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Allow the alarm hours/mins/seconds registers to be read/written,

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though without any action. This avoids a hypervisor exit when
o/s's access these regs (Linux).

Reviewed by:	neel
Approved by:	re@ (blanket)
This commit is contained in:
grehan 2013-09-19 04:29:03 +00:00
parent 6f44e4d05b
commit bc1d6700f2
1 changed files with 30 additions and 0 deletions
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30
usr.sbin/bhyve/rtc.c
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@ -46,8 +46,11 @@ __FBSDID("$FreeBSD$");
#define IO_RTC 0x70
#define RTC_SEC 0x00 /* seconds */
#define RTC_SEC_ALARM 0x01
#define RTC_MIN 0x02
#define RTC_MIN_ALARM 0x03
#define RTC_HRS 0x04
#define RTC_HRS_ALARM 0x05
#define RTC_WDAY 0x06
#define RTC_DAY 0x07
#define RTC_MONTH 0x08
@ -94,6 +97,12 @@ static uint8_t rtc_nvram[RTC_NVRAM_SZ];
/* XXX initialize these to default values as they would be from BIOS */
static uint8_t status_a, status_b;
static struct {
uint8_t hours;
uint8_t mins;
uint8_t secs;
} rtc_alarm;
static u_char const bin2bcd_data[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
@ -148,8 +157,11 @@ rtc_addr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
switch (*eax & 0x7f) {
case RTC_SEC:
case RTC_SEC_ALARM:
case RTC_MIN:
case RTC_MIN_ALARM:
case RTC_HRS:
case RTC_HRS_ALARM:
case RTC_WDAY:
case RTC_DAY:
case RTC_MONTH:
@ -199,6 +211,15 @@ rtc_data_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
if (in) {
switch (addr) {
case RTC_SEC_ALARM:
*eax = rtc_alarm.secs;
break;
case RTC_MIN_ALARM:
*eax = rtc_alarm.mins;
break;
case RTC_HRS_ALARM:
*eax = rtc_alarm.hours;
break;
case RTC_SEC:
*eax = rtcout(tm.tm_sec);
return (0);
@ -266,6 +287,15 @@ rtc_data_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
case RTC_STATUSD:
/* ignore write */
break;
case RTC_SEC_ALARM:
rtc_alarm.secs = *eax;
break;
case RTC_MIN_ALARM:
rtc_alarm.mins = *eax;
break;
case RTC_HRS_ALARM:
rtc_alarm.hours = *eax;
break;
case RTC_SEC:
case RTC_MIN:
case RTC_HRS: