Atmosphere/libraries/libstratosphere/source/sf/cmif/sf_cmif_inline_context.cpp

114 lines
4.3 KiB
C++
Raw Normal View History

/*
* 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::sf {
namespace cmif {
namespace {
#if !defined(ATMOSPHERE_COMPILER_CLANG)
ALWAYS_INLINE util::AtomicRef<uintptr_t> GetAtomicSfInlineContext(os::ThreadType *thread = os::GetCurrentThread()) {
uintptr_t * const p = std::addressof(os::GetSdkInternalTlsArray(thread)->sf_inline_context);
return util::AtomicRef<uintptr_t>(*p);
}
#else
ALWAYS_INLINE util::Atomic<uintptr_t> &GetAtomicSfInlineContext(os::ThreadType *thread = os::GetCurrentThread()) {
uintptr_t * const p = std::addressof(os::GetSdkInternalTlsArray(thread)->sf_inline_context);
static_assert(sizeof(std::atomic<uintptr_t>) == sizeof(uintptr_t));
static_assert(sizeof(util::Atomic<uintptr_t>) == sizeof(std::atomic<uintptr_t>));
return *reinterpret_cast<util::Atomic<uintptr_t> *>(p);
}
#endif
ALWAYS_INLINE void OnSetInlineContext(os::ThreadType *thread) {
#if defined(ATMOSPHERE_OS_HORIZON)
/* Ensure that libnx receives the priority value. */
::fsSetPriority(static_cast<::FsPriority>(::ams::sf::GetFsInlineContext(thread)));
#else
AMS_UNUSED(thread);
#endif
}
}
InlineContext GetInlineContext() {
/* Get the context. */
uintptr_t thread_context = GetAtomicSfInlineContext().Load();
/* Copy it out. */
InlineContext ctx;
static_assert(sizeof(ctx) <= sizeof(thread_context));
std::memcpy(std::addressof(ctx), std::addressof(thread_context), sizeof(ctx));
return ctx;
}
InlineContext SetInlineContext(InlineContext ctx) {
/* Get current thread. */
os::ThreadType * const cur_thread = os::GetCurrentThread();
ON_SCOPE_EXIT { OnSetInlineContext(cur_thread); };
/* Create the new context. */
static_assert(sizeof(ctx) <= sizeof(uintptr_t));
uintptr_t new_context_value = 0;
std::memcpy(std::addressof(new_context_value), std::addressof(ctx), sizeof(ctx));
/* Get the old context. */
uintptr_t old_context_value = GetAtomicSfInlineContext(cur_thread).Exchange(new_context_value);
/* Convert and copy it out. */
InlineContext old_ctx;
std::memcpy(std::addressof(old_ctx), std::addressof(old_context_value), sizeof(old_ctx));
return old_ctx;
}
}
namespace {
#if !defined(ATMOSPHERE_COMPILER_CLANG)
ALWAYS_INLINE util::AtomicRef<u8> GetAtomicFsInlineContext(os::ThreadType *thread) {
uintptr_t * const p = std::addressof(os::GetSdkInternalTlsArray(thread)->sf_inline_context);
return util::AtomicRef<u8>(*reinterpret_cast<u8 *>(p));
}
#else
ALWAYS_INLINE util::Atomic<u8> &GetAtomicFsInlineContext(os::ThreadType *thread) {
uintptr_t * const p = std::addressof(os::GetSdkInternalTlsArray(thread)->sf_inline_context);
static_assert(sizeof(std::atomic<u8>) == sizeof(u8));
static_assert(sizeof(util::Atomic<u8>) == sizeof(std::atomic<u8>));
return *reinterpret_cast<util::Atomic<u8> *>(reinterpret_cast<u8 *>(p));
}
#endif
}
u8 GetFsInlineContext(os::ThreadType *thread) {
return GetAtomicFsInlineContext(thread).Load();
}
u8 SetFsInlineContext(os::ThreadType *thread, u8 ctx) {
ON_SCOPE_EXIT { cmif::OnSetInlineContext(thread); };
return GetAtomicFsInlineContext(thread).Exchange(ctx);
}
}