ht.h

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/*++
 
Module Name:
 
    ht.h
 
Purpose:
 
    This module contains the header files & prototypes required for the Handle Table implementation of MatanelOS.
 
Author:
 
    slep (Matanel) 2025.
 
Revision History:
 
--*/
 
#ifndef X86_MATANEL_HT_H
#define X86_MATANEL_HT_H
 
#include "core.h"
#include "ms.h"
 
// --------------- STRUCTURES ---------------
 
typedef struct _HANDLE_TABLE_ENTRY {
    union {
        void* Object;       // [USED IF ALLOCATED] Pointer to the Kernel Object
        uint64_t Value;     // Generic value access
    };
    union {
        uint32_t GrantedAccess;       // [USED IF ALLOCATED] Access Mask (Read, Write, etc.)
        uint32_t NextFreeTableEntry;  // [USED IF FREE] Index of the next empty slot
    };
} HANDLE_TABLE_ENTRY, *PHANDLE_TABLE_ENTRY;
 
#define LOW_LEVEL_ENTRIES   (VirtualPageSize / sizeof(HANDLE_TABLE_ENTRY)) // 256 entries per page
#define TABLE_LEVEL_MASK    3
 
typedef struct _HANDLE_TABLE {
    // Linked list of next table (if any)
    DOUBLY_LINKED_LIST TableList;
    SPINLOCK TableLock;
 
    // Storage
    uint64_t TableCode;     // Pointer | Level
    PEPROCESS QuotaProcess;
 
    // Free List Logic
    PHANDLE_TABLE_ENTRY LastFreeHandleEntry;
    uint32_t FirstFreeHandle;    // Index of first free handle, or 0 if none.
    uint32_t NextHandleNeedingPool;
    uint32_t HandleCount;
} HANDLE_TABLE, *PHANDLE_TABLE;
 
// --------------- TYPE DEFINES ---------------
 
typedef int32_t HANDLE, * PHANDLE;
 
// --------------- FUNCTIONS ---------------
 
typedef uint32_t ACCESS_MASK;
 
void*
HtGetObject(
    PHANDLE_TABLE Table,
    HANDLE Handle,
    PHANDLE_TABLE_ENTRY* OutEntry
);
 
void
HtDeleteHandle(
    PHANDLE_TABLE Table,
    HANDLE Handle
);
 
HANDLE
HtCreateHandle(
    PHANDLE_TABLE Table,
    void* Object,
    uint32_t Access
);
 
PHANDLE_TABLE
HtCreateHandleTable(
    IN  PEPROCESS Process
);
 
void
HtDeleteHandleTable(
    IN PHANDLE_TABLE Table
);
 
#endif