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/*
* Copyright (c) 2010, 2011, 2012 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Physical page allocator.
*/
#ifndef _VM_VM_PHYS_H
#define _VM_VM_PHYS_H
#include <kern/types.h>
#include <vm/vm_page.h>
/*
* True if the vm_phys module is completely initialized, false otherwise
* (in which case only vm_phys_bootalloc() can be used for allocations).
*/
extern int vm_phys_ready;
/*
* Load physical memory into the vm_phys module at boot time.
*
* The avail_start and avail_end parameters are used to maintain a simple
* heap for bootstrap allocations.
*/
void vm_phys_load(const char *name, phys_addr_t start, phys_addr_t end,
phys_addr_t avail_start, phys_addr_t avail_end,
unsigned int seg_index, unsigned int seglist_prio);
/*
* Allocate one physical page.
*
* This function is used to allocate physical memory at boot time, before the
* vm_phys module is ready, but after the physical memory has been loaded.
*/
phys_addr_t vm_phys_bootalloc(void);
/*
* Set up the vm_phys module.
*
* Once this function returns, the vm_phys module is ready, and normal
* allocation functions can be used.
*/
void vm_phys_setup(void);
/*
* Make the given page managed by the vm_phys module.
*
* If additional memory can be made usable after the VM system is initialized,
* it should be reported through this function.
*/
void vm_phys_manage(struct vm_page *page);
/*
* Return the page descriptor for the given physical address.
*/
struct vm_page * vm_phys_lookup_page(phys_addr_t pa);
/*
* Allocate a block of 2^order physical pages.
*/
struct vm_page * vm_phys_alloc(unsigned int order);
/*
* Allocate physical pages from a specific segment.
*
* This function shouldn't only be called by architecture specific functions.
*/
struct vm_page * vm_phys_alloc_seg(unsigned int order, unsigned int seg_index);
/*
* Release a block of 2^order physical pages.
*/
void vm_phys_free(struct vm_page *page, unsigned int order);
/*
* Display internal information about the module.
*/
void vm_phys_info(void);
#endif /* _VM_VM_PHYS_H */
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