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Kernel: Support more clocks in sys$clock_getres()

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Support all the available clocks in clock_getres(). Also, fix this
function to use the actual ticks per second value, not the constant
`_SC_CLK_TCK` (which is always equal to 8) and move the resolution
computation logic to TimeManagement.
This commit is contained in:
Humberto Alves 2023-02-20 21:06:29 +00:00 • committed by Andreas Kling
parent 3c7a0ef1ac
commit f6eb155167
3 changed files with 12 additions and 10 deletions
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15
Kernel/Syscalls/clock.cpp
View file

@ -98,16 +98,11 @@ ErrorOr<FlatPtr> Process::sys$clock_getres(Userspace<Syscall::SC_clock_getres_pa
{
VERIFY_NO_PROCESS_BIG_LOCK(this);
auto params = TRY(copy_typed_from_user(user_params));
timespec ts {};
switch (params.clock_id) {
case CLOCK_REALTIME:
ts.tv_sec = 0;
ts.tv_nsec = 1000000000 / _SC_CLK_TCK;
TRY(copy_to_user(params.result, &ts));
break;
default:
return EINVAL;
}
TRY(TimeManagement::validate_clock_id(params.clock_id));
auto ts = TimeManagement::the().clock_resolution().to_timespec();
TRY(copy_to_user(params.result, &ts));
return 0;
}

6
Kernel/Time/TimeManagement.cpp
View file

@ -237,6 +237,12 @@ Time TimeManagement::boot_time()
#endif
}
Time TimeManagement::clock_resolution() const
{
long nanoseconds_per_tick = 1'000'000'000 / m_time_keeper_timer->ticks_per_second();
return Time::from_nanoseconds(nanoseconds_per_tick);
}
UNMAP_AFTER_INIT TimeManagement::TimeManagement()
: m_time_page_region(MM.allocate_kernel_region(PAGE_SIZE, "Time page"sv, Memory::Region::Access::ReadWrite, AllocationStrategy::AllocateNow).release_value_but_fixme_should_propagate_errors())
{

1
Kernel/Time/TimeManagement.h
View file

@ -52,6 +52,7 @@ public:
void set_epoch_time(Time);
time_t ticks_per_second() const;
static Time boot_time();
Time clock_resolution() const;
bool is_system_timer(HardwareTimerBase const&) const;