diff options
| author | phk <phk@FreeBSD.org> | 1998-07-11 08:01:18 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 1998-07-11 08:01:18 +0000 |
| commit | 004328e3736cc96b95744049c4eb8009d6c8dee3 (patch) | |
| tree | b7cc831d19015279b394933301d8dbd4984d9ff1 /sys/isa/rtc.h | |
| parent | f0b863f4b5c8604ff238621b7fcd6becea496675 (diff) | |
| download | FreeBSD-src-004328e3736cc96b95744049c4eb8009d6c8dee3.zip FreeBSD-src-004328e3736cc96b95744049c4eb8009d6c8dee3.tar.gz | |
Improve a couple of comment.
PR: 7242
Reviewed by: phk
Submitted by: Peter Jeremy <peter.jeremyp@alcatel.com.au>
Diffstat (limited to 'sys/isa/rtc.h')
| -rw-r--r-- | sys/isa/rtc.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/sys/isa/rtc.h b/sys/isa/rtc.h index d8b9c14..ea187d9 100644 --- a/sys/isa/rtc.h +++ b/sys/isa/rtc.h @@ -34,14 +34,14 @@ * SUCH DAMAGE. * * from: @(#)rtc.h 7.1 (Berkeley) 5/12/91 - * $Id$ + * $Id: rtc.h,v 1.10 1997/02/22 09:37:03 peter Exp $ */ #ifndef _I386_ISA_RTC_H_ #define _I386_ISA_RTC_H_ 1 /* - * RTC Register locations + * MC146818 RTC Register locations */ #define RTC_SEC 0x00 /* seconds */ @@ -57,8 +57,9 @@ #define RTC_STATUSA 0x0a /* status register A */ #define RTCSA_TUP 0x80 /* time update, don't look now */ +#define RTCSA_RESET 0x70 /* reset divider */ #define RTCSA_DIVIDER 0x20 /* divider correct for 32768 Hz */ -#define RTCSA_8192 0x03 +#define RTCSA_8192 0x03 /* 8192 Hz interrupt */ #define RTCSA_4096 0x04 #define RTCSA_2048 0x05 #define RTCSA_1024 0x06 /* default for profiling */ @@ -70,10 +71,10 @@ #define RTCSA_NOPROF RTCSA_128 #define RTC_NOPROFRATE 128 #define RTCSA_64 0x0a -#define RTCSA_32 0x0b +#define RTCSA_32 0x0b /* 32 Hz interrupt */ #define RTC_STATUSB 0x0b /* status register B */ -#define RTCSB_DST 0x01 /* Daylight Savings Time enable */ +#define RTCSB_DST 0x01 /* USA Daylight Savings Time enable */ #define RTCSB_24HR 0x02 /* 0 = 12 hours, 1 = 24 hours */ #define RTCSB_BCD 0x04 /* 0 = BCD, 1 = Binary coded time */ #define RTCSB_SQWE 0x08 /* 1 = output sqare wave at SQW pin */ @@ -89,7 +90,7 @@ #define RTCIR_INT 0x80 /* interrupt output signal */ #define RTC_STATUSD 0x0d /* status register D (R) Lost Power */ -#define RTCSD_PWR 0x80 /* clock lost power */ +#define RTCSD_PWR 0x80 /* clock power OK */ #define RTC_DIAG 0x0e /* status register E - bios diagnostic */ #define RTCDG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time" |
