Defines a VirtualMemoryManager class for managing virtual memory allocation and mapping to physical memory. More...

#include <stdint.h>
#include <stddef.h>
#include <libcommon/string.h>
#include <memory/physical.h>

Classes
struct	MaxOS::memory::VirtualMemoryChunk
	A container for a region of virtual memory that has been allocated by the Virtual Memory Manager. More...

struct	MaxOS::memory::FreeChunk
	A chunk of memory that has been freed and is available for allocation. A node in a linked list. More...

struct	MaxOS::memory::VirtualMemoryRegion
	A region of virtual memory containing multiple chunks (should fit in one page). More...

class	MaxOS::memory::VirtualMemoryManager
	Manages the virtual memory of the system and provides functions to allocate and free memory in the virtual address space. More...

Typedefs
typedef enum MaxOS::memory::VirtualFlags	MaxOS::memory::virtual_flags_t
	Alias for VirtualFlags enum.

typedef struct MaxOS::memory::VirtualMemoryChunk	MaxOS::memory::virtual_memory_chunk_t
	Alias for VirtualMemoryChunk struct.

typedef struct MaxOS::memory::FreeChunk	MaxOS::memory::free_chunk_t
	Alias for FreeChunk struct.

typedef struct PACKED MaxOS::memory::VirtualMemoryRegion	MaxOS::memory::virtual_memory_region_t
	Alias for VirtualMemoryRegion struct.

Enumerations
enum	MaxOS::memory::VirtualFlags { MaxOS::memory::RESERVE = (1 << 9) , MaxOS::memory::SHARED = (1 << 10) }
	Flags for chunks used in virtual memory allocation. More...

Variables
constexpr size_t	MaxOS::memory::CHUNKS_PER_PAGE = PAGE_SIZE / sizeof(virtual_memory_chunk_t) - 1
	Number of chunks per virtual memory region (limited to fit in one page)

constexpr size_t	MaxOS::memory::VMM_RESERVED = 0x138000000
	The starting address for the VMM to start allocating from when in higher half (otherwise can cause conflicts with kernel space)

Detailed Description

Defines a VirtualMemoryManager class for managing virtual memory allocation and mapping to physical memory.

Date: 11th February 2024

Author: Max Tyson

Definition in file virtual.h.

Typedef Documentation

◆ free_chunk_t

MaxOS::memory::free_chunk_t

Alias for FreeChunk struct.

Todo:: Could just use virtual_memory_chunk_t and use "flags" as a pointer?

◆ virtual_flags_t

MaxOS::memory::virtual_flags_t

Alias for VirtualFlags enum.

See also: PageFlags

Note: 0 - (1 << 8) are reserved for the page flags

◆ virtual_memory_chunk_t

MaxOS::memory::virtual_memory_chunk_t

Alias for VirtualMemoryChunk struct.

See also: VirtualFlags

◆ virtual_memory_region_t

MaxOS::memory::virtual_memory_region_t

Alias for VirtualMemoryRegion struct.

Note: This stores the metadata for the chunks, not the actual memory they represent. (ie chunks are not slices of this region)

Enumeration Type Documentation

◆ VirtualFlags

enum MaxOS::memory::VirtualFlags

Flags for chunks used in virtual memory allocation.

Enumerator
RESERVE	Reserve the memory but do not map any physical memory to it.
SHARED	The memory is shared between multiple processes.

Definition at line 38 of file virtual.h.

                                  {
 
            RESERVE = (1 << 9),         
            SHARED = (1 << 10),         
 
        } virtual_flags_t;

Variable Documentation

◆ CHUNKS_PER_PAGE

constexpr size_t MaxOS::memory::CHUNKS_PER_PAGE = PAGE_SIZE / sizeof(virtual_memory_chunk_t) - 1

constexpr

Number of chunks per virtual memory region (limited to fit in one page)

Definition at line 79 of file virtual.h.

Referenced by MaxOS::memory::VirtualMemoryManager::allocate(), MaxOS::memory::VirtualMemoryManager::free(), MaxOS::memory::VirtualMemoryManager::memory_used(), and MaxOS::memory::VirtualMemoryManager::~VirtualMemoryManager().

◆ VMM_RESERVED

constexpr size_t MaxOS::memory::VMM_RESERVED = 0x138000000

constexpr

The starting address for the VMM to start allocating from when in higher half (otherwise can cause conflicts with kernel space)

Definition at line 80 of file virtual.h.

Referenced by MaxOS::memory::VirtualMemoryManager::VirtualMemoryManager().

Classes

Typedefs

Enumerations

Variables