1 /*
2  * Copyright (c) 2015 Google, Inc. All rights reserved
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining
5  * a copy of this software and associated documentation files
6  * (the "Software"), to deal in the Software without restriction,
7  * including without limitation the rights to use, copy, modify, merge,
8  * publish, distribute, sublicense, and/or sell copies of the Software,
9  * and to permit persons to whom the Software is furnished to do so,
10  * subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be
13  * included in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22  */
23 #ifndef __KERNEL_NOVM_H
24 #define __KERNEL_NOVM_H
25 
26 #include <stddef.h>
27 #include <stdlib.h>
28 #include <arch.h>
29 
30 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
31 #define IS_PAGE_ALIGNED(x) IS_ALIGNED(x, PAGE_SIZE)
32 
33 // arena bitmaps for novm_alloc_pages
34 #define NOVM_ARENA_ANY (UINT32_MAX)
35 #define NOVM_ARENA_MAIN (1<<0)
36 #define NOVM_ARENA_SECONDARY (~NOVM_ARENA_MAIN)
37 
38 void *novm_alloc_pages(size_t pages, uint32_t arena_bitmap);
39 void novm_free_pages(void *address, size_t pages);
40 status_t novm_alloc_specific_pages(void *address, size_t pages);
41 
42 // You can call this once and it will give you some possibly unaligned memory
43 // that would otherwise go to waste.  The memory can't be freed.
44 void *novm_alloc_unaligned(size_t *size_return);
45 
46 void novm_add_arena(const char *name, uintptr_t arena_start, uintptr_t arena_size);
47 
48 struct page_range {
49     void* address;
50     size_t size;
51 };
52 
53 int novm_get_arenas(struct page_range* ranges, int number_of_ranges);
54 
55 #endif
56