void elf_set_personality(const struct elf32_hdr *x)
{
unsigned int eflags = x->e_flags;
unsigned int personality = PER_LINUX_32BIT;
/*
* APCS-26 is only valid for OABI executables
*/
if ((eflags & EF_ARM_EABI_MASK) == EF_ARM_EABI_UNKNOWN) {
if (eflags & EF_ARM_APCS_26)
personality = PER_LINUX;
}
set_personality(personality);
/*
* Since the FPA coprocessor uses CP1 and CP2, and iWMMXt uses CP0
* and CP1, we only enable access to the iWMMXt coprocessor if the
* binary is EABI or softfloat (and thus, guaranteed not to use
* FPA instructions.)
*/
if (elf_hwcap & HWCAP_IWMMXT &&
eflags & (EF_ARM_EABI_MASK | EF_ARM_SOFT_FLOAT)) {
set_thread_flag(TIF_USING_IWMMXT);
} else {
clear_thread_flag(TIF_USING_IWMMXT);
}
}
static void iseries_dedicated_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
tick_nohz_stop_sched_tick();
if (!need_resched()) {
while (!need_resched()) {
ppc64_runlatch_off();
HMT_low();
if (hvlpevent_is_pending()) {
HMT_medium();
ppc64_runlatch_on();
process_iSeries_events();
}
}
HMT_medium();
}
ppc64_runlatch_on();
tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
asmlinkage int sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
compat_sigset_t __user *unewset;
compat_sigset_t uset;
size_t sigsetsize;
sigset_t newset;
/* XXX Don't preclude handling different sized sigset_t's. */
sigsetsize = regs.regs[5];
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
unewset = (compat_sigset_t __user *) regs.regs[4];
if (copy_from_user(&uset, unewset, sizeof(uset)))
return -EFAULT;
sigset_from_compat(&newset, &uset);
sigdelsetmask(&newset, ~_BLOCKABLE);
current->saved_sigmask = current->blocked;
set_current_blocked(&newset);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
unsigned long in_purr;
ktime_t kt_before;
int cpu = dev->cpu;
idle_loop_prolog(&in_purr, &kt_before);
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while ((!need_resched()) && cpu_online(cpu)) {
ppc64_runlatch_off();
HMT_low();
HMT_very_low();
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
dev->last_residency =
(int)idle_loop_epilog(in_purr, kt_before);
return index;
}
/**
* prctl_set_seccomp: configures current->seccomp.mode
* @seccomp_mode: requested mode to use
* @filter: optional struct sock_fprog for use with SECCOMP_MODE_FILTER
*
* This function may be called repeatedly with a @seccomp_mode of
* SECCOMP_MODE_FILTER to install additional filters. Every filter
* successfully installed will be evaluated (in reverse order) for each system
* call the task makes.
*
* Once current->seccomp.mode is non-zero, it may not be changed.
*
* Returns 0 on success or -EINVAL on failure.
*/
long prctl_set_seccomp(unsigned long seccomp_mode, char __user *filter)
{
long ret = -EINVAL;
if (current->seccomp.mode &&
current->seccomp.mode != seccomp_mode)
goto out;
switch (seccomp_mode) {
case SECCOMP_MODE_STRICT:
ret = 0;
#ifdef TIF_NOTSC
disable_TSC();
#endif
break;
#ifdef CONFIG_SECCOMP_FILTER
case SECCOMP_MODE_FILTER:
ret = seccomp_attach_user_filter(filter);
if (ret)
goto out;
break;
#endif
default:
goto out;
}
current->seccomp.mode = seccomp_mode;
set_thread_flag(TIF_SECCOMP);
out:
return ret;
}
asmlinkage int
do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize,
struct pt_regs *regs, struct switch_stack *sw)
{
sigset_t set;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&set, uset, sizeof(set)))
return -EFAULT;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
current->saved_sigmask = current->blocked;
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
/* Indicate EINTR on return from any possible signal handler,
which will not come back through here, but via sigreturn. */
regs->r0 = EINTR;
regs->r19 = 1;
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
asmlinkage int sys_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
sigset_t newset;
sigset_t __user *unewset;
size_t sigsetsize;
/* XXX Don't preclude handling different sized sigset_t's. */
sigsetsize = regs.regs[5];
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
unewset = (sigset_t __user *) regs.regs[4];
if (copy_from_user(&newset, unewset, sizeof(newset)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
current->saved_sigmask = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7, unsigned long r8,
struct pt_regs *regs)
{
struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
sigset_t set;
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
goto badframe;
if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
goto badframe;
restore_sigmask(&set);
if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
goto badframe;
/* do_sigaltstack expects a __user pointer and won't modify
* what's in there anyway
*/
do_sigaltstack(&uc->uc_stack, NULL, regs->gpr[1]);
set_thread_flag(TIF_RESTOREALL);
return 0;
badframe:
#if DEBUG_SIG
printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
regs, uc, &uc->uc_mcontext);
#endif
force_sig(SIGSEGV, current);
return 0;
}
long prctl_set_seccomp(unsigned long seccomp_mode)
{
long ret;
/* can set it only once to be even more secure */
ret = -EPERM;
if (unlikely(current->seccomp.mode))
goto out;
ret = 0;
switch (seccomp_mode) {
case 1:
#ifdef TIF_NOTSC
disable_TSC();
#endif
#ifdef CONFIG_SECCOMP_FILTER
case 13:
#endif
current->seccomp.mode = seccomp_mode;
set_thread_flag(TIF_SECCOMP);
break;
default:
ret = -EINVAL;
}
out:
return ret;
}
void fpsimd_flush_thread(void)
{
preempt_disable();
memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
set_thread_flag(TIF_FOREIGN_FPSTATE);
preempt_enable();
}
int check_hw_breakpoint(struct pt_regs *regs)
{
if (regs->debugcause & BIT(DEBUGCAUSE_IBREAK_BIT)) {
int i;
struct perf_event **bp = this_cpu_ptr(bp_on_reg);
for (i = 0; i < XCHAL_NUM_IBREAK; ++i) {
if (bp[i] && !bp[i]->attr.disabled &&
regs->pc == bp[i]->attr.bp_addr)
perf_bp_event(bp[i], regs);
}
return 0;
} else if (regs->debugcause & BIT(DEBUGCAUSE_DBREAK_BIT)) {
struct perf_event **bp = this_cpu_ptr(wp_on_reg);
int dbnum = (regs->debugcause & DEBUGCAUSE_DBNUM_MASK) >>
DEBUGCAUSE_DBNUM_SHIFT;
if (dbnum < XCHAL_NUM_DBREAK && bp[dbnum]) {
if (user_mode(regs)) {
perf_bp_event(bp[dbnum], regs);
} else {
set_thread_flag(TIF_DB_DISABLED);
xtensa_wsr(0, SREG_DBREAKC + dbnum);
}
} else {
WARN_ONCE(1,
"Wrong/unconfigured DBNUM reported in DEBUGCAUSE: %d\n",
dbnum);
}
return 0;
}
return -ENOENT;
}
/*
* this changes the io permissions bitmap in the current task.
*/
asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
{
struct thread_struct *t = ¤t->thread;
struct physdev_set_iobitmap set_iobitmap;
if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
return -EINVAL;
if (turn_on && !capable(CAP_SYS_RAWIO))
return -EPERM;
/*
* If it's the first ioperm() call in this thread's lifetime, set the
* IO bitmap up. ioperm() is much less timing critical than clone(),
* this is why we delay this operation until now:
*/
if (!t->io_bitmap_ptr) {
unsigned long *bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
if (!bitmap)
return -ENOMEM;
memset(bitmap, 0xff, IO_BITMAP_BYTES);
t->io_bitmap_ptr = bitmap;
set_thread_flag(TIF_IO_BITMAP);
set_xen_guest_handle(set_iobitmap.bitmap, (char *)bitmap);
set_iobitmap.nr_ports = IO_BITMAP_BITS;
WARN_ON(HYPERVISOR_physdev_op(PHYSDEVOP_set_iobitmap,
&set_iobitmap));
}
set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
return 0;
}
/*
* The body of the idle task.
*/
void cpu_idle(void)
{
if (ppc_md.idle_loop)
ppc_md.idle_loop(); /* doesn't return */
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
tick_nohz_stop_sched_tick();
while (!need_resched() && !cpu_should_die()) {
ppc64_runlatch_off();
if (ppc_md.power_save) {
clear_thread_flag(TIF_POLLING_NRFLAG);
/*
* smp_mb is so clearing of TIF_POLLING_NRFLAG
* is ordered w.r.t. need_resched() test.
*/
smp_mb();
local_irq_disable();
/* check again after disabling irqs */
if (!need_resched() && !cpu_should_die())
ppc_md.power_save();
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
}
}
HMT_medium();
ppc64_runlatch_on();
tick_nohz_restart_sched_tick();
if (cpu_should_die())
cpu_die();
preempt_enable_no_resched();
schedule();
preempt_disable();
}
}
/*
* this changes the io permissions bitmap in the current task.
*/
asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
{
unsigned int i, max_long, bytes, bytes_updated;
struct thread_struct * t = ¤t->thread;
struct tss_struct * tss;
unsigned long *bitmap;
if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
return -EINVAL;
if (turn_on && !capable(CAP_SYS_RAWIO))
return -EPERM;
/*
* If it's the first ioperm() call in this thread's lifetime, set the
* IO bitmap up. ioperm() is much less timing critical than clone(),
* this is why we delay this operation until now:
*/
if (!t->io_bitmap_ptr) {
bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
if (!bitmap)
return -ENOMEM;
memset(bitmap, 0xff, IO_BITMAP_BYTES);
t->io_bitmap_ptr = bitmap;
set_thread_flag(TIF_IO_BITMAP);
}
/*
* do it in the per-thread copy and in the TSS ...
*
* Disable preemption via get_cpu() - we must not switch away
* because the ->io_bitmap_max value must match the bitmap
* contents:
*/
tss = &per_cpu(init_tss, get_cpu());
set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
/*
* Search for a (possibly new) maximum. This is simple and stupid,
* to keep it obviously correct:
*/
max_long = 0;
for (i = 0; i < IO_BITMAP_LONGS; i++)
if (t->io_bitmap_ptr[i] != ~0UL)
max_long = i;
bytes = (max_long + 1) * sizeof(long);
bytes_updated = max(bytes, t->io_bitmap_max);
t->io_bitmap_max = bytes;
/* Update the TSS: */
memcpy(tss->io_bitmap, t->io_bitmap_ptr, bytes_updated);
put_cpu();
return 0;
}
asmlinkage long compat_sys_rt_sigaction(int sig,
struct sigaction32 __user *act,
struct sigaction32 __user *oact,
void __user *restorer,
compat_size_t sigsetsize)
{
struct k_sigaction new_ka, old_ka;
int ret;
compat_sigset_t set32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
/* All tasks which use RT signals (effectively) use
* new style signals.
*/
set_thread_flag(TIF_NEWSIGNALS);
if (act) {
u32 u_handler, u_restorer;
new_ka.ka_restorer = restorer;
ret = get_user(u_handler, &act->sa_handler);
new_ka.sa.sa_handler = compat_ptr(u_handler);
ret |= __copy_from_user(&set32, &act->sa_mask, sizeof(compat_sigset_t));
switch (_NSIG_WORDS) {
case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6] | (((long)set32.sig[7]) << 32);
case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4] | (((long)set32.sig[5]) << 32);
case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2] | (((long)set32.sig[3]) << 32);
case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0] | (((long)set32.sig[1]) << 32);
}
ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
ret |= __get_user(u_restorer, &act->sa_restorer);
new_ka.sa.sa_restorer = compat_ptr(u_restorer);
if (ret)
return -EFAULT;
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
switch (_NSIG_WORDS) {
case 4: set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32); set32.sig[6] = old_ka.sa.sa_mask.sig[3];
case 3: set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32); set32.sig[4] = old_ka.sa.sa_mask.sig[2];
case 2: set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32); set32.sig[2] = old_ka.sa.sa_mask.sig[1];
case 1: set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32); set32.sig[0] = old_ka.sa.sa_mask.sig[0];
}
ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
ret |= __copy_to_user(&oact->sa_mask, &set32, sizeof(compat_sigset_t));
ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
if (ret)
ret = -EFAULT;
}
return ret;
}
void start_kernel_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
{
set_fs(KERNEL_DS);
regs->pc = pc;
regs->r1 = usp;
regs->pt_mode = 0;
regs->msr &= ~MSR_UMS;
set_thread_flag(TIF_KU);
}
int sys_rt_sigreturn(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7, unsigned long r8,
struct pt_regs *regs)
{
struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
sigset_t set;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
unsigned long msr;
#endif
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
if (!access_ok(VERIFY_READ, uc, sizeof(*uc)))
goto badframe;
if (__copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
goto badframe;
set_current_blocked(&set);
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
goto badframe;
if (MSR_TM_ACTIVE(msr)) {
/* We recheckpoint on return. */
struct ucontext __user *uc_transact;
if (__get_user(uc_transact, &uc->uc_link))
goto badframe;
if (restore_tm_sigcontexts(regs, &uc->uc_mcontext,
&uc_transact->uc_mcontext))
goto badframe;
}
else
/* Fall through, for non-TM restore */
#endif
if (restore_sigcontext(regs, NULL, 1, &uc->uc_mcontext))
goto badframe;
if (restore_altstack(&uc->uc_stack))
goto badframe;
set_thread_flag(TIF_RESTOREALL);
return 0;
badframe:
#if DEBUG_SIG
printk("badframe in sys_rt_sigreturn, regs=%p uc=%p &uc->uc_mcontext=%p\n",
regs, uc, &uc->uc_mcontext);
#endif
if (show_unhandled_signals)
printk_ratelimited(regs->msr & MSR_64BIT ? fmt64 : fmt32,
current->comm, current->pid, "rt_sigreturn",
(long)uc, regs->nip, regs->link);
force_sig(SIGSEGV, current);
return 0;
}
void fpsimd_flush_thread(void)
{
if (!system_supports_fpsimd())
return;
preempt_disable();
memset(¤t->thread.fpsimd_state, 0, sizeof(struct fpsimd_state));
fpsimd_flush_task_state(current);
set_thread_flag(TIF_FOREIGN_FPSTATE);
preempt_enable();
}
static int pseries_dedicated_idle(void)
{
long oldval;
struct paca_struct *lpaca = get_paca();
unsigned int cpu = smp_processor_id();
unsigned long start_snooze;
unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
while (1) {
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
lpaca->lppaca.idle = 1;
oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
if (!oldval) {
set_thread_flag(TIF_POLLING_NRFLAG);
start_snooze = __get_tb() +
*smt_snooze_delay * tb_ticks_per_usec;
while (!need_resched() && !cpu_is_offline(cpu)) {
ppc64_runlatch_off();
/*
* Go into low thread priority and possibly
* low power mode.
*/
HMT_low();
HMT_very_low();
if (*smt_snooze_delay != 0 &&
__get_tb() > start_snooze) {
HMT_medium();
dedicated_idle_sleep(cpu);
}
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
} else {
set_need_resched();
}
lpaca->lppaca.idle = 0;
ppc64_runlatch_on();
schedule();
if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
cpu_die();
}
}
void
cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
while (!need_resched())
cpu_relax();
schedule();
}
}
int main()
{
initialize_flag();
pthread_t thread_id;
pthread_create(&thread_id, NULL, &thread_function, NULL);
printf("flag not set...\n");
sleep(5);
set_thread_flag(1);
printf("flag alredey set...\n");
pthread_join(thread_id, NULL);
return 0;
}
int vmadump_restore_cpu(cr_rstrt_proc_req_t *ctx, struct file *file,
struct pt_regs *regs) {
struct pt_regs regtmp;
int r;
r = read_kern(ctx, file, ®tmp, sizeof(regtmp));
if (r != sizeof(regtmp)) goto bad_read;
/* Don't restore machine state register since this is
* unpriviledged user space stuff we're restoring. */
if (regtmp.msr & MSR_SF) {
regtmp.msr = MSR_USER64;
clear_thread_flag(TIF_32BIT);
} else {
regtmp.msr = MSR_USER32;
set_thread_flag(TIF_32BIT);
}
memcpy(regs, ®tmp, sizeof(regtmp));
/* Floating point regs */
r = read_kern(ctx, file, ¤t->thread.fpr,
sizeof(current->thread.fpr));
if (r != sizeof(current->thread.fpr)) goto bad_read;
r = read_kern(ctx, file, ¤t->thread.fpscr,
sizeof(current->thread.fpscr));
if (r != sizeof(current->thread.fpscr)) goto bad_read;
#if HAVE_THREAD_VDSO_BASE
/* unconditonally restore this */
r = read_kern(ctx, file, ¤t->thread.vdso_base,
sizeof(current->thread.vdso_base));
if (r != sizeof(current->thread.vdso_base)) goto bad_read;
#endif
#ifdef CONFIG_ALTIVEC
/* Restore Altivec */
r = read_kern(ctx, file, ¤t->thread.vr,
sizeof(current->thread.vr));
if (r != sizeof(current->thread.vr)) goto bad_read;
r = read_kern(ctx, file, ¤t->thread.vscr,
sizeof(current->thread.vscr));
if (r != sizeof(current->thread.vscr)) goto bad_read;
#endif
current->thread.regs = regs;
return 0;
bad_read:
if (r >= 0) r = -EIO;
return r;
}
/*
* 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)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
while (!need_resched())
barrier();
<<<<<<< HEAD
schedule_preempt_disabled();
=======
<<<<<<< HEAD
long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
sigset_t blocked;
mask &= _BLOCKABLE;
siginitset(&blocked, mask);
set_current_blocked(&blocked);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
static void pseries_dedicated_idle_sleep(void)
{
unsigned int cpu = smp_processor_id();
unsigned long start_snooze;
unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
unsigned long in_purr, out_purr;
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca()->idle = 1;
get_lppaca()->cpuctls_task_attrs = 1;
in_purr = mfspr(SPRN_PURR);
/*
* We come in with interrupts disabled, and need_resched()
* has been checked recently. If we should poll for a little
* while, do so.
*/
if (*smt_snooze_delay) {
start_snooze = get_tb() +
*smt_snooze_delay * tb_ticks_per_usec;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while (get_tb() < start_snooze) {
if (need_resched() || cpu_is_offline(cpu))
goto out;
ppc64_runlatch_off();
HMT_low();
HMT_very_low();
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
local_irq_disable();
if (need_resched() || cpu_is_offline(cpu))
goto out;
}
cede_processor();
out:
HMT_medium();
get_lppaca()->cpuctls_task_attrs = 0;
out_purr = mfspr(SPRN_PURR);
get_lppaca()->wait_state_cycles += out_purr - in_purr;
get_lppaca()->idle = 0;
}
/*
* 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)
{
set_thread_flag(TIF_POLLING_NRFLAG);
/* endless idle loop with no priority at all */
while (1) {
while (!need_resched())
barrier();
preempt_enable_no_resched();
schedule();
preempt_disable();
check_pgt_cache();
}
}
/*
* Atomically swap in the new signal mask, and wait for a signal. Define
* dummy arguments to be able to reach the regs argument. (Note that this
* arrangement relies on old_sigset_t occupying one register.)
*/
int sys_sigsuspend(old_sigset_t mask, long r11, long r12, long r13, long mof,
long srp, struct pt_regs *regs)
{
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
current->saved_sigmask = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
/*
* Atomically swap in the new signal mask, and wait for a signal.
*/
long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
current->saved_sigmask = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
static long _sigpause_common(old_sigset_t set)
{
set &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
current->saved_sigmask = current->blocked;
siginitset(¤t->blocked, set);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
current->state = TASK_INTERRUPTIBLE;
schedule();
set_thread_flag(TIF_RESTORE_SIGMASK);
return -ERESTARTNOHAND;
}
void
cpu_idle(void)
{
set_thread_flag(TIF_POLLING_NRFLAG);
while (1) {
/* FIXME -- EV6 and LCA45 know how to power down
the CPU. */
while (!need_resched())
cpu_relax();
schedule();
}
}
