1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef _TESTCASES_MMAP_TEST_H
3 #define _TESTCASES_MMAP_TEST_H
4 #include <sys/mman.h>
5 #include <sys/resource.h>
6 #include <stddef.h>
7
8 #define TOP_DOWN 0
9 #define BOTTOM_UP 1
10
11 struct addresses {
12 int *no_hint;
13 int *on_37_addr;
14 int *on_38_addr;
15 int *on_46_addr;
16 int *on_47_addr;
17 int *on_55_addr;
18 int *on_56_addr;
19 };
20
21 // Only works on 64 bit
22 #if __riscv_xlen == 64
do_mmaps(struct addresses * mmap_addresses)23 static inline void do_mmaps(struct addresses *mmap_addresses)
24 {
25 /*
26 * Place all of the hint addresses on the boundaries of mmap
27 * sv39, sv48, sv57
28 * User addresses end at 1<<38, 1<<47, 1<<56 respectively
29 */
30 void *on_37_bits = (void *)(1UL << 37);
31 void *on_38_bits = (void *)(1UL << 38);
32 void *on_46_bits = (void *)(1UL << 46);
33 void *on_47_bits = (void *)(1UL << 47);
34 void *on_55_bits = (void *)(1UL << 55);
35 void *on_56_bits = (void *)(1UL << 56);
36
37 int prot = PROT_READ | PROT_WRITE;
38 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
39
40 mmap_addresses->no_hint =
41 mmap(NULL, 5 * sizeof(int), prot, flags, 0, 0);
42 mmap_addresses->on_37_addr =
43 mmap(on_37_bits, 5 * sizeof(int), prot, flags, 0, 0);
44 mmap_addresses->on_38_addr =
45 mmap(on_38_bits, 5 * sizeof(int), prot, flags, 0, 0);
46 mmap_addresses->on_46_addr =
47 mmap(on_46_bits, 5 * sizeof(int), prot, flags, 0, 0);
48 mmap_addresses->on_47_addr =
49 mmap(on_47_bits, 5 * sizeof(int), prot, flags, 0, 0);
50 mmap_addresses->on_55_addr =
51 mmap(on_55_bits, 5 * sizeof(int), prot, flags, 0, 0);
52 mmap_addresses->on_56_addr =
53 mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0);
54 }
55 #endif /* __riscv_xlen == 64 */
56
memory_layout(void)57 static inline int memory_layout(void)
58 {
59 int prot = PROT_READ | PROT_WRITE;
60 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
61
62 void *value1 = mmap(NULL, sizeof(int), prot, flags, 0, 0);
63 void *value2 = mmap(NULL, sizeof(int), prot, flags, 0, 0);
64
65 return value2 > value1;
66 }
67 #endif /* _TESTCASES_MMAP_TEST_H */
68