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#ifndef __KERNEL_VMMMGR_H
#define __KERNEL_VMMMGR_H
#include <limits.h>
#include <sys/mmio.h>
#include <kernel/types.h>
#include <kernel/spinlock.H>
class VmmManager
{
public:
/**
* Constants used throughout the virtual memory management classes
*/
enum VMM_CONSTS
{
ONE_MEG = 1 * 1024 * 1024,
FOUR_MEG = 4 * ONE_MEG,
EIGHT_MEG = 8 * ONE_MEG,
FULL_MEM_SIZE = FOUR_MEG,
// put the Page Table at the end of our memory space
PTSIZE = (1 << 18),
HTABORG = (FULL_MEM_SIZE - PTSIZE),
};
enum ACCESS_TYPES
{
NO_USER_ACCESS,
READ_O_ACCESS,
NORMAL_ACCESS,
CI_ACCESS,
RO_EXE_ACCESS,
};
static void init();
static void init_slb();
/**
* @brief Responsible for handling PTE misses.
*
* @param[in] t - Task causing the page fault.
* @param[in] effAddr - Effective address accessed to cause fault.
*
* @return true - PTE miss was successfully handled.
*
* If the PTE miss is not successfully handled, the exception
* handler should collect debug information and kill the task.
*/
static bool pteMiss(task_t* t, uint64_t effAddr);
static void* mmioMap(void*, size_t);
static int mmioUnmap(void*, size_t);
/**
* @brief Map a device into the device segment(2TB)
* @param ra[in] - Void pointer to real address to be mapped in
* @param i_devDataSize[in] - Size of device segment block
* @return void* - Pointer to beginning virtual address, NULL otherwise
*/
static void* devMap(void* ra, SEG_DATA_SIZES i_devDataSize);
/**
* @brief Unmap a device from the device segment(2TB)
* @param ea[in] - Void pointer to effective address
* @return int - 0 for successful unmap, non-zero otherwise
*/
static int devUnmap(void* ea);
protected:
VmmManager();
~VmmManager() {};
private:
Spinlock lock;
void initPTEs();
void initSDR1();
bool _pteMiss(task_t*, uint64_t);
};
#endif
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