arch/x86/kernel/platform/i86pc/include/sys/machparam.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2015 by Delphix. All rights reserved.
  24  * Copyright 2018 Joyent, Inc.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30
  31 #ifndef _SYS_MACHPARAM_H
  32 #define _SYS_MACHPARAM_H
  33
  34 #if !defined(_ASM)
  35 #include <sys/types.h>
  36
  37 #if defined(__xpv)
  38 #include <sys/xpv_impl.h>
  39 #endif
  40
  41 #endif
  42
  43 #ifdef  __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #ifndef _ASM
  48 #define ADDRESS_C(c)    c ## ul
  49 #else   /* _ASM */
  50 #define ADDRESS_C(c)    (c)
  51 #endif  /* _ASM */
  52
  53 /*
  54  * Machine dependent parameters and limits.
  55  */
  56
  57 #if defined(__amd64)
  58 /*
  59  * If NCPU grows beyond 256, sizing for the x86 comm page will require
  60  * adjustment.
  61  */
  62 #define NCPU    256
  63 #define NCPU_LOG2       8
  64 #elif defined(__i386)
  65 #define NCPU    32
  66 #define NCPU_LOG2       5
  67 #endif
  68
  69 /* NCPU_P2 is NCPU rounded to a power of 2 */
  70 #define NCPU_P2 (1 << NCPU_LOG2)
  71
  72 /*
  73  * The value defined below could grow to 16. hat structure and
  74  * page_t have room for 16 nodes.
  75  */
  76 #define MAXNODES        4
  77
  78 /*
  79  * Define the FPU symbol if we could run on a machine with an external
  80  * FPU (i.e. not integrated with the normal machine state like the vax).
  81  *
  82  * The fpu is defined in the architecture manual, and the kernel hides
  83  * its absence if it is not present, that's pretty integrated, no?
  84  */
  85
  86 /* supported page sizes */
  87 #define MMU_PAGE_SIZES  3
  88
  89 /*
  90  * MMU_PAGES* describes the physical page size used by the mapping hardware.
  91  * PAGES* describes the logical page size used by the system.
  92  */
  93
  94 #define MMU_PAGESIZE    0x1000          /* 4096 bytes */
  95 #define MMU_PAGESHIFT   12              /* log2(MMU_PAGESIZE) */
  96
  97 #if !defined(_ASM)
  98 #define MMU_PAGEOFFSET  (MMU_PAGESIZE-1) /* Mask of address bits in page */
  99 #else   /* _ASM */
 100 #define MMU_PAGEOFFSET  _CONST(MMU_PAGESIZE-1)  /* assembler lameness */
 101 #endif  /* _ASM */
 102
 103 #define MMU_PAGEMASK    (~MMU_PAGEOFFSET)
 104
 105 #define PAGESIZE        0x1000          /* All of the above, for logical */
 106 #define PAGESHIFT       12
 107 #define PAGEOFFSET      (PAGESIZE - 1)
 108 #define PAGEMASK        (~PAGEOFFSET)
 109
 110 /*
 111  * DATA_ALIGN is used to define the alignment of the Unix data segment.
 112  */
 113 #define DATA_ALIGN      PAGESIZE
 114
 115 /*
 116  * DEFAULT KERNEL THREAD stack size (in pages).
 117  */
 118 #if defined(__amd64)
 119 #define DEFAULTSTKSZ_NPGS       5
 120 #elif defined(__i386)
 121 #define DEFAULTSTKSZ_NPGS       3
 122 #endif
 123
 124 #if !defined(_ASM)
 125 #define DEFAULTSTKSZ    (DEFAULTSTKSZ_NPGS * PAGESIZE)
 126 #else   /* !_ASM */
 127 #define DEFAULTSTKSZ    _MUL(DEFAULTSTKSZ_NPGS, PAGESIZE) /* as(1) lameness */
 128 #endif  /* !_ASM */
 129
 130 /*
 131  * KERNELBASE is the virtual address at which the kernel segments start in
 132  * all contexts.
 133  *
 134  * KERNELBASE is not fixed.  The value of KERNELBASE can change with
 135  * installed memory or on 32 bit systems the eprom variable 'eprom_kernelbase'.
 136  *
 137  * common/conf/param.c requires a compile time defined value for KERNELBASE.
 138  * This value is save in the variable _kernelbase.  _kernelbase may then be
 139  * modified with to a different value in i86pc/os/startup.c.
 140  *
 141  * Most code should be using kernelbase, which resolves to a reference to
 142  * _kernelbase.
 143  */
 144 #define KERNEL_TEXT_amd64       UINT64_C(0xfffffffffb800000)
 145
 146 #ifdef __i386
 147
 148 #define KERNEL_TEXT_i386        ADDRESS_C(0xfe800000)
 149
 150 /*
 151  * We don't use HYPERVISOR_VIRT_START, as we need both the PAE and non-PAE
 152  * versions in our code. We always compile based on the lower PAE address.
 153  */
 154 #define KERNEL_TEXT_i386_xpv    \
 155         (HYPERVISOR_VIRT_START_PAE - 3 * ADDRESS_C(0x400000))
 156
 157 #endif /* __i386 */
 158
 159 #if defined(__amd64)
 160
 161 #define KERNELBASE      ADDRESS_C(0xfffffd8000000000)
 162
 163 /*
 164  * Size of the unmapped "red zone" at the very bottom of the kernel's
 165  * address space.  Corresponds to 1 slot in the toplevel pagetable.
 166  */
 167 #define KERNEL_REDZONE_SIZE   ((uintptr_t)1 << 39)
 168
 169 /*
 170  * Base of 'core' heap area, which is used for kernel and module text/data
 171  * that must be within a 2GB range to allow for rip-relative addressing.
 172  */
 173 #define COREHEAP_BASE   ADDRESS_C(0xffffffffc0000000)
 174
 175 /*
 176  * Beginning of the segkpm window. A lower value than this is used if
 177  * physical addresses exceed 1TB. See i86pc/os/startup.c
 178  */
 179 #define SEGKPM_BASE     ADDRESS_C(0xfffffe0000000000)
 180
 181 /*
 182  * This is valloc_base, above seg_kpm, but below everything else.
 183  * A lower value than this may be used if SEGKPM_BASE is adjusted.
 184  * See i86pc/os/startup.c
 185  */
 186 #define VALLOC_BASE     ADDRESS_C(0xffffff0000000000)
 187
 188 /*
 189  * default and boundary sizes for segkp
 190  */
 191 #define SEGKPDEFSIZE    (2L * 1024L * 1024L * 1024L)            /*   2G */
 192 #define SEGKPMAXSIZE    (8L * 1024L * 1024L * 1024L)            /*   8G */
 193 #define SEGKPMINSIZE    (200L * 1024 * 1024L)                   /* 200M */
 194
 195 /*
 196  * minimum size for segzio
 197  */
 198 #define SEGZIOMINSIZE   (400L * 1024 * 1024L)                   /* 400M */
 199
 200 /*
 201  * During intial boot we limit heap to the top 4Gig.
 202  */
 203 #define BOOT_KERNELHEAP_BASE    ADDRESS_C(0xffffffff00000000)
 204
 205 /*
 206  * VMWare works best if we don't use the top 64Meg of memory for amd64.
 207  * Set KERNEL_TEXT to top_o_memory - 64Meg - 8 Meg for 8Meg of nucleus pages.
 208  */
 209 #define PROMSTART       ADDRESS_C(0xffc00000)
 210 #define KERNEL_TEXT     KERNEL_TEXT_amd64
 211
 212 /*
 213  * Virtual address range available to the debugger
 214  */
 215 #define SEGDEBUGBASE    ADDRESS_C(0xffffffffff800000)
 216 #define SEGDEBUGSIZE    ADDRESS_C(0x400000)
 217
 218 /*
 219  * Define upper limit on user address space
 220  *
 221  * In amd64, the upper limit on a 64-bit user address space is 1 large page
 222  * (2MB) below kernelbase.  The upper limit for a 32-bit user address space
 223  * is 1 small page (4KB) below the top of the 32-bit range.  The 64-bit
 224  * limit give dtrace the red zone it needs below kernelbase.  The 32-bit
 225  * limit gives us a small red zone to detect address-space overruns in a
 226  * user program.
 227  *
 228  * On the hypervisor, we limit the user to memory below the VA hole.
 229  * Subtract 1 large page for a red zone.
 230  */
 231 #if defined(__xpv)
 232 #define USERLIMIT       ADDRESS_C(0x00007fffffe00000)
 233 #else
 234 #define USERLIMIT       ADDRESS_C(0xfffffd7fffe00000)
 235 #endif
 236
 237 #ifdef bug_5074717_is_fixed
 238 #define USERLIMIT32     ADDRESS_C(0xfffff000)
 239 #else
 240 #define USERLIMIT32     ADDRESS_C(0xfefff000)
 241 #endif
 242
 243 #elif defined(__i386)
 244
 245 #ifdef DEBUG
 246 #define KERNELBASE      ADDRESS_C(0xc8000000)
 247 #else
 248 #define KERNELBASE      ADDRESS_C(0xd4000000)
 249 #endif
 250
 251 #define KERNELBASE_MAX  ADDRESS_C(0xe0000000)
 252
 253 /*
 254  * The i386 ABI requires that the user address space be at least 3Gb
 255  * in size.  KERNELBASE_ABI_MIN is used as the default KERNELBASE for
 256  * physical memory configurations > 4gb.
 257  */
 258 #define KERNELBASE_ABI_MIN      ADDRESS_C(0xc0000000)
 259
 260 /*
 261  * Size of the unmapped "red zone" at the very bottom of the kernel's
 262  * address space.  Since segmap start immediately above the red zone, this
 263  * needs to be MAXBSIZE aligned.
 264  */
 265 #define KERNEL_REDZONE_SIZE   MAXBSIZE
 266
 267 /*
 268  * This is the last 4MB of the 4G address space. Some psm modules
 269  * need this region of virtual address space mapped 1-1
 270  * The top 64MB of the address space is reserved for the hypervisor.
 271  */
 272 #define PROMSTART       ADDRESS_C(0xffc00000)
 273 #ifdef __xpv
 274 #define KERNEL_TEXT     KERNEL_TEXT_i386_xpv
 275 #else
 276 #define KERNEL_TEXT     KERNEL_TEXT_i386
 277 #endif
 278
 279 /*
 280  * Virtual address range available to the debugger
 281  * We place it just above the kernel text (4M) and kernel data (4M).
 282  */
 283 #define SEGDEBUGBASE    (KERNEL_TEXT + ADDRESS_C(0x800000))
 284 #define SEGDEBUGSIZE    ADDRESS_C(0x400000)
 285
 286 /*
 287  * Define upper limit on user address space
 288  */
 289 #define USERLIMIT       KERNELBASE
 290 #define USERLIMIT32     USERLIMIT
 291
 292 #endif  /* __i386 */
 293
 294 /*
 295  * Reserve pages just below KERNEL_TEXT for the GDT, IDT, LDT, TSS and debug
 296  * info.
 297  *
 298  * For now, DEBUG_INFO_VA must be first in this list for "xm" initiated dumps
 299  * of solaris domUs to be usable with mdb. Relying on a fixed VA is not viable
 300  * long term, but it's the best we've got for now.
 301  */
 302 #if !defined(_ASM)
 303 #define DEBUG_INFO_VA   (KERNEL_TEXT - MMU_PAGESIZE)
 304 #define GDT_VA          (DEBUG_INFO_VA - MMU_PAGESIZE)
 305 #define IDT_VA          (GDT_VA - MMU_PAGESIZE)
 306 #define LDT_VA          (IDT_VA - (16 * MMU_PAGESIZE))
 307 #define KTSS_VA         (LDT_VA - MMU_PAGESIZE)
 308 #define DFTSS_VA        (KTSS_VA - MMU_PAGESIZE)
 309 #define MISC_VA_BASE    (DFTSS_VA)
 310 #define MISC_VA_SIZE    (KERNEL_TEXT - MISC_VA_BASE)
 311 #endif /* !_ASM */
 312
 313 #if !defined(_ASM) && !defined(_KMDB)
 314 extern uintptr_t kernelbase, segmap_start, segmapsize;
 315 #endif
 316
 317 /*
 318  * ARGSBASE is the base virtual address of the range which
 319  * the kernel uses to map the arguments for exec.
 320  */
 321 #define ARGSBASE        PROMSTART
 322
 323 /*
 324  * reserve space for modules
 325  */
 326 #define MODTEXT (1024 * 1024 * 2)
 327 #define MODDATA (1024 * 300)
 328
 329 /*
 330  * The heap has a region allocated from it of HEAPTEXT_SIZE bytes specifically
 331  * for module text.
 332  */
 333 #define HEAPTEXT_SIZE           (64 * 1024 * 1024)      /* bytes */
 334
 335 /*
 336  * Size of a kernel threads stack.  It must be a whole number of pages
 337  * since the segment it comes from will only allocate space in pages.
 338  */
 339 #define T_STACKSZ       2*PAGESIZE
 340
 341 /*
 342  * Size of a cpu startup thread stack.  (It must be a whole number of pages
 343  * since the containing segment only allocates space in pages.)
 344  */
 345
 346 #define STARTUP_STKSZ   3*PAGESIZE
 347
 348 /*
 349  * Bus types
 350  */
 351 #define BTISA           1
 352 #define BTEISA          2
 353 #define BTMCA           3
 354
 355 #ifdef  __cplusplus
 356 }
 357 #endif
 358
 359 #endif  /* _SYS_MACHPARAM_H */