/*
- * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <kern/misc_protos.h>
#include <kern/spl.h>
#include <kern/assert.h>
+#include <kern/etimer.h>
#include <mach/vm_prot.h>
#include <vm/pmap.h>
#include <vm/vm_kern.h> /* for kernel_map */
#include <i386/ipl.h>
#include <architecture/i386/pio.h>
-#include <i386/misc_protos.h>
-#include <i386/proc_reg.h>
#include <i386/machine_cpu.h>
-#include <i386/lapic.h>
#include <i386/cpuid.h>
-#include <i386/cpu_data.h>
#include <i386/cpu_threads.h>
-#include <i386/perfmon.h>
+#include <i386/mp.h>
#include <i386/machine_routines.h>
+#include <i386/proc_reg.h>
+#include <i386/misc_protos.h>
+#include <i386/lapic.h>
#include <pexpert/pexpert.h>
#include <machine/limits.h>
#include <machine/commpage.h>
uint64_t rtc_decrementer_min;
+uint64_t tsc_rebase_abs_time = 0;
+
void rtclock_intr(x86_saved_state_t *regs);
static uint64_t maxDec; /* longest interval our hardware timer can handle (nsec) */
-/* XXX this should really be in a header somewhere */
-extern clock_timer_func_t rtclock_timer_expire;
-
static void rtc_set_timescale(uint64_t cycles);
static uint64_t rtc_export_speed(uint64_t cycles);
static inline uint64_t
_tsc_to_nanoseconds(uint64_t value)
{
+#if defined(__i386__)
asm volatile("movl %%edx,%%esi ;"
"mull %%ecx ;"
"movl %%edx,%%edi ;"
: "+A" (value)
: "c" (current_cpu_datap()->cpu_nanotime->scale)
: "esi", "edi");
+#elif defined(__x86_64__)
+ asm volatile("mul %%rcx;"
+ "shrq $32, %%rax;"
+ "shlq $32, %%rdx;"
+ "orq %%rdx, %%rax;"
+ : "=a"(value)
+ : "a"(value), "c"(rtc_nanotime_info.scale)
+ : "rdx", "cc" );
+#else
+#error Unsupported architecture
+#endif
return (value);
}
+static inline uint32_t
+_absolutetime_to_microtime(uint64_t abstime, clock_sec_t *secs, clock_usec_t *microsecs)
+{
+ uint32_t remain;
+#if defined(__i386__)
+ asm volatile(
+ "divl %3"
+ : "=a" (*secs), "=d" (remain)
+ : "A" (abstime), "r" (NSEC_PER_SEC));
+ asm volatile(
+ "divl %3"
+ : "=a" (*microsecs)
+ : "0" (remain), "d" (0), "r" (NSEC_PER_USEC));
+#elif defined(__x86_64__)
+ *secs = abstime / (uint64_t)NSEC_PER_SEC;
+ remain = (uint32_t)(abstime % (uint64_t)NSEC_PER_SEC);
+ *microsecs = remain / NSEC_PER_USEC;
+#else
+#error Unsupported architecture
+#endif
+ return remain;
+}
+
+static inline void
+_absolutetime_to_nanotime(uint64_t abstime, clock_sec_t *secs, clock_usec_t *nanosecs)
+{
+#if defined(__i386__)
+ asm volatile(
+ "divl %3"
+ : "=a" (*secs), "=d" (*nanosecs)
+ : "A" (abstime), "r" (NSEC_PER_SEC));
+#elif defined(__x86_64__)
+ *secs = abstime / (uint64_t)NSEC_PER_SEC;
+ *nanosecs = (clock_usec_t)(abstime % (uint64_t)NSEC_PER_SEC);
+#else
+#error Unsupported architecture
+#endif
+}
+
static uint32_t
deadline_to_decrementer(
uint64_t deadline,
uint64_t delta;
if (deadline <= now)
- return rtc_decrementer_min;
+ return (uint32_t)rtc_decrementer_min;
else {
delta = deadline - now;
- return MIN(MAX(rtc_decrementer_min,delta),maxDec);
+ return (uint32_t)MIN(MAX(rtc_decrementer_min,delta),maxDec);
}
}
}
}
+
+/*
+ * Invoked from power management to correct the SFLM TSC entry drift problem:
+ * a small delta is added to the tsc_base. This is equivalent to nudging time
+ * backwards. We require this of the order of a TSC quantum which won't cause
+ * callers of mach_absolute_time() to see time going backwards!
+ */
+void
+rtc_clock_adjust(uint64_t tsc_base_delta)
+{
+ rtc_nanotime_t *rntp = current_cpu_datap()->cpu_nanotime;
+
+ assert(!ml_get_interrupts_enabled());
+ assert(tsc_base_delta < 100ULL); /* i.e. it's small */
+ _rtc_nanotime_adjust(tsc_base_delta, rntp);
+ rtc_nanotime_set_commpage(rntp);
+}
+
+
void
rtc_clock_stepping(__unused uint32_t new_frequency,
__unused uint32_t old_frequency)
rtc_set_timescale(uint64_t cycles)
{
rtc_nanotime_t *rntp = current_cpu_datap()->cpu_nanotime;
- rntp->scale = ((uint64_t)NSEC_PER_SEC << 32) / cycles;
+ rntp->scale = (uint32_t)(((uint64_t)NSEC_PER_SEC << 32) / cycles);
if (cycles <= SLOW_TSC_THRESHOLD)
- rntp->shift = cycles;
+ rntp->shift = (uint32_t)cycles;
else
rntp->shift = 32;
+ if (tsc_rebase_abs_time == 0)
+ tsc_rebase_abs_time = mach_absolute_time();
+
rtc_nanotime_init(0);
}
void
clock_get_system_microtime(
- uint32_t *secs,
- uint32_t *microsecs)
+ clock_sec_t *secs,
+ clock_usec_t *microsecs)
{
uint64_t now = rtc_nanotime_read();
- uint32_t remain;
- asm volatile(
- "divl %3"
- : "=a" (*secs), "=d" (remain)
- : "A" (now), "r" (NSEC_PER_SEC));
- asm volatile(
- "divl %3"
- : "=a" (*microsecs)
- : "0" (remain), "d" (0), "r" (NSEC_PER_USEC));
+ _absolutetime_to_microtime(now, secs, microsecs);
}
void
clock_get_system_nanotime(
- uint32_t *secs,
- uint32_t *nanosecs)
+ clock_sec_t *secs,
+ clock_nsec_t *nanosecs)
{
uint64_t now = rtc_nanotime_read();
- asm volatile(
- "divl %3"
- : "=a" (*secs), "=d" (*nanosecs)
- : "A" (now), "r" (NSEC_PER_SEC));
+ _absolutetime_to_nanotime(now, secs, nanosecs);
}
void
uint64_t abstime,
uint64_t epoch,
uint64_t offset,
- uint32_t *secs,
- uint32_t *microsecs)
+ clock_sec_t *secs,
+ clock_usec_t *microsecs)
{
- uint64_t now = abstime;
+ uint64_t now = abstime + offset;
uint32_t remain;
- now += offset;
-
- asm volatile(
- "divl %3"
- : "=a" (*secs), "=d" (remain)
- : "A" (now), "r" (NSEC_PER_SEC));
- asm volatile(
- "divl %3"
- : "=a" (*microsecs)
- : "0" (remain), "d" (0), "r" (NSEC_PER_USEC));
+ remain = _absolutetime_to_microtime(now, secs, microsecs);
- *secs += epoch;
+ *secs += (clock_sec_t)epoch;
commpage_set_timestamp(abstime - remain, *secs);
}
info->numer = info->denom = 1;
}
-void
-clock_set_timer_func(
- clock_timer_func_t func)
-{
- if (rtclock_timer_expire == NULL)
- rtclock_timer_expire = func;
-}
-
/*
* Real-time clock device interrupt.
*/
regs = saved_state64(tregs);
- user_mode = TRUE;
+ if (regs->isf.cs & 0x03)
+ user_mode = TRUE;
rip = regs->isf.rip;
} else {
x86_saved_state32_t *regs;
/* Log the interrupt service latency (-ve value expected by tool) */
KERNEL_DEBUG_CONSTANT(
MACHDBG_CODE(DBG_MACH_EXCP_DECI, 0) | DBG_FUNC_NONE,
- -latency, (uint32_t)rip, user_mode, 0, 0);
+ -(int32_t)latency, (uint32_t)rip, user_mode, 0, 0);
/* call the generic etimer */
etimer_intr(user_mode, rip);
* Request timer pop from the hardware
*/
+
int
setPop(
uint64_t time)
void
absolutetime_to_microtime(
uint64_t abstime,
- uint32_t *secs,
- uint32_t *microsecs)
+ clock_sec_t *secs,
+ clock_usec_t *microsecs)
{
- uint32_t remain;
-
- asm volatile(
- "divl %3"
- : "=a" (*secs), "=d" (remain)
- : "A" (abstime), "r" (NSEC_PER_SEC));
- asm volatile(
- "divl %3"
- : "=a" (*microsecs)
- : "0" (remain), "d" (0), "r" (NSEC_PER_USEC));
+ _absolutetime_to_microtime(abstime, secs, microsecs);
}
void
absolutetime_to_nanotime(
uint64_t abstime,
- uint32_t *secs,
- uint32_t *nanosecs)
+ clock_sec_t *secs,
+ clock_nsec_t *nanosecs)
{
- asm volatile(
- "divl %3"
- : "=a" (*secs), "=d" (*nanosecs)
- : "A" (abstime), "r" (NSEC_PER_SEC));
+ _absolutetime_to_nanotime(abstime, secs, nanosecs);
}
void
nanotime_to_absolutetime(
- uint32_t secs,
- uint32_t nanosecs,
+ clock_sec_t secs,
+ clock_nsec_t nanosecs,
uint64_t *result)
{
*result = ((uint64_t)secs * NSEC_PER_SEC) + nanosecs;
projects / apple / xnu.git / blobdiff