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suyu/src/core/hle/kernel/process_capability.cpp

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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/bit_util.h"
#include "core/hle/kernel/errors.h"
#include "core/hle/kernel/handle_table.h"
#include "core/hle/kernel/process_capability.h"
#include "core/hle/kernel/vm_manager.h"
namespace Kernel {
namespace {
// clang-format off
// Shift offsets for kernel capability types.
enum : u32 {
CapabilityOffset_PriorityAndCoreNum = 3,
CapabilityOffset_Syscall = 4,
CapabilityOffset_MapPhysical = 6,
CapabilityOffset_MapIO = 7,
CapabilityOffset_Interrupt = 11,
CapabilityOffset_ProgramType = 13,
CapabilityOffset_KernelVersion = 14,
CapabilityOffset_HandleTableSize = 15,
CapabilityOffset_Debug = 16,
};
// Combined mask of all parameters that may be initialized only once.
constexpr u32 InitializeOnceMask = (1U << CapabilityOffset_PriorityAndCoreNum) |
(1U << CapabilityOffset_ProgramType) |
(1U << CapabilityOffset_KernelVersion) |
(1U << CapabilityOffset_HandleTableSize) |
(1U << CapabilityOffset_Debug);
// Packed kernel version indicating 10.4.0
constexpr u32 PackedKernelVersion = 0x520000;
// Indicates possible types of capabilities that can be specified.
enum class CapabilityType : u32 {
Unset = 0U,
PriorityAndCoreNum = (1U << CapabilityOffset_PriorityAndCoreNum) - 1,
Syscall = (1U << CapabilityOffset_Syscall) - 1,
MapPhysical = (1U << CapabilityOffset_MapPhysical) - 1,
MapIO = (1U << CapabilityOffset_MapIO) - 1,
Interrupt = (1U << CapabilityOffset_Interrupt) - 1,
ProgramType = (1U << CapabilityOffset_ProgramType) - 1,
KernelVersion = (1U << CapabilityOffset_KernelVersion) - 1,
HandleTableSize = (1U << CapabilityOffset_HandleTableSize) - 1,
Debug = (1U << CapabilityOffset_Debug) - 1,
Ignorable = 0xFFFFFFFFU,
};
// clang-format on
constexpr CapabilityType GetCapabilityType(u32 value) {
return static_cast<CapabilityType>((~value & (value + 1)) - 1);
}
u32 GetFlagBitOffset(CapabilityType type) {
const auto value = static_cast<u32>(type);
return static_cast<u32>(Common::BitSize<u32>() - Common::CountLeadingZeroes32(value));
}
} // Anonymous namespace
ResultCode ProcessCapabilities::InitializeForKernelProcess(const u32* capabilities,
std::size_t num_capabilities,
VMManager& vm_manager) {
Clear();
// Allow all cores and priorities.
core_mask = 0xF;
priority_mask = 0xFFFFFFFFFFFFFFFF;
kernel_version = PackedKernelVersion;
return ParseCapabilities(capabilities, num_capabilities, vm_manager);
}
ResultCode ProcessCapabilities::InitializeForUserProcess(const u32* capabilities,
std::size_t num_capabilities,
VMManager& vm_manager) {
Clear();
return ParseCapabilities(capabilities, num_capabilities, vm_manager);
}
void ProcessCapabilities::InitializeForMetadatalessProcess() {
// Allow all cores and priorities
core_mask = 0xF;
priority_mask = 0xFFFFFFFFFFFFFFFF;
kernel_version = PackedKernelVersion;
// Allow all system calls and interrupts.
svc_capabilities.set();
interrupt_capabilities.set();
// Allow using the maximum possible amount of handles
handle_table_size = static_cast<u32>(HandleTable::MAX_COUNT);
// Allow all debugging capabilities.
is_debuggable = true;
can_force_debug = true;
}
ResultCode ProcessCapabilities::ParseCapabilities(const u32* capabilities,
std::size_t num_capabilities,
VMManager& vm_manager) {
u32 set_flags = 0;
u32 set_svc_bits = 0;
for (std::size_t i = 0; i < num_capabilities; ++i) {
const u32 descriptor = capabilities[i];
const auto type = GetCapabilityType(descriptor);
if (type == CapabilityType::MapPhysical) {
i++;
// The MapPhysical type uses two descriptor flags for its parameters.
// If there's only one, then there's a problem.
if (i >= num_capabilities) {
return ERR_INVALID_COMBINATION;
}
const auto size_flags = capabilities[i];
if (GetCapabilityType(size_flags) != CapabilityType::MapPhysical) {
return ERR_INVALID_COMBINATION;
}
const auto result = HandleMapPhysicalFlags(descriptor, size_flags, vm_manager);
if (result.IsError()) {
return result;
}
} else {
const auto result =
ParseSingleFlagCapability(set_flags, set_svc_bits, descriptor, vm_manager);
if (result.IsError()) {
return result;
}
}
}
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::ParseSingleFlagCapability(u32& set_flags, u32& set_svc_bits,
u32 flag, VMManager& vm_manager) {
const auto type = GetCapabilityType(flag);
if (type == CapabilityType::Unset) {
return ERR_INVALID_CAPABILITY_DESCRIPTOR;
}
// Bail early on ignorable entries, as one would expect,
// ignorable descriptors can be ignored.
if (type == CapabilityType::Ignorable) {
return RESULT_SUCCESS;
}
// Ensure that the give flag hasn't already been initialized before.
// If it has been, then bail.
const u32 flag_length = GetFlagBitOffset(type);
const u32 set_flag = 1U << flag_length;
if ((set_flag & set_flags & InitializeOnceMask) != 0) {
return ERR_INVALID_COMBINATION;
}
set_flags |= set_flag;
switch (type) {
case CapabilityType::PriorityAndCoreNum:
return HandlePriorityCoreNumFlags(flag);
case CapabilityType::Syscall:
return HandleSyscallFlags(set_svc_bits, flag);
case CapabilityType::MapIO:
return HandleMapIOFlags(flag, vm_manager);
case CapabilityType::Interrupt:
return HandleInterruptFlags(flag);
case CapabilityType::ProgramType:
return HandleProgramTypeFlags(flag);
case CapabilityType::KernelVersion:
return HandleKernelVersionFlags(flag);
case CapabilityType::HandleTableSize:
return HandleHandleTableFlags(flag);
case CapabilityType::Debug:
return HandleDebugFlags(flag);
default:
break;
}
return ERR_INVALID_CAPABILITY_DESCRIPTOR;
}
void ProcessCapabilities::Clear() {
svc_capabilities.reset();
interrupt_capabilities.reset();
core_mask = 0;
priority_mask = 0;
handle_table_size = 0;
kernel_version = 0;
is_debuggable = false;
can_force_debug = false;
}
ResultCode ProcessCapabilities::HandlePriorityCoreNumFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleSyscallFlags(u32& set_svc_bits, u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleMapPhysicalFlags(u32 flags, u32 size_flags,
VMManager& vm_manager) {
// TODO(Lioncache): Implement once the memory manager can handle this.
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleMapIOFlags(u32 flags, VMManager& vm_manager) {
// TODO(Lioncache): Implement once the memory manager can handle this.
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleInterruptFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleProgramTypeFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleKernelVersionFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleHandleTableFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
ResultCode ProcessCapabilities::HandleDebugFlags(u32 flags) {
// TODO: Implement
return RESULT_SUCCESS;
}
} // namespace Kernel