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/**
* @file physalloc.h
*
* @author Freya Murphy <freya@freyacat.org>
*
* Physical page allocator functions
*/
#ifndef PHYSALLOC_H_
#define PHYSALLOC_H_
#include <comus/memory.h>
/// Represents some contiguous physical pages
struct phys_page_slice {
void *pagestart;
size_t num_pages;
};
#define PHYS_PAGE_SLICE_NULL \
((struct phys_page_slice){ .pagestart = NULL, .num_pages = 0 })
/**
* Initalize the physical page allocator
*/
void physalloc_init(struct memory_map *map);
/*
* Allocates the first page(s) it finds. Returns a pointer to that page
* and, if there are (up to max_pages) extra pages free after it, it allocates
* them as well.
*
* @param max_pages - the maximum number of pages to mark as allocated
* @returns a slice of all of the allocated pages, num_pages will be
* <= max_pages
*/
struct phys_page_slice alloc_phys_page_withextra(size_t max_pages);
/**
* Allocates a single physical page in memory
* @preturns the physical address of the page
*/
void *alloc_phys_page(void);
/**
* Allocates count contiguous physical pages in memory
* @returns the physical address of the first page, or NULL if no
* contiguous pages exist.
*/
void *alloc_phys_pages_exact(size_t count);
/**
* Frees a single physical page in memory
* @param ptr - the physical address of the page
*/
void free_phys_page(void *ptr);
/**
* Frees count physical pages in memory
* @param ptr - the physical address of the first page
* @param count - the number of pages in the list
*/
void free_phys_pages(void *ptr, size_t count);
/**
* Frees a slice of physical pages in memory
* @param slice - the pages to free
*/
void free_phys_pages_slice(struct phys_page_slice slice);
#endif /* physalloc.h */
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