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#pragma once
#include <sys.h>
struct page_directory;
typedef struct page_directory pagedir_t;
void paging_setup(void* kernel_data_end);
pagedir_t *get_current_pagedir();
pagedir_t *get_kernel_pagedir();
void switch_pagedir(pagedir_t *pd);
// The three functions below DO NOT DEPEND on argument pd for
// addresses above K_HIGHHALF_ADDR, so just pass 0 to map/unmap in kernel space.
uint32_t pd_get_frame(pagedir_t *pd, size_t vaddr); // get physical frame for virtual address
int pd_map_page(pagedir_t *pd,
size_t vaddr, uint32_t frame_id,
uint32_t rw); // returns nonzero on error
void pd_unmap_page(pagedir_t *pd, size_t vaddr); // does nothing if page wasn't mapped
pagedir_t *create_pagedir(); // returns zero on error
void delete_pagedir(pagedir_t *pd);
/* vim: set ts=4 sw=4 tw=0 noet :*/
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