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