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/** @file basesegment.H
* @brief Defines the base segment (0TB) class.
*/
#ifndef __KERNEL_BASESEGMENT_H
#define __KERNEL_BASESEGMENT_H
#include <kernel/segment.H>
// Forward declaration.
class MessageQueue;
class Block;
/** @class BaseSegment
* @brief Class to manage the base segment at 0 TB.
*
* Contains a chain of blocks associated with the first segment.
*/
class BaseSegment : public Segment
{
protected:
/**
* @brief Constructor.
* Initialize attributes and set base addresss of segment to 0 TB.
*/
BaseSegment() : Segment(0x0), iv_block(NULL) {};
/**
* @brief Destructor
* Delete any blocks owned by this segment.
*/
~BaseSegment();
public:
/**
* @brief Initialize the segment by allocating initial blocks and
* adding to the segment manager.
*/
static void init();
/**
* @brief Implementation of the pure-virtual function from Segment.
*
* Calls block chain to deal with page fault.
*/
bool handlePageFault(task_t* i_task, uint64_t i_addr);
/**
* @brief Allocates a block of virtual memory of the given size
* @param i_mq[in] - Message queue to be associated with the block
* @param i_va[in] - Base virtual address of the block to be allocated
* @param i_size[in] - Requested virtual memory size of the block
* @return int - 0 for successful block allocation, non-zero otherwise
*/
static int mmAllocBlock(MessageQueue* i_mq,void* i_va,
uint64_t i_size);
private:
/**
* @brief Internal implementation of init function.
*/
void _init();
/** Block-chain associated with this Segment. */
Block* iv_block;
};
#endif
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