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 */
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 */
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#ifndef KERN_PAGE_H_
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#ifndef KERN_PAGE_H_
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#define KERN_PAGE_H_
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#define KERN_PAGE_H_
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#include <arch/mm/asid.h>
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#include <arch/types.h>
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#include <arch/types.h>
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#include <typedefs.h>
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#include <mm/as.h>
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#include <memstr.h>
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#include <memstr.h>
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#define PAGE_CACHEABLE_SHIFT        0
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#define PAGE_NOT_CACHEABLE_SHIFT    PAGE_CACHEABLE_SHIFT
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#define PAGE_PRESENT_SHIFT      1
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#define PAGE_NOT_PRESENT_SHIFT      PAGE_PRESENT_SHIFT
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#define PAGE_USER_SHIFT         2
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#define PAGE_KERNEL_SHIFT       PAGE_USER_SHIFT
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#define PAGE_READ_SHIFT         3
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#define PAGE_WRITE_SHIFT        4
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#define PAGE_EXEC_SHIFT         5
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#define PAGE_GLOBAL_SHIFT       6
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#define PAGE_NOT_CACHEABLE  (0<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_CACHEABLE      (1<<PAGE_CACHEABLE_SHIFT)
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#define PAGE_PRESENT        (0<<PAGE_PRESENT_SHIFT)
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#define PAGE_NOT_PRESENT    (1<<PAGE_PRESENT_SHIFT)
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#define PAGE_USER       (1<<PAGE_USER_SHIFT)
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#define PAGE_KERNEL     (0<<PAGE_USER_SHIFT)
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#define PAGE_READ       (1<<PAGE_READ_SHIFT)
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#define PAGE_WRITE      (1<<PAGE_WRITE_SHIFT)
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#define PAGE_EXEC       (1<<PAGE_EXEC_SHIFT)
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#define PAGE_GLOBAL     (1<<PAGE_GLOBAL_SHIFT)
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/**
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/**
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 * Macro for computing page color.
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 * Macro for computing page color.
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 */
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 */
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#define PAGE_COLOR(va)  (((va) >> PAGE_WIDTH) & ((1 << PAGE_COLOR_BITS) - 1))
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#define PAGE_COLOR(va)  (((va) >> PAGE_WIDTH) & ((1 << PAGE_COLOR_BITS) - 1))
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/** Page fault access type. */
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enum pf_access {
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    PF_ACCESS_READ,
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    PF_ACCESS_WRITE,
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    PF_ACCESS_EXEC
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};
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typedef enum pf_access pf_access_t;
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/** Operations to manipulate page mappings. */
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/** Operations to manipulate page mappings. */
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struct page_mapping_operations {
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typedef struct {
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    void (* mapping_insert)(as_t *as, uintptr_t page, uintptr_t frame, int
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    void (* mapping_insert)(as_t *as, uintptr_t page, uintptr_t frame,
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        flags);
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        int flags);
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    void (* mapping_remove)(as_t *as, uintptr_t page);
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    void (* mapping_remove)(as_t *as, uintptr_t page);
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    pte_t *(* mapping_find)(as_t *as, uintptr_t page);
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    pte_t *(* mapping_find)(as_t *as, uintptr_t page);
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};
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typedef struct page_mapping_operations page_mapping_operations_t;
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} page_mapping_operations_t;
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extern page_mapping_operations_t *page_mapping_operations;
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extern page_mapping_operations_t *page_mapping_operations;
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extern void page_init(void);
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extern void page_init(void);
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extern void page_table_lock(as_t *as, bool lock);
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extern void page_table_lock(as_t *as, bool lock);
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extern void page_table_unlock(as_t *as, bool unlock);
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extern void page_table_unlock(as_t *as, bool unlock);
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extern void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame, int
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extern void page_mapping_insert(as_t *as, uintptr_t page, uintptr_t frame,
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    flags);
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    int flags);
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extern void page_mapping_remove(as_t *as, uintptr_t page);
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extern void page_mapping_remove(as_t *as, uintptr_t page);
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extern pte_t *page_mapping_find(as_t *as, uintptr_t page);
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extern pte_t *page_mapping_find(as_t *as, uintptr_t page);
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extern pte_t *page_table_create(int flags);
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extern pte_t *page_table_create(int flags);
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extern void page_table_destroy(pte_t *page_table);
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extern void page_table_destroy(pte_t *page_table);
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extern void map_structure(uintptr_t s, size_t size);
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extern void map_structure(uintptr_t s, size_t size);