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/*
* Copyright (c) 2010-2017 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/>.
*/
#ifndef VM_VM_KMEM_H
#define VM_VM_KMEM_H
#include <stdint.h>
#include <kern/init.h>
#include <machine/pmap.h>
#include <machine/types.h>
/*
* The kernel space is required not to start at address 0, which is used to
* report allocation errors.
*/
#if PMAP_START_KMEM_ADDRESS == 0
#error "kernel space must not start at address 0"
#endif /* PMAP_START_KMEM_ADDRESS == 0 */
/*
* Special kernel addresses.
*/
extern char _text;
extern char _rodata;
extern char _data;
extern char _end;
/*
* Allocate pure virtual kernel pages.
*
* The caller is reponsible for taking care of the underlying physical memory.
*/
void * vm_kmem_alloc_va(size_t size);
/*
* Free virtual kernel pages.
*
* The caller is reponsible for taking care of the underlying physical memory.
*/
void vm_kmem_free_va(void *addr, size_t size);
/*
* Allocate kernel pages.
*/
void * vm_kmem_alloc(size_t size);
/*
* Free kernel pages.
*/
void vm_kmem_free(void *addr, size_t size);
/*
* Map physical memory in the kernel map.
*
* Return the address at which the mapped memory can be accessed. If map_addrp
* and/or map_sizep aren't NULL, they are updated to the address and size of
* the mapping created.
*
* This is a convenience function for modules that must map random regions of
* physical memory, and as such, it doesn't expect a page-aligned input range.
*
* TODO When mapping attributes are implemented, make this function disable
* caching on the mapping.
*/
void * vm_kmem_map_pa(phys_addr_t pa, size_t size,
uintptr_t *map_vap, size_t *map_sizep);
/*
* Unmap physical memory from the kernel map.
*/
void vm_kmem_unmap_pa(uintptr_t map_va, size_t map_size);
/*
* This init operation provides :
* - kernel virtual memory allocation
*/
INIT_OP_DECLARE(vm_kmem_setup);
#endif /* VM_VM_KMEM_H */
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