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but I see no benefit from it today. VM_PROT_READ_IS_EXEC was only intended for use on processors that do not distinguish between read and execute permission. On an mmap(2) or mprotect(2), it automatically added execute permission if the caller specified permissions included read permission. The hope was that this would reduce the number of vm map entries needed to implement an address space because there would be fewer neighboring vm map entries that differed only in the presence or absence of VM_PROT_EXECUTE. (See vm/vm_mmap.c revision 1.56.) Today, I don't see any real applications that benefit from VM_PROT_READ_IS_EXEC. In any case, vm map entries are now organized as a self-adjusting binary search tree instead of an ordered list. So, the need for coalescing vm map entries is not as great as it once was.
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/* $NetBSD: vmparam.h,v 1.26 2003/08/07 16:27:47 agc Exp $ */
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/*-
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* Copyright (c) 1988 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_VMPARAM_H_
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#define _MACHINE_VMPARAM_H_
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/*#include <arm/arm32/vmparam.h>
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*/
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/*
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* Address space constants
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*/
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/*
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* The line between user space and kernel space
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* Mappings >= KERNEL_BASE are constant across all processes
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*/
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#define KERNBASE 0xc0000000
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/*
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* max number of non-contig chunks of physical RAM you can have
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*/
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#define VM_PHYSSEG_MAX 32
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/*
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* The physical address space is densely populated.
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*/
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#define VM_PHYSSEG_DENSE
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/*
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* Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
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* from which physical pages are allocated and VM_FREEPOOL_DIRECT is
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* the pool from which physical pages for small UMA objects are
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* allocated.
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*/
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#define VM_NFREEPOOL 3
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#define VM_FREEPOOL_CACHE 2
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#define VM_FREEPOOL_DEFAULT 0
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#define VM_FREEPOOL_DIRECT 1
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/*
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* we support 2 free lists:
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*
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* - DEFAULT for all systems
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* - ISADMA for the ISA DMA range on Sharks only
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*/
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#define VM_NFREELIST 2
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_ISADMA 1
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/*
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* The largest allocation size is 1MB.
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*/
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#define VM_NFREEORDER 9
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/*
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* Disable superpage reservations.
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*/
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#ifndef VM_NRESERVLEVEL
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#define VM_NRESERVLEVEL 0
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#endif
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#define UPT_MAX_ADDRESS VADDR(UPTPTDI + 3, 0)
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#define UPT_MIN_ADDRESS VADDR(UPTPTDI, 0)
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#define VM_MIN_ADDRESS (0x00001000)
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#ifdef ARM_USE_SMALL_ALLOC
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/*
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* ARM_KERN_DIRECTMAP is used to make sure there's enough space between
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* VM_MAXUSER_ADDRESS and KERNBASE to map the whole memory.
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* It has to be a compile-time constant, even if arm_init_smallalloc(),
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* which will do the mapping, gets the real amount of memory at runtime,
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* because VM_MAXUSER_ADDRESS is a constant.
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*/
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#ifndef ARM_KERN_DIRECTMAP
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#define ARM_KERN_DIRECTMAP 512 * 1024 * 1024 /* 512 MB */
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#endif
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#define VM_MAXUSER_ADDRESS KERNBASE - ARM_KERN_DIRECTMAP
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#else /* ARM_USE_SMALL_ALLOC */
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#define VM_MAXUSER_ADDRESS KERNBASE
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#endif /* ARM_USE_SMALL_ALLOC */
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#define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
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#define USRSTACK VM_MAXUSER_ADDRESS
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/* initial pagein size of beginning of executable file */
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#ifndef VM_INITIAL_PAGEIN
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#define VM_INITIAL_PAGEIN 16
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#endif
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#ifndef VM_MIN_KERNEL_ADDRESS
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#define VM_MIN_KERNEL_ADDRESS KERNBASE
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#endif
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#define VM_MAX_KERNEL_ADDRESS 0xffffffff
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/*
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* Virtual size (bytes) for various kernel submaps.
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*/
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#ifndef VM_KMEM_SIZE
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#define VM_KMEM_SIZE (12*1024*1024)
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#endif
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#define MAXTSIZ (16*1024*1024)
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#define DFLDSIZ (128*1024*1024)
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#define MAXDSIZ (512*1024*1024)
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#define DFLSSIZ (2*1024*1024)
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#define MAXSSIZ (8*1024*1024)
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#define SGROWSIZ (128*1024)
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#define MAXSLP 20
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#ifdef ARM_USE_SMALL_ALLOC
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#define UMA_MD_SMALL_ALLOC
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#endif /* ARM_USE_SMALL_ALLOC */
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#endif /* _MACHINE_VMPARAM_H_ */
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