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dm: vhpet: add vHPET support

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vHPET is used as a source of system timer by UEFI (e.g. OVMF).

This provides an alternative to using vPIT, which OVMF assumes is always
connected to vPIC.

This is ported from Bhyve, with a few changes:

- move to user space, using acrn_timer
- enable timers only when necessary

Origin: FreeBSD
License: BSD-3-Clause
URL: https://svnweb.freebsd.org/
commit: 326257
Purpose: Adding vHPET support.
Maintained-by: External

Tracked-On: #2319
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Peter Fang
2019-01-10 19:44:30 -08:00
committed by wenlingz
parent 0343da8c70
commit 4642269248
7 changed files with 1045 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
devicemodel/hw/platform/pit.c
View File

@@ -32,10 +32,9 @@
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <time.h>
#include "vmmapi.h"
#include "timer.h"
#include "inout.h"
#include "pit.h"
@@ -43,7 +42,6 @@
#define PIT_8254_FREQ (1193182)
#define PIT_HZ_TO_TICKS(hz) ((PIT_8254_FREQ + (hz) / 2) / (hz))
#define NS_PER_SEC (1000000000ULL)
#define PERIODIC_MODE(mode) \
((mode) == TIMER_RATEGEN || (mode) == TIMER_SQWAVE)
@@ -62,6 +60,10 @@
assert(err == 0); \
} while (0)
#define vpit_ts_to_ticks(ts) ts_to_ticks(PIT_8254_FREQ, ts)
/* won't overflow since the max value of ticks is 65536 */
#define vpit_ticks_to_ts(tk, ts) ticks_to_ts(PIT_8254_FREQ, tk, ts)
struct vpit_timer_arg {
struct vpit *vpit;
@@ -92,32 +94,9 @@ struct vpit {
/* one vPIT per VM */
pthread_mutex_t vpit_mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t vpit_mtx = PTHREAD_MUTEX_INITIALIZER;
static inline uint64_t
ts_to_ticks(const struct timespec *ts)
{
uint64_t tv_sec_ticks, tv_nsec_ticks;
tv_sec_ticks = ts->tv_sec * PIT_8254_FREQ;
tv_nsec_ticks = howmany(ts->tv_nsec * PIT_8254_FREQ, NS_PER_SEC);
return tv_sec_ticks + tv_nsec_ticks;
}
static inline void
ticks_to_ts(uint64_t ticks, struct timespec *ts)
{
uint64_t ns;
/* won't overflow since the max value of ticks is 65536 */
ns = howmany(ticks * NS_PER_SEC, PIT_8254_FREQ);
ts->tv_sec = ns / NS_PER_SEC;
ts->tv_nsec = ns % NS_PER_SEC;
}
static uint64_t
ticks_elapsed_since(const struct timespec *since)
{
@@ -132,7 +111,7 @@ ticks_elapsed_since(const struct timespec *since)
}
timespecsub(&ts, since);
return ts_to_ticks(&ts);
return vpit_ts_to_ticks(&ts);
}
static bool
@@ -313,7 +292,7 @@ pit_timer_start_cntr0(struct vpit *vpit)
assert(timespecisset(&ts.it_interval));
/* ts.it_value contains the remaining time until expiration */
ticks_to_ts(pit_cr_val(c->cr), &ts.it_interval);
vpit_ticks_to_ts(pit_cr_val(c->cr), &ts.it_interval);
} else {
/*
* Aperiodic mode or no running periodic counter.
@@ -325,7 +304,7 @@ pit_timer_start_cntr0(struct vpit *vpit)
timer_ticks = (c->mode == TIMER_SWSTROBE) ?
c->initial + 1 : c->initial;
ticks_to_ts(timer_ticks, &ts.it_value);
vpit_ticks_to_ts(timer_ticks, &ts.it_value);
/* make it periodic if required */
if (PERIODIC_MODE(c->mode)) {