paging.c File Reference

#include "paging.h"
#include <stdbool.h>
#include <stdint.h>
#include "common/status.h"
#include "memory/heap/kheap.h"

Functions
uint32_t *	paging_get_directory (struct paging_chunk *chunk)
	Returns directory entry pointer for given chunk.
struct paging_chunk *	paging_new_directory (uint8_t flags)
	Allocates and creates new page directory with specified flags.
void	paging_free_directory (struct paging_chunk *chunk)
	Frees all entries and page directory itself.
void	paging_switch (struct paging_chunk *chunk)
	Switches to given page directory pointer.
int	paging_set_page (uint32_t *directory, void *virtual_address, uint32_t value)
	Sets page table entry.
uint32_t	paging_get_page (uint32_t *directory, void *virtual_address)
void *	paging_align_address (void *ptr)
	Aligns pointer to page size.
void *	paging_align_address_to_lower_page (void *ptr)
int	paging_map (struct paging_chunk *chunk, void *virtual, void *physical, int flags)
	Maps virtual address to physical in page directory.
int	paging_map_range (struct paging_chunk *directory, void *virtual, void *physical, int count, int flags)
	Maps range of virtual addresses to physical in page directory.
int	paging_map_to (struct paging_chunk *chunk, void *virtual_address, void *physical_address, void *physical_end, int flags)
	Maps virtual address to physical in page directory.

Function Documentation

paging_align_address()

void * paging_align_address

(

void *

ptr

)

Aligns pointer to page size.

Parameters

ptr

Returns

void*

References PAGING_PAGE_SIZE.

paging_align_address_to_lower_page()

void * paging_align_address_to_lower_page

(

void *

ptr

)

References PAGING_PAGE_SIZE.

paging_free_directory()

void paging_free_directory

(

struct paging_chunk *

chunk

)

Frees all entries and page directory itself.

Parameters

chunk

Page directory to free

References paging_chunk::directory_entry, and kfree().

paging_get_directory()

uint32_t * paging_get_directory

(

struct paging_chunk *

chunk

)

Returns directory entry pointer for given chunk.

Parameters

chunk

Chunk

Returns

uint32_t* Page directory pointer

References paging_chunk::directory_entry.

paging_get_page()

uint32_t paging_get_page	(	uint32_t *	directory,
		void *	virtual_address )

References EINVARG.

paging_map()

int paging_map	(	struct paging_chunk *	chunk,
		void *	virtual,
		void *	physical,
		int	flags )

Maps virtual address to physical in page directory.

Parameters

chunk	Paging chunk
physical	Physical address
flags	Page directory entry flags

Returns

int Error code

References paging_chunk::directory_entry, EINVARG, flags, PAGING_PAGE_SIZE, and paging_set_page().

paging_map_range()

int paging_map_range	(	struct paging_chunk *	directory,
		void *	virtual,
		void *	physical,
		int	count,
		int	flags )

Maps range of virtual addresses to physical in page directory.

Parameters

directory	Page directory
physical	Physical address
flags	Page directory entry flags
count	Count of entries

Returns

int Error code

References flags, paging_map(), and PAGING_PAGE_SIZE.

paging_map_to()

int paging_map_to	(	struct paging_chunk *	chunk,
		void *	virtual_address,
		void *	physical_address,
		void *	physical_end,
		int	flags )

Maps virtual address to physical in page directory.

Parameters

chunk	Paging chunk
physical_address	Physical address start
physical_end	Physical address end
flags	Page directory entry flags

Returns

int Error code

References EINVARG, flags, paging_map_range(), and PAGING_PAGE_SIZE.

paging_new_directory()

struct paging_chunk * paging_new_directory

(

uint8_t

flags

)

Allocates and creates new page directory with specified flags.

Parameters

flags

Flags for each page table

Returns

paging_chunk* Pointer to new paging chunk

References paging_chunk::directory_entry, flags, kzalloc(), offset, PAGING_IS_WRITEABLE, PAGING_PAGE_SIZE, and PAGING_TOTAL_ENTRIES_PER_TABLE.

paging_set_page()

int paging_set_page	(	uint32_t *	directory,
		void *	virtual_address,
		uint32_t	value )

Sets page table entry.

Parameters

directory	Page directory pointer
virtual_address	Virtual address
value	Value for page table entry

Returns

int Status

References EINVARG.

paging_switch()

void paging_switch

(

struct paging_chunk *

chunk

)

Switches to given page directory pointer.

Parameters

chunk

Page directory pointer

References paging_chunk::directory_entry.