96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
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* Copyright (C) 2006-2011 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Computer, Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Computer, Inc.
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*/
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#include <debug.h>
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#include <arch.h>
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#include <compiler.h>
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#include <lib/env.h>
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#include <lib/heap.h>
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#include <lib/mib.h>
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#include <lib/random.h>
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#include <platform/memmap.h>
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#include <sys.h>
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#include <sys/task.h>
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#include <sys/security.h>
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#include <sys/callout.h>
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/* these need to be non-static and initialised for applications that patch them */
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#define HEAP_SIZE_UNPATCHED ((size_t)-1)
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void *heap_base = (void *)-1;
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size_t heap_size = HEAP_SIZE_UNPATCHED;
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MIB_CONSTANT_PTR(kMIBBuildBanner, kOIDTypeString|kOIDDataIndirect, (void *)&build_banner_string);
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MIB_CONSTANT_PTR(kMIBBuildStyle, kOIDTypeString|kOIDDataIndirect, (void *)&build_style_string);
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MIB_CONSTANT_PTR(kMIBBuildTag, kOIDTypeString|kOIDDataIndirect, (void *)&build_tag_string);
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/* called from each binary's main() routine to initialize basic system services */
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void sys_init(void)
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{
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/*
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* Initialise the heap.
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*
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* If HEAP_END is defined, we assume that we are going to
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* configure the heap size using it.
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*
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* If HEAP_BASE is defined, we respect the definition. Otherwise
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* we start the heap at the end of the __DATA segment.
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*
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* If HEAP_END is not defined, someone may have patched heap_base/
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* heap_end, so we check and create a heap with their values if they
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* have.
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*/
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#ifdef HEAP_END
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# ifdef HEAP_BASE
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/* we have a defined base for the heap */
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heap_base = (void *)HEAP_BASE;
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# else
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/* create the heap at the end of the __DATA segment */
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heap_base = __segment_end(__DATA);
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# endif
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/* compute the heap size*/
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heap_size = HEAP_END - (uintptr_t)heap_base;
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#endif
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/* if we have computed (or had patched in) a heap size, create the heap */
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if (heap_size != HEAP_SIZE_UNPATCHED) {
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#if WITH_RANDOM
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bool random_heap_cookie = mib_get_bool(kMIBTargetRandomHeapCookie);
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if (random_heap_cookie) {
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uint8_t heap_cookie[HEAP_COOKIE_SIZE];
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random_get_bytes_noheap(heap_cookie, sizeof(heap_cookie), heap_base, heap_size);
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heap_set_cookie(heap_cookie);
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}
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#endif
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heap_add_chunk(heap_base, heap_size, true);
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}
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/* initialize security */
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#if !WITH_NO_SECURITY
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security_init(false);
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#endif
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#if WITH_ENV
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/* populate the environment with some default values */
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sys_setup_default_environment();
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#endif
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/* initialize the tasking system */
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task_init();
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/* after tasks are initialized, do some more cpu init (if needed) */
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arch_cpu_init_posttasks();
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/* initialize the debug i/o queue */
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debug_init();
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}
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