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Convert the x86 RTC driver to use new validated BCD<->timespec conversions.

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New common routines were added to kern/subr_clock.c for converting between
calendrical time expressed in BCD and struct timespec. The new functions
return EINVAL on error, as expected when the clock hardware does not provide
valid time.

PR:		224813
Differential Revision:	https://reviews.freebsd.org/D13731 (no reviewers)
This commit is contained in:
Ian Lepore 2018-01-15 16:40:43 +00:00
parent fc8ea4be2a
commit 7c63e50188
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=328005
1 changed files with 22 additions and 37 deletions
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59
sys/x86/isa/atrtc.c
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@ -109,17 +109,6 @@ writertc(int reg, u_char val)
RTC_UNLOCK;
}
static __inline int
readrtc(int port)
{
int readval;
readval = rtcin(port);
if (readval >= 0 && (readval & 0xf) < 0xa && (readval & 0xf0) < 0xa0)
return (bcd2bin(readval));
return (0);
}
static void
atrtc_start(void)
{
@ -169,25 +158,24 @@ atrtc_restore(void)
static void
atrtc_set(struct timespec *ts)
{
struct clocktime ct;
struct bcd_clocktime ct;
clock_ts_to_ct(ts, &ct);
clock_ts_to_bcd(ts, &ct, false);
mtx_lock(&atrtc_time_lock);
/* Disable RTC updates and interrupts. */
writertc(RTC_STATUSB, RTCSB_HALT | RTCSB_24HR);
writertc(RTC_SEC, bin2bcd(ct.sec)); /* Write back Seconds */
writertc(RTC_MIN, bin2bcd(ct.min)); /* Write back Minutes */
writertc(RTC_HRS, bin2bcd(ct.hour)); /* Write back Hours */
writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
writertc(RTC_DAY, bin2bcd(ct.day)); /* Write back Day */
writertc(RTC_MONTH, bin2bcd(ct.mon)); /* Write back Month */
writertc(RTC_YEAR, bin2bcd(ct.year % 100)); /* Write back Year */
writertc(RTC_SEC, ct.sec); /* Write back Seconds */
writertc(RTC_MIN, ct.min); /* Write back Minutes */
writertc(RTC_HRS, ct.hour); /* Write back Hours */
writertc(RTC_WDAY, ct.dow + 1); /* Write back Weekday */
writertc(RTC_DAY, ct.day); /* Write back Day */
writertc(RTC_MONTH, ct.mon); /* Write back Month */
writertc(RTC_YEAR, ct.year & 0xff); /* Write back Year */
#ifdef USE_RTC_CENTURY
writertc(RTC_CENTURY, bin2bcd(ct.year / 100)); /* ... and Century */
writertc(RTC_CENTURY, ct.year >> 8); /* ... and Century */
#endif
/* Re-enable RTC updates and interrupts. */
@ -351,7 +339,7 @@ atrtc_settime(device_t dev __unused, struct timespec *ts)
static int
atrtc_gettime(device_t dev, struct timespec *ts)
{
struct clocktime ct;
struct bcd_clocktime ct;
/* Look if we have a RTC present and the time is valid */
if (!(rtcin(RTC_STATUSD) & RTCSD_PWR)) {
@ -370,24 +358,21 @@ atrtc_gettime(device_t dev, struct timespec *ts)
while (rtcin(RTC_STATUSA) & RTCSA_TUP)
continue;
critical_enter();
ct.nsec = 0;
ct.sec = readrtc(RTC_SEC);
ct.min = readrtc(RTC_MIN);
ct.hour = readrtc(RTC_HRS);
ct.day = readrtc(RTC_DAY);
ct.dow = readrtc(RTC_WDAY) - 1;
ct.mon = readrtc(RTC_MONTH);
ct.year = readrtc(RTC_YEAR);
ct.sec = rtcin(RTC_SEC);
ct.min = rtcin(RTC_MIN);
ct.hour = rtcin(RTC_HRS);
ct.day = rtcin(RTC_DAY);
ct.mon = rtcin(RTC_MONTH);
ct.year = rtcin(RTC_YEAR);
#ifdef USE_RTC_CENTURY
ct.year += readrtc(RTC_CENTURY) * 100;
#else
ct.year += (ct.year < 80 ? 2000 : 1900);
ct.year |= rtcin(RTC_CENTURY) << 8;
#endif
critical_exit();
mtx_unlock(&atrtc_time_lock);
/* Set dow = -1 because some clocks don't set it correctly. */
ct.dow = -1;
return (clock_ct_to_ts(&ct, ts));
/* dow is unused in timespec conversion and we have no nsec info. */
ct.dow = 0;
ct.nsec = 0;
return (clock_bcd_to_ts(&ct, ts, false));
}
static device_method_t atrtc_methods[] = {