1 /*
2 * Copyright (c) 2014 Travis Geiselbrecht
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 #include <kernel/vm.h>
24 #include "vm_priv.h"
25
26 #include <assert.h>
27 #include <stdint.h>
28 #include <stdlib.h>
29 #include <sys/types.h>
30 #include <trace.h>
31
32 #define LOCAL_TRACE 0
33
34 /* cheezy allocator that chews up space just after the end of the kernel mapping */
35
36 /* track how much memory we've used */
37 extern int _end;
38
39 uintptr_t boot_alloc_start = (uintptr_t) &_end;
40 uintptr_t boot_alloc_end = (uintptr_t) &_end;
41
boot_alloc_memalign(size_t len,size_t alignment)42 void *boot_alloc_memalign(size_t len, size_t alignment)
43 {
44 uintptr_t ptr;
45
46 /* boot_alloc_end == 0 indicates we should no longer use this allocator */
47 ASSERT(boot_alloc_end);
48
49 ptr = align(boot_alloc_end, alignment);
50 boot_alloc_end = (ptr + align(len, alignment));
51
52 LTRACEF("len %zu, ptr %p\n", len, (void *)ptr);
53
54 return (void *)ptr;
55 }
56
boot_alloc_mem(size_t len)57 void *boot_alloc_mem(size_t len)
58 {
59 return boot_alloc_memalign(len, 8);
60 }
61