paging.h File Reference

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Functions
void	map_pages (void *virt_addr_ptr, void *phys_addr_ptr, int num_pages, char usr, char wr)
void	unmap_pages (void *start_virt, int num_pages)
void *	alloc_pages (int num_pages)
void	alloc_pages_virt (int num_pages, void *addr)
void	paging_init ()
void *	paging_new_address_space ()
void	load_address_space (void *cr3)
void *	virt_to_phys (void *virt_addr)
void *	find_free_pages (int num_pages)
void *	get_cr3 ()

Function Documentation

alloc_pages()

void* alloc_pages

(

int

num_pages

)

Allocate virtual pages & map them to physical memory.

Parameters

num_pages

The number of pages to allocate.

Returns

a pointer to the allocated pages.

alloc_pages_virt()

void alloc_pages_virt	(	int	num_pages,
		void *	addr
	)

Allocate virtual pages at a specific address & map them to physical memory.

Parameters

num_pages	The number of pages to allocate.
addr	The adress to start allocation at.

find_free_pages()

void* find_free_pages

(

int

num_pages

)

Finds free virtual pages and returns the start address

Parameters

num_pages

The minimum size of the free area

Returns

the start of the free area

get_cr3()

void* get_cr3

(

)

Get the current address space

Returns

a pointer to the current address space in physical memory.

load_address_space()

void load_address_space

(

void *

cr3

)

Load an address space

Parameters

cr3	The address space to load

map_pages()

void map_pages	(	void *	virt_addr_ptr,
		void *	phys_addr_ptr,
		int	num_pages,
		char	usr,
		char	wr
	)

Map virtual pages to physical frames.

Parameters

virt_addr_ptr	The start of the virtual range to map.
phys_addr_ptr	The start of the physical range to map.
num_pages	The number of pages to map.
usr	Are the pages acessible by user mode code
wr	Are the pages writable by user mode code (kernel always has write permissions)

paging_init()

void paging_init

(

)

Initialize paging

paging_new_address_space()

void* paging_new_address_space

(

)

Create a new address space

Returns

a pointer to the new address space in physical memory.

unmap_pages()

void unmap_pages	(	void *	start_virt,
		int	num_pages
	)

Unmap virtual pages,

Parameters

start_virt	The start of the virtual range to unmap.
num_pages	The number of pages to map.

virt_to_phys()

void* virt_to_phys

(

void *

virt_addr

)

Convert a virtual address to a physical one.

Parameters

virt_addr

The virtual address to convert

Returns

the physical adress it maps to, or NULL if it is not mapped.