77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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/*
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File: vm_pool.H
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Author: R. Bettati, Nikhil Gupta
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Department of Computer Science
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Texas A&M University
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Date : 10/26/2010
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Description: Management of the Virtual Memory Pool
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*/
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#ifndef _VM_POOL_H_ // include file only once
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#define _VM_POOL_H_
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/*--------------------------------------------------------------------------*/
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/* DEFINES */
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/*--------------------------------------------------------------------------*/
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/* -- (none) -- */
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/*--------------------------------------------------------------------------*/
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/* INCLUDES */
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/*--------------------------------------------------------------------------*/
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#include "utils.H"
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#include "cont_frame_pool.H"
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/*--------------------------------------------------------------------------*/
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/* DATA STRUCTURES */
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/*--------------------------------------------------------------------------*/
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/* Forward declaration of class PageTable */
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/* We need this to break a circular include sequence. */
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class PageTable;
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/*--------------------------------------------------------------------------*/
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/* V M P o o l */
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/*--------------------------------------------------------------------------*/
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class VMPool { /* Virtual Memory Pool */
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private:
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/* -- DEFINE YOUR VIRTUAL MEMORY POOL DATA STRUCTURE(s) HERE. */
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public:
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VMPool(unsigned long _base_address,
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unsigned long _size,
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ContFramePool *_frame_pool,
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PageTable *_page_table);
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/* Initializes the data structures needed for the management of this
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* virtual-memory pool.
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* _base_address is the logical start address of the pool.
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* _size is the size of the pool in bytes.
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* _frame_pool points to the frame pool that provides the virtual
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* memory pool with physical memory frames.
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* _page_table points to the page table that maps the logical memory
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* references to physical addresses. */
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unsigned long allocate(unsigned long _size);
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/* Allocates a region of _size bytes of memory from the virtual
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* memory pool. If successful, returns the virtual address of the
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* start of the allocated region of memory. If fails, returns 0. */
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void release(unsigned long _start_address);
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/* Releases a region of previously allocated memory. The region
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* is identified by its start address, which was returned when the
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* region was allocated. */
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bool is_legitimate(unsigned long _address);
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/* Returns false if the address is not valid. An address is not valid
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* if it is not part of a region that is currently allocated. */
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};
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#endif
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