FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/vmparam.h

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      * Copyright (c) 1994 John S. Dyson
      * All rights reserved.
      * Copyright (c) 2003 Peter Wemm
      * All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * William Jolitz.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
     * $FreeBSD$
     */
    
    #ifdef __i386__
    #include <i386/vmparam.h>
    #else /* !__i386__ */
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_ 1
    
    /*
     * Machine dependent constants for AMD64.
     */
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #define MAXTSIZ         (32768UL*1024*1024)     /* max text size */
    #ifndef DFLDSIZ
    #define DFLDSIZ         (32768UL*1024*1024)     /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (32768UL*1024*1024)     /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
    #endif
    #ifndef MAXSSIZ
    #define MAXSSIZ         (512UL*1024*1024)       /* max stack size */
    #endif
    #ifndef SGROWSIZ
    #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
    #endif
    
    /*
     * We provide a machine specific single page allocator through the use
     * of the direct mapped segment.  This uses 2MB pages for reduced
     * TLB pressure.
     */
    #if !defined(KASAN) && !defined(KMSAN)
    #define UMA_MD_SMALL_ALLOC
    #endif
    
    /*
     * The physical address space is densely populated.
     */
    #define VM_PHYSSEG_DENSE
    
    /*
     * The number of PHYSSEG entries must be one greater than the number
     * of phys_avail entries because the phys_avail entry that spans the
     * largest physical address that is accessible by ISA DMA is split
     * into two PHYSSEG entries. 
     */
    #define VM_PHYSSEG_MAX          63
    
    /*
    * Create two free page pools: VM_FREEPOOL_DEFAULT is the default pool
    * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
    * the pool from which physical pages for page tables and small UMA
    * objects are allocated.
    */
   #define VM_NFREEPOOL            2
   #define VM_FREEPOOL_DEFAULT     0
   #define VM_FREEPOOL_DIRECT      1
   
   /*
    * Create up to three free page lists: VM_FREELIST_DMA32 is for physical pages
    * that have physical addresses below 4G but are not accessible by ISA DMA,
    * and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
    * DMA.
    */
   #define VM_NFREELIST            3
   #define VM_FREELIST_DEFAULT     0
   #define VM_FREELIST_DMA32       1
   #define VM_FREELIST_LOWMEM      2
   
   #define VM_LOWMEM_BOUNDARY      (16 << 20)      /* 16MB ISA DMA limit */
   
   /*
    * Create the DMA32 free list only if the number of physical pages above
    * physical address 4G is at least 16M, which amounts to 64GB of physical
    * memory.
    */
   #define VM_DMA32_NPAGES_THRESHOLD       16777216
   
   /*
    * An allocation size of 16MB is supported in order to optimize the
    * use of the direct map by UMA.  Specifically, a cache line contains
    * at most 8 PDEs, collectively mapping 16MB of physical memory.  By
    * reducing the number of distinct 16MB "pages" that are used by UMA,
    * the physical memory allocator reduces the likelihood of both 2MB
    * page TLB misses and cache misses caused by 2MB page TLB misses.
    */
   #define VM_NFREEORDER           13
   
   /*
    * Enable superpage reservations: 1 level.
    */
   #ifndef VM_NRESERVLEVEL
   #define VM_NRESERVLEVEL         1
   #endif
   
   /*
    * Level 0 reservations consist of 512 pages.
    */
   #ifndef VM_LEVEL_0_ORDER
   #define VM_LEVEL_0_ORDER        9
   #endif
   
   #ifdef  SMP
   #define PA_LOCK_COUNT   256
   #endif
   
   /*
    * Kernel physical load address for non-UEFI boot and for legacy UEFI loader.
    * Newer UEFI loader loads kernel anywhere below 4G, with memory allocated
    * by boot services.
    * Needs to be aligned at 2MB superpage boundary.
    */
   #ifndef KERNLOAD
   #define KERNLOAD        0x200000
   #endif
   
   /*
    * Virtual addresses of things.  Derived from the page directory and
    * page table indexes from pmap.h for precision.
    *
    * 0x0000000000000000 - 0x00007fffffffffff   user map
    * 0x0000800000000000 - 0xffff7fffffffffff   does not exist (hole)
    * 0xffff800000000000 - 0xffff804020100fff   recursive page table (512GB slot)
    * 0xffff804020100fff - 0xffff807fffffffff   unused
    * 0xffff808000000000 - 0xffff847fffffffff   large map (can be tuned up)
    * 0xffff848000000000 - 0xfffff77fffffffff   unused (large map extends there)
    * 0xfffff60000000000 - 0xfffff7ffffffffff   2TB KMSAN origin map, optional
    * 0xfffff78000000000 - 0xfffff7bfffffffff   512GB KASAN shadow map, optional
    * 0xfffff80000000000 - 0xfffffbffffffffff   4TB direct map
    * 0xfffffc0000000000 - 0xfffffdffffffffff   2TB KMSAN shadow map, optional
    * 0xfffffe0000000000 - 0xffffffffffffffff   2TB kernel map
    *
    * Within the kernel map:
    *
    * 0xfffffe0000000000                        vm_page_array
    * 0xffffffff80000000                        KERNBASE
    */
   
   #define VM_MIN_KERNEL_ADDRESS   KV4ADDR(KPML4BASE, 0, 0, 0)
   #define VM_MAX_KERNEL_ADDRESS   KV4ADDR(KPML4BASE + NKPML4E - 1, \
                                           NPDPEPG-1, NPDEPG-1, NPTEPG-1)
   
   #define DMAP_MIN_ADDRESS        KV4ADDR(DMPML4I, 0, 0, 0)
   #define DMAP_MAX_ADDRESS        KV4ADDR(DMPML4I + NDMPML4E, 0, 0, 0)
   
   #define KASAN_MIN_ADDRESS       KV4ADDR(KASANPML4I, 0, 0, 0)
   #define KASAN_MAX_ADDRESS       KV4ADDR(KASANPML4I + NKASANPML4E, 0, 0, 0)
   
   #define KMSAN_SHAD_MIN_ADDRESS  KV4ADDR(KMSANSHADPML4I, 0, 0, 0)
   #define KMSAN_SHAD_MAX_ADDRESS  KV4ADDR(KMSANSHADPML4I + NKMSANSHADPML4E, \
                                           0, 0, 0)
   
   #define KMSAN_ORIG_MIN_ADDRESS  KV4ADDR(KMSANORIGPML4I, 0, 0, 0)
   #define KMSAN_ORIG_MAX_ADDRESS  KV4ADDR(KMSANORIGPML4I + NKMSANORIGPML4E, \
                                           0, 0, 0)
   
   #define LARGEMAP_MIN_ADDRESS    KV4ADDR(LMSPML4I, 0, 0, 0)
   #define LARGEMAP_MAX_ADDRESS    KV4ADDR(LMEPML4I + 1, 0, 0, 0)
   
   /*
    * Formally kernel mapping starts at KERNBASE, but kernel linker
    * script leaves first PDE reserved.  For legacy BIOS boot, kernel is
    * loaded at KERNLOAD = 2M, and initial kernel page table maps
    * physical memory from zero to KERNend starting at KERNBASE.
    *
    * KERNSTART is where the first actual kernel page is mapped, after
    * the compatibility mapping.
    */
   #define KERNBASE                KV4ADDR(KPML4I, KPDPI, 0, 0)
   #define KERNSTART               (KERNBASE + NBPDR)
   
   #define UPT_MAX_ADDRESS         KV4ADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
   #define UPT_MIN_ADDRESS         KV4ADDR(PML4PML4I, 0, 0, 0)
   
   #define VM_MAXUSER_ADDRESS_LA57 UVADDR(NUPML5E, 0, 0, 0, 0)
   #define VM_MAXUSER_ADDRESS_LA48 UVADDR(0, NUP4ML4E, 0, 0, 0)
   #define VM_MAXUSER_ADDRESS      VM_MAXUSER_ADDRESS_LA57
   
   #define SHAREDPAGE_LA57         (VM_MAXUSER_ADDRESS_LA57 - PAGE_SIZE)
   #define SHAREDPAGE_LA48         (VM_MAXUSER_ADDRESS_LA48 - PAGE_SIZE)
   #define USRSTACK_LA57           SHAREDPAGE_LA57
   #define USRSTACK_LA48           SHAREDPAGE_LA48
   #define USRSTACK                USRSTACK_LA48
   #define PS_STRINGS_LA57         (USRSTACK_LA57 - sizeof(struct ps_strings))
   #define PS_STRINGS_LA48         (USRSTACK_LA48 - sizeof(struct ps_strings))
   
   #define VM_MAX_ADDRESS          UPT_MAX_ADDRESS
   #define VM_MIN_ADDRESS          (0)
   
   /*
    * XXX Allowing dmaplimit == 0 is a temporary workaround for vt(4) efifb's
    * early use of PHYS_TO_DMAP before the mapping is actually setup. This works
    * because the result is not actually accessed until later, but the early
    * vt fb startup needs to be reworked.
    */
   #define PHYS_IN_DMAP(pa)        (dmaplimit == 0 || (pa) < dmaplimit)
   #define VIRT_IN_DMAP(va)        ((va) >= DMAP_MIN_ADDRESS &&            \
       (va) < (DMAP_MIN_ADDRESS + dmaplimit))
   
   #define PMAP_HAS_DMAP   1
   #define PHYS_TO_DMAP(x) ({                                              \
           KASSERT(PHYS_IN_DMAP(x),                                        \
               ("physical address %#jx not covered by the DMAP",           \
               (uintmax_t)x));                                             \
           (x) | DMAP_MIN_ADDRESS; })
   
   #define DMAP_TO_PHYS(x) ({                                              \
           KASSERT(VIRT_IN_DMAP(x),                                        \
               ("virtual address %#jx not covered by the DMAP",            \
               (uintmax_t)x));                                             \
           (x) & ~DMAP_MIN_ADDRESS; })
   
   /*
    * amd64 maps the page array into KVA so that it can be more easily
    * allocated on the correct memory domains.
    */
   #define PMAP_HAS_PAGE_ARRAY     1
   
   /*
    * How many physical pages per kmem arena virtual page.
    */
   #ifndef VM_KMEM_SIZE_SCALE
   #define VM_KMEM_SIZE_SCALE      (1)
   #endif
   
   /*
    * Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
    * kernel map.
    */
   #ifndef VM_KMEM_SIZE_MAX
   #define VM_KMEM_SIZE_MAX        ((VM_MAX_KERNEL_ADDRESS - \
       VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
   #endif
   
   /* initial pagein size of beginning of executable file */
   #ifndef VM_INITIAL_PAGEIN
   #define VM_INITIAL_PAGEIN       16
   #endif
   
   #define ZERO_REGION_SIZE        (2 * 1024 * 1024)       /* 2MB */
   
   /*
    * The pmap can create non-transparent large page mappings.
    */
   #define PMAP_HAS_LARGEPAGES     1
   
   /*
    * Need a page dump array for minidump.
    */
   #define MINIDUMP_PAGE_TRACKING  1
   
   #endif /* _MACHINE_VMPARAM_H_ */
   
   #endif /* __i386__ */

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