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sys/arm64/include/vmparam.h

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/*-
* 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
* $FreeBSD$
*/
#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 three 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 3
#define VM_FREEPOOL_CACHE 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 limit the size of the two spaces to 39 bits each.
*
* Upper region: 0xffffffffffffffff
* 0xffffff8000000000
*
* Hole: 0xffffff7fffffffff
* 0x0000008000000000
*
* Lower region: 0x0000007fffffffff
* 0x0000000000000000
*
* 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_KERNEL_ADDRESS is basically
* arbitrary, a convenient address is chosen which allows both the kernel text
* and data and the prom's address space to be mapped with 1 4mb tsb page.
* VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the
* amount of physical memory available. Each 4mb tsb page provides 1g of
* virtual address space, with the only practical limit being available
* phsyical memory.
andrewAuthorUnsubmitted
Not Done
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This comment is most likely wrong, it was left here after I copied the file.

andrew: This comment is most likely wrong, it was left here after I copied the file.
*
* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
* user address space. There are some hardware errata about using addresses
* at the boundary of the va hole, so we allow just under 43 bits of user
* address space. Note that the kernel and user address spaces overlap, but
* this doesn't matter because they use different tlb contexts, and because
* the kernel address space is not mapped into each process' address space.
andrewAuthorUnsubmitted
Not Done
Inline Actions

As is this one

andrew: As is this one
*/
#define VM_MIN_ADDRESS (0x0000000000000000UL)
#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
/* 32 GiB of kernel addresses */
#define VM_MIN_KERNEL_ADDRESS (0xffffff8000000000UL)
#define VM_MAX_KERNEL_ADDRESS (0xffffff8800000000UL)
/* Direct Map for 64 GiB of PA: 0x0 - 0xfffffffff */
#define DMAP_MIN_ADDRESS (0xffffffc000000000UL)
#define DMAP_MAX_ADDRESS (0xffffffcfffffffffUL)
#define DMAP_MIN_PHYSADDR (0x0000000000000000UL)
#define DMAP_MAX_PHYSADDR (DMAP_MAX_ADDRESS - DMAP_MIN_ADDRESS)
/* True if pa is in the dmap range */
#define PHYS_IN_DMAP(pa) ((pa) <= DMAP_MAX_PHYSADDR)
#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_MIN_ADDRESS; \
})
#define DMAP_TO_PHYS(va) \
({ \
KASSERT(((va) <= DMAP_MAX_ADDRESS || (va) >= DMAP_MIN_ADDRESS), \
("%s: VA out of range, VA: 0x%lx", __func__, \
(vm_offset_t)(va))); \
(va) & ~DMAP_MIN_ADDRESS; \
})
#define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
#define VM_MAX_USER_ADDRESS (0x0000008000000000UL)
#define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
#define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
#define USRSTACK (VM_MAX_USER_ADDRESS)
/*
* 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
extern u_int tsb_kernel_ldd_phys;
extern vm_offset_t vm_max_kernel_address;
extern vm_offset_t init_pt_va;
#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
#endif /* !_MACHINE_VMPARAM_H_ */