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

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      * Copyright (C) 1995, 1996 TooLs GmbH.
      * All rights reserved.
      *
      * 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 TooLs GmbH.
     * 4. The name of TooLs GmbH may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
     *
     *      $NetBSD: vmparam.h,v 1.11 2000/02/11 19:25:16 thorpej Exp $
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_
    
    #ifndef LOCORE
    #include <machine/md_var.h>
    #endif
    
    #define USRSTACK        SHAREDPAGE
    
    #ifndef MAXTSIZ
    #define MAXTSIZ         (1*1024*1024*1024)              /* max text size */
    #endif
    
    #ifndef DFLDSIZ
    #define DFLDSIZ         (128*1024*1024)         /* default data size */
    #endif
    
    #ifndef MAXDSIZ
    #ifdef __powerpc64__
    #define MAXDSIZ         (32UL*1024*1024*1024)   /* max data size */
    #else
    #define MAXDSIZ         (1*1024*1024*1024)      /* max data size */
    #endif
    #endif
    
    #ifndef DFLSSIZ
    #define DFLSSIZ         (8*1024*1024)           /* default stack size */
    #endif
    
    #ifndef MAXSSIZ
    #ifdef __powerpc64__
    #define MAXSSIZ         (512*1024*1024)         /* max stack size */
    #else
    #define MAXSSIZ         (64*1024*1024)          /* max stack size */
    #endif
    #endif
    
    #ifdef AIM
    #define VM_MAXUSER_ADDRESS32    0xfffff000
    #else
    #define VM_MAXUSER_ADDRESS32    0x7ffff000
    #endif
    
    /*
     * Would like to have MAX addresses = 0, but this doesn't (currently) work
     */
    #ifdef __powerpc64__
    /*
     * Virtual addresses of things.  Derived from the page directory and
     * page table indexes from pmap.h for precision.
     *
     * kernel map should be able to start at 0xc008000000000000 -
     * but at least the functional simulator doesn't like it
     *
     * 0x0000000000000000 - 0x000fffffffffffff   user map
     * 0xc000000000000000 - 0xc007ffffffffffff   direct map
     * 0xc008000000000000 - 0xc00fffffffffffff   kernel map
     *
     */
    #define VM_MIN_ADDRESS          0x0000000000000000
    #define VM_MAXUSER_ADDRESS      0x000fffffc0000000
    #define VM_MAX_ADDRESS          0xc00fffffffffffff
    #define VM_MIN_KERNEL_ADDRESS   0xc008000000000000
   #define VM_MAX_KERNEL_ADDRESS   0xc0080007ffffffff
   #define VM_MAX_SAFE_KERNEL_ADDRESS      VM_MAX_KERNEL_ADDRESS
   #else
   #define VM_MIN_ADDRESS          0
   #define VM_MAXUSER_ADDRESS      VM_MAXUSER_ADDRESS32
   #define VM_MAX_ADDRESS          0xffffffff
   #endif
   
   #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
   
   #define FREEBSD32_SHAREDPAGE    (VM_MAXUSER_ADDRESS32 - PAGE_SIZE)
   #define FREEBSD32_USRSTACK      FREEBSD32_SHAREDPAGE
   
   #define KERNBASE                0x00100100      /* start of kernel virtual */
   
   #ifdef AIM
   #ifndef __powerpc64__
   #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)KERNEL_SR << ADDR_SR_SHFT)
   #define VM_MAX_SAFE_KERNEL_ADDRESS (VM_MIN_KERNEL_ADDRESS + 2*SEGMENT_LENGTH -1)
   #define VM_MAX_KERNEL_ADDRESS   (VM_MIN_KERNEL_ADDRESS + 3*SEGMENT_LENGTH - 1)
   #endif
   
   /*
    * Use the direct-mapped BAT registers for UMA small allocs. This
    * takes pressure off the small amount of available KVA.
    */
   #define UMA_MD_SMALL_ALLOC
   
   #else /* Book-E */
   
   /* Use the direct map for UMA small allocs on powerpc64. */
   #ifdef __powerpc64__
   #define UMA_MD_SMALL_ALLOC
   #else
   #define VM_MIN_KERNEL_ADDRESS           0xc0000000
   #define VM_MAX_KERNEL_ADDRESS           0xffffefff
   #define VM_MAX_SAFE_KERNEL_ADDRESS      VM_MAX_KERNEL_ADDRESS
   #endif
   
   #endif /* AIM/E500 */
   
   #if !defined(LOCORE)
   struct pmap_physseg {
           struct pv_entry *pvent;
           char *attrs;
   };
   #endif
   
   #ifdef __powerpc64__
   #define VM_PHYSSEG_MAX          63      /* 1? */
   #else
   #define VM_PHYSSEG_MAX          16      /* 1? */
   #endif
   
   #define PHYS_AVAIL_SZ   256     /* Allows up to 16GB Ram on pSeries with
                                    * logical memory block size of 64MB.
                                    * For more Ram increase the lmb or this value.
                                    */
   
   /* XXX This is non-sensical.  Phys avail should hold contiguous regions. */
   #define PHYS_AVAIL_ENTRIES      PHYS_AVAIL_SZ
   
   /*
    * The physical address space is densely populated on 32-bit systems,
    * but may not be on 64-bit ones.
    */
   #ifdef __powerpc64__
   #define VM_PHYSSEG_SPARSE
   #else
   #define VM_PHYSSEG_DENSE
   #endif
   
   /*
    * 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 one free page list.
    */
   #define VM_NFREELIST            1
   #define VM_FREELIST_DEFAULT     0
   
   #ifdef __powerpc64__
   /* The largest allocation size is 16MB. */
   #define VM_NFREEORDER           13
   #else
   /* The largest allocation size is 4MB. */
   #define VM_NFREEORDER           11
   #endif
   
   #ifndef VM_NRESERVLEVEL
   #ifdef __powerpc64__
   /* Enable superpage reservations: 1 level. */
   #define VM_NRESERVLEVEL         1
   #else
   /* Disable superpage reservations. */
   #define VM_NRESERVLEVEL         0
   #endif
   #endif
   
   #ifndef VM_LEVEL_0_ORDER
   /* Level 0 reservations consist of 512 (RPT) or 4096 (HPT) pages. */
   #define VM_LEVEL_0_ORDER        vm_level_0_order
   #ifndef __ASSEMBLER__
   extern  int vm_level_0_order;
   #endif
   #endif
   
   #ifndef VM_LEVEL_0_ORDER_MAX
   #define VM_LEVEL_0_ORDER_MAX    12
   #endif
   
   #ifdef __powerpc64__
   #ifdef  SMP
   #define PA_LOCK_COUNT   256
   #endif
   #endif
   
   #ifndef VM_INITIAL_PAGEIN
   #define VM_INITIAL_PAGEIN       16
   #endif
   
   #ifndef SGROWSIZ
   #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   #endif
   
   /*
    * 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        (12 * 1024 * 1024)
   #endif
   
   /*
    * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
    * usable KVA space.
    */
   #ifndef VM_KMEM_SIZE_MAX
   #define VM_KMEM_SIZE_MAX        ((VM_MAX_SAFE_KERNEL_ADDRESS - \
       VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
   #endif
   
   #ifdef __powerpc64__
   #define ZERO_REGION_SIZE        (2 * 1024 * 1024)       /* 2MB */
   #else
   #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
   #endif
   
   /*
    * On 32-bit OEA, the only purpose for which sf_buf is used is to implement
    * an opaque pointer required by the machine-independent parts of the kernel.
    * That pointer references the vm_page that is "mapped" by the sf_buf.  The
    * actual mapping is provided by the direct virtual-to-physical mapping.
    *
    * On OEA64 and Book-E, we need to do something a little more complicated. Use
    * the runtime-detected hw_direct_map to pick between the two cases. Our
    * friends in vm_machdep.c will do the same to ensure nothing gets confused.
    */
   #define SFBUF
   #define SFBUF_NOMD
   
   /*
    * We (usually) have a direct map of all physical memory, so provide
    * a macro to use to get the kernel VA address for a given PA. Check the
    * value of PMAP_HAS_PMAP before using.
    */
   #ifndef LOCORE
   #ifdef __powerpc64__
   #define DMAP_BASE_ADDRESS       0xc000000000000000UL
   #define DMAP_MIN_ADDRESS        DMAP_BASE_ADDRESS
   #define DMAP_MAX_ADDRESS        0xc007ffffffffffffUL
   #else
   #define DMAP_BASE_ADDRESS       0x00000000UL
   #define DMAP_MAX_ADDRESS        0xbfffffffUL
   #endif
   #endif
   
   #if defined(__powerpc64__) || defined(BOOKE)
   /*
    * powerpc64 and Book-E will provide their own page array allocators.
    *
    * On AIM, this will allocate a single virtual array, with pages from the
    * correct memory domains.
    * On Book-E this will let us put the array in TLB1, removing the need for TLB
    * thrashing.
    *
    * VM_MIN_KERNEL_ADDRESS is just a dummy.  It will get set by the MMU driver.
    */
   #define PA_MIN_ADDRESS          VM_MIN_KERNEL_ADDRESS
   #define PMAP_HAS_PAGE_ARRAY     1
   #endif
   
   #if defined(__powerpc64__)
   /*
    * Need a page dump array for minidump.
    */
   #define MINIDUMP_PAGE_TRACKING  1
   #else
   /*
    * No minidump with 32-bit powerpc.
    */
   #define MINIDUMP_PAGE_TRACKING  0
   #endif
   
   #define PMAP_HAS_DMAP   (hw_direct_map)
   #define PHYS_TO_DMAP(x) ({                                              \
           KASSERT(hw_direct_map, ("Direct map not provided by PMAP"));    \
           (x) | DMAP_BASE_ADDRESS; })
   #define DMAP_TO_PHYS(x) ({                                              \
           KASSERT(hw_direct_map, ("Direct map not provided by PMAP"));    \
           (x) &~ DMAP_BASE_ADDRESS; })
   
   /*
    * No non-transparent large page support in the pmap.
    */
   #define PMAP_HAS_LARGEPAGES     0
   
   #endif /* _MACHINE_VMPARAM_H_ */

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