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89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
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/*
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* Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "se_detect.h"
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#include "cpuid.h"
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bool is_se_supported()
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{
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int cpu_info[4] = {0, 0, 0, 0};
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__cpuidex(cpu_info, CPUID_FEATURE_FLAGS, 0);
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if (!(cpu_info[1] & (1<<SE_FEATURE_SHIFT)))
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{
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return false;
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}
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__cpuidex(cpu_info, SE_LEAF, 0);
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if(!(cpu_info[0] & (1 << SE1_SHIFT)))
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return false;
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return true;
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}
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#include "read_xcr0.h"
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bool try_read_xcr0(uint64_t *value)
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{
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//check if xgetbv instruction is supported
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int cpu_info[4] = {0, 0, 0, 0};
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__cpuid(cpu_info, 1);
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if(!(cpu_info[2] & (1<<XSAVE_SHIFT)) || !(cpu_info[2] & (1<<OSXSAVE_SHIFT))) //ecx[27:26] indicate whether supoort xsave/xrstor, and whether enable xgetbv, xsetbv
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return false;
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*value = read_xcr0();
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return true;
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}
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bool get_plat_cap_by_cpuid(sgx_misc_attribute_t *se_misc_attr)
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{
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int cpu_info[4] = {0, 0, 0, 0};
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if(!is_se_supported())
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return false;
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__cpuidex(cpu_info, SE_LEAF, 1);
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//enclave capability
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se_misc_attr->secs_attr.flags = ((uint64_t)cpu_info[1] << 32) | cpu_info[0];
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if(false == try_read_xcr0(&se_misc_attr->secs_attr.xfrm))
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{
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se_misc_attr->secs_attr.xfrm = SGX_XFRM_LEGACY;
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}
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//If x-feature is supported and enabled by OS, we need make sure it is also supported in se.
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else
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{
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se_misc_attr->secs_attr.xfrm &= (((uint64_t)cpu_info[3] << 32) | cpu_info[2]);
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}
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// use cpuid to get the misc_select
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__cpuidex(cpu_info, SE_LEAF, 0);
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se_misc_attr->misc_select = cpu_info[1];
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return true;
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}
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