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/* SPDX-License-Identifier: GPL-3.0-or-later */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
#ifndef APOS_PMEM_H
#define APOS_PMEM_H
/**
* @file pmem.h
* Physical memory subsystem. Used to allocate and free physical memory pages.
*/
#include <apos/mem.h>
#include <apos/types.h>
#include <arch/pmem.h>
/**
* Free physical page.
*
* @param order Order of page to free.
* @param addr Physical address of page.
*/
void free_page(enum mm_order order, pm_t addr);
/**
* Mark page used.
*
* @param order Order of page to mark.
* @param addr Physical address of page.
*/
void mark_used(enum mm_order order, pm_t addr);
/**
* Allocate physical page.
* Allows the user to specify a hint as to which address to start looking for.
* Useful for allocating many pages for one virtual allocation, for example, and
* allows us to skip already checked pages when allocating a second page.
*
* @param order Order of page to allocate.
* @return pm_t Physical address of page when succesful, else \c NULL.
*/
pm_t alloc_page(enum mm_order order);
/**
* Populate physical RAM usage map.
* In theory we could easily implement NUMA nodes by just using different orders
* of usage maps, but for now we assume all RAM is contiguous.
*
* @param ram_base Base physical address of RAM.
* @param ram_size Size of phsyical RAM.
* @param cont Physical address where to place the map.
* @return Size of physical map. Check that is matches with \ref probe_pmap().
*/
pm_t populate_pmap(pm_t ram_base, size_t ram_size, pm_t cont);
/**
* Probe size of RAM usage map.
*
* @param ram_size Size of physical RAM.
* @return Size of physical map. Check that it matches with \ref
* populate_pmap().
*/
pm_t probe_pmap(size_t ram_size);
/**
* Initialize physical memory subsystem.
*
* @param fdt Global FDT pointer.
*/
void init_pmem(void *fdt);
#endif /* APOS_PMEM_H */
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