Memory Map

Collaboration diagram for Memory Map:

Macros
#define	OS_PAGE_SIZE   (128 * 1024)

Typedefs
typedef enum OSMemoryMapMode	OSMemoryMapMode

Enumerations
enum	OSMemoryMapMode {   OS_MAP_MEMORY_INVALID = 0 ,   OS_MAP_MEMORY_READ_ONLY = 1 ,   OS_MAP_MEMORY_READ_WRITE = 2 ,   OS_MAP_MEMORY_FREE = 3 ,   OS_MAP_MEMORY_ALLOCATED = 4 }

Functions
uint32_t	OSEffectiveToPhysical (uint32_t virtualAddress)
BOOL	OSIsAddressValid (uint32_t virtualAddress)
BOOL	__OSValidateAddressSpaceRange (int, uint32_t virtualAddress, uint32_t size)
uint32_t	OSAllocVirtAddr (uint32_t virtualAddress, uint32_t size, uint32_t align)
	Allocates virtual address range for later mapping. More...
BOOL	OSFreeVirtAddr (uint32_t virtualAddress, uint32_t size)
	Frees a previously allocated virtual address range back to the system. More...
OSMemoryMapMode	OSQueryVirtAddr (uint32_t virtualAddress)
	Determines the status of the given virtual memory address - mapped read-write or read-only, free, allocated or invalid. More...
BOOL	OSMapMemory (uint32_t virtualAddress, uint32_t physicalAddress, uint32_t size, OSMemoryMapMode mode)
	Maps a physical address to a virtual address, with a given size and set of permissions. More...
BOOL	OSUnmapMemory (uint32_t virtualAddress, uint32_t size)
	Unmaps previously mapped memory. More...
void	OSGetMapVirtAddrRange (uint32_t *outVirtualAddress, uint32_t *outSize)
	Gets the range of virtual addresses available for mapping. More...
void	OSGetAvailPhysAddrRange (uint32_t *outPhysicalAddress, uint32_t *outSize)
	Gets the range of available physical memory (not reserved for app code or data). More...
void	OSGetDataPhysAddrRange (uint32_t *outPhysicalAddress, uint32_t *outSize)
	Gets the range of physical memory used for the application's data. More...

Detailed Description

Macro Definition Documentation

OS_PAGE_SIZE

#define OS_PAGE_SIZE   (128 * 1024)

Definition at line 24 of file memorymap.h.

Typedef Documentation

OSMemoryMapMode

typedef enum OSMemoryMapMode OSMemoryMapMode

Enumeration Type Documentation

OSMemoryMapMode

enum OSMemoryMapMode

Enumerator
OS_MAP_MEMORY_INVALID
OS_MAP_MEMORY_READ_ONLY
OS_MAP_MEMORY_READ_WRITE
OS_MAP_MEMORY_FREE
OS_MAP_MEMORY_ALLOCATED

Definition at line 15 of file memorymap.h.

Function Documentation

OSEffectiveToPhysical()

uint32_t OSEffectiveToPhysical

(

uint32_t

virtualAddress

)

OSIsAddressValid()

BOOL OSIsAddressValid

(

uint32_t

virtualAddress

)

__OSValidateAddressSpaceRange()

BOOL __OSValidateAddressSpaceRange	(	int	,
		uint32_t	virtualAddress,
		uint32_t	size
	)

OSAllocVirtAddr()

uint32_t OSAllocVirtAddr	(	uint32_t	virtualAddress,
		uint32_t	size,
		uint32_t	align
	)

Allocates virtual address range for later mapping.

Parameters

virtualAddress	Requested start address for the range. If there is no preference, NULL can be used.
size	Size of address range to allocate.
align	Alignment of address range to allocate.

Returns

The starting address of the newly allocated range, or NULL on failure.

See also

• OSFreeVirtAddr()
• OSMapMemory()

OSFreeVirtAddr()

BOOL OSFreeVirtAddr	(	uint32_t	virtualAddress,
		uint32_t	size
	)

Frees a previously allocated virtual address range back to the system.

Parameters

virtualAddress	The start of the virtual address range to free.
size	The size of the virtual address range to free.

Returns

true on success.

OSQueryVirtAddr()

OSMemoryMapMode OSQueryVirtAddr

(

uint32_t

virtualAddress

)

Determines the status of the given virtual memory address - mapped read-write or read-only, free, allocated or invalid.

Parameters

virtualAddress

The virtual address to query.

Returns

The status of the memory address - see OSMemoryMapMode.

OSMapMemory()

BOOL OSMapMemory	(	uint32_t	virtualAddress,
		uint32_t	physicalAddress,
		uint32_t	size,
		OSMemoryMapMode	mode
	)

Maps a physical address to a virtual address, with a given size and set of permissions.

Parameters

virtualAddress	The target virtual address for the mapping.
physicalAddress	Physical address of the memory to back the mapping.
size	Size, in bytes, of the desired mapping. Likely has an alignment requirement.
mode	Permissions to map the memory with - see OSMemoryMapMode.

Returns

true on success.

See also

• OSAllocVirtAddr()
• OSUnmapMemory()

OSUnmapMemory()

BOOL OSUnmapMemory	(	uint32_t	virtualAddress,
		uint32_t	size
	)

Unmaps previously mapped memory.

Parameters

virtualAddress	Starting address of the area to unmap.
size	Size of the memory area to unmap.

Returns

true on success.

OSGetMapVirtAddrRange()

void OSGetMapVirtAddrRange	(	uint32_t *	outVirtualAddress,
		uint32_t *	outSize
	)

Gets the range of virtual addresses available for mapping.

Parameters

outVirtualAddress	Pointer to write the starting address of the memory area to.
outSize	Pointer to write the size of the memory area to.

See also

• OSMapMemory()

OSGetAvailPhysAddrRange()

void OSGetAvailPhysAddrRange	(	uint32_t *	outPhysicalAddress,
		uint32_t *	outSize
	)

Gets the range of available physical memory (not reserved for app code or data).

Parameters

outPhysicalAddress	Pointer to write the starting physical address of the memory area to.
outSize	Pointer to write the size of the memory area to.

OSGetDataPhysAddrRange()

void OSGetDataPhysAddrRange	(	uint32_t *	outPhysicalAddress,
		uint32_t *	outSize
	)

Gets the range of physical memory used for the application's data.

Parameters

outPhysicalAddress	Pointer to write the starting physical address of the memory area to.
outSize	Pointer to write the size of the memory area to.