49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2016, Michael Ellerman, IBM Corp.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <asm/cputable.h>
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#include "utils.h"
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#define SIZE (64 * 1024)
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int test_prot_sao(void)
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{
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char *p;
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/*
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* SAO was introduced in 2.06 and removed in 3.1. It's disabled in
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* guests/LPARs by default, so also skip if we are running in a guest.
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*/
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SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06) ||
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have_hwcap2(PPC_FEATURE2_ARCH_3_1) ||
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access("/proc/device-tree/rtas/ibm,hypertas-functions", F_OK) == 0);
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/*
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* Ensure we can ask for PROT_SAO.
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* We can't really verify that it does the right thing, but at least we
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* confirm the kernel will accept it.
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*/
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p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO,
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MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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FAIL_IF(p == MAP_FAILED);
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/* Write to the mapping, to at least cause a fault */
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memset(p, 0xaa, SIZE);
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return 0;
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}
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int main(void)
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{
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return test_harness(test_prot_sao, "prot-sao");
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}
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