+ uint64_t abstime;
+ uint32_t mtxspin;
+#if DEVELOPMENT || DEBUG
+ uint64_t default_timeout_ns = NSEC_PER_SEC>>2;
+#else
+ uint64_t default_timeout_ns = NSEC_PER_SEC>>1;
+#endif
+ uint32_t slto;
+ uint32_t prt;
+
+ if (PE_parse_boot_argn("slto_us", &slto, sizeof (slto)))
+ default_timeout_ns = slto * NSEC_PER_USEC;
+
+ /* LockTimeOut is absolutetime, LockTimeOutTSC is in TSC ticks */
+ nanoseconds_to_absolutetime(default_timeout_ns, &abstime);
+ LockTimeOut = (uint32_t) abstime;
+ LockTimeOutTSC = (uint32_t) tmrCvt(abstime, tscFCvtn2t);
+
+ /*
+ * TLBTimeOut dictates the TLB flush timeout period. It defaults to
+ * LockTimeOut but can be overriden separately. In particular, a
+ * zero value inhibits the timeout-panic and cuts a trace evnt instead
+ * - see pmap_flush_tlbs().
+ */
+ if (PE_parse_boot_argn("tlbto_us", &slto, sizeof (slto))) {
+ default_timeout_ns = slto * NSEC_PER_USEC;
+ nanoseconds_to_absolutetime(default_timeout_ns, &abstime);
+ TLBTimeOut = (uint32_t) abstime;
+ } else {
+ TLBTimeOut = LockTimeOut;
+ }
+
+ if (PE_parse_boot_argn("mtxspin", &mtxspin, sizeof (mtxspin))) {
+ if (mtxspin > USEC_PER_SEC>>4)
+ mtxspin = USEC_PER_SEC>>4;
+ nanoseconds_to_absolutetime(mtxspin*NSEC_PER_USEC, &abstime);
+ } else {
+ nanoseconds_to_absolutetime(10*NSEC_PER_USEC, &abstime);
+ }
+ MutexSpin = (unsigned int)abstime;
+
+ nanoseconds_to_absolutetime(4ULL * NSEC_PER_SEC, &LastDebuggerEntryAllowance);
+ if (PE_parse_boot_argn("panic_restart_timeout", &prt, sizeof (prt)))
+ nanoseconds_to_absolutetime(prt * NSEC_PER_SEC, &panic_restart_timeout);
+ virtualized = ((cpuid_features() & CPUID_FEATURE_VMM) != 0);
+ interrupt_latency_tracker_setup();
+ simple_lock_init(&ml_timer_evaluation_slock, 0);
+}
+
+/*
+ * Threshold above which we should attempt to block
+ * instead of spinning for clock_delay_until().
+ */
+
+void
+ml_init_delay_spin_threshold(int threshold_us)
+{
+ nanoseconds_to_absolutetime(threshold_us * NSEC_PER_USEC, &delay_spin_threshold);
+}
+
+boolean_t
+ml_delay_should_spin(uint64_t interval)
+{
+ return (interval < delay_spin_threshold) ? TRUE : FALSE;
+}
+
+/*
+ * This is called from the machine-independent layer
+ * to perform machine-dependent info updates. Defer to cpu_thread_init().
+ */
+void
+ml_cpu_up(void)
+{
+ return;
+}
+
+/*
+ * This is called from the machine-independent layer
+ * to perform machine-dependent info updates.
+ */
+void
+ml_cpu_down(void)
+{
+ i386_deactivate_cpu();
+
+ return;
+}
+
+/*
+ * The following are required for parts of the kernel
+ * that cannot resolve these functions as inlines:
+ */
+extern thread_t current_act(void);
+thread_t
+current_act(void)
+{
+ return(current_thread_fast());
+}
+
+#undef current_thread
+extern thread_t current_thread(void);
+thread_t
+current_thread(void)
+{
+ return(current_thread_fast());
+}
+
+
+boolean_t ml_is64bit(void) {
+
+ return (cpu_mode_is64bit());
+}
+
+
+boolean_t ml_thread_is64bit(thread_t thread) {
+
+ return (thread_is_64bit(thread));
+}
+
+
+boolean_t ml_state_is64bit(void *saved_state) {
+
+ return is_saved_state64(saved_state);
+}
+
+void ml_cpu_set_ldt(int selector)
+{
+ /*
+ * Avoid loading the LDT
+ * if we're setting the KERNEL LDT and it's already set.
+ */
+ if (selector == KERNEL_LDT &&
+ current_cpu_datap()->cpu_ldt == KERNEL_LDT)
+ return;
+
+ lldt(selector);
+ current_cpu_datap()->cpu_ldt = selector;
+}
+
+void ml_fp_setvalid(boolean_t value)
+{
+ fp_setvalid(value);
+}
+
+uint64_t ml_cpu_int_event_time(void)
+{
+ return current_cpu_datap()->cpu_int_event_time;
+}
+
+vm_offset_t ml_stack_remaining(void)
+{
+ uintptr_t local = (uintptr_t) &local;
+
+ if (ml_at_interrupt_context() != 0) {
+ return (local - (current_cpu_datap()->cpu_int_stack_top - INTSTACK_SIZE));
+ } else {
+ return (local - current_thread()->kernel_stack);
+ }
+}
+
+void
+kernel_preempt_check(void)
+{
+ boolean_t intr;
+ unsigned long flags;
+
+ assert(get_preemption_level() == 0);
+
+ __asm__ volatile("pushf; pop %0" : "=r" (flags));
+
+ intr = ((flags & EFL_IF) != 0);
+
+ if ((*ast_pending() & AST_URGENT) && intr == TRUE) {
+ /*
+ * can handle interrupts and preemptions
+ * at this point
+ */
+
+ /*
+ * now cause the PRE-EMPTION trap
+ */
+ __asm__ volatile ("int %0" :: "N" (T_PREEMPT));
+ }
+}
+
+boolean_t machine_timeout_suspended(void) {
+ return (virtualized || pmap_tlb_flush_timeout || spinlock_timed_out || panic_active() || mp_recent_debugger_activity() || ml_recent_wake());
+}
+
+/* Eagerly evaluate all pending timer and thread callouts
+ */
+void ml_timer_evaluate(void) {
+ KERNEL_DEBUG_CONSTANT(DECR_TIMER_RESCAN|DBG_FUNC_START, 0, 0, 0, 0, 0);
+
+ uint64_t te_end, te_start = mach_absolute_time();
+ simple_lock(&ml_timer_evaluation_slock);
+ ml_timer_evaluation_in_progress = TRUE;
+ thread_call_delayed_timer_rescan_all();
+ mp_cpus_call(CPUMASK_ALL, ASYNC, timer_queue_expire_rescan, NULL);
+ ml_timer_evaluation_in_progress = FALSE;
+ ml_timer_eager_evaluations++;
+ te_end = mach_absolute_time();
+ ml_timer_eager_evaluation_max = MAX(ml_timer_eager_evaluation_max, (te_end - te_start));
+ simple_unlock(&ml_timer_evaluation_slock);
+
+ KERNEL_DEBUG_CONSTANT(DECR_TIMER_RESCAN|DBG_FUNC_END, 0, 0, 0, 0, 0);
+}
+
+boolean_t
+ml_timer_forced_evaluation(void) {
+ return ml_timer_evaluation_in_progress;
+}
+
+/* 32-bit right-rotate n bits */
+static inline uint32_t ror32(uint32_t val, const unsigned int n)
+{
+ __asm__ volatile("rorl %%cl,%0" : "=r" (val) : "0" (val), "c" (n));
+ return val;
+}
+
+void
+ml_entropy_collect(void)
+{
+ uint32_t tsc_lo, tsc_hi;
+ uint32_t *ep;
+
+ assert(cpu_number() == master_cpu);
+
+ /* update buffer pointer cyclically */
+ if (EntropyData.index_ptr - EntropyData.buffer == ENTROPY_BUFFER_SIZE)
+ ep = EntropyData.index_ptr = EntropyData.buffer;
+ else
+ ep = EntropyData.index_ptr++;
+
+ rdtsc_nofence(tsc_lo, tsc_hi);
+ *ep = ror32(*ep, 9) ^ tsc_lo;
+}
+
+void
+ml_gpu_stat_update(uint64_t gpu_ns_delta) {
+ current_thread()->machine.thread_gpu_ns += gpu_ns_delta;
+}
+
+uint64_t
+ml_gpu_stat(thread_t t) {
+ return t->machine.thread_gpu_ns;
projects / apple / xnu.git / blobdiff