mmu.h

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#ifndef _MMU_H_
#define _MMU_H_

#include <avr32/io.h>
#include "settings.h"

#ifdef __AVR32_AP7000__
#define MMU_DTLB_ENTRIES    32
#define MMU_ITLB_ENTRIES    0
#elif
#error Unknown CPU, MMU configuration must be added to mmu.h
#endif

struct mmu_tlb_t {
    int valid;

    int type;

    int asid;

    int cachable;

    int global;

    int bufferable;

    int access;

    int dirty;

    int page_size;

    int write_through;

    int position;
};


enum {
    MMU_ERROR = -1,
    MMU_OK = 0,
    MMU_ERROR_ARGUMENT = 1,
    MMU_TLB_MISS = 2,

    MMU_DISABLE = 0,
    MMU_ENABLE = 1,
    MMU_PRIVATE_VIRTUAL_MODE = 0,
    MMU_SHARED_VIRTUAL_MODE = 1,
    MMU_SEGMENTATION_OFF = 0,
    MMU_SEGMENTATION_ON = 1,
    MMU_TLB_TYPE_DATA = 0,
    MMU_TLB_TYPE_INSTRUCTION = 1,

    MMU_PAGE_SIZE_1KB = 0,
    MMU_PAGE_SIZE_4KB = 1,
    MMU_PAGE_SIZE_64KB = 2,
    MMU_PAGE_SIZE_1MB = 3,
};

int mmu_init(int enable, int mode, int segmentation);

int mmu_reset();

int mmu_search_virtual_ptr(void * virtual_ptr, long * physical_addr);

int mmu_search_physical_ptr(void * physical_ptr, long * virtual_addr);

int mmu_lock_entries(int entries, int type);

int mmu_add_tlb_entry(long physical_addr_base,
        long virtual_addr_base, struct mmu_tlb_t * options);

void mmu_read_bear_and_tlbehi(long *bear, long *vpn);

int mmu_find_index_to_entry(long physical_addr, long virtual_addr, long *index);

int mmu_invalidate_entry(int index, int type);

#endif

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