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https://github.com/LadybirdBrowser/ladybird.git
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02a95a196f
This patch stops using VirtualRangeAllocator in AddressSpace and instead looks for holes in the region tree when allocating VM space. There are many benefits: - VirtualRangeAllocator is non-intrusive and would call kmalloc/kfree when used. This new solution is allocation-free. This was a source of unpleasant MM/kmalloc deadlocks. - We consolidate authority on what the address space looks like in a single place. Previously, we had both the range allocator *and* the region tree both being used to determine if an address was valid. Now there is only the region tree. - Deallocation of VM when splitting regions is no longer complicated, as we don't need to keep two separate trees in sync.
118 lines
3.4 KiB
C++
118 lines
3.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Time.h>
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#include <Kernel/Process.h>
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#include <Kernel/Time/TimeManagement.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$map_time_page()
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::stdio));
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auto& vmobject = TimeManagement::the().time_page_vmobject();
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auto range = TRY(address_space().try_allocate_randomized(PAGE_SIZE, PAGE_SIZE));
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auto* region = TRY(address_space().allocate_region_with_vmobject(range, vmobject, 0, "Kernel time page"sv, PROT_READ, true));
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return region->vaddr().get();
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}
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ErrorOr<FlatPtr> Process::sys$clock_gettime(clockid_t clock_id, Userspace<timespec*> user_ts)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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TRY(TimeManagement::validate_clock_id(clock_id));
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auto ts = TimeManagement::the().current_time(clock_id).to_timespec();
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TRY(copy_to_user(user_ts, &ts));
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$clock_settime(clockid_t clock_id, Userspace<timespec const*> user_ts)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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TRY(require_promise(Pledge::settime));
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if (!is_superuser())
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return EPERM;
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auto time = TRY(copy_time_from_user(user_ts));
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switch (clock_id) {
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case CLOCK_REALTIME:
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TimeManagement::the().set_epoch_time(time);
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break;
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default:
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return EINVAL;
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}
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$clock_nanosleep(Userspace<Syscall::SC_clock_nanosleep_params const*> user_params)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto params = TRY(copy_typed_from_user(user_params));
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auto requested_sleep = TRY(copy_time_from_user(params.requested_sleep));
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bool is_absolute;
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switch (params.flags) {
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case 0:
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is_absolute = false;
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break;
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case TIMER_ABSTIME:
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is_absolute = true;
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break;
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default:
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return EINVAL;
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}
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TRY(TimeManagement::validate_clock_id(params.clock_id));
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bool was_interrupted;
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if (is_absolute) {
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was_interrupted = Thread::current()->sleep_until(params.clock_id, requested_sleep).was_interrupted();
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} else {
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Time remaining_sleep;
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was_interrupted = Thread::current()->sleep(params.clock_id, requested_sleep, &remaining_sleep).was_interrupted();
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timespec remaining_sleep_ts = remaining_sleep.to_timespec();
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if (was_interrupted && params.remaining_sleep) {
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TRY(copy_to_user(params.remaining_sleep, &remaining_sleep_ts));
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}
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}
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if (was_interrupted)
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return EINTR;
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$adjtime(Userspace<timeval const*> user_delta, Userspace<timeval*> user_old_delta)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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if (user_old_delta) {
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timespec old_delta_ts = TimeManagement::the().remaining_epoch_time_adjustment();
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timeval old_delta;
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timespec_to_timeval(old_delta_ts, old_delta);
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TRY(copy_to_user(user_old_delta, &old_delta));
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}
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if (user_delta) {
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TRY(require_promise(Pledge::settime));
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if (!is_superuser())
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return EPERM;
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auto delta = TRY(copy_time_from_user(user_delta));
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// FIXME: Should use AK::Time internally
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TimeManagement::the().set_remaining_epoch_time_adjustment(delta.to_timespec());
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}
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return 0;
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}
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}
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