1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2016, Michael Ellerman, IBM Corp.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <stdio.h>
7*4882a593Smuzhiyun #include <stdlib.h>
8*4882a593Smuzhiyun #include <string.h>
9*4882a593Smuzhiyun #include <sys/mman.h>
10*4882a593Smuzhiyun #include <unistd.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <asm/cputable.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include "utils.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define SIZE (64 * 1024)
17*4882a593Smuzhiyun
test_prot_sao(void)18*4882a593Smuzhiyun int test_prot_sao(void)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun char *p;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * SAO was introduced in 2.06 and removed in 3.1. It's disabled in
24*4882a593Smuzhiyun * guests/LPARs by default, so also skip if we are running in a guest.
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06) ||
27*4882a593Smuzhiyun have_hwcap2(PPC_FEATURE2_ARCH_3_1) ||
28*4882a593Smuzhiyun access("/proc/device-tree/rtas/ibm,hypertas-functions", F_OK) == 0);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /*
31*4882a593Smuzhiyun * Ensure we can ask for PROT_SAO.
32*4882a593Smuzhiyun * We can't really verify that it does the right thing, but at least we
33*4882a593Smuzhiyun * confirm the kernel will accept it.
34*4882a593Smuzhiyun */
35*4882a593Smuzhiyun p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO,
36*4882a593Smuzhiyun MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
37*4882a593Smuzhiyun FAIL_IF(p == MAP_FAILED);
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun /* Write to the mapping, to at least cause a fault */
40*4882a593Smuzhiyun memset(p, 0xaa, SIZE);
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun return 0;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
main(void)45*4882a593Smuzhiyun int main(void)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun return test_harness(test_prot_sao, "prot-sao");
48*4882a593Smuzhiyun }
49