lowlevel.h File Reference

#include <stdint.h>

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Functions
uint8_t	inportb (uint16_t port)
uint16_t	inportw (uint16_t port)
uint16_t	inportd (uint16_t port)
void	outportb (uint16_t port, uint8_t val)
void	outportw (uint16_t port, uint16_t val)
void	outportd (uint16_t port, uint32_t val)
void	cpuid (size_t page, size_t *a, size_t *b, size_t *c, size_t *d, size_t subpage=0)
void	cacheflush ()
void	tlbflush (void *addr)
void	memory_barrier ()
void *	get_paging_root ()
void	set_paging_root (uint64_t)
void	cpu_startup ()
uint64_t	rdmsr (size_t reg)
void	wrmsr (size_t reg, uint64_t val)
size_t	read_cr0 ()
void	write_cr0 (size_t)
void	call_kernel (void *param, void *entry, void *stack, size_t stacksz)

Function Documentation

cacheflush()

void cacheflush

(

)

call_kernel()

void call_kernel	(	void *	param,
		void *	entry,
		void *	stack,
		size_t	stacksz
	)

cpu_startup()

void cpu_startup

(

)

cpuid()

void cpuid	(	size_t	page,
		size_t *	a,
		size_t *	b,
		size_t *	c,
		size_t *	d,
		size_t	subpage = 0
	)

get_paging_root()

void * get_paging_root

(

)

inportb()

uint8_t inportb

(

uint16_t

port

)

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.

inportd()

uint16_t inportd

(

uint16_t

port

)

inportw()

uint16_t inportw

(

uint16_t

port

)

memory_barrier()

void memory_barrier

(

)

outportb()

void outportb	(	uint16_t	port,
		uint8_t	val
	)

outportd()

void outportd	(	uint16_t	port,
		uint32_t	val
	)

outportw()

void outportw	(	uint16_t	port,
		uint16_t	val
	)

rdmsr()

uint64_t rdmsr

(

size_t

reg

)

read_cr0()

size_t read_cr0

(

)

set_paging_root()

void set_paging_root

(

uint64_t

)

tlbflush()

void tlbflush

(

void *

addr

)

write_cr0()

void write_cr0

(

size_t

)

wrmsr()

void wrmsr	(	size_t	reg,
		uint64_t	val
	)