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Add support for ADJ_OFFSET_SS_READ mode

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Also assume that kernels >= 2.6.27 don't need frequency scaling.
This commit is contained in:
Miroslav Lichvar
2009-05-20 17:43:09 +02:00
parent 75330fdff5
commit 032d1db883
4 changed files with 39 additions and 10 deletions
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34
sys_linux.c
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@@ -103,10 +103,11 @@ static int version_major;
static int version_minor;
static int version_patchlevel;
/* Flag indicating whether adjtimex() with txc.modes equal to zero
returns the remaining time adjustment or not. If not we have to read
the outstanding adjustment by setting it to zero, examining the return
value and setting the outstanding adjustment back again. */
/* Flag indicating whether adjtimex() returns the remaining time adjustment
or not. If not we have to read the outstanding adjustment by setting it to
zero, examining the return value and setting the outstanding adjustment back
again. If 1, txc.modes equal to zero is used to read the time. If 2,
txc.modes is set to ADJ_OFFSET_SS_READ. */
static int have_readonly_adjtime;
@@ -532,11 +533,20 @@ get_offset_correction(struct timeval *raw,
double fast_slew_remaining;
long offset;
if (have_readonly_adjtime) {
if (TMX_GetOffsetLeft(&offset) < 0) {
again:
if (have_readonly_adjtime == 1) {
if (TMX_GetOffsetLeftOld(&offset) < 0) {
CROAK("adjtimex() failed in get_offset_correction");
}
adjtime_left = (double)offset / 1.0e6;
} else if (have_readonly_adjtime == 2) {
if (TMX_GetOffsetLeft(&offset) < 0) {
LOG(LOGS_INFO, LOGF_SysLinux, "adjtimex() doesn't support ADJ_OFFSET_SS_READ");
have_readonly_adjtime = 0;
goto again;
}
adjtime_left = (double)offset / 1.0e6;
} else {
offset = 0;
@@ -796,13 +806,19 @@ get_version_specific_details(void)
case 4:
case 5:
case 6:
if (minor < 6 || patch < 27) {
/* These seem to be like 2.0.32 */
freq_scale = (hz==100) ? (128.0 / 128.125) : basic_freq_scale;
have_readonly_adjtime = 0;
break;
}
/* Let's be optimistic that these will be the same until proven
otherwise :-) */
case 7:
case 8:
/* These seem to be like 2.0.32 */
freq_scale = (hz==100) ? (128.0 / 128.125) : basic_freq_scale;
have_readonly_adjtime = 0;
/* These don't need scaling */
freq_scale = 1.0;
have_readonly_adjtime = 2;
break;
default:
LOG_FATAL(LOGF_SysLinux, "Kernel version not supported yet, sorry.");