xnu-3247.1.106.tar.gz

[apple/xnu.git] / osfmk / i386 / machine_routines.c

diff --git a/osfmk/i386/machine_routines.c b/osfmk/i386/machine_routines.c
index d0307ca7f33ef95f1062ae0b45686642cea7b9d5..a90d68178a80f6dfc3ea6372a097d9778cba0aff 100644 (file)
--- a/osfmk/i386/machine_routines.c
+++ b/osfmk/i386/machine_routines.c
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -36,26 +36,26 @@
 #include <kern/cpu_data.h>
 #include <kern/cpu_number.h>
 #include <kern/thread.h>
 #include <kern/cpu_data.h>
 #include <kern/cpu_number.h>
 #include <kern/thread.h>

+#include <kern/thread_call.h>
+#include <prng/random.h>

 #include <i386/machine_cpu.h>
 #include <i386/lapic.h>
 #include <i386/machine_cpu.h>
 #include <i386/lapic.h>

+#include <i386/bit_routines.h>

 #include <i386/mp_events.h>
 #include <i386/pmCPU.h>
 #include <i386/mp_events.h>
 #include <i386/pmCPU.h>

+#include <i386/trap.h>

 #include <i386/tsc.h>
 #include <i386/cpu_threads.h>
 #include <i386/proc_reg.h>
 #include <mach/vm_param.h>
 #include <i386/pmap.h>
 #include <i386/tsc.h>
 #include <i386/cpu_threads.h>
 #include <i386/proc_reg.h>
 #include <mach/vm_param.h>
 #include <i386/pmap.h>

+#include <i386/pmap_internal.h>

 #include <i386/misc_protos.h>
 #include <i386/misc_protos.h>

-#if MACH_KDB
-#include <machine/db_machdep.h>
-#include <ddb/db_aout.h>
-#include <ddb/db_access.h>
-#include <ddb/db_sym.h>
-#include <ddb/db_variables.h>
-#include <ddb/db_command.h>
-#include <ddb/db_output.h>
-#include <ddb/db_expr.h>
+#include <kern/timer_queue.h>
+#if KPC
+#include <kern/kpc.h>

 #endif
 #endif

+#include <architecture/i386/pio.h>

 
 #if DEBUG
 #define DBG(x...)      kprintf("DBG: " x)
 
 #if DEBUG
 #define DBG(x...)      kprintf("DBG: " x)


@@ -63,15 +63,26 @@
 #define DBG(x...)
 #endif
 
 #define DBG(x...)
 #endif
 

-

 extern void    wakeup(void *);
 
 static int max_cpus_initialized = 0;
 
 unsigned int   LockTimeOut;
 extern void    wakeup(void *);
 
 static int max_cpus_initialized = 0;
 
 unsigned int   LockTimeOut;

+unsigned int   TLBTimeOut;

 unsigned int   LockTimeOutTSC;
 unsigned int   MutexSpin;
 uint64_t       LastDebuggerEntryAllowance;
 unsigned int   LockTimeOutTSC;
 unsigned int   MutexSpin;
 uint64_t       LastDebuggerEntryAllowance;

+uint64_t       delay_spin_threshold;
+
+extern uint64_t panic_restart_timeout;
+
+boolean_t virtualized = FALSE;
+
+decl_simple_lock_data(static,  ml_timer_evaluation_slock);
+uint32_t ml_timer_eager_evaluations;
+uint64_t ml_timer_eager_evaluation_max;
+static boolean_t ml_timer_evaluation_in_progress = FALSE;
+

 
 #define MAX_CPUS_SET    0x1
 #define MAX_CPUS_WAIT   0x2
 
 #define MAX_CPUS_SET    0x1
 #define MAX_CPUS_WAIT   0x2


@@ -96,8 +107,8 @@ vm_offset_t ml_static_malloc(
 
 void ml_get_bouncepool_info(vm_offset_t *phys_addr, vm_size_t *size)
 {
 
 void ml_get_bouncepool_info(vm_offset_t *phys_addr, vm_size_t *size)
 {

-        *phys_addr = bounce_pool_base;
-       *size      = bounce_pool_size;
+        *phys_addr = 0;
+       *size      = 0;

 }
 
 
 }
 
 


@@ -124,14 +135,13 @@ ml_static_mfree(
 {
        addr64_t vaddr_cur;
        ppnum_t ppn;
 {
        addr64_t vaddr_cur;
        ppnum_t ppn;

-
+       uint32_t freed_pages = 0;

        assert(vaddr >= VM_MIN_KERNEL_ADDRESS);
 
        assert((vaddr & (PAGE_SIZE-1)) == 0); /* must be page aligned */
 
        assert(vaddr >= VM_MIN_KERNEL_ADDRESS);
 
        assert((vaddr & (PAGE_SIZE-1)) == 0); /* must be page aligned */
 

-

        for (vaddr_cur = vaddr;
        for (vaddr_cur = vaddr;

-            vaddr_cur < round_page_64(vaddr+size);
+            vaddr_cur < round_page_64(vaddr+size);

             vaddr_cur += PAGE_SIZE) {
                ppn = pmap_find_phys(kernel_pmap, vaddr_cur);
                if (ppn != (vm_offset_t)NULL) {
             vaddr_cur += PAGE_SIZE) {
                ppn = pmap_find_phys(kernel_pmap, vaddr_cur);
                if (ppn != (vm_offset_t)NULL) {


@@ -142,10 +152,21 @@ ml_static_mfree(
                                        kernel_pmap->stats.resident_count;
                        }
                        pmap_remove(kernel_pmap, vaddr_cur, vaddr_cur+PAGE_SIZE);
                                        kernel_pmap->stats.resident_count;
                        }
                        pmap_remove(kernel_pmap, vaddr_cur, vaddr_cur+PAGE_SIZE);

-                       vm_page_create(ppn,(ppn+1));
-                       vm_page_wire_count--;
+                       assert(pmap_valid_page(ppn));
+                       if (IS_MANAGED_PAGE(ppn)) {
+                               vm_page_create(ppn,(ppn+1));
+                               freed_pages++;
+                       }

                }
        }
                }
        }

+       vm_page_lockspin_queues();
+       vm_page_wire_count -= freed_pages;
+       vm_page_wire_count_initial -= freed_pages;
+       vm_page_unlock_queues();
+
+#if    DEBUG   
+       kprintf("ml_static_mfree: Released 0x%x pages at VA %p, size:0x%llx, last ppn: 0x%x\n", freed_pages, (void *)vaddr, (uint64_t)size, ppn);
+#endif

 }
 
 
 }
 
 


@@ -196,6 +217,38 @@ vm_size_t ml_nofault_copy(
        return nbytes;
 }
 
        return nbytes;
 }
 

+/*
+ *     Routine:        ml_validate_nofault
+ *     Function: Validate that ths address range has a valid translations
+ *                     in the kernel pmap.  If translations are present, they are
+ *                     assumed to be wired; i.e. no attempt is made to guarantee
+ *                     that the translation persist after the check.
+ *  Returns: TRUE if the range is mapped and will not cause a fault,
+ *                     FALSE otherwise.
+ */
+
+boolean_t ml_validate_nofault(
+       vm_offset_t virtsrc, vm_size_t size)
+{
+       addr64_t cur_phys_src;
+       uint32_t count;
+
+       while (size > 0) {
+               if (!(cur_phys_src = kvtophys(virtsrc)))
+                       return FALSE;
+               if (!pmap_valid_page(i386_btop(cur_phys_src)))
+                       return FALSE;
+               count = (uint32_t)(PAGE_SIZE - (cur_phys_src & PAGE_MASK));
+               if (count > size)
+                       count = (uint32_t)size;
+
+               virtsrc += count;
+               size -= count;
+       }
+
+       return TRUE;
+}
+

 /* Interrupt handling */
 
 /* Initialize Interrupts */
 /* Interrupt handling */
 
 /* Initialize Interrupts */


@@ -205,7 +258,6 @@ void ml_init_interrupt(void)
 }
 
 
 }
 
 

-

 /* Get Interrupts Enabled */
 boolean_t ml_get_interrupts_enabled(void)
 {
 /* Get Interrupts Enabled */
 boolean_t ml_get_interrupts_enabled(void)
 {


@@ -218,27 +270,27 @@ boolean_t ml_get_interrupts_enabled(void)
 /* Set Interrupts Enabled */
 boolean_t ml_set_interrupts_enabled(boolean_t enable)
 {
 /* Set Interrupts Enabled */
 boolean_t ml_set_interrupts_enabled(boolean_t enable)
 {

-  unsigned long flags;
+       unsigned long flags;
+       boolean_t istate;
+       
+       __asm__ volatile("pushf; pop    %0" :  "=r" (flags));

 
 

-  __asm__ volatile("pushf; pop %0" :  "=r" (flags));
+       assert(get_interrupt_level() ? (enable == FALSE) : TRUE);

 
 

-  if (enable) {
-       ast_t           *myast;
+       istate = ((flags & EFL_IF) != 0);

 
 

-       myast = ast_pending();
+       if (enable) {
+               __asm__ volatile("sti;nop");

 
 

-       if ( (get_preemption_level() == 0) &&  (*myast & AST_URGENT) ) {
-       __asm__ volatile("sti");
-          __asm__ volatile ("int $0xff");
-        } else {
-         __asm__ volatile ("sti");
+               if ((get_preemption_level() == 0) && (*ast_pending() & AST_URGENT))
+                       __asm__ volatile ("int %0" :: "N" (T_PREEMPT));
+       }
+       else {
+               if (istate)
+                       __asm__ volatile("cli");

        }
        }

-  }
-  else {
-       __asm__ volatile("cli");
-  }

 
 

-  return (flags & EFL_IF) != 0;
+       return istate;

 }
 
 /* Check if running at interrupt context */
 }
 
 /* Check if running at interrupt context */


@@ -247,26 +299,40 @@ boolean_t ml_at_interrupt_context(void)
        return get_interrupt_level() != 0;
 }
 
        return get_interrupt_level() != 0;
 }
 

+void ml_get_power_state(boolean_t *icp, boolean_t *pidlep) {
+       *icp = (get_interrupt_level() != 0);
+       /* These will be technically inaccurate for interrupts that occur
+        * successively within a single "idle exit" event, but shouldn't
+        * matter statistically.
+        */
+       *pidlep = (current_cpu_datap()->lcpu.package->num_idle == topoParms.nLThreadsPerPackage);
+}
+

 /* Generate a fake interrupt */
 void ml_cause_interrupt(void)
 {
        panic("ml_cause_interrupt not defined yet on Intel");
 }
 
 /* Generate a fake interrupt */
 void ml_cause_interrupt(void)
 {
        panic("ml_cause_interrupt not defined yet on Intel");
 }
 

+/*
+ * TODO: transition users of this to kernel_thread_start_priority
+ * ml_thread_policy is an unsupported KPI
+ */

 void ml_thread_policy(
        thread_t thread,
 __unused       unsigned policy_id,
        unsigned policy_info)
 {
        if (policy_info & MACHINE_NETWORK_WORKLOOP) {
 void ml_thread_policy(
        thread_t thread,
 __unused       unsigned policy_id,
        unsigned policy_info)
 {
        if (policy_info & MACHINE_NETWORK_WORKLOOP) {

-               spl_t           s = splsched();
+               thread_precedence_policy_data_t info;
+               __assert_only kern_return_t kret;

 
 

-               thread_lock(thread);
+               info.importance = 1;

 
 

-               set_priority(thread, thread->priority + 1);
-
-               thread_unlock(thread);
-               splx(s);
+               kret = thread_policy_set_internal(thread, THREAD_PRECEDENCE_POLICY,
+                                                               (thread_policy_t)&info,
+                                                               THREAD_PRECEDENCE_POLICY_COUNT);
+               assert(kret == KERN_SUCCESS);

        }
 }
 
        }
 }
 


@@ -298,6 +364,20 @@ machine_signal_idle(
        cpu_interrupt(processor->cpu_id);
 }
 
        cpu_interrupt(processor->cpu_id);
 }
 

+void
+machine_signal_idle_deferred(
+       __unused processor_t processor)
+{
+       panic("Unimplemented");
+}
+
+void
+machine_signal_idle_cancel(
+       __unused processor_t processor)
+{
+       panic("Unimplemented");
+}
+

 static kern_return_t
 register_cpu(
         uint32_t        lapic_id,
 static kern_return_t
 register_cpu(
         uint32_t        lapic_id,


@@ -330,13 +410,16 @@ register_cpu(
        if (this_cpu_datap->cpu_chud == NULL)
                goto failed;
 
        if (this_cpu_datap->cpu_chud == NULL)
                goto failed;
 

+#if KPC
+       if (kpc_register_cpu(this_cpu_datap) != TRUE)
+               goto failed;
+#endif
+

        if (!boot_cpu) {
                cpu_thread_alloc(this_cpu_datap->cpu_number);
                if (this_cpu_datap->lcpu.core == NULL)
                        goto failed;
 
        if (!boot_cpu) {
                cpu_thread_alloc(this_cpu_datap->cpu_number);
                if (this_cpu_datap->lcpu.core == NULL)
                        goto failed;
 

-               pmCPUStateInit();
-

 #if NCOPY_WINDOWS > 0
                this_cpu_datap->cpu_pmap = pmap_cpu_alloc(boot_cpu);
                if (this_cpu_datap->cpu_pmap == NULL)
 #if NCOPY_WINDOWS > 0
                this_cpu_datap->cpu_pmap = pmap_cpu_alloc(boot_cpu);
                if (this_cpu_datap->cpu_pmap == NULL)


@@ -364,6 +447,13 @@ failed:
 #endif
        chudxnu_cpu_free(this_cpu_datap->cpu_chud);
        console_cpu_free(this_cpu_datap->cpu_console_buf);
 #endif
        chudxnu_cpu_free(this_cpu_datap->cpu_chud);
        console_cpu_free(this_cpu_datap->cpu_console_buf);

+#if KPC
+       kpc_counterbuf_free(this_cpu_datap->cpu_kpc_buf[0]);
+       kpc_counterbuf_free(this_cpu_datap->cpu_kpc_buf[1]);
+       kpc_counterbuf_free(this_cpu_datap->cpu_kpc_shadow);
+       kpc_counterbuf_free(this_cpu_datap->cpu_kpc_reload);
+#endif
+

        return KERN_FAILURE;
 }
 
        return KERN_FAILURE;
 }
 


@@ -413,6 +503,12 @@ ml_processor_register(
     /* fix the CPU id */
     this_cpu_datap->cpu_id = cpu_id;
 
     /* fix the CPU id */
     this_cpu_datap->cpu_id = cpu_id;
 

+    /* allocate and initialize other per-cpu structures */
+    if (!boot_cpu) {
+       mp_cpus_call_cpu_init(cpunum);
+       prng_cpu_init(cpunum);
+    }
+

     /* output arg */
     *processor_out = this_cpu_datap->cpu_processor;
 
     /* output arg */
     *processor_out = this_cpu_datap->cpu_processor;
 


@@ -434,8 +530,11 @@ ml_cpu_get_info(ml_cpu_info_t *cpu_infop)
         * Are we supporting MMX/SSE/SSE2/SSE3?
         * As distinct from whether the cpu has these capabilities.
         */
         * Are we supporting MMX/SSE/SSE2/SSE3?
         * As distinct from whether the cpu has these capabilities.
         */

-       os_supports_sse = !!(get_cr4() & CR4_XMM);
-       if ((cpuid_features() & CPUID_FEATURE_SSE4_2) && os_supports_sse)
+       os_supports_sse = !!(get_cr4() & CR4_OSXMM);
+
+       if (ml_fpu_avx_enabled())
+               cpu_infop->vector_unit = 9;
+       else if ((cpuid_features() & CPUID_FEATURE_SSE4_2) && os_supports_sse)

                cpu_infop->vector_unit = 8;
        else if ((cpuid_features() & CPUID_FEATURE_SSE4_1) && os_supports_sse)
                cpu_infop->vector_unit = 7;
                cpu_infop->vector_unit = 8;
        else if ((cpuid_features() & CPUID_FEATURE_SSE4_1) && os_supports_sse)
                cpu_infop->vector_unit = 7;


@@ -523,9 +622,14 @@ ml_init_lock_timeout(void)
 {
        uint64_t        abstime;
        uint32_t        mtxspin;
 {
        uint64_t        abstime;
        uint32_t        mtxspin;

+#if DEVELOPMENT || DEBUG

        uint64_t        default_timeout_ns = NSEC_PER_SEC>>2;
        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        slto;

-       
+       uint32_t        prt;
+

        if (PE_parse_boot_argn("slto_us", &slto, sizeof (slto)))
                default_timeout_ns = slto * NSEC_PER_USEC;
 
        if (PE_parse_boot_argn("slto_us", &slto, sizeof (slto)))
                default_timeout_ns = slto * NSEC_PER_USEC;
 


@@ -534,6 +638,26 @@ ml_init_lock_timeout(void)
        LockTimeOut = (uint32_t) abstime;
        LockTimeOutTSC = (uint32_t) tmrCvt(abstime, tscFCvtn2t);
 
        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("phyreadmaxus", &slto, sizeof (slto))) {
+               default_timeout_ns = slto * NSEC_PER_USEC;
+               nanoseconds_to_absolutetime(default_timeout_ns, &abstime);
+               reportphyreaddelayabs = abstime;
+       }
+

        if (PE_parse_boot_argn("mtxspin", &mtxspin, sizeof (mtxspin))) {
                if (mtxspin > USEC_PER_SEC>>4)
                        mtxspin =  USEC_PER_SEC>>4;
        if (PE_parse_boot_argn("mtxspin", &mtxspin, sizeof (mtxspin))) {
                if (mtxspin > USEC_PER_SEC>>4)
                        mtxspin =  USEC_PER_SEC>>4;


@@ -543,11 +667,33 @@ ml_init_lock_timeout(void)
        }
        MutexSpin = (unsigned int)abstime;
 
        }
        MutexSpin = (unsigned int)abstime;
 

-       nanoseconds_to_absolutetime(2 * NSEC_PER_SEC, &LastDebuggerEntryAllowance);
+       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);

 }
 
 /*
 }
 
 /*

- * This is called from the machine-independent routine cpu_up()
+ * 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
  * to perform machine-dependent info updates. Defer to cpu_thread_init().
  */
 void


@@ -557,12 +703,14 @@ ml_cpu_up(void)
 }
 
 /*
 }
 
 /*

- * This is called from the machine-independent routine cpu_down()
+ * This is called from the machine-independent layer

  * to perform machine-dependent info updates.
  */
 void
 ml_cpu_down(void)
 {
  * to perform machine-dependent info updates.
  */
 void
 ml_cpu_down(void)
 {

+       i386_deactivate_cpu();
+

        return;
 }
 
        return;
 }
 


@@ -613,17 +761,7 @@ void ml_cpu_set_ldt(int selector)
            current_cpu_datap()->cpu_ldt == KERNEL_LDT)
                return;
 
            current_cpu_datap()->cpu_ldt == KERNEL_LDT)
                return;
 

-#if defined(__i386__)
-       /*
-        * If 64bit this requires a mode switch (and back). 
-        */
-       if (cpu_mode_is64bit())
-               ml_64bit_lldt(selector);
-       else
-               lldt(selector);
-#else

        lldt(selector);
        lldt(selector);

-#endif

        current_cpu_datap()->cpu_ldt = selector;
 }
 
        current_cpu_datap()->cpu_ldt = selector;
 }
 


@@ -648,44 +786,90 @@ vm_offset_t ml_stack_remaining(void)
        }
 }
 
        }
 }
 

-#if MACH_KDB
+void
+kernel_preempt_check(void)
+{
+       boolean_t       intr;
+       unsigned long flags;

 
 

-/*
- *     Display the global msrs
- * *           
- *     ms
+       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 
-db_msr(__unused db_expr_t addr,
-       __unused int have_addr,
-       __unused db_expr_t count,
-       __unused char *modif)
+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;

 
 

-       uint32_t        i, msrlow, msrhigh;
+       assert(cpu_number() == master_cpu);

 
 

-       /* Try all of the first 4096 msrs */
-       for (i = 0; i < 4096; i++) {
-               if (!rdmsr_carefully(i, &msrlow, &msrhigh)) {
-                       db_printf("%08X - %08X.%08X\n", i, msrhigh, msrlow);
-               }
-       }
+       /* update buffer pointer cyclically */
+       if (EntropyData.index_ptr - EntropyData.buffer == ENTROPY_BUFFER_SIZE)
+               ep = EntropyData.index_ptr = EntropyData.buffer;
+       else
+               ep = EntropyData.index_ptr++;

 
 

-       /* Try all of the 4096 msrs at 0x0C000000 */
-       for (i = 0; i < 4096; i++) {
-               if (!rdmsr_carefully(0x0C000000 | i, &msrlow, &msrhigh)) {
-                       db_printf("%08X - %08X.%08X\n",
-                               0x0C000000 | i, msrhigh, msrlow);
-               }
-       }
+       rdtsc_nofence(tsc_lo, tsc_hi);
+       *ep = ror32(*ep, 9) ^ tsc_lo;
+}

 
 

-       /* Try all of the 4096 msrs at 0xC0000000 */
-       for (i = 0; i < 4096; i++) {
-               if (!rdmsr_carefully(0xC0000000 | i, &msrlow, &msrhigh)) {
-                       db_printf("%08X - %08X.%08X\n",
-                               0xC0000000 | i, msrhigh, msrlow);
-               }
-       }
+void
+ml_gpu_stat_update(uint64_t gpu_ns_delta) {
+       current_thread()->machine.thread_gpu_ns += gpu_ns_delta;

 }
 
 }
 

-#endif
+uint64_t
+ml_gpu_stat(thread_t t) {
+       return t->machine.thread_gpu_ns;
+}