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Atmosphere/libraries/libstratosphere/source/hos/hos_version_api.cpp

124 lines
4.7 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 <stratosphere.hpp>
namespace ams::hos {
namespace {
constinit os::SdkMutex g_hos_init_lock;
constinit hos::Version g_hos_version;
constinit bool g_set_hos_version;
Result GetExosphereApiInfo(exosphere::ApiInfo *out) {
u64 exosphere_cfg;
R_TRY_CATCH(spl::impl::GetConfig(std::addressof(exosphere_cfg), spl::ConfigItem::ExosphereApiVersion)) {
R_CATCH_RETHROW(spl::ResultSecureMonitorNotInitialized)
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
*out = { exosphere_cfg };
return ResultSuccess();
}
Result GetApproximateExosphereApiInfo(exosphere::ApiInfo *out) {
u64 exosphere_cfg;
R_TRY_CATCH(spl::impl::GetConfig(std::addressof(exosphere_cfg), spl::ConfigItem::ExosphereApproximateApiVersion)) {
R_CATCH_RETHROW(spl::ResultSecureMonitorBusy)
} R_END_TRY_CATCH_WITH_ABORT_UNLESS;
*out = { exosphere_cfg };
return ResultSuccess();
}
exosphere::ApiInfo GetExosphereApiInfo(bool allow_approximate) {
exosphere::ApiInfo info;
while (true) {
if (R_SUCCEEDED(GetExosphereApiInfo(std::addressof(info)))) {
return info;
}
if (allow_approximate && R_SUCCEEDED(GetApproximateExosphereApiInfo(std::addressof(info)))) {
return info;
}
svc::SleepThread(TimeSpan::FromMilliSeconds(25).GetNanoSeconds());
}
}
}
void InitializeVersionInternal(bool allow_approximate) {
/* Get the current (and previous approximation of) target firmware. */
hos::Version prev, current;
bool has_prev = false;
{
/* Acquire exclusive access to set hos version. */
std::scoped_lock lk(g_hos_init_lock);
/* Save the previous value of g_hos_version. */
prev = g_hos_version;
has_prev = g_set_hos_version;
/* Set hos version = exosphere api version target firmware. */
g_hos_version = static_cast<hos::Version>(GetExosphereApiInfo(allow_approximate).GetTargetFirmware());
/* Save the current value of g_hos_version. */
current = g_hos_version;
/* Note that we've set a previous hos version. */
g_set_hos_version = true;
}
/* Ensure that this is a hos version we can sanely *try* to run. */
/* To be friendly, we will only require that we recognize the major and minor versions. */
/* We can consider only recognizing major in the future, but micro seems safe to ignore as */
/* there are no breaking IPC changes in minor updates. */
{
constexpr u32 MaxMajor = (static_cast<u32>(hos::Version_Max) >> 24) & 0xFF;
constexpr u32 MaxMinor = (static_cast<u32>(hos::Version_Max) >> 16) & 0xFF;
const u32 major = (static_cast<u32>(current) >> 24) & 0xFF;
const u32 minor = (static_cast<u32>(current) >> 16) & 0xFF;
const bool is_safely_tryable_version = (current <= hos::Version_Max) || (major == MaxMajor && minor <= MaxMinor);
AMS_ABORT_UNLESS(is_safely_tryable_version);
}
/* Ensure that this is a hos version compatible with previous approximations. */
if (has_prev) {
AMS_ABORT_UNLESS(current >= prev);
const u32 current_major = (static_cast<u32>(current) >> 24) & 0xFF;
const u32 prev_major = (static_cast<u32>(prev) >> 24) & 0xFF;
AMS_ABORT_UNLESS(current_major == prev_major);
}
/* Set the version for libnx. */
{
const u32 major = (static_cast<u32>(current) >> 24) & 0xFF;
const u32 minor = (static_cast<u32>(current) >> 16) & 0xFF;
const u32 micro = (static_cast<u32>(current) >> 8) & 0xFF;
hosversionSet((BIT(31)) | (MAKEHOSVERSION(major, minor, micro)));
}
}
::ams::hos::Version GetVersion() {
return g_hos_version;
}
}