pmmngr.c File Reference

#include <Mm/pmmngr.h>
#include <Hal/AA64/aa64lowlevel.h>
#include <Mm/vmmngr.h>
#include <Drivers/uart.h>
#include <efi.h>

Include dependency graph for pmmngr.c:

Classes
struct	_lb_mem_rgn_

Macros
#define	PAGE_SHIFT   12

Typedefs
typedef struct _lb_mem_rgn_	LBMemoryRegion

Functions
void	AuPmmngrInitBitmap (size_t BSize, void *Buffer)
	AuPmmngrInitBitmap – Initialize the Ram bitmap with all zeros.
bool	AuPmmngrBitmapCheck (uint64_t index)
bool	AuPmmngrBitmapSet (uint64_t index, bool value)
void	AuPmmngrLockPage (uint64_t Address)
	AuPmmngrLockPage – Lock a given page.
void	AuPmmngrLockPages (void *Address, size_t Size)
	AuPmmngrLockPage – locks a set of pages.
void	AuPmmngrUnreservePage (void *Address)
	AuPmmngrUnreservePage – Marks a page as free.
void	AuPmmngrInitialize (KERNEL_BOOT_INFO *info)
	AuPmmngrInitialise – initialise the physical memory manager.
bool	AuPmmngrAllocCheck (uint64_t address)
void *	AuPmmngrAlloc ()
	AuPmmngrAlloc – Allocate a single physical page frame and return it to the caller.
void *	AuPmmngrAllocBlocks (int num)
	AuPmmngrAllocBlocks – Allocate multiple physical page frames and return the first page pointer to the caller.
void	AuPmmngrFree (void *Address)
	AuPmmngrFree – Free a physical page frame.
void	AuPmmngrFreeBlocks (void *Addr, int Count)
	AuPmmngrFreeBlocks – Free multiple page frames.
uint64_t	P2V (uint64_t addr)
	P2V – Physical to Virtual conversion.
uint64_t	V2P (uint64_t vaddr)
	V2P – Virtual to Physical conversion.
void	AuPmmngrMoveHigher ()
	AuPmmngrMoveHigher – moves the kernel to higher half of memory.
uint64_t	AuPmmngrGetFreeMem ()
	AuPmmngrGetFreeMem – returns the total free amount of RAM.
uint64_t	AuPmmngrGetTotalMem ()
	AuPmmngrGetTotalMem – returns the total amount of RAM.

Variables
uint64_t	_FreeMemory
uint64_t	_ReservedMemory
uint64_t	_UsedMemory
uint64_t	_RamBitmapIndex
uint64_t	_TotalRam
uint64_t	UsablePhysicalMemory
uint64_t	_BitmapSize
bool	_HigherHalf
bool	debugon
uint8_t *	BitmapBuffer

Detailed Description

BSD 2-Clause License

Copyright (c) 2022-2025, Manas Kamal Choudhury All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Macro Definition Documentation

PAGE_SHIFT

#define PAGE_SHIFT   12

Typedef Documentation

LBMemoryRegion

typedef struct _lb_mem_rgn_ LBMemoryRegion

Function Documentation

AuPmmngrAlloc()

void * AuPmmngrAlloc

(

)

AuPmmngrAlloc – Allocate a single physical page frame and return it to the caller.

AuPmmngrAllocBlocks()

void * AuPmmngrAllocBlocks

(

int

num

)

AuPmmngrAllocBlocks – Allocate multiple physical page frames and return the first page pointer to the caller.

Parameters

size	– Number of blocks to allocate

AuPmmngrAllocCheck()

bool AuPmmngrAllocCheck

(

uint64_t

address

)

AuPmmngrBitmapCheck()

bool AuPmmngrBitmapCheck

(

uint64_t

index

)

AuPmmngrBitmapSet()

bool AuPmmngrBitmapSet	(	uint64_t	index,
		bool	value
	)

AuPmmngrFree()

void AuPmmngrFree

(

void *

Address

)

AuPmmngrFree – Free a physical page frame.

Parameters

Address

– Pointer to physical page

AuPmmngrFreeBlocks()

void AuPmmngrFreeBlocks	(	void *	Addr,
		int	Count
	)

AuPmmngrFreeBlocks – Free multiple page frames.

Parameters

Addr	– Address of the first page frame
Count	– Number of blocks to be freed

AuPmmngrGetFreeMem()

uint64_t AuPmmngrGetFreeMem

(

)

AuPmmngrGetFreeMem – returns the total free amount of RAM.

AuPmmngrGetTotalMem()

uint64_t AuPmmngrGetTotalMem

(

)

AuPmmngrGetTotalMem – returns the total amount of RAM.

AuPmmngrInitBitmap()

void AuPmmngrInitBitmap	(	size_t	BSize,
		void *	Buffer
	)

AuPmmngrInitBitmap – Initialize the Ram bitmap with all zeros.

Parameters

BitmapSize	– total bitmap size
Buffer	– Pointer to bitmap buffer

AuPmmngrInitialize()

void AuPmmngrInitialize

(

KERNEL_BOOT_INFO *

info

)

AuPmmngrInitialise – initialise the physical memory manager.

Parameters

info	– Pointer to kernel boot info structure

AuPmmngrLockPage()

void AuPmmngrLockPage

(

uint64_t

Address

)

AuPmmngrLockPage – Lock a given page.

Parameters

Address

– Pointer to page

AuPmmngrLockPages()

void AuPmmngrLockPages	(	void *	Address,
		size_t	Size
	)

AuPmmngrLockPage – locks a set of pages.

Parameters

Address	– Starting address of the first page
Size	– Size of the set

AuPmmngrMoveHigher()

void AuPmmngrMoveHigher

(

)

AuPmmngrMoveHigher – moves the kernel to higher half of memory.

AuPmmngrUnreservePage()

void AuPmmngrUnreservePage

(

void *

Address

)

AuPmmngrUnreservePage – Marks a page as free.

Parameters

Address

– Pointer to the page

P2V()

uint64_t P2V

(

uint64_t

addr

)

P2V – Physical to Virtual conversion.

Parameters

addr	– Address to convert

V2P()

uint64_t V2P

(

uint64_t

vaddr

)

V2P – Virtual to Physical conversion.

Parameters

vaddr

– Address to convert

Variable Documentation

_BitmapSize

uint64_t _BitmapSize

_FreeMemory

uint64_t _FreeMemory

_HigherHalf

bool _HigherHalf

_RamBitmapIndex

uint64_t _RamBitmapIndex

_ReservedMemory

uint64_t _ReservedMemory

_TotalRam

uint64_t _TotalRam

_UsedMemory

uint64_t _UsedMemory

BitmapBuffer

uint8_t* BitmapBuffer

debugon

bool debugon

UsablePhysicalMemory

uint64_t UsablePhysicalMemory