osfmk/vm/vm_init.c

   1 /*
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  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58 /*
  59  *      File:   vm/vm_init.c
  60  *      Author: Avadis Tevanian, Jr., Michael Wayne Young
  61  *      Date:   1985
  62  *
  63  *      Initialize the Virtual Memory subsystem.
  64  */
  65
  66 #include <mach/machine/vm_types.h>
  67 #include <mach/vm_map.h>
  68 #include <kern/startup.h>
  69 #include <kern/zalloc_internal.h>
  70 #include <kern/kext_alloc.h>
  71 #include <sys/kdebug.h>
  72 #include <vm/vm_object.h>
  73 #include <vm/vm_map.h>
  74 #include <vm/vm_page.h>
  75 #include <vm/vm_kern.h>
  76 #include <vm/memory_object.h>
  77 #include <vm/vm_fault.h>
  78 #include <vm/vm_init.h>
  79
  80 #include <pexpert/pexpert.h>
  81
  82 #include <vm/vm_protos.h>
  83
  84 const vm_offset_t vm_min_kernel_address = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
  85 const vm_offset_t vm_max_kernel_address = VM_MAX_KERNEL_ADDRESS;
  86
  87 TUNABLE(bool, iokit_iomd_setownership_enabled,
  88     "iokit_iomd_setownership_enabled", true);
  89
  90 vm_offset_t kmapoff_kaddr;
  91 unsigned int kmapoff_pgcnt;
  92
  93 static inline void
  94 vm_mem_bootstrap_log(const char *message)
  95 {
  96 //      kprintf("vm_mem_bootstrap: %s\n", message);
  97         kernel_debug_string_early(message);
  98 }
  99
 100 /*
 101  *      vm_mem_bootstrap initializes the virtual memory system.
 102  *      This is done only by the first cpu up.
 103  */
 104 __startup_func
 105 void
 106 vm_mem_bootstrap(void)
 107 {
 108         vm_offset_t     start, end;
 109
 110         /*
 111          *      Initializes resident memory structures.
 112          *      From here on, all physical memory is accounted for,
 113          *      and we use only virtual addresses.
 114          */
 115         vm_mem_bootstrap_log("vm_page_bootstrap");
 116         vm_page_bootstrap(&start, &end);
 117
 118         /*
 119          *      Initialize other VM packages
 120          */
 121
 122         vm_mem_bootstrap_log("zone_bootstrap");
 123         zone_bootstrap();
 124
 125         vm_mem_bootstrap_log("vm_object_bootstrap");
 126         vm_object_bootstrap();
 127
 128         kernel_startup_initialize_upto(STARTUP_SUB_VM_KERNEL);
 129
 130         vm_mem_bootstrap_log("vm_map_init");
 131         vm_map_init();
 132
 133         vm_mem_bootstrap_log("kmem_init");
 134         kmem_init(start, end);
 135
 136         kernel_startup_initialize_upto(STARTUP_SUB_KMEM);
 137
 138         /*
 139          * Eat a random amount of kernel_map to fuzz subsequent heap, zone and
 140          * stack addresses. (With a 4K page and 9 bits of randomness, this
 141          * eats about 2M of VA from the map)
 142          *
 143          * Note that we always need to slide by at least one page because the VM
 144          * pointer packing schemes using KERNEL_PMAP_HEAP_RANGE_START as a base
 145          * do not admit this address to be part of any zone submap.
 146          */
 147         kmapoff_pgcnt = (early_random() & 0x1ff) + 1; /* 9 bits */
 148         if (vm_allocate_kernel(kernel_map, &kmapoff_kaddr,
 149             kmapoff_pgcnt * PAGE_SIZE_64, VM_FLAGS_ANYWHERE, VM_KERN_MEMORY_OSFMK) != KERN_SUCCESS) {
 150                 panic("cannot vm_allocate %u kernel_map pages", kmapoff_pgcnt);
 151         }
 152
 153         vm_mem_bootstrap_log("pmap_init");
 154         pmap_init();
 155
 156         kernel_startup_initialize_upto(STARTUP_SUB_KMEM_ALLOC);
 157
 158         vm_mem_bootstrap_log("vm_fault_init");
 159         vm_fault_init();
 160
 161         vm_mem_bootstrap_log("kext_alloc_init");
 162         kext_alloc_init();
 163
 164         kernel_startup_initialize_upto(STARTUP_SUB_ZALLOC);
 165
 166         vm_paging_map_init();
 167
 168         vm_page_delayed_work_init_ctx();
 169
 170         if (iokit_iomd_setownership_enabled) {
 171                 kprintf("IOKit IOMD setownership ENABLED\n");
 172         } else {
 173                 kprintf("IOKit IOMD setownership DISABLED\n");
 174         }
 175 }