osfmk/vm/vm_init.c

   1 /*
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  28 /*
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  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 void
 117 vm_mem_bootstrap(void)
 118 {
 119         vm_offset_t     start, end;
 120         vm_size_t zsizearg;
 121         mach_vm_size_t zsize;
 122
 123         /*
 124          *      Initializes resident memory structures.
 125          *      From here on, all physical memory is accounted for,
 126          *      and we use only virtual addresses.
 127          */
 128         vm_mem_bootstrap_log("vm_page_bootstrap");
 129         vm_page_bootstrap(&start, &end);
 130
 131         /*
 132          *      Initialize other VM packages
 133          */
 134
 135         vm_mem_bootstrap_log("zone_bootstrap");
 136         zone_bootstrap();
 137
 138         vm_mem_bootstrap_log("vm_object_bootstrap");
 139         vm_object_bootstrap();
 140
 141         vm_kernel_ready = TRUE;
 142
 143         vm_mem_bootstrap_log("vm_map_init");
 144         vm_map_init();
 145
 146         vm_mem_bootstrap_log("kmem_init");
 147         kmem_init(start, end);
 148         kmem_ready = TRUE;
 149         /*
 150          * Eat a random amount of kernel_map to fuzz subsequent heap, zone and
 151          * stack addresses. (With a 4K page and 9 bits of randomness, this
 152          * eats at most 2M of VA from the map.)
 153          */
 154         if (!PE_parse_boot_argn("kmapoff", &kmapoff_pgcnt,
 155             sizeof (kmapoff_pgcnt)))
 156                 kmapoff_pgcnt = early_random() & 0x1ff; /* 9 bits */
 157
 158         if (kmapoff_pgcnt > 0 &&
 159             vm_allocate_kernel(kernel_map, &kmapoff_kaddr,
 160             kmapoff_pgcnt * PAGE_SIZE_64, VM_FLAGS_ANYWHERE, VM_KERN_MEMORY_OSFMK) != KERN_SUCCESS)
 161                 panic("cannot vm_allocate %u kernel_map pages", kmapoff_pgcnt);
 162
 163 #if CONFIG_EMBEDDED
 164         PE_parse_boot_argn("log_executable_mem_entry",
 165                            &log_executable_mem_entry,
 166                            sizeof (log_executable_mem_entry));
 167 #endif /* CONFIG_EMBEDDED */
 168
 169         vm_mem_bootstrap_log("pmap_init");
 170         pmap_init();
 171
 172         kmem_alloc_ready = TRUE;
 173
 174         if (PE_parse_boot_argn("zsize", &zsizearg, sizeof (zsizearg)))
 175                 zsize = zsizearg * 1024ULL * 1024ULL;
 176         else {
 177                 zsize = sane_size >> 2;                         /* Get target zone size as 1/4 of physical memory */
 178         }
 179
 180         if (zsize < ZONE_MAP_MIN)
 181                 zsize = ZONE_MAP_MIN;   /* Clamp to min */
 182 #if defined(__LP64__)
 183         zsize += zsize >> 1;
 184 #endif  /* __LP64__ */
 185         if (zsize > sane_size >> 1)
 186                 zsize = sane_size >> 1; /* Clamp to half of RAM max */
 187 #if !__LP64__
 188         if (zsize > ZONE_MAP_MAX)
 189                 zsize = ZONE_MAP_MAX;   /* Clamp to 1.5GB max for K32 */
 190 #endif /* !__LP64__ */
 191
 192 #if CONFIG_EMBEDDED
 193 #if defined(__LP64__)
 194         {
 195         mach_vm_size_t max_zsize;
 196
 197         /*
 198          * because of the limited kernel virtual space for embedded systems,
 199          * we need to clamp the size of the zone map being created... replicate
 200          * the above calculation for a 1Gbyte, LP64 system and use that as the
 201          * maximum size for the zone map
 202          */
 203         max_zsize = (1024ULL * 1024ULL * 1024ULL) >> 2ULL;
 204         max_zsize += max_zsize >> 1;
 205
 206         if (zsize > max_zsize)
 207                 zsize = max_zsize;
 208         }
 209 #endif
 210 #endif
 211         vm_mem_bootstrap_log("kext_alloc_init");
 212         kext_alloc_init();
 213
 214         vm_mem_bootstrap_log("zone_init");
 215         assert((vm_size_t) zsize == zsize);
 216         zone_init((vm_size_t) zsize);   /* Allocate address space for zones */
 217
 218         /* The vm_page_zone must be created prior to kalloc_init; that
 219          * routine can trigger zalloc()s (for e.g. mutex statistic structure
 220          * initialization). The vm_page_zone must exist to saisfy fictitious
 221          * page allocations (which are used for guard pages by the guard
 222          * mode zone allocator).
 223          */
 224         vm_mem_bootstrap_log("vm_page_module_init");
 225         vm_page_module_init();
 226
 227         vm_mem_bootstrap_log("kalloc_init");
 228         kalloc_init();
 229
 230         vm_mem_bootstrap_log("vm_fault_init");
 231         vm_fault_init();
 232
 233         vm_mem_bootstrap_log("memory_manager_default_init");
 234         memory_manager_default_init();
 235
 236         vm_mem_bootstrap_log("memory_object_control_bootstrap");
 237         memory_object_control_bootstrap();
 238
 239         vm_mem_bootstrap_log("device_pager_bootstrap");
 240         device_pager_bootstrap();
 241
 242         vm_paging_map_init();
 243
 244         vm_mem_bootstrap_log("vm_mem_bootstrap done");
 245 }
 246
 247 void
 248 vm_mem_init(void)
 249 {
 250         vm_object_init();
 251 }