vmem_map.c File Reference

Virtual memory mapping routines. More...

Macros
#define	__DEBUG_HEADER__   "[VMEM ]"
	Change header.
#define	__DEBUG_LEVEL__   LOGLEVEL_NOTICE
	Set log level.
#define	VIRTUAL_MEMORY_PAGES_COUNT   (VIRTUAL_MEMORY_SIZE_MB * 256)
	Number of virtual memory pages.
#define	VIRTUAL_MAPPING_BASE   (PROCAREA_END_ADDR + 0x38000000)
	Base address for virtual memory mapping.
#define	VIRT_PAGE_TO_ADDRESS(page)   ((((page) - virt_pages) * PAGE_SIZE) + VIRTUAL_MAPPING_BASE)
	Converts a virtual page to its address.
#define	VIRT_ADDRESS_TO_PAGE(addr)   ((((addr) - VIRTUAL_MAPPING_BASE) / PAGE_SIZE) + virt_pages)
	Converts an address to its corresponding virtual page.

Functions
int	virt_init (void)
	Initialize the virtual memory mapper. More...
static virt_map_page_t *	_alloc_virt_pages (uint32_t pfn_count)
	Allocates a virtual page, given the page frame count. More...
uint32_t	virt_map_physical_pages (page_t *page, int pfn_count)
	Maps physical pages to virtual memory. More...
virt_map_page_t *	virt_map_alloc (uint32_t size)
	Allocates virtual pages for a given size. More...
uint32_t	virt_map_vaddress (mm_struct_t *mm, virt_map_page_t *vpage, uint32_t vaddr, uint32_t size)
	Maps a virtual address to a virtual memory area. More...
int	virtual_check_address (uint32_t addr)
	Checks if an address belongs to the virtual memory mapping. More...
int	virt_unmap (uint32_t addr)
	Unmaps a virtual address from the virtual memory. More...
int	virt_unmap_pg (virt_map_page_t *page)
	Unmap a page. More...
void	virt_memcpy (mm_struct_t *dst_mm, uint32_t dst_vaddr, mm_struct_t *src_mm, uint32_t src_vaddr, uint32_t size)
	Memcpy from different processes virtual addresses. More...

Variables
static virt_map_page_manager_t	virt_default_mapping
	Virtual addresses manager.
virt_map_page_t	virt_pages [VIRTUAL_MEMORY_PAGES_COUNT]
	Array of virtual pages.

Detailed Description

Virtual memory mapping routines.

Copyright

(c) 2014-2024 This file is distributed under the MIT License. See LICENSE.md for details.

Function Documentation

_alloc_virt_pages()

static virt_map_page_t* _alloc_virt_pages ( uint32_t  pfn_count )

static

Allocates a virtual page, given the page frame count.

Parameters

pfn_count

the page frame count.

Returns

pointer to the virtual page.

virt_init()

int virt_init

(

void

)

Initialize the virtual memory mapper.

Returns

Returns 0 on success, or -1 if an error occurs.

virt_map_alloc()

virt_map_page_t* virt_map_alloc

(

uint32_t

size

)

Allocates virtual pages for a given size.

Parameters

size	The size in bytes to allocate.

Returns

Pointer to the allocated virtual pages, or NULL on failure.

virt_map_physical_pages()

uint32_t virt_map_physical_pages	(	page_t *	page,
		int	pfn_count
	)

Maps physical pages to virtual memory.

Parameters

page	Pointer to the physical page.
pfn_count	The number of page frames to map.

Returns

The virtual address of the mapped pages, or 0 on failure.

virt_map_vaddress()

uint32_t virt_map_vaddress	(	mm_struct_t *	mm,
		virt_map_page_t *	vpage,
		uint32_t	vaddr,
		uint32_t	size
	)

Maps a virtual address to a virtual memory area.

Parameters

mm	Pointer to the memory management structure.
vpage	Pointer to the virtual map page.
vaddr	The virtual address to map.
size	The size of the memory area to map.

Returns

The starting virtual address of the mapped area, or 0 on failure.

virt_memcpy()

void virt_memcpy	(	mm_struct_t *	dst_mm,
		uint32_t	dst_vaddr,
		mm_struct_t *	src_mm,
		uint32_t	src_vaddr,
		uint32_t	size
	)

Memcpy from different processes virtual addresses.

Parameters

dst_mm	The destination memory struct
dst_vaddr	The destination memory address
src_mm	The source memory struct
src_vaddr	The source memory address
size	The size in bytes of the copy

virt_unmap()

int virt_unmap

(

uint32_t

addr

)

Unmaps a virtual address from the virtual memory.

Parameters

addr	The virtual address to unmap.

Returns

Returns 0 on success, or -1 if an error occurs.

virt_unmap_pg()

int virt_unmap_pg

(

virt_map_page_t *

page

)

Unmap a page.

Parameters

page	Pointer to the page to unmap.

Returns

Returns 0 on success, or -1 if an error occurs.

virtual_check_address()

int virtual_check_address

(

uint32_t

addr

)

Checks if an address belongs to the virtual memory mapping.

Parameters

addr	The address to check.

Returns

1 if it belongs to the virtual memory mapping, 0 otherwise.