FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/vmparam.h

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      * Copyright (c) 1994 John S. Dyson
      * 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. 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
     *      from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
     * $FreeBSD: releng/11.2/sys/arm64/include/vmparam.h 302291 2016-06-30 04:58:19Z wma $
     */
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #ifndef MAXTSIZ
    #define MAXTSIZ         (1*1024*1024*1024)      /* max text size */
    #endif
    #ifndef DFLDSIZ
    #define DFLDSIZ         (128*1024*1024)         /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (1*1024*1024*1024)      /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (128*1024*1024)         /* initial stack size limit */
    #endif
    #ifndef MAXSSIZ
    #define MAXSSIZ         (1*1024*1024*1024)      /* max stack size */
    #endif
    #ifndef SGROWSIZ
    #define SGROWSIZ        (128*1024)              /* amount to grow stack */
    #endif
    
    /*
     * The physical address space is sparsely populated.
     */
    #define VM_PHYSSEG_SPARSE
    
    /*
     * 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          64
    
    /*
     * 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 small UMA objects are
     * allocated.
     */
    #define VM_NFREEPOOL            2
    #define VM_FREEPOOL_DEFAULT     0
    #define VM_FREEPOOL_DIRECT      1
    
    /*
     * Create two free page lists: VM_FREELIST_DEFAULT is for physical
     * pages that are above the largest physical address that is
     * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
     * that are below that address.
     */
    #define VM_NFREELIST            2
    #define VM_FREELIST_DEFAULT     0
    #define VM_FREELIST_ISADMA      1
    
    /*
     * 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 four TTEs, 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 4MB
    * page TLB misses and cache misses caused by 4MB page TLB misses.
    */
   #define VM_NFREEORDER           12
   
   /*
    * 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
   
   /**
    * Address space layout.
    *
    * ARMv8 implements up to a 48 bit virtual address space. The address space is
    * split into 2 regions at each end of the 64 bit address space, with an
    * out of range "hole" in the middle.
    *
    * We use the full 48 bits for each region, however the kernel may only use
    * a limited range within this space.
    *
    * Upper region:    0xffffffffffffffff  Top of virtual memory
    *
    *                  0xfffffeffffffffff  End of DMAP
    *                  0xfffffd0000000000  Start of DMAP
    *
    *                  0xffff007fffffffff  End of KVA
    *                  0xffff000000000000  Kernel base address & start of KVA
    *
    * Hole:            0xfffeffffffffffff
    *                  0x0001000000000000
    *
    * Lower region:    0x0000ffffffffffff End of user address space
    *                  0x0000000000000000 Start of user address space
    *
    * We use the upper region for the kernel, and the lower region for userland.
    *
    * We define some interesting address constants:
    *
    * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
    * 64 bit address space, mostly just for convenience.
    *
    * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
    * mappable kernel virtual address space.
    *
    * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
    * user address space.
    */
   #define VM_MIN_ADDRESS          (0x0000000000000000UL)
   #define VM_MAX_ADDRESS          (0xffffffffffffffffUL)
   
   /* 512 GiB of kernel addresses */
   #define VM_MIN_KERNEL_ADDRESS   (0xffff000000000000UL)
   #define VM_MAX_KERNEL_ADDRESS   (0xffff008000000000UL)
   
   /* 2 TiB maximum for the direct map region */
   #define DMAP_MIN_ADDRESS        (0xfffffd0000000000UL)
   #define DMAP_MAX_ADDRESS        (0xffffff0000000000UL)
   
   #define DMAP_MIN_PHYSADDR       (dmap_phys_base)
   #define DMAP_MAX_PHYSADDR       (dmap_phys_max)
   
   /* True if pa is in the dmap range */
   #define PHYS_IN_DMAP(pa)        ((pa) >= DMAP_MIN_PHYSADDR && \
       (pa) < DMAP_MAX_PHYSADDR)
   /* True if va is in the dmap range */
   #define VIRT_IN_DMAP(va)        ((va) >= DMAP_MIN_ADDRESS && \
       (va) < (dmap_max_addr))
   
   #define PHYS_TO_DMAP(pa)                                                \
   ({                                                                      \
           KASSERT(PHYS_IN_DMAP(pa),                                       \
               ("%s: PA out of range, PA: 0x%lx", __func__,                \
               (vm_paddr_t)(pa)));                                         \
           ((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS;                     \
   })
   
   #define DMAP_TO_PHYS(va)                                                \
   ({                                                                      \
           KASSERT(VIRT_IN_DMAP(va),                                       \
               ("%s: VA out of range, VA: 0x%lx", __func__,                \
               (vm_offset_t)(va)));                                        \
           ((va) - DMAP_MIN_ADDRESS) + dmap_phys_base;                     \
   })
   
   #define VM_MIN_USER_ADDRESS     (0x0000000000000000UL)
   #define VM_MAX_USER_ADDRESS     (0x0001000000000000UL)
   
   #define VM_MINUSER_ADDRESS      (VM_MIN_USER_ADDRESS)
   #define VM_MAXUSER_ADDRESS      (VM_MAX_USER_ADDRESS)
   
   #define KERNBASE                (VM_MIN_KERNEL_ADDRESS)
   #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
   #define USRSTACK                SHAREDPAGE
   
   /*
    * How many physical pages per kmem arena virtual page.
    */
   #ifndef VM_KMEM_SIZE_SCALE
   #define VM_KMEM_SIZE_SCALE      (3)
   #endif
   
   /*
    * Optional floor (in bytes) on the size of the kmem arena.
    */
   #ifndef VM_KMEM_SIZE_MIN
   #define VM_KMEM_SIZE_MIN        (16 * 1024 * 1024)
   #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 UMA_MD_SMALL_ALLOC
   
   #ifndef LOCORE
   
   extern vm_paddr_t dmap_phys_base;
   extern vm_paddr_t dmap_phys_max;
   extern vm_offset_t dmap_max_addr;
   extern u_int tsb_kernel_ldd_phys;
   extern vm_offset_t vm_max_kernel_address;
   extern vm_offset_t init_pt_va;
   
   #endif
   
   #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
   
   #define DEVMAP_MAX_VADDR        VM_MAX_KERNEL_ADDRESS
   
   #endif /* !_MACHINE_VMPARAM_H_ */

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