91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
#pragma once
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// ke_thread.h - thread model
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// A THREAD is the unit of scheduling. Every thread belongs to exactly one process.
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#include <stdint.h>
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#include <ob_object.h>
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#include <ke_list.h>
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#include <ke_process.h>
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#define KSTACK_SIZE (64 * 1024) /* 64 KB kernel stack */
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#define USTACK_SIZE (512 * 1024) /* 512 KB user stack */
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typedef enum THREAD_PRIORITY {
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PriorityLow = 0,
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PriorityNormal = 1,
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PriorityHigh = 2,
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PriorityCount = 3,
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} THREAD_PRIORITY;
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typedef enum THREAD_STATE {
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ThreadReady = 0,
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ThreadRunning = 1,
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ThreadWaiting = 2,
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ThreadDead = 3,
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} THREAD_STATE;
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// Saved register context - matches the layout pushed by KeSwitchContext.
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// The saved RSP points to this structure on the kernel stack.
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typedef struct KCONTEXT {
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uint64_t R15, R14, R13, R12;
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uint64_t Rbp, Rbx;
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uint64_t Rip; /* return address back into KeSwitchContext */
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} KCONTEXT;
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typedef struct THREAD {
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OBJECT Header; /* must be first */
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uint32_t ThreadId;
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THREAD_STATE State;
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THREAD_PRIORITY Priority;
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// Quanta consumed without blocking - used by the MLFQ for demotion.
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uint32_t QuantaConsumed;
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PROCESS* Owner;
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LIST_ENTRY ProcessLink; /* node in Owner->ThreadList */
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LIST_ENTRY SchedulerLink; /* node in run queue or wait list */
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// Kernel stack - never PAGE_USER, pointed to by TssRsp0.
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void* KernelStackBase;
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uintptr_t KernelStackTop;
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// Saved context pointer - set by KeSwitchContext.
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KCONTEXT* SavedContext;
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// Non-NULL while State == ThreadWaiting.
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OBJECT* WaitObject;
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// Updated on every context switch so the CPU loads the right kernel stack.
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uintptr_t TssRsp0;
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// Thread Environment Block
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void* Teb;
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// Ring-3 entry point and argument for newly created threads.
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uintptr_t UserEntry;
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uintptr_t UserArg;
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uintptr_t SchedLockFlags; // Stores RFLAGS while thread is context switched out
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void* UserStackBase; // Tracks user stack allocation to prevent memory leaks
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} THREAD;
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__declspec(dllexport) KSTATUS KeCreateThread(PROCESS* owner, uintptr_t entry, uintptr_t arg,
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THREAD_PRIORITY priority, THREAD **out);
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// Create a kernel-mode-only thread. fn is called directly in ring 0 with
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// arg; when fn returns the thread exits automatically. No user stack or TEB
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// is allocated. The thread is owned by the idle process and runs at the
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// given priority.
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__declspec(dllexport) KSTATUS KeCreateKernelThread(uintptr_t fn, uintptr_t arg,
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THREAD_PRIORITY priority, THREAD **out);
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// Mark a thread dead and deschedule it permanently.
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__declspec(dllexport) void KeExitThread(THREAD* thread, int code);
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// Block / unblock primitives used by sync objects.
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void KeBlockThread(THREAD* thread, OBJECT* waitObject);
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void KeUnblockThread(THREAD* thread);
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// Assembly stub - implemented in ke_switch.asm.
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void KeSwitchContext(THREAD* from, THREAD* to);
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