dtb.c File Reference

#include <dtb.h>
#include <aucon.h>
#include <_null.h>
#include <string.h>
#include <Mm/vmmngr.h>
#include <Mm/pmmngr.h>

Include dependency graph for dtb.c:

Macros
#define	FDT_MAGIC   0xd00dfeed
#define	FDT_BEGIN_NODE   0x1
#define	FDT_END_NODE   0x2
#define	FDT_PROP   0x3
#define	FDT_NOP   0x4
#define	FDT_END   0x9

Functions
uint32_t	AuDTBSwap32 (uint32_t from)
	AuDTBSwap32 – swaps 32 bit value.
uint64_t	AuDTBSwap64 (uint64_t from)
	AuDTBSwap64 – swaps 64 bit value.
uint16_t	AuDTBSwap16 (uint16_t from)
	AuDTBSwap16 – swaps 16 bit value.
uint32_t *	AuDeviceTreeGetSubNode (uint32_t *node, char *strings, const char *name, uint32_t **node_out, int(*cmp)(const char *a, const char *b))
uint32_t *	AuDeviceTreeFindPropertyInternal (uint32_t *node, char *strings, const char *property, uint32_t **out)
uint32_t *	AuDeviceTreeGetNode (const char *name)
	AuDeviceTreeGetNode – searches and get the offset of the node.
uint32_t *	AuDeviceTreeFindProperty (uint32_t *node, const char *property)
	AuDeviceTreeFindProperty – searches for a property within a node.
uint32_t	AuDeviceTreeGetAddressCells (uint32_t *node)
	AuDeviceTreeGetAddressCells – get the value from address cells property.
uint32_t	AuDeviceTreeGetSizeCells (uint32_t *node)
	AuDeviceTreeGetSizeCells – get the value from size cells property.
uint64_t	AuDeviceTreeGetRegAddress (uint32_t *node, uint32_t addressCell)
	AuDeviceTreeGetRegAddress – get the MMIO address from reg property.
uint64_t	AuDeviceTreeGetRegSize (uint32_t *node, uint32_t addressCell, uint32_t sizeCell)
	AuDeviceTreeGetRegSize – get the size value from reg property.
void	AuDeviceTreeInitialize (KERNEL_BOOT_INFO *info)
	AuDeviceTreeInitialize – initialize the device tree.
void	AuDeviceTreeMapMMIO ()
	AuDeviceTreeMapMMIO – Maps the physical device tree address to MMIO address range.

Variables
uint64_t *	dtbAddress

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

FDT_BEGIN_NODE

#define FDT_BEGIN_NODE   0x1

FDT_END

#define FDT_END   0x9

FDT_END_NODE

#define FDT_END_NODE   0x2

FDT_MAGIC

#define FDT_MAGIC   0xd00dfeed

FDT_NOP

#define FDT_NOP   0x4

FDT_PROP

#define FDT_PROP   0x3

Function Documentation

AuDeviceTreeFindProperty()

uint32_t * AuDeviceTreeFindProperty	(	uint32_t *	node,
		const char *	property
	)

AuDeviceTreeFindProperty – searches for a property within a node.

Parameters

node	– Pointer to node offset
property	– Property name

AuDeviceTreeFindPropertyInternal()

uint32_t * AuDeviceTreeFindPropertyInternal	(	uint32_t *	node,
		char *	strings,
		const char *	property,
		uint32_t **	out
	)

AuDeviceTreeGetAddressCells()

uint32_t AuDeviceTreeGetAddressCells

(

uint32_t *

node

)

AuDeviceTreeGetAddressCells – get the value from address cells property.

Parameters

node	– Pointer to node

AuDeviceTreeGetNode()

uint32_t * AuDeviceTreeGetNode

(

const char *

name

)

AuDeviceTreeGetNode – searches and get the offset of the node.

Parameters

name	– Node name

AuDeviceTreeGetRegAddress()

uint64_t AuDeviceTreeGetRegAddress	(	uint32_t *	node,
		uint32_t	addressCell
	)

AuDeviceTreeGetRegAddress – get the MMIO address from reg property.

Parameters

node	– Pointer to parent node
addressCell	– size of address cell

AuDeviceTreeGetRegSize()

uint64_t AuDeviceTreeGetRegSize	(	uint32_t *	node,
		uint32_t	addressCell,
		uint32_t	sizeCell
	)

AuDeviceTreeGetRegSize – get the size value from reg property.

Parameters

node	– Pointer to parent node
addressCell	– size of address cell
sizeCell	– value of size cell

AuDeviceTreeGetSizeCells()

uint32_t AuDeviceTreeGetSizeCells

(

uint32_t *

node

)

AuDeviceTreeGetSizeCells – get the value from size cells property.

Parameters

node	– Pointer to node

AuDeviceTreeGetSubNode()

uint32_t * AuDeviceTreeGetSubNode	(	uint32_t *	node,
		char *	strings,
		const char *	name,
		uint32_t **	node_out,
		int(*)(const char *a, const char *b)	cmp
	)

AuDeviceTreeInitialize()

void AuDeviceTreeInitialize

(

KERNEL_BOOT_INFO *

info

)

AuDeviceTreeInitialize – initialize the device tree.

Parameters

fdt_address

– device tree address passed by bootloader

AuDeviceTreeMapMMIO()

void AuDeviceTreeMapMMIO

(

)

AuDeviceTreeMapMMIO – Maps the physical device tree address to MMIO address range.

AuDTBSwap16()

uint16_t AuDTBSwap16

(

uint16_t

from

)

AuDTBSwap16 – swaps 16 bit value.

Parameters

from	– value to swap

AuDTBSwap32()

uint32_t AuDTBSwap32

(

uint32_t

from

)

AuDTBSwap32 – swaps 32 bit value.

Parameters

from	– value to swap

AuDTBSwap64()

uint64_t AuDTBSwap64

(

uint64_t

from

)

AuDTBSwap64 – swaps 64 bit value.

Parameters

from	– value to swap

Variable Documentation

dtbAddress

uint64_t* dtbAddress