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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989, 1988 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50
  51 #include <cpus.h>
  52 #include <platforms.h>
  53 #include <mach_kdb.h>
  54 #include <himem.h>
  55 #include <fast_idle.h>
  56
  57 #include <mach/i386/vm_param.h>
  58
  59 #include <string.h>
  60 #include <mach/vm_param.h>
  61 #include <mach/vm_prot.h>
  62 #include <mach/machine.h>
  63 #include <mach/time_value.h>
  64 #include <kern/etap_macros.h>
  65 #include <kern/spl.h>
  66 #include <kern/assert.h>
  67 #include <kern/debug.h>
  68 #include <kern/misc_protos.h>
  69 #include <kern/cpu_data.h>
  70 #include <kern/processor.h>
  71 #include <vm/vm_page.h>
  72 #include <vm/pmap.h>
  73 #include <vm/vm_kern.h>
  74 #include <i386/pmap.h>
  75 #include <i386/ipl.h>
  76 #include <i386/pio.h>
  77 #include <i386/misc_protos.h>
  78 #include <i386/mp_slave_boot.h>
  79 #ifdef __MACHO__
  80 #include <mach/boot_info.h>
  81 #include <mach/thread_status.h>
  82 #endif
  83
  84 vm_size_t       mem_size = 0;
  85 vm_offset_t     first_addr = 0; /* set by start.s - keep out of bss */
  86 vm_offset_t     first_avail = 0;/* first after page tables */
  87 vm_offset_t     last_addr;
  88
  89 uint64_t        max_mem;
  90 uint64_t        sane_size;
  91
  92 vm_offset_t     avail_start, avail_end;
  93 vm_offset_t     virtual_avail, virtual_end;
  94 vm_offset_t     hole_start, hole_end;
  95 vm_offset_t     avail_next;
  96 unsigned int    avail_remaining;
  97
  98 /* parameters passed from bootstrap loader */
  99 int             cnvmem = 0;             /* must be in .data section */
 100 int             extmem = 0;
 101
 102 #ifndef __MACHO__
 103 extern char     edata, end;
 104 #endif
 105
 106 #ifdef __MACHO__
 107 #include        <mach-o/loader.h>
 108 vm_offset_t     edata, etext, end;
 109
 110 extern struct mach_header _mh_execute_header;
 111 void *sectTEXTB; int sectSizeTEXT;
 112 void *sectDATAB; int sectSizeDATA;
 113 void *sectOBJCB; int sectSizeOBJC;
 114 void *sectLINKB; int sectSizeLINK;
 115 void *sectPRELINKB; int sectSizePRELINK;
 116
 117 #endif
 118
 119 /*
 120  * Basic VM initialization.
 121  */
 122 void
 123 i386_vm_init(unsigned int maxmem, KernelBootArgs_t *args)
 124 {
 125         int i,j;                        /* Standard index vars. */
 126         vm_size_t       bios_hole_size;
 127
 128 #ifdef  __MACHO__
 129         /* Now retrieve addresses for end, edata, and etext
 130          * from MACH-O headers.
 131          */
 132
 133         sectTEXTB = (void *) getsegdatafromheader(
 134                 &_mh_execute_header, "__TEXT", &sectSizeTEXT);
 135         sectDATAB = (void *) getsegdatafromheader(
 136                 &_mh_execute_header, "__DATA", &sectSizeDATA);
 137         sectOBJCB = (void *) getsegdatafromheader(
 138                 &_mh_execute_header, "__OBJC", &sectSizeOBJC);
 139         sectLINKB = (void *) getsegdatafromheader(
 140                 &_mh_execute_header, "__LINKEDIT", &sectSizeLINK);
 141         sectPRELINKB = (void *) getsegdatafromheader(
 142                 &_mh_execute_header, "__PRELINK", &sectSizePRELINK);
 143
 144         etext = (vm_offset_t) sectTEXTB + sectSizeTEXT;
 145         edata = (vm_offset_t) sectDATAB + sectSizeDATA;
 146 #endif
 147 #ifndef __MACHO__
 148         /*
 149          * Zero the BSS.
 150          */
 151
 152         bzero((char *)&edata,(unsigned)(&end - &edata));
 153 #endif
 154
 155         /* Now copy over various boot args bits.. */
 156         cnvmem = args->convmem;
 157         extmem = args->extmem;
 158
 159         /*
 160          * Initialize the pic prior to any possible call to an spl.
 161          */
 162
 163         set_cpu_model();
 164         vm_set_page_size();
 165
 166         /*
 167          * Initialize the Event Trace Analysis Package
 168          * Static Phase: 1 of 2
 169          */
 170         etap_init_phase1();
 171
 172         /*
 173          * Compute the memory size.
 174          */
 175
 176 #if NCPUS > 1
 177         /* First two pages are used to boot the other cpus. */
 178         /* TODO - reclaim pages after all cpus have booted */
 179
 180         first_addr = MP_FIRST_ADDR;
 181 #else
 182         first_addr = 0x1000;
 183 #endif
 184
 185         /* BIOS leaves data in low memory */
 186         last_addr = 1024*1024 + extmem*1024;
 187
 188         /* extended memory starts at 1MB */
 189
 190         bios_hole_size = 1024*1024 - trunc_page((vm_offset_t)(1024 * cnvmem));
 191
 192         /*
 193          *      Initialize for pmap_free_pages and pmap_next_page.
 194          *      These guys should be page-aligned.
 195          */
 196
 197         hole_start = trunc_page((vm_offset_t)(1024 * cnvmem));
 198         hole_end = round_page((vm_offset_t)first_avail);
 199
 200         /*
 201          * compute mem_size
 202          */
 203
 204         /*
 205          * We're currently limited to 512 MB max physical memory.
 206          */
 207 #define M       (1024*1024)
 208 #define MAXMEM  (512*M)
 209         if ((maxmem == 0) && (last_addr - bios_hole_size > MAXMEM)) {
 210                 printf("Physical memory %d MB, "\
 211                         "maximum usable memory limited to %d MB\n",
 212                         (last_addr - bios_hole_size)/M, MAXMEM/M);
 213                 maxmem = MAXMEM;
 214         }
 215
 216         if (maxmem != 0) {
 217             if (maxmem < (last_addr) - bios_hole_size)
 218                 last_addr = maxmem + bios_hole_size;
 219         }
 220
 221         first_addr = round_page(first_addr);
 222         last_addr = trunc_page(last_addr);
 223         mem_size = last_addr - bios_hole_size;
 224
 225         max_mem = (uint64_t)mem_size;
 226         sane_size = max_mem;
 227
 228         avail_start = first_addr;
 229         avail_end = last_addr;
 230         avail_next = avail_start;
 231
 232 #if     NCPUS > 1
 233         interrupt_stack_alloc();
 234 #endif  /* NCPUS > 1 */
 235
 236         /*
 237          *      Initialize kernel physical map.
 238          *      Kernel virtual address starts at VM_KERNEL_MIN_ADDRESS.
 239          */
 240         pmap_bootstrap(0);
 241
 242         avail_remaining = atop((avail_end - avail_start) -
 243                                (hole_end - hole_start));
 244 }
 245
 246 unsigned int
 247 pmap_free_pages(void)
 248 {
 249         return avail_remaining;
 250 }
 251
 252 boolean_t
 253 pmap_next_page(
 254                ppnum_t *pn)
 255 {
 256         if (avail_next == avail_end)
 257                 return FALSE;
 258
 259         /* skip the hole */
 260
 261         if (avail_next == hole_start)
 262                 avail_next = hole_end;
 263
 264         *pn = (ppnum_t)i386_btop(avail_next);
 265         avail_next += PAGE_SIZE;
 266         avail_remaining--;
 267
 268         return TRUE;
 269 }
 270
 271 boolean_t
 272 pmap_valid_page(
 273         vm_offset_t x)
 274 {
 275         return ((avail_start <= x) && (x < avail_end));
 276 }