\n"
+ " la 2,0\n"
" br 11\n");
-#endif /* CONFIG_ARCH_S390X */
-
int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
{
struct pt_regs regs;
memset(®s, 0, sizeof(regs));
- regs.psw.mask = PSW_KERNEL_BITS;
+ regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) kernel_thread_starter | PSW_ADDR_AMODE;
- regs.gprs[7] = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
- regs.gprs[8] = __LC_KERNEL_STACK;
regs.gprs[9] = (unsigned long) fn;
regs.gprs[10] = (unsigned long) arg;
regs.gprs[11] = (unsigned long) do_exit;
void flush_thread(void)
{
-
- current->used_math = 0;
+ clear_used_math();
clear_tsk_thread_flag(current, TIF_USEDFPU);
}
unsigned long unused,
struct task_struct * p, struct pt_regs * regs)
{
- struct stack_frame
+ struct fake_frame
{
- unsigned long back_chain;
- unsigned long eos;
- unsigned long glue1;
- unsigned long glue2;
- unsigned long scratch[2];
- unsigned long gprs[10]; /* gprs 6 -15 */
- unsigned int fprs[4]; /* fpr 4 and 6 */
- unsigned int empty[4];
+ struct stack_frame sf;
struct pt_regs childregs;
} *frame;
- frame = ((struct stack_frame *)
+ frame = ((struct fake_frame *)
(THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
p->thread.ksp = (unsigned long) frame;
- p->set_child_tid = p->clear_child_tid = NULL;
/* Store access registers to kernel stack of new process. */
frame->childregs = *regs;
frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */
frame->childregs.gprs[15] = new_stackp;
- frame->back_chain = frame->eos = 0;
+ frame->sf.back_chain = 0;
/* new return point is ret_from_fork */
- frame->gprs[8] = (unsigned long) ret_from_fork;
+ frame->sf.gprs[8] = (unsigned long) ret_from_fork;
/* fake return stack for resume(), don't go back to schedule */
- frame->gprs[9] = (unsigned long) frame;
+ frame->sf.gprs[9] = (unsigned long) frame;
/* Save access registers to new thread structure. */
save_access_regs(&p->thread.acrs[0]);
{
unsigned long clone_flags;
unsigned long newsp;
- int *parent_tidptr, *child_tidptr;
+ int __user *parent_tidptr, *child_tidptr;
clone_flags = regs.gprs[3];
newsp = regs.orig_gpr2;
- parent_tidptr = (int *) regs.gprs[4];
- child_tidptr = (int *) regs.gprs[5];
+ parent_tidptr = (int __user *) regs.gprs[4];
+ child_tidptr = (int __user *) regs.gprs[5];
if (!newsp)
newsp = regs.gprs[15];
- return do_fork(clone_flags & ~CLONE_IDLETASK, newsp, ®s, 0,
+ return do_fork(clone_flags, newsp, ®s, 0,
parent_tidptr, child_tidptr);
}
int error;
char * filename;
- filename = getname((char *) regs.orig_gpr2);
+ filename = getname((char __user *) regs.orig_gpr2);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
- error = do_execve(filename, (char **) regs.gprs[3],
- (char **) regs.gprs[4], ®s);
+ error = do_execve(filename, (char __user * __user *) regs.gprs[3],
+ (char __user * __user *) regs.gprs[4], ®s);
if (error == 0) {
+ task_lock(current);
current->ptrace &= ~PT_DTRACE;
+ task_unlock(current);
current->thread.fp_regs.fpc = 0;
if (MACHINE_HAS_IEEE)
asm volatile("sfpc %0,%0" : : "d" (0));
dump->regs.per_info = current->thread.per_info;
}
-/*
- * These bracket the sleeping functions..
- */
-#define first_sched ((unsigned long) scheduling_functions_start_here)
-#define last_sched ((unsigned long) scheduling_functions_end_here)
-
unsigned long get_wchan(struct task_struct *p)
{
- unsigned long r14, r15, bc;
- unsigned long stack_page;
- int count = 0;
- if (!p || p == current || p->state == TASK_RUNNING)
+ struct stack_frame *sf, *low, *high;
+ unsigned long return_address;
+ int count;
+
+ if (!p || p == current || p->state == TASK_RUNNING || !p->thread_info)
return 0;
- stack_page = (unsigned long) p->thread_info;
- r15 = p->thread.ksp;
- if (!stack_page || r15 < stack_page ||
- r15 >= THREAD_SIZE - sizeof(unsigned long) + stack_page)
+ low = (struct stack_frame *) p->thread_info;
+ high = (struct stack_frame *)
+ ((unsigned long) p->thread_info + THREAD_SIZE) - 1;
+ sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
return 0;
- bc = (*(unsigned long *) r15) & PSW_ADDR_INSN;
- do {
- if (bc < stack_page ||
- bc >= THREAD_SIZE - sizeof(unsigned long) + stack_page)
+ for (count = 0; count < 16; count++) {
+ sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN);
+ if (sf <= low || sf > high)
return 0;
-#ifndef CONFIG_ARCH_S390X
- r14 = (*(unsigned long *) (bc+56)) & PSW_ADDR_INSN;
-#else
- r14 = *(unsigned long *) (bc+112);
-#endif
- if (r14 < first_sched || r14 >= last_sched)
- return r14;
- bc = (*(unsigned long *) bc) & PSW_ADDR_INSN;
- } while (count++ < 16);
+ return_address = sf->gprs[8] & PSW_ADDR_INSN;
+ if (!in_sched_functions(return_address))
+ return return_address;
+ }
return 0;
}
-#undef last_sched
-#undef first_sched
git://git.onelab.eu / linux-2.6.git / blobdiff