// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <bitset>
#include "common/common_types.h"
union ResultCode;
namespace Kernel {
namespace Memory {
class PageTable;
}
/// The possible types of programs that may be indicated
/// by the program type capability descriptor.
enum class ProgramType {
SysModule,
Application,
Applet,
};
/// Handles kernel capability descriptors that are provided by
/// application metadata. These descriptors provide information
/// that alters certain parameters for kernel process instance
/// that will run said application (or applet).
///
/// Capabilities are a sequence of flag descriptors, that indicate various
/// configurations and constraints for a particular process.
///
/// Flag types are indicated by a sequence of set low bits. E.g. the
/// types are indicated with the low bits as follows (where x indicates "don't care"):
///
/// - Priority and core mask : 0bxxxxxxxxxxxx0111
/// - Allowed service call mask: 0bxxxxxxxxxxx01111
/// - Map physical memory : 0bxxxxxxxxx0111111
/// - Map IO memory : 0bxxxxxxxx01111111
/// - Interrupts : 0bxxxx011111111111
/// - Application type : 0bxx01111111111111
/// - Kernel version : 0bx011111111111111
/// - Handle table size : 0b0111111111111111
/// - Debugger flags : 0b1111111111111111
///
/// These are essentially a bit offset subtracted by 1 to create a mask.
/// e.g. The first entry in the above list is simply bit 3 (value 8 -> 0b1000)
/// subtracted by one (7 -> 0b0111)
///
/// An example of a bit layout (using the map physical layout):
/// <example>
/// The MapPhysical type indicates a sequence entry pair of:
///
/// [initial, memory_flags], where:
///
/// initial:
/// bits:
/// 7-24: Starting page to map memory at.
/// 25 : Indicates if the memory should be mapped as read only.
///
/// memory_flags:
/// bits:
/// 7-20 : Number of pages to map
/// 21-25: Seems to be reserved (still checked against though)
/// 26 : Whether or not the memory being mapped is IO memory, or physical memory
/// </example>
///
class ProcessCapabilities {
public:
using InterruptCapabilities = std::bitset<1024>;
using SyscallCapabilities = std::bitset<128>;
ProcessCapabilities() = default;
ProcessCapabilities(const ProcessCapabilities&) = delete;
ProcessCapabilities(ProcessCapabilities&&) = default;
ProcessCapabilities& operator=(const ProcessCapabilities&) = delete;
ProcessCapabilities& operator=(ProcessCapabilities&&) = default;
/// Initializes this process capabilities instance for a kernel process.
///
/// @param capabilities The capabilities to parse
/// @param num_capabilities The number of capabilities to parse.
/// @param page_table The memory manager to use for handling any mapping-related
/// operations (such as mapping IO memory, etc).
///
/// @returns RESULT_SUCCESS if this capabilities instance was able to be initialized,
/// otherwise, an error code upon failure.
///
ResultCode InitializeForKernelProcess(const u32* capabilities, std::size_t num_capabilities,
Memory::PageTable& page_table);
/// Initializes this process capabilities instance for a userland process.
///
/// @param capabilities The capabilities to parse.
/// @param num_capabilities The total number of capabilities to parse.
/// @param page_table The memory manager to use for handling any mapping-related
/// operations (such as mapping IO memory, etc).
///
/// @returns RESULT_SUCCESS if this capabilities instance was able to be initialized,
/// otherwise, an error code upon failure.
///
ResultCode InitializeForUserProcess(const u32* capabilities, std::size_t num_capabilities,
Memory::PageTable& page_table);
/// Initializes this process capabilities instance for a process that does not
/// have any metadata to parse.
///
/// This is necessary, as we allow running raw executables, and the internal
/// kernel process capabilities also determine what CPU cores the process is
/// allowed to run on, and what priorities are allowed for threads. It also
/// determines the max handle table size, what the program type is, whether or
/// not the process can be debugged, or whether it's possible for a process to
/// forcibly debug another process.
///
/// Given the above, this essentially enables all capabilities across the board
/// for the process. It allows the process to:
///
/// - Run on any core
/// - Use any thread priority
/// - Use the maximum amount of handles a process is allowed to.
/// - Be debuggable
/// - Forcibly debug other processes.
///
/// Note that this is not a behavior that the kernel allows a process to do via
/// a single function like this. This is yuzu-specific behavior to handle
/// executables with no capability descriptors whatsoever to derive behavior from.
/// It being yuzu-specific is why this is also not the default behavior and not
/// done by default in the constructor.
///
void InitializeForMetadatalessProcess();
/// Gets the allowable core mask
u64 GetCoreMask() const {
return core_mask;
}
/// Gets the allowable priority mask
u64 GetPriorityMask() const {
return priority_mask;
}
/// Gets the SVC access permission bits
const SyscallCapabilities& GetServiceCapabilities() const {
return svc_capabilities;
}
/// Gets the valid interrupt bits.
const InterruptCapabilities& GetInterruptCapabilities() const {
return interrupt_capabilities;
}
/// Gets the program type for this process.
ProgramType GetProgramType() const {
return program_type;
}
/// Gets the number of total allowable handles for the process' handle table.
s32 GetHandleTableSize() const {
return handle_table_size;
}
/// Gets the kernel version value.
u32 GetKernelVersion() const {
return kernel_version;
}
/// Whether or not this process can be debugged.
bool IsDebuggable() const {
return is_debuggable;
}
/// Whether or not this process can forcibly debug another
/// process, even if that process is not considered debuggable.
bool CanForceDebug() const {
return can_force_debug;
}
private:
/// Attempts to parse a given sequence of capability descriptors.
///
/// @param capabilities The sequence of capability descriptors to parse.
/// @param num_capabilities The number of descriptors within the given sequence.
/// @param page_table The memory manager that will perform any memory
/// mapping if necessary.
///
/// @return RESULT_SUCCESS if no errors occur, otherwise an error code.
///
ResultCode ParseCapabilities(const u32* capabilities, std::size_t num_capabilities,
Memory::PageTable& page_table);
/// Attempts to parse a capability descriptor that is only represented by a
/// single flag set.
///
/// @param set_flags Running set of flags that are used to catch
/// flags being initialized more than once when they shouldn't be.
/// @param set_svc_bits Running set of bits representing the allowed supervisor calls mask.
/// @param flag The flag to attempt to parse.
/// @param page_table The memory manager that will perform any memory
/// mapping if necessary.
///
/// @return RESULT_SUCCESS if no errors occurred, otherwise an error code.
///
ResultCode ParseSingleFlagCapability(u32& set_flags, u32& set_svc_bits, u32 flag,
Memory::PageTable& page_table);
/// Clears the internal state of this process capability instance. Necessary,
/// to have a sane starting point due to us allowing running executables without
/// configuration metadata. We assume a process is not going to have metadata,
/// and if it turns out that the process does, in fact, have metadata, then
/// we attempt to parse it. Thus, we need this to reset data members back to
/// a good state.
///
/// DO NOT ever make this a public member function. This isn't an invariant
/// anything external should depend upon (and if anything comes to rely on it,
/// you should immediately be questioning the design of that thing, not this
/// class. If the kernel itself can run without depending on behavior like that,
/// then so can yuzu).
///
void Clear();
/// Handles flags related to the priority and core number capability flags.
ResultCode HandlePriorityCoreNumFlags(u32 flags);
/// Handles flags related to determining the allowable SVC mask.
ResultCode HandleSyscallFlags(u32& set_svc_bits, u32 flags);
/// Handles flags related to mapping physical memory pages.
ResultCode HandleMapPhysicalFlags(u32 flags, u32 size_flags, Memory::PageTable& page_table);
/// Handles flags related to mapping IO pages.
ResultCode HandleMapIOFlags(u32 flags, Memory::PageTable& page_table);
/// Handles flags related to the interrupt capability flags.
ResultCode HandleInterruptFlags(u32 flags);
/// Handles flags related to the program type.
ResultCode HandleProgramTypeFlags(u32 flags);
/// Handles flags related to the handle table size.
ResultCode HandleHandleTableFlags(u32 flags);
/// Handles flags related to the kernel version capability flags.
ResultCode HandleKernelVersionFlags(u32 flags);
/// Handles flags related to debug-specific capabilities.
ResultCode HandleDebugFlags(u32 flags);
SyscallCapabilities svc_capabilities;
InterruptCapabilities interrupt_capabilities;
u64 core_mask = 0;
u64 priority_mask = 0;
s32 handle_table_size = 0;
u32 kernel_version = 0;
ProgramType program_type = ProgramType::SysModule;
bool is_debuggable = false;
bool can_force_debug = false;
};
} // namespace Kernel
