Atmosphere/libraries/libmesosphere/source/svc/kern_svc_address_arbiter.cpp

107 lines
4.4 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern::svc {
/* ============================= Common ============================= */
namespace {
constexpr bool IsKernelAddress(uintptr_t address) {
return KernelVirtualAddressSpaceBase <= address && address < KernelVirtualAddressSpaceEnd;
}
constexpr bool IsValidSignalType(ams::svc::SignalType type) {
switch (type) {
case ams::svc::SignalType_Signal:
case ams::svc::SignalType_SignalAndIncrementIfEqual:
case ams::svc::SignalType_SignalAndModifyByWaitingCountIfEqual:
return true;
default:
return false;
}
}
constexpr bool IsValidArbitrationType(ams::svc::ArbitrationType type) {
switch (type) {
case ams::svc::ArbitrationType_WaitIfLessThan:
case ams::svc::ArbitrationType_DecrementAndWaitIfLessThan:
case ams::svc::ArbitrationType_WaitIfEqual:
return true;
default:
return false;
}
}
Result WaitForAddress(uintptr_t address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
/* Validate input. */
R_UNLESS(AMS_LIKELY(!IsKernelAddress(address)), svc::ResultInvalidCurrentMemory());
R_UNLESS(util::IsAligned(address, sizeof(int32_t)), svc::ResultInvalidAddress());
R_UNLESS(IsValidArbitrationType(arb_type), svc::ResultInvalidEnumValue());
/* Convert timeout from nanoseconds to ticks. */
s64 timeout;
if (timeout_ns > 0) {
const ams::svc::Tick offset_tick(TimeSpan::FromNanoSeconds(timeout_ns));
if (AMS_LIKELY(offset_tick > 0)) {
timeout = KHardwareTimer::GetTick() + offset_tick + 2;
if (AMS_UNLIKELY(timeout <= 0)) {
timeout = std::numeric_limits<s64>::max();
}
} else {
timeout = std::numeric_limits<s64>::max();
}
} else {
timeout = timeout_ns;
}
return GetCurrentProcess().WaitAddressArbiter(address, arb_type, value, timeout);
}
Result SignalToAddress(uintptr_t address, ams::svc::SignalType signal_type, int32_t value, int32_t count) {
/* Validate input. */
R_UNLESS(AMS_LIKELY(!IsKernelAddress(address)), svc::ResultInvalidCurrentMemory());
R_UNLESS(util::IsAligned(address, sizeof(int32_t)), svc::ResultInvalidAddress());
R_UNLESS(IsValidSignalType(signal_type), svc::ResultInvalidEnumValue());
return GetCurrentProcess().SignalAddressArbiter(address, signal_type, value, count);
}
}
/* ============================= 64 ABI ============================= */
Result WaitForAddress64(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
return WaitForAddress(address, arb_type, value, timeout_ns);
}
Result SignalToAddress64(ams::svc::Address address, ams::svc::SignalType signal_type, int32_t value, int32_t count) {
return SignalToAddress(address, signal_type, value, count);
}
/* ============================= 64From32 ABI ============================= */
Result WaitForAddress64From32(ams::svc::Address address, ams::svc::ArbitrationType arb_type, int32_t value, int64_t timeout_ns) {
return WaitForAddress(address, arb_type, value, timeout_ns);
}
Result SignalToAddress64From32(ams::svc::Address address, ams::svc::SignalType signal_type, int32_t value, int32_t count) {
return SignalToAddress(address, signal_type, value, count);
}
}