vmmngr.c File Reference

#include <Mm/vmmngr.h>
#include <aucon.h>
#include <Mm/pmmngr.h>
#include <Hal/AA64/aa64lowlevel.h>
#include <string.h>
#include <kernelAA64.h>
#include <_null.h>
#include <Drivers/uart.h>

Include dependency graph for vmmngr.c:

Functions
void	envmdebug ()
void	AuVmmngrInitialize ()
	AuVmmngrInitialize – initialize the virtual memory manager.
bool	AuMapPage (uint64_t phys_addr, uint64_t virt_addr, uint8_t attrib)
	AuMapPage – Maps a virtual page to physical frame.
bool	AuMapPageEx (uint64_t *pml4i, uint64_t phys_addr, uint64_t virt_addr, uint8_t attrib)
	AuMapPageEx – Maps a virtual page to physical frame in given page level.
AuVPage *	AuVmmngrGetPage (uint64_t virt_addr, uint8_t _flags, uint8_t mode)
void *	AuMapMMIO (uint64_t phys_addr, size_t page_count)
	AuMapMMIO – Maps Memory Mapped I/O addresses.
uint64_t *	AuGetFreePage (bool user, void *ptr)
	AuGetFreePage – Checks for free page.
void	AuFreePages (uint64_t virt_addr, bool free_physical, size_t s)
	AuFreePages – frees up contiguous pages.
void	AuUpdatePageFlags (uint64_t virt_addr, uint64_t flags)
	AuFreePages – frees up contiguous pages.
void *	AuGetPhysicalAddress (uint64_t virt_addr)
	AuGetPhysicalAddress – returns the physical address from a virtual address.
uint64_t *	AuCreateVirtualAddressSpace ()
	AuCreateVirtualAddressSpace – create a new virtual address space.
uint64_t *	AuGetRootPageTable ()
void	AuConsoleFlushFramebuffer ()
void	AuVmmngrBootFree ()

Variables
uint64_t *	_RootPaging
uint64_t *	_RootPagingKe
uint64_t *	_MMIOBase
bool	_vmdebug = 0

Detailed Description

BSD 2-Clause License

Copyright (c) 2023-2025, 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.

Function Documentation

AuConsoleFlushFramebuffer()

void AuConsoleFlushFramebuffer ( )

extern

AuCreateVirtualAddressSpace()

uint64_t * AuCreateVirtualAddressSpace

(

)

AuCreateVirtualAddressSpace – create a new virtual address space.

Returns

pointer to newly created address space

AuFreePages()

void AuFreePages	(	uint64_t	virt_addr,
		bool	free_physical,
		size_t	s
	)

AuFreePages – frees up contiguous pages.

Parameters

virt_addr	– starting virtual address
free_physical	– free up physical frame
size_t	s – size of area to be freed

AuGetFreePage()

uint64_t * AuGetFreePage	(	bool	user,
		void *	ptr
	)

AuGetFreePage – Checks for free page.

Parameters

user	– specifies if it needs to look from user base address
ptr	– if it is non-null, than lookup begins from given pointer

Returns

pointer to free virtual page

AuGetPhysicalAddress()

void * AuGetPhysicalAddress

(

uint64_t

virt_addr

)

AuGetPhysicalAddress – returns the physical address from a virtual address.

Parameters

virt_addr

– Virtual address

Returns

the physical address of respected virtual address

AuGetRootPageTable()

uint64_t * AuGetRootPageTable

(

)

AuMapMMIO()

void * AuMapMMIO	(	uint64_t	phys_addr,
		size_t	page_count
	)

AuMapMMIO – Maps Memory Mapped I/O addresses.

Parameters

phys_addr	– MMIO physical address
page_count	– number of pages

Returns

Pointer to newly mapped virtual mmio address

AuMapPage()

bool AuMapPage	(	uint64_t	phys_addr,
		uint64_t	virt_addr,
		uint8_t	attrib
	)

AuMapPage – Maps a virtual page to physical frame.

Parameters

phys_addr	– physical address
virt_addr	– virtual address
attrib	– Page attributes

Returns

1 on success 0 on failure

AuMapPageEx()

bool AuMapPageEx	(	uint64_t *	pml4i,
		uint64_t	phys_addr,
		uint64_t	virt_addr,
		uint8_t	attrib
	)

AuMapPageEx – Maps a virtual page to physical frame in given page level.

Parameters

pml4i	– root page level pointer
phys_addr	– physical address
virt_addr	– virtual address
attrib	– Page attributes

Returns

1 on success, 0 on failure

AuUpdatePageFlags()

void AuUpdatePageFlags	(	uint64_t	virt_addr,
		uint64_t	flags
	)

AuFreePages – frees up contiguous pages.

Parameters

virt_addr	– starting virtual address
flags	– flags to update

AuVmmngrBootFree()

void AuVmmngrBootFree

(

)

@breif AuVmmngrBootFree – free up the lower half of kernel address space

AuVmmngrGetPage()

AuVPage * AuVmmngrGetPage	(	uint64_t	virt_addr,
		uint8_t	_flags,
		uint8_t	mode
	)

@breif AuVmmngrGetPage – Returns virtual page from virtual address in AuVPage format

Parameters

virt_addr	– Virtual address
_flags	– extra virtual page flags, this is set only if mode is set to VMMNGR_GETPAGE_CREATE
mode	– specifies whether to create a virtual page if its not present

Returns

virtual page from virtual address in AuVPage format

AuVmmngrInitialize()

void AuVmmngrInitialize

(

)

AuVmmngrInitialize – initialize the virtual memory manager.

envmdebug()

void envmdebug

(

)

Variable Documentation

_MMIOBase

uint64_t* _MMIOBase

_RootPaging

uint64_t* _RootPaging

_RootPagingKe

uint64_t* _RootPagingKe

_vmdebug

bool _vmdebug = 0