#include <common.h>
#include <string.h>
#include <mem/vmm.h>
#include <mem/mmu.h>
#include <interrupts/isr.h>
#include <boot/multiboot.h>

Include dependency graph for vmm.c:

Go to the source code of this file.

Data Structures
struct	vmm_domain_t
	We use two domains, kernel and user memory. More...

union	vmm_virtual_address_t
	A virtual address. More...

Macros
#define	ENTRIES 1024
	number of entries in page directories and tables

#define	PAGE_SIZE (ENTRIES * sizeof(page_directory_entry_t))
	The number of bytes per page directory "happens" to equal the size of a page.

#define	MEMORY_SIZE 0x100000000
	4GB address space

#define	PAGE_NUMBER (MEMORY_SIZE / PAGE_SIZE)
	total number of pages

Functions
static void	vmm_destroy_page_table (uint16_t page_table)
	Destroys a page table in the current page directory. More...

page_directory_t *	vmm_create_page_directory ()
	Creates an empty page directory. More...

void	vmm_destroy_page_directory (page_directory_t *dir_phys)
	Destroys a page directory. More...

static void	vmm_refresh_page_directory (page_directory_t *dir_phys)
	Refreshes the page directory entries that are shared across page directories. More...

page_directory_t *	vmm_load_page_directory (page_directory_t *new_directory)
	Loads a new page directory. More...

void	vmm_modify_page_directory (page_directory_t *new_directory)
	Loads a page directory for temporary modification. More...

void	vmm_modified_page_directory ()
	Ends a page directory modification. More...

static page_table_entry_t *	vmm_get_page_table (page_directory_entry_t *dir_entry, vmm_virtual_address_t vaddr)
	Returns a virtual or physical address to a page table in memory. More...

static page_table_entry_t *	vmm_get_page_table_entry (page_directory_entry_t *dir_entry, vmm_virtual_address_t vaddr)
	Returns a virtual or physical address to a page table entry in memory. More...

static vmm_domain_t *	vmm_get_domain (vmm_flags_t flags)
	Extracts a domain from the given flags. More...

static uint8_t	vmm_is_in_domain (void vaddr, vmm_domain_t domain)
	Returns whether a virtual address belongs to a given domain. More...

static vmm_domain_t *	vmm_get_domain_from_address (void *vaddr)
	Returns the domain a virtual address belongs to. More...

static uint8_t	vmm_domain_check (void *vaddr, vmm_flags_t flags)
	Checks whether a virtual address might be accessed with the given flags. More...

uint8_t	vmm_map (void _vaddr, void paddr, vmm_flags_t flags)
	Maps the given page into memory. More...

void	vmm_unmap (void *_vaddr)
	Unmaps the given page from memory. More...

static void	vmm_map_range_detailed (void vaddr, void paddr, size_t len, vmm_flags_t flags, uint8_t map)
	Maps or unmaps the given page(s) into memory. More...

void	vmm_map_range (void vaddr, void paddr, size_t len, vmm_flags_t flags)
	Maps the given page(s) into memory. More...

void	vmm_unmap_range (void *vaddr, size_t len)
	Unmaps the given page(s) from memory. More...

void *	vmm_get_physical_address (void *_vaddr)
	Translates a virtual address into a physical address. More...

void	vmm_dump ()
	Dumps the current page directory. More...

static void *	vmm_find_free (size_t len, vmm_domain_t *domain)
	Finds unmapped pages. More...

static pmm_flags_t	vmm_get_pmm_flags (vmm_flags_t flags)
	Translates VMM into PMM flags. More...

void *	vmm_map_physical_memory (void *paddr, size_t len, vmm_flags_t flags)
	If necessary, maps the given page(s) somewhere into memory. More...

void	vmm_unmap_physical_memory (void *vaddr, size_t len)
	If necessary, unmaps the given page(s) from memory. More...

void	vmm_use (void vaddr, void paddr, size_t len, vmm_flags_t flags)
	Marks the given page(s) as used and maps them into memory. More...

void *	vmm_use_physical_memory (void *paddr, size_t len, vmm_flags_t flags)
	Marks the given page(s) as used and maps them somewhere into memory. More...

void *	vmm_use_virtual_memory (void *vaddr, size_t len, vmm_flags_t flags)
	Marks some page(s) as used and maps them into memory. More...

void *	vmm_alloc (size_t len, vmm_flags_t flags)
	Marks some page(s) as used and maps them somewhere into memory. More...

void	vmm_free (void *vaddr, size_t len)
	Frees the given page(s) and unmaps them from memory. More...

void	vmm_enable_domain_check (uint8_t enable)
	Enables or disables domain checking. More...

void	vmm_init ()
	Initializes the VMM. More...

Variables
static page_directory_t *	page_directory = 0
	the current page directory

static page_directory_t *	old_directory = 0
	for temporary modifications

static uint8_t	old_interrupts = 0
	for temporary modifications

static vmm_domain_t	kernel_domain
	We use 0-1GiB as kernel memory. More...

static vmm_domain_t	user_domain
	The memory 1GiB-4GiB is process-specific. More...

static uint8_t	domain_check_enabled = 0
	whether domain checking is performed

Data Structures

Macros

Functions

Variables