osfmk/i386/i386_vm_init.c

   1 /*
   2  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989, 1988 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53
  54 #include <cpus.h>
  55 #include <platforms.h>
  56 #include <mach_kdb.h>
  57 #include <himem.h>
  58 #include <fast_idle.h>
  59
  60 #include <mach/i386/vm_param.h>
  61
  62 #include <string.h>
  63 #include <mach/vm_param.h>
  64 #include <mach/vm_prot.h>
  65 #include <mach/machine.h>
  66 #include <mach/time_value.h>
  67 #include <kern/etap_macros.h>
  68 #include <kern/spl.h>
  69 #include <kern/assert.h>
  70 #include <kern/debug.h>
  71 #include <kern/misc_protos.h>
  72 #include <kern/cpu_data.h>
  73 #include <kern/processor.h>
  74 #include <vm/vm_page.h>
  75 #include <vm/pmap.h>
  76 #include <vm/vm_kern.h>
  77 #include <i386/pmap.h>
  78 #include <i386/ipl.h>
  79 #include <i386/pio.h>
  80 #include <i386/misc_protos.h>
  81 #include <i386/mp_slave_boot.h>
  82 #ifdef __MACHO__
  83 #include <mach/boot_info.h>
  84 #include <mach/thread_status.h>
  85 #endif
  86
  87 vm_size_t       mem_size = 0;
  88 vm_offset_t     first_addr = 0; /* set by start.s - keep out of bss */
  89 vm_offset_t     first_avail = 0;/* first after page tables */
  90 vm_offset_t     last_addr;
  91
  92 uint64_t        max_mem;
  93 uint64_t        sane_size;
  94
  95 vm_offset_t     avail_start, avail_end;
  96 vm_offset_t     virtual_avail, virtual_end;
  97 vm_offset_t     hole_start, hole_end;
  98 vm_offset_t     avail_next;
  99 unsigned int    avail_remaining;
 100
 101 /* parameters passed from bootstrap loader */
 102 int             cnvmem = 0;             /* must be in .data section */
 103 int             extmem = 0;
 104
 105 #ifndef __MACHO__
 106 extern char     edata, end;
 107 #endif
 108
 109 #ifdef __MACHO__
 110 #include        <mach-o/loader.h>
 111 vm_offset_t     edata, etext, end;
 112
 113 extern struct mach_header _mh_execute_header;
 114 void *sectTEXTB; int sectSizeTEXT;
 115 void *sectDATAB; int sectSizeDATA;
 116 void *sectOBJCB; int sectSizeOBJC;
 117 void *sectLINKB; int sectSizeLINK;
 118 void *sectPRELINKB; int sectSizePRELINK;
 119
 120 #endif
 121
 122 /*
 123  * Basic VM initialization.
 124  */
 125 void
 126 i386_vm_init(unsigned int maxmem, KernelBootArgs_t *args)
 127 {
 128         int i,j;                        /* Standard index vars. */
 129         vm_size_t       bios_hole_size;
 130
 131 #ifdef  __MACHO__
 132         /* Now retrieve addresses for end, edata, and etext
 133          * from MACH-O headers.
 134          */
 135
 136         sectTEXTB = (void *) getsegdatafromheader(
 137                 &_mh_execute_header, "__TEXT", &sectSizeTEXT);
 138         sectDATAB = (void *) getsegdatafromheader(
 139                 &_mh_execute_header, "__DATA", &sectSizeDATA);
 140         sectOBJCB = (void *) getsegdatafromheader(
 141                 &_mh_execute_header, "__OBJC", &sectSizeOBJC);
 142         sectLINKB = (void *) getsegdatafromheader(
 143                 &_mh_execute_header, "__LINKEDIT", &sectSizeLINK);
 144         sectPRELINKB = (void *) getsegdatafromheader(
 145                 &_mh_execute_header, "__PRELINK", &sectSizePRELINK);
 146
 147         etext = (vm_offset_t) sectTEXTB + sectSizeTEXT;
 148         edata = (vm_offset_t) sectDATAB + sectSizeDATA;
 149 #endif
 150 #ifndef __MACHO__
 151         /*
 152          * Zero the BSS.
 153          */
 154
 155         bzero((char *)&edata,(unsigned)(&end - &edata));
 156 #endif
 157
 158         /* Now copy over various boot args bits.. */
 159         cnvmem = args->convmem;
 160         extmem = args->extmem;
 161
 162         /*
 163          * Initialize the pic prior to any possible call to an spl.
 164          */
 165
 166         set_cpu_model();
 167         vm_set_page_size();
 168
 169         /*
 170          * Initialize the Event Trace Analysis Package
 171          * Static Phase: 1 of 2
 172          */
 173         etap_init_phase1();
 174
 175         /*
 176          * Compute the memory size.
 177          */
 178
 179 #if NCPUS > 1
 180         /* First two pages are used to boot the other cpus. */
 181         /* TODO - reclaim pages after all cpus have booted */
 182
 183         first_addr = MP_FIRST_ADDR;
 184 #else
 185         first_addr = 0x1000;
 186 #endif
 187
 188         /* BIOS leaves data in low memory */
 189         last_addr = 1024*1024 + extmem*1024;
 190
 191         /* extended memory starts at 1MB */
 192
 193         bios_hole_size = 1024*1024 - trunc_page((vm_offset_t)(1024 * cnvmem));
 194
 195         /*
 196          *      Initialize for pmap_free_pages and pmap_next_page.
 197          *      These guys should be page-aligned.
 198          */
 199
 200         hole_start = trunc_page((vm_offset_t)(1024 * cnvmem));
 201         hole_end = round_page((vm_offset_t)first_avail);
 202
 203         /*
 204          * compute mem_size
 205          */
 206
 207         /*
 208          * We're currently limited to 512 MB max physical memory.
 209          */
 210 #define M       (1024*1024)
 211 #define MAXMEM  (512*M)
 212         if ((maxmem == 0) && (last_addr - bios_hole_size > MAXMEM)) {
 213                 printf("Physical memory %d MB, "\
 214                         "maximum usable memory limited to %d MB\n",
 215                         (last_addr - bios_hole_size)/M, MAXMEM/M);
 216                 maxmem = MAXMEM;
 217         }
 218
 219         if (maxmem != 0) {
 220             if (maxmem < (last_addr) - bios_hole_size)
 221                 last_addr = maxmem + bios_hole_size;
 222         }
 223
 224         first_addr = round_page(first_addr);
 225         last_addr = trunc_page(last_addr);
 226         mem_size = last_addr - bios_hole_size;
 227
 228         max_mem = (uint64_t)mem_size;
 229         sane_size = max_mem;
 230
 231         avail_start = first_addr;
 232         avail_end = last_addr;
 233         avail_next = avail_start;
 234
 235 #if     NCPUS > 1
 236         interrupt_stack_alloc();
 237 #endif  /* NCPUS > 1 */
 238
 239         /*
 240          *      Initialize kernel physical map.
 241          *      Kernel virtual address starts at VM_KERNEL_MIN_ADDRESS.
 242          */
 243         pmap_bootstrap(0);
 244
 245         avail_remaining = atop((avail_end - avail_start) -
 246                                (hole_end - hole_start));
 247 }
 248
 249 unsigned int
 250 pmap_free_pages(void)
 251 {
 252         return avail_remaining;
 253 }
 254
 255 boolean_t
 256 pmap_next_page(
 257                ppnum_t *pn)
 258 {
 259         if (avail_next == avail_end)
 260                 return FALSE;
 261
 262         /* skip the hole */
 263
 264         if (avail_next == hole_start)
 265                 avail_next = hole_end;
 266
 267         *pn = (ppnum_t)i386_btop(avail_next);
 268         avail_next += PAGE_SIZE;
 269         avail_remaining--;
 270
 271         return TRUE;
 272 }
 273
 274 boolean_t
 275 pmap_valid_page(
 276         vm_offset_t x)
 277 {
 278         return ((avail_start <= x) && (x < avail_end));
 279 }