pmem.c File Reference

#include "cpu/arch_consts.h"
#include "cpu/halt.h"
#include "vga_err.h"
#include <grub/multiboot2.h>
#include <stdint.h>
#include <stdlib.h>

Macros
#define	BMAP_LEN   (NUM_FRAMES/8)
	The size of the physical memory manager's bitmap.

Functions
static char	get_bmap_bit (int index)
static void	set_bmap_bit (int index)
static void	clear_bmap_bit (int index)
void	pmem_init (struct multiboot_boot_header_tag *tags)
void *	pmem_alloc (int num_pages)
void	pmem_free (void *start, int num_pages)

Variables
static char	bmap [BMAP_LEN]
	Bitmap of allocated/non-present page frames.

Function Documentation

clear_bmap_bit()

static void clear_bmap_bit ( int  index )

static

Clear a bit in the heap bitmap

Parameters

index

The bit to clear

get_bmap_bit()

static char get_bmap_bit ( int  index )

static

Get a bit in the bitmap

Parameters

index

The bit to get

Returns

the bit

pmem_alloc()

void* pmem_alloc

(

int

num_pages

)

Allocate physical frames

Parameters

num_pages

The number of frames to allocate

Returns

the physical address of the allocated frames

pmem_free()

void pmem_free	(	void *	start,
		int	num_pages
	)

Free allocated physical frames

Parameters

start	The address to start freeing at.
num_pages	The number of frames to free

pmem_init()

void pmem_init

(

struct multiboot_boot_header_tag *

tags

)

Initialize the physical memory manager

Parameters

tags	The multiboot header

set_bmap_bit()

static void set_bmap_bit ( int  index )

static

Set a bit in the heap bitmap

Parameters

index

The bit to set