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51 lines
2.3 KiB
C
51 lines
2.3 KiB
C
/*
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* Copyright (c) 2014 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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*/
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#include <mach/vm_param.h>
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/*
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* This file is compiled and linked to be the last .o of the __const section
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* of the __DATA segment (see MakeInc.kernel, lastkernelconstructor is placed
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* in the __LAST segment.)
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*
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* This blank page allows us to safely map the const section RO while the rest
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* of __DATA is RW. This is needed since ld has no way of specifying section size
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* alignment and no straight forward way to specify section ordering.
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*/
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#if defined(__arm64__)
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/* PAGE_SIZE on ARM64 is an expression derived from a non-const global variable */
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#define PAD_SIZE PAGE_MAX_SIZE
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#else
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#define PAD_SIZE PAGE_SIZE
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#endif
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static const uint8_t __attribute__((section("__DATA,__const"))) data_const_padding[PAD_SIZE] = {[0 ... PAD_SIZE - 1] = 0xFF};
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const vm_offset_t __attribute__((section("__DATA,__data"))) _lastkerneldataconst = (vm_offset_t)&data_const_padding[0];
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const vm_size_t __attribute__((section("__DATA,__data"))) _lastkerneldataconst_padsize = sizeof(data_const_padding);
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