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/zalloc.h>
  69 #include <kern/kalloc.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 #define ZONE_MAP_MIN CONFIG_ZONE_MAP_MIN
  85
  86 /* Maximum zone size is 1.5G */
  87 #define ZONE_MAP_MAX (1024 * 1024 * 1536)
  88
  89 const vm_offset_t vm_min_kernel_address = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
  90 const vm_offset_t vm_max_kernel_address = VM_MAX_KERNEL_ADDRESS;
  91
  92 boolean_t vm_kernel_ready = FALSE;
  93 boolean_t kmem_ready = FALSE;
  94 boolean_t kmem_alloc_ready = FALSE;
  95 boolean_t zlog_ready = FALSE;
  96
  97 vm_offset_t kmapoff_kaddr;
  98 unsigned int kmapoff_pgcnt;
  99
 100 #if CONFIG_EMBEDDED
 101 extern int log_executable_mem_entry;
 102 #endif /* CONFIG_EMBEDDED */
 103
 104 static inline void
 105 vm_mem_bootstrap_log(const char *message)
 106 {
 107 //      kprintf("vm_mem_bootstrap: %s\n", message);
 108         kernel_debug_string_early(message);
 109 }
 110
 111 /*
 112  *      vm_mem_bootstrap initializes the virtual memory system.
 113  *      This is done only by the first cpu up.
 114  */
 115
 116 int pacified_footprint_suspend = 0;
 117 int pacified_purgeable_iokit = 0;
 118
 119 void
 120 vm_mem_bootstrap(void)
 121 {
 122         vm_offset_t     start, end;
 123         vm_size_t zsizearg;
 124         mach_vm_size_t zsize;
 125         int pacified;
 126
 127         pacified = 0;
 128         PE_parse_boot_argn("pacified",
 129                            &pacified,
 130                            sizeof (pacified));
 131         if (pacified) {
 132                 pacified_footprint_suspend = 1;
 133                 pacified_purgeable_iokit = 1;
 134         }
 135         PE_parse_boot_argn("pacified_footprint_suspend",
 136                            &pacified_footprint_suspend,
 137                            sizeof (pacified_footprint_suspend));
 138         PE_parse_boot_argn("pacified_purgeable_iokit",
 139                            &pacified_purgeable_iokit,
 140                            sizeof (pacified_purgeable_iokit));
 141
 142         /*
 143          *      Initializes resident memory structures.
 144          *      From here on, all physical memory is accounted for,
 145          *      and we use only virtual addresses.
 146          */
 147         vm_mem_bootstrap_log("vm_page_bootstrap");
 148         vm_page_bootstrap(&start, &end);
 149
 150         /*
 151          *      Initialize other VM packages
 152          */
 153
 154         vm_mem_bootstrap_log("zone_bootstrap");
 155         zone_bootstrap();
 156
 157         vm_mem_bootstrap_log("vm_object_bootstrap");
 158         vm_object_bootstrap();
 159
 160         vm_kernel_ready = TRUE;
 161
 162         vm_mem_bootstrap_log("vm_map_init");
 163         vm_map_init();
 164
 165         vm_mem_bootstrap_log("kmem_init");
 166         kmem_init(start, end);
 167         kmem_ready = TRUE;
 168         /*
 169          * Eat a random amount of kernel_map to fuzz subsequent heap, zone and
 170          * stack addresses. (With a 4K page and 9 bits of randomness, this
 171          * eats at most 2M of VA from the map.)
 172          */
 173         if (!PE_parse_boot_argn("kmapoff", &kmapoff_pgcnt,
 174             sizeof (kmapoff_pgcnt)))
 175                 kmapoff_pgcnt = early_random() & 0x1ff; /* 9 bits */
 176
 177         if (kmapoff_pgcnt > 0 &&
 178             vm_allocate_kernel(kernel_map, &kmapoff_kaddr,
 179             kmapoff_pgcnt * PAGE_SIZE_64, VM_FLAGS_ANYWHERE, VM_KERN_MEMORY_OSFMK) != KERN_SUCCESS)
 180                 panic("cannot vm_allocate %u kernel_map pages", kmapoff_pgcnt);
 181
 182 #if CONFIG_EMBEDDED
 183         PE_parse_boot_argn("log_executable_mem_entry",
 184                            &log_executable_mem_entry,
 185                            sizeof (log_executable_mem_entry));
 186 #endif /* CONFIG_EMBEDDED */
 187
 188         vm_mem_bootstrap_log("pmap_init");
 189         pmap_init();
 190
 191         kmem_alloc_ready = TRUE;
 192
 193         if (PE_parse_boot_argn("zsize", &zsizearg, sizeof (zsizearg)))
 194                 zsize = zsizearg * 1024ULL * 1024ULL;
 195         else {
 196                 zsize = sane_size >> 2;                         /* Get target zone size as 1/4 of physical memory */
 197         }
 198
 199         if (zsize < ZONE_MAP_MIN)
 200                 zsize = ZONE_MAP_MIN;   /* Clamp to min */
 201 #if defined(__LP64__)
 202         zsize += zsize >> 1;
 203 #endif  /* __LP64__ */
 204         if (zsize > sane_size >> 1)
 205                 zsize = sane_size >> 1; /* Clamp to half of RAM max */
 206 #if !__LP64__
 207         if (zsize > ZONE_MAP_MAX)
 208                 zsize = ZONE_MAP_MAX;   /* Clamp to 1.5GB max for K32 */
 209 #endif /* !__LP64__ */
 210
 211 #if CONFIG_EMBEDDED
 212 #if defined(__LP64__)
 213         {
 214         mach_vm_size_t max_zsize;
 215
 216         /*
 217          * because of the limited kernel virtual space for embedded systems,
 218          * we need to clamp the size of the zone map being created... replicate
 219          * the above calculation for a 1Gbyte, LP64 system and use that as the
 220          * maximum size for the zone map
 221          */
 222         max_zsize = (1024ULL * 1024ULL * 1024ULL) >> 2ULL;
 223         max_zsize += max_zsize >> 1;
 224
 225         if (zsize > max_zsize)
 226                 zsize = max_zsize;
 227         }
 228 #endif
 229 #endif
 230         vm_mem_bootstrap_log("kext_alloc_init");
 231         kext_alloc_init();
 232
 233         vm_mem_bootstrap_log("zone_init");
 234         assert((vm_size_t) zsize == zsize);
 235         zone_init((vm_size_t) zsize);   /* Allocate address space for zones */
 236
 237         /* The vm_page_zone must be created prior to kalloc_init; that
 238          * routine can trigger zalloc()s (for e.g. mutex statistic structure
 239          * initialization). The vm_page_zone must exist to saisfy fictitious
 240          * page allocations (which are used for guard pages by the guard
 241          * mode zone allocator).
 242          */
 243         vm_mem_bootstrap_log("vm_page_module_init");
 244         vm_page_module_init();
 245
 246         vm_mem_bootstrap_log("kalloc_init");
 247         kalloc_init();
 248
 249         vm_mem_bootstrap_log("vm_fault_init");
 250         vm_fault_init();
 251
 252         vm_mem_bootstrap_log("memory_manager_default_init");
 253         memory_manager_default_init();
 254
 255         vm_mem_bootstrap_log("memory_object_control_bootstrap");
 256         memory_object_control_bootstrap();
 257
 258         vm_mem_bootstrap_log("device_pager_bootstrap");
 259         device_pager_bootstrap();
 260
 261         vm_paging_map_init();
 262
 263         vm_mem_bootstrap_log("vm_mem_bootstrap done");
 264 }
 265
 266 void
 267 vm_mem_init(void)
 268 {
 269         vm_object_init();
 270 }