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/* -------------------------------------------
Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
------------------------------------------- */
#pragma once
#include <NeKit/Defines.h>
#include <NeKit/ErrorOr.h>
/// @file CoreProcessScheduler.h
/// @brief Core Process Scheduler header file.
/// @author Amlal El Mahrouss (amlal@nekernel.org)
#define kSchedMinMicroTime (AffinityKind::kStandard)
#define kSchedInvalidPID (-1)
#define kSchedProcessLimitPerTeam (32U)
#define kSchedTeamCount (256U)
#define kSchedMaxMemoryLimit (gib_cast(128)) /* max physical memory limit */
#define kSchedMaxStackSz (kib_cast(8)) /* maximum stack size */
#define kSchedNameLen (128U)
EXTERN_C void sched_idle_task(void);
namespace Kernel {
class USER_PROCESS;
class KERNEL_TASK;
class KernelTaskScheduler;
class UserProcessScheduler;
class UserProcessTeam;
template <typename T>
struct PROCESS_HEAP_TREE;
template <typename T>
struct PROCESS_SPECIAL_TREE;
template <typename T>
struct PROCESS_FILE_TREE;
enum {
kInvalidTreeKind = 0U,
kRedTreeKind = 100U,
kBlackTreeKind = 101U,
kTreeKindCount = 3U,
};
template <typename T>
struct PROCESS_HEAP_TREE {
static constexpr auto kHeap = true;
static constexpr auto kFile = false;
static constexpr auto kSpecial = false;
T Entry{nullptr};
SizeT EntrySize{0UL};
SizeT EntryPad{0UL};
UInt32 Color{kBlackTreeKind};
struct PROCESS_HEAP_TREE<T>* Parent {
nullptr
};
struct PROCESS_HEAP_TREE<T>* Child {
nullptr
};
struct PROCESS_HEAP_TREE<T>* Prev {
nullptr
};
struct PROCESS_HEAP_TREE<T>* Next {
nullptr
};
};
template <typename T>
struct PROCESS_FILE_TREE {
static constexpr auto kHeap = false;
static constexpr auto kFile = true;
static constexpr auto kSpecial = false;
T Entry{nullptr};
SizeT EntrySize{0UL};
SizeT EntryPad{0UL};
UInt32 Color{kBlackTreeKind};
struct PROCESS_FILE_TREE<T>* Parent {
nullptr
};
struct PROCESS_FILE_TREE<T>* Child {
nullptr
};
struct PROCESS_FILE_TREE<T>* Prev {
nullptr
};
struct PROCESS_FILE_TREE<T>* Next {
nullptr
};
};
using ProcessCtx = UInt32;
template <typename T>
struct PROCESS_SPECIAL_TREE {
static constexpr auto kHeap = false;
static constexpr auto kFile = false;
static constexpr auto kSpecial = true;
T Entry{nullptr};
SizeT EntrySize{0UL};
SizeT EntryPad{0UL};
/// @brief a context is where the resource comes from.
ProcessCtx EntryContext{0UL}; // could be a socket, printer, device...
UInt32 Color{kBlackTreeKind};
struct PROCESS_SPECIAL_TREE<T>* Parent {
nullptr
};
struct PROCESS_SPECIAL_TREE<T>* Child {
nullptr
};
struct PROCESS_SPECIAL_TREE<T>* Prev {
nullptr
};
struct PROCESS_SPECIAL_TREE<T>* Next {
nullptr
};
};
/***********************************************************************************/
/// @brief Subsystem enum type.
/***********************************************************************************/
enum class ProcessSubsystem : Int32 {
kProcessSubsystemSecurity = 100,
kProcessSubsystemUser,
kProcessSubsystemService,
kProcessSubsystemDriver,
kProcessSubsystemKernel,
kProcessSubsystemCount = kProcessSubsystemKernel - kProcessSubsystemSecurity + 1,
kProcessSubsystemInvalid = 0xFFFFFFF,
};
/***********************************************************************************/
//! @brief Local Process status enum.
/***********************************************************************************/
enum class ProcessStatusKind : Int32 {
kInvalid = 0,
kStarting = 100,
kRunning,
kKilled,
kFrozen,
kFinished,
kCount = kFinished - kStarting + 1,
};
/***********************************************************************************/
//! @brief Affinity is the amount of nano-seconds this process is going to run.
/***********************************************************************************/
enum class AffinityKind : Int32 {
kInvalid = 0,
kRealTime = 100,
kVeryHigh = 150,
kHigh = 200,
kStandard = 1000,
kLowUsage = 1500,
kVeryLowUsage = 2000,
};
/***********************************************************************************/
//! Operators for AffinityKind
/***********************************************************************************/
inline bool operator<(AffinityKind lhs, AffinityKind rhs) {
Int32 lhs_int = static_cast<Int32>(lhs);
Int32 rhs_int = static_cast<Int32>(rhs);
return lhs_int < rhs_int;
}
inline bool operator>(AffinityKind lhs, AffinityKind rhs) {
Int32 lhs_int = static_cast<Int32>(lhs);
Int32 rhs_int = static_cast<Int32>(rhs);
return lhs_int > rhs_int;
}
inline bool operator<=(AffinityKind lhs, AffinityKind rhs) {
Int32 lhs_int = static_cast<Int>(lhs);
Int32 rhs_int = static_cast<Int32>(rhs);
return lhs_int <= rhs_int;
}
inline bool operator>=(AffinityKind lhs, AffinityKind rhs) {
Int32 lhs_int = static_cast<Int32>(lhs);
Int32 rhs_int = static_cast<Int32>(rhs);
return lhs_int >= rhs_int;
}
using PTime = UInt64;
using ProcessTime = PTime;
/***********************************************************************************/
//! @brief Local Process Identifier type.
/***********************************************************************************/
using ProcessID = Int64;
/***********************************************************************************/
/// @note For User manager, tells where we run the code.
/***********************************************************************************/
enum class ProcessLevelRing : Int32 {
kRingStdUser = 1,
kRingSuperUser = 2,
kRingGuestUser = 5,
kRingCount = 3,
};
/***********************************************************************************/
/// @brief Helper type to describe a code image.
/***********************************************************************************/
using ImagePtr = VoidPtr;
/***********************************************************************************/
/// @brief Helper class to contain a process's image and blob.
/***********************************************************************************/
struct ProcessImage final {
explicit ProcessImage() = default;
private:
friend USER_PROCESS;
friend KERNEL_TASK;
friend UserProcessScheduler;
friend KernelTaskScheduler;
ImagePtr fCode{};
ImagePtr fBlob{};
public:
Bool HasCode() const { return this->fCode != nullptr; }
Bool HasImage() const { return this->fBlob != nullptr; }
ErrorOr<ImagePtr> LeakImage() {
if (this->fCode) {
return ErrorOr<ImagePtr>{this->fCode};
}
return ErrorOr<ImagePtr>{kErrorInvalidData};
}
ErrorOr<ImagePtr> LeakBlob() {
if (this->fBlob) {
return ErrorOr<ImagePtr>{this->fBlob};
}
return ErrorOr<ImagePtr>{kErrorInvalidData};
}
};
} // namespace Kernel
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