Memory Map. More...

#include <data.h>

Public Member Functions
void *	getStartAddress () const
	Get start of this memory area. More...

void *	getEndAddress () const
	Get end of this memory area. More...

bool	isAvailable () const
	Is the memory marked as usable. More...

Memory *	getNext () const
	Get the next memory area. More...

Private Types
enum	Type : uint32_t { AVAILABLE = 1 , RESERVED = 2 , ACPI = 3 , NVS = 4 , BADRAM = 5 }
	Usage Type. More...

Private Attributes
uint32_t	size
	Size of this entry (can exceed size of the class, rest will be padding bits)

uint64_t	addr
	Begin of memory area.

uint64_t	len
	length of the memory area

Detailed Description

Memory Map.

The boot loader queries the BIOS for a memory map and stores its result in (something like) a linked list. However, this list may not be complete, can have contradictory entries and does not take the location of your kernel or any boot modules into account. (Anyways, it is still the best memory map you will have in StuBS...)

Note: Needs to be enabled explicitly by setting the MULTIBOOT_MEMORY_INFO flag in the multiboot header (see boot/multiboot/config.inc)!

See also: Detecting Memory

Member Enumeration Documentation

◆ Type

enum Multiboot::Memory::Type : uint32_t

private

Usage Type.

Enumerator
AVAILABLE	Memory is available and usable in kernel.
RESERVED	Memory is reserved (without further explanation)
ACPI	Memory may be reclaimed by ACPI.
NVS	Memory is non volatile storage for ACPI.
BADRAM	Area contains bad memory.

Member Function Documentation

◆ getEndAddress()

void * Multiboot::Memory::getEndAddress ( ) const

Get end of this memory area.

Returns: Pointer beyond the physical address of this memory area

◆ getNext()

Memory * Multiboot::Memory::getNext ( ) const

Get the next memory area.

Returns: pointer to the next memory area entry

◆ getStartAddress()

void * Multiboot::Memory::getStartAddress ( ) const

Get start of this memory area.

Returns: Pointer to begin of the physical address of the memory area

◆ isAvailable()

bool Multiboot::Memory::isAvailable ( ) const

Is the memory marked as usable.

Returns: true if available, false if not usable.

The documentation for this class was generated from the following files:

boot/multiboot/data.h
boot/multiboot/data.cc

Public Member Functions

Private Types

Private Attributes