62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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// Copyright (c) 2023 Apple Inc. All rights reserved.
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//
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// @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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//
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// This file contains Original Code and/or Modifications of Original Code
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// as defined in and that are subject to the Apple Public Source License
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// Version 2.0 (the 'License'). You may not use this file except in
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// compliance with the License. The rights granted to you under the License
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// may not be used to create, or enable the creation or redistribution of,
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// unlawful or unlicensed copies of an Apple operating system, or to
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// circumvent, violate, or enable the circumvention or violation of, any
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// terms of an Apple operating system software license agreement.
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//
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// Please obtain a copy of the License at
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// http://www.opensource.apple.com/apsl/ and read it before using this file.
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//
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// The Original Code and all software distributed under the License are
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// distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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// EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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// INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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// Please see the License for the specific language governing rights and
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// limitations under the License.
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//
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// @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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#include <kern/cpc.h>
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#include <sys/sysctl.h>
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SYSCTL_NODE(_kern, OID_AUTO, cpc, CTLFLAG_RD, 0,
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"CPU Performance Counters subsystem");
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static int
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_cpc_sysctl_secure SYSCTL_HANDLER_ARGS
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{
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int enforced = cpc_is_secure();
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int changed = 0;
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int error = sysctl_io_number(req, enforced, sizeof(enforced), &enforced,
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&changed);
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if (error != 0) {
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return error;
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}
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if (changed) {
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#if CPC_INSECURE
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cpc_change_security(enforced);
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#else // CPC_INSECURE
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return EPERM;
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#endif // !CPC_INSECURE
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}
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return 0;
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}
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#if CPC_INSECURE
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#define CPC_SYSCTL_SECURE_PROT CTLFLAG_RW
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#else // CPC_INSECURE
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#define CPC_SYSCTL_SECURE_PROT CTLFLAG_RD
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#endif // !CPC_INSECURE
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SYSCTL_PROC(_kern_cpc, OID_AUTO, secure, CPC_SYSCTL_SECURE_PROT | CTLTYPE_INT,
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0, 0, _cpc_sysctl_secure, "I",
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"Whether the CPU Performance Counters system is operating securely.");
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