mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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363 lines
16 KiB
C++
363 lines
16 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <mesosphere/kern_common.hpp>
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#include <mesosphere/kern_k_thread.hpp>
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#include <mesosphere/kern_select_page_table.hpp>
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#include <mesosphere/kern_svc.hpp>
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namespace ams::kern {
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class KCapabilities {
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private:
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static constexpr size_t SvcFlagCount = svc::NumSupervisorCalls / BITSIZEOF(u8);
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static constexpr size_t IrqFlagCount = /* TODO */0x80;
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enum class CapabilityType : u32 {
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CorePriority = (1u << 3) - 1,
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SyscallMask = (1u << 4) - 1,
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MapRange = (1u << 6) - 1,
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MapIoPage = (1u << 7) - 1,
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MapRegion = (1u << 10) - 1,
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InterruptPair = (1u << 11) - 1,
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ProgramType = (1u << 13) - 1,
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KernelVersion = (1u << 14) - 1,
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HandleTable = (1u << 15) - 1,
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DebugFlags = (1u << 16) - 1,
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Invalid = 0u,
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Padding = ~0u,
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};
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using RawCapabilityValue = util::BitPack32::Field<0, BITSIZEOF(util::BitPack32), u32>;
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static constexpr CapabilityType GetCapabilityType(const util::BitPack32 cap) {
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const u32 value = cap.Get<RawCapabilityValue>();
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return static_cast<CapabilityType>((~value & (value + 1)) - 1);
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}
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static constexpr u32 GetCapabilityFlag(CapabilityType type) {
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return static_cast<u32>(type) + 1;
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}
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static constexpr u32 CountTrailingZero(u32 flag) {
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for (u32 i = 0; i < BITSIZEOF(u32); i++) {
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if (flag & (1u << i)) {
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return i;
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}
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}
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return BITSIZEOF(u32);
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}
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static constexpr u32 GetCapabilityId(CapabilityType type) {
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const u32 flag = GetCapabilityFlag(type);
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if (std::is_constant_evaluated()) {
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return CountTrailingZero(flag);
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} else {
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return static_cast<u32>(__builtin_ctz(flag));
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}
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}
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template<size_t Index, size_t Count, typename T = u32>
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using Field = util::BitPack32::Field<Index, Count, T>;
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#define DEFINE_FIELD(name, prev, ...) using name = Field<prev::Next, __VA_ARGS__>
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template<CapabilityType Type>
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static constexpr inline u32 CapabilityFlag = []() -> u32 {
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return static_cast<u32>(Type) + 1;
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}();
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template<CapabilityType Type>
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static constexpr inline u32 CapabilityId = []() -> u32 {
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const u32 flag = static_cast<u32>(Type) + 1;
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if (std::is_constant_evaluated()) {
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for (u32 i = 0; i < BITSIZEOF(u32); i++) {
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if (flag & (1u << i)) {
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return i;
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}
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}
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return BITSIZEOF(u32);
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} else {
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return __builtin_ctz(flag);
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}
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}();
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struct CorePriority {
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using IdBits = Field<0, CapabilityId<CapabilityType::CorePriority> + 1>;
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DEFINE_FIELD(LowestThreadPriority, IdBits, 6);
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DEFINE_FIELD(HighestThreadPriority, LowestThreadPriority, 6);
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DEFINE_FIELD(MinimumCoreId, HighestThreadPriority, 8);
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DEFINE_FIELD(MaximumCoreId, MinimumCoreId, 8);
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};
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struct SyscallMask {
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using IdBits = Field<0, CapabilityId<CapabilityType::SyscallMask> + 1>;
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DEFINE_FIELD(Mask, IdBits, 24);
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DEFINE_FIELD(Index, Mask, 3);
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};
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static constexpr u64 PhysicalMapAllowedMask = (1ul << 36) - 1;
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struct MapRange {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
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DEFINE_FIELD(Address, IdBits, 24);
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DEFINE_FIELD(ReadOnly, Address, 1, bool);
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};
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struct MapRangeSize {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapRange> + 1>;
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DEFINE_FIELD(Pages, IdBits, 20);
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DEFINE_FIELD(Reserved, Pages, 4);
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DEFINE_FIELD(Normal, Reserved, 1, bool);
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};
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struct MapIoPage {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapIoPage> + 1>;
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DEFINE_FIELD(Address, IdBits, 24);
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};
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enum class RegionType : u32 {
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None = 0,
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KernelTraceBuffer = 1,
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OnMemoryBootImage = 2,
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DTB = 3,
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};
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struct MapRegion {
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using IdBits = Field<0, CapabilityId<CapabilityType::MapRegion> + 1>;
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DEFINE_FIELD(Region0, IdBits, 6, RegionType);
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DEFINE_FIELD(ReadOnly0, Region0, 1, bool);
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DEFINE_FIELD(Region1, ReadOnly0, 6, RegionType);
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DEFINE_FIELD(ReadOnly1, Region1, 1, bool);
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DEFINE_FIELD(Region2, ReadOnly1, 6, RegionType);
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DEFINE_FIELD(ReadOnly2, Region2, 1, bool);
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};
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static const u32 PaddingInterruptId = 0x3FF;
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struct InterruptPair {
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using IdBits = Field<0, CapabilityId<CapabilityType::InterruptPair> + 1>;
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DEFINE_FIELD(InterruptId0, IdBits, 10);
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DEFINE_FIELD(InterruptId1, InterruptId0, 10);
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};
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struct ProgramType {
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using IdBits = Field<0, CapabilityId<CapabilityType::ProgramType> + 1>;
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DEFINE_FIELD(Type, IdBits, 3);
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DEFINE_FIELD(Reserved, Type, 15);
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};
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struct KernelVersion {
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using IdBits = Field<0, CapabilityId<CapabilityType::KernelVersion> + 1>;
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DEFINE_FIELD(MinorVersion, IdBits, 4);
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DEFINE_FIELD(MajorVersion, MinorVersion, 13);
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};
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struct HandleTable {
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using IdBits = Field<0, CapabilityId<CapabilityType::HandleTable> + 1>;
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DEFINE_FIELD(Size, IdBits, 10);
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DEFINE_FIELD(Reserved, Size, 6);
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};
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struct DebugFlags {
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using IdBits = Field<0, CapabilityId<CapabilityType::DebugFlags> + 1>;
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DEFINE_FIELD(AllowDebug, IdBits, 1, bool);
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DEFINE_FIELD(ForceDebug, AllowDebug, 1, bool);
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DEFINE_FIELD(Reserved, ForceDebug, 13);
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};
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#undef DEFINE_FIELD
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static constexpr u32 InitializeOnceFlags = CapabilityFlag<CapabilityType::CorePriority> |
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CapabilityFlag<CapabilityType::ProgramType> |
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CapabilityFlag<CapabilityType::KernelVersion> |
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CapabilityFlag<CapabilityType::HandleTable> |
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CapabilityFlag<CapabilityType::DebugFlags>;
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private:
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u8 svc_access_flags[SvcFlagCount]{};
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u8 irq_access_flags[IrqFlagCount]{};
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u64 core_mask{};
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u64 priority_mask{};
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util::BitPack32 debug_capabilities{0};
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s32 handle_table_size{};
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util::BitPack32 intended_kernel_version{0};
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u32 program_type{};
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private:
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static constexpr ALWAYS_INLINE void SetSvcAllowedImpl(u8 *data, u32 id) {
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constexpr size_t BitsPerWord = BITSIZEOF(*data);
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MESOSPHERE_ASSERT(id < svc::SvcId_Count);
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data[id / BitsPerWord] |= (1ul << (id % BitsPerWord));
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}
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static constexpr ALWAYS_INLINE void ClearSvcAllowedImpl(u8 *data, u32 id) {
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constexpr size_t BitsPerWord = BITSIZEOF(*data);
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MESOSPHERE_ASSERT(id < svc::SvcId_Count);
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data[id / BitsPerWord] &= ~(1ul << (id % BitsPerWord));
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}
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static constexpr ALWAYS_INLINE bool GetSvcAllowedImpl(u8 *data, u32 id) {
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constexpr size_t BitsPerWord = BITSIZEOF(*data);
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MESOSPHERE_ASSERT(id < svc::SvcId_Count);
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return (data[id / BitsPerWord] & (1ul << (id % BitsPerWord))) != 0;
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}
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bool SetSvcAllowed(u32 id) {
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if (id < BITSIZEOF(this->svc_access_flags)) {
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SetSvcAllowedImpl(this->svc_access_flags, id);
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return true;
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} else {
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return false;
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}
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}
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bool SetInterruptPermitted(u32 id) {
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constexpr size_t BitsPerWord = BITSIZEOF(this->irq_access_flags[0]);
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if (id < BITSIZEOF(this->irq_access_flags)) {
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this->irq_access_flags[id / BitsPerWord] |= (1ul << (id % BitsPerWord));
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return true;
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} else {
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return false;
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}
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}
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Result SetCorePriorityCapability(const util::BitPack32 cap);
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Result SetSyscallMaskCapability(const util::BitPack32 cap, u32 &set_svc);
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Result MapRange(const util::BitPack32 cap, const util::BitPack32 size_cap, KProcessPageTable *page_table);
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Result MapIoPage(const util::BitPack32 cap, KProcessPageTable *page_table);
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Result MapRegion(const util::BitPack32 cap, KProcessPageTable *page_table);
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Result SetInterruptPairCapability(const util::BitPack32 cap);
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Result SetProgramTypeCapability(const util::BitPack32 cap);
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Result SetKernelVersionCapability(const util::BitPack32 cap);
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Result SetHandleTableCapability(const util::BitPack32 cap);
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Result SetDebugFlagsCapability(const util::BitPack32 cap);
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Result SetCapability(const util::BitPack32 cap, u32 &set_flags, u32 &set_svc, KProcessPageTable *page_table);
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Result SetCapabilities(const u32 *caps, s32 num_caps, KProcessPageTable *page_table);
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Result SetCapabilities(svc::KUserPointer<const u32 *> user_caps, s32 num_caps, KProcessPageTable *page_table);
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public:
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constexpr KCapabilities() = default;
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Result Initialize(const u32 *caps, s32 num_caps, KProcessPageTable *page_table);
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Result Initialize(svc::KUserPointer<const u32 *> user_caps, s32 num_caps, KProcessPageTable *page_table);
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constexpr u64 GetCoreMask() const { return this->core_mask; }
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constexpr u64 GetPriorityMask() const { return this->priority_mask; }
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constexpr s32 GetHandleTableSize() const { return this->handle_table_size; }
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ALWAYS_INLINE void CopySvcPermissionsTo(KThread::StackParameters &sp) const {
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static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
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/* Copy permissions. */
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std::memcpy(sp.svc_permission, this->svc_access_flags, sizeof(this->svc_access_flags));
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/* Clear specific SVCs based on our state. */
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_SynchronizePreemptionState);
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if (sp.is_pinned) {
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
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}
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}
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ALWAYS_INLINE void CopyPinnedSvcPermissionsTo(KThread::StackParameters &sp) const {
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static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
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/* Clear all permissions. */
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std::memset(sp.svc_permission, 0, sizeof(this->svc_access_flags));
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/* Set specific SVCs based on our state. */
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_SynchronizePreemptionState);
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if (GetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException)) {
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
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}
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}
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ALWAYS_INLINE void CopyUnpinnedSvcPermissionsTo(KThread::StackParameters &sp) const {
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static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
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/* Get whether we have access to return from exception. */
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const bool return_from_exception = GetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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/* Copy permissions. */
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std::memcpy(sp.svc_permission, this->svc_access_flags, sizeof(this->svc_access_flags));
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/* Clear/Set specific SVCs based on our state. */
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_SynchronizePreemptionState);
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if (return_from_exception) {
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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}
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}
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ALWAYS_INLINE void CopyEnterExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
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static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
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/* Set ReturnFromException if allowed. */
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if (GetSvcAllowedImpl(this->svc_access_flags, svc::SvcId_ReturnFromException)) {
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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}
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/* Set GetInfo if allowed. */
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if (GetSvcAllowedImpl(this->svc_access_flags, svc::SvcId_GetInfo)) {
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SetSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
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}
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}
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ALWAYS_INLINE void CopyLeaveExceptionSvcPermissionsTo(KThread::StackParameters &sp) {
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static_assert(sizeof(svc_access_flags) == sizeof(sp.svc_permission));
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/* Clear ReturnFromException. */
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_ReturnFromException);
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/* If pinned, clear GetInfo. */
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if (sp.is_pinned) {
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ClearSvcAllowedImpl(sp.svc_permission, svc::SvcId_GetInfo);
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}
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}
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constexpr bool IsPermittedInterrupt(u32 id) const {
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constexpr size_t BitsPerWord = BITSIZEOF(this->irq_access_flags[0]);
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if (id < BITSIZEOF(this->irq_access_flags)) {
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return (this->irq_access_flags[id / BitsPerWord] & (1ul << (id % BitsPerWord))) != 0;
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} else {
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return false;
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}
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}
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constexpr bool IsPermittedDebug() const {
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return this->debug_capabilities.Get<DebugFlags::AllowDebug>();
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}
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constexpr bool CanForceDebug() const {
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return this->debug_capabilities.Get<DebugFlags::ForceDebug>();
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}
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constexpr u32 GetIntendedKernelMajorVersion() const { return this->intended_kernel_version.Get<KernelVersion::MajorVersion>(); }
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constexpr u32 GetIntendedKernelMinorVersion() const { return this->intended_kernel_version.Get<KernelVersion::MinorVersion>(); }
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constexpr u32 GetIntendedKernelVersion() const { return ams::svc::EncodeKernelVersion(this->GetIntendedKernelMajorVersion(), this->GetIntendedKernelMinorVersion()); }
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};
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}
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