paging.h File Reference

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	paging_chunk

Macros
#define	PAGING_CACHE_DISABLED   0b00010000
#define	PAGING_WRITE_THROUGH   0b00001000
#define	PAGING_ACCESS_FROM_ALL   0b00000100
#define	PAGING_IS_WRITEABLE   0b00000010
#define	PAGING_IS_PRESENT   0b00000001
#define	PAGING_TOTAL_ENTRIES_PER_TABLE   1024
#define	PAGING_PAGE_SIZE   4096

Functions
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.
void	paging_enable ()
uint32_t *	paging_get_directory (struct paging_chunk *chunk)
	Returns directory entry pointer for given chunk.
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.
void *	paging_align_address (void *ptr)
	Aligns pointer to page size.
void *	paging_align_address_to_lower_page (void *ptr)
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)

Macro Definition Documentation

PAGING_ACCESS_FROM_ALL

#define PAGING_ACCESS_FROM_ALL   0b00000100

PAGING_CACHE_DISABLED

#define PAGING_CACHE_DISABLED   0b00010000

PAGING_IS_PRESENT

#define PAGING_IS_PRESENT   0b00000001

PAGING_IS_WRITEABLE

#define PAGING_IS_WRITEABLE   0b00000010

PAGING_PAGE_SIZE

#define PAGING_PAGE_SIZE   4096

PAGING_TOTAL_ENTRIES_PER_TABLE

#define PAGING_TOTAL_ENTRIES_PER_TABLE   1024

PAGING_WRITE_THROUGH

#define PAGING_WRITE_THROUGH   0b00001000

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_enable()

void paging_enable

(

)

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_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.