kalloc.h File Reference

#include <stddef.h>
#include <stdint.h>

Go to the source code of this file.

Macros
#define	ALIGNMENT_MASK(x, a)   ((typeof(x))(a) - 1)
	Aligns the given value x up to the nearest multiple of a.
#define	ALIGN_UP(x, a)   (((x) + ALIGNMENT_MASK(x, a)) & ~ALIGNMENT_MASK(x, a))
	Aligns the given value x up to the nearest multiple of a.
#define	ALIGN_DOWN(x, a)   ((x) & ~ALIGNMENT_MASK(x, a))
	Aligns the given value x down to the nearest multiple of a.
#define	PAGE_SIZE   4096
	The size of a memory page in bytes.

Functions
size_t	page_align_up (size_t addr)
	Rounds up the given address to the nearest page boundary.
size_t	page_align_down (size_t addr)
	Rounds down the given address to the nearest page boundary.
void	kalloc_init (void)
	Initializes the kernel memory allocator.
void *	hhdm_physical_to_virtual (size_t phys)
	Converts a physical address to a virtual address according to the Higher Half Direct Mapping (HHDM) scheme.
size_t	hhdm_virtual_to_physical (void *virt)
	Converts a virtual address to a physical address according to the Higher Half Direct Mapping (HHDM) scheme.

Macro Definition Documentation

ALIGN_DOWN

#define ALIGN_DOWN	(		x,
			a
	)		((x) & ~ALIGNMENT_MASK(x, a))

Aligns the given value x down to the nearest multiple of a.

Parameters

x	The value to align.
a	The alignment boundary.

Returns

The aligned value.

ALIGN_UP

#define ALIGN_UP	(		x,
			a
	)		(((x) + ALIGNMENT_MASK(x, a)) & ~ALIGNMENT_MASK(x, a))

Aligns the given value x up to the nearest multiple of a.

Parameters

x	The value to align.
a	The alignment boundary.

Returns

The aligned value.

ALIGNMENT_MASK

#define ALIGNMENT_MASK	(		x,
			a
	)		((typeof(x))(a) - 1)

Aligns the given value x up to the nearest multiple of a.

Parameters

x	The value to align.
a	The alignment boundary.

Returns

The aligned value.

PAGE_SIZE

#define PAGE_SIZE   4096

The size of a memory page in bytes.

Function Documentation

hhdm_physical_to_virtual()

void * hhdm_physical_to_virtual

(

size_t

phys

)

Converts a physical address to a virtual address according to the Higher Half Direct Mapping (HHDM) scheme.

Parameters

phys	The physical address to convert.

Returns

The virtual address.

hhdm_virtual_to_physical()

size_t hhdm_virtual_to_physical

(

void *

virt

)

Converts a virtual address to a physical address according to the Higher Half Direct Mapping (HHDM) scheme.

Parameters

virt	The virtual address to convert.

Returns

The physical address.

kalloc_init()

void kalloc_init

(

void

)

Initializes the kernel memory allocator.

page_align_down()

size_t page_align_down

(

size_t

addr

)

Rounds down the given address to the nearest page boundary.

Parameters

addr	The address to align.

Returns

The aligned address.

page_align_up()

size_t page_align_up

(

size_t

addr

)

Rounds up the given address to the nearest page boundary.

Parameters

addr	The address to align.

Returns

The aligned address.