250 lines
7.4 KiB
C
250 lines
7.4 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 1994 John S. Dyson
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* from: @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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* from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
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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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/*
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* Virtual memory related constants, all in bytes
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*/
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#ifndef MAXTSIZ
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#define MAXTSIZ (1*1024*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (128*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (1*1024*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (128*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (1*1024*1024*1024) /* max stack size */
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#endif
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#ifndef SGROWSIZ
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#define SGROWSIZ (128*1024) /* amount to grow stack */
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#endif
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/*
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* The physical address space is sparsely populated.
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*/
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#define VM_PHYSSEG_SPARSE
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/*
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* The number of PHYSSEG entries must be one greater than the number
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* of phys_avail entries because the phys_avail entry that spans the
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* largest physical address that is accessible by ISA DMA is split
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* into two PHYSSEG entries.
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*/
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#define VM_PHYSSEG_MAX 64
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/*
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* Create two 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 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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* Create two free page lists: VM_FREELIST_DEFAULT is for physical
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* pages that are above the largest physical address that is
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* accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
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* that are below that address.
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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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* An allocation size of 16MB is supported in order to optimize the
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* use of the direct map by UMA. Specifically, a cache line contains
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* at most four TTEs, collectively mapping 16MB of physical memory.
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* By reducing the number of distinct 16MB "pages" that are used by UMA,
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* the physical memory allocator reduces the likelihood of both 4MB
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* page TLB misses and cache misses caused by 4MB page TLB misses.
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*/
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#define VM_NFREEORDER 12
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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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/*
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* Level 0 reservations consist of 512 pages.
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*/
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#ifndef VM_LEVEL_0_ORDER
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#define VM_LEVEL_0_ORDER 9
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#endif
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/**
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* Address space layout.
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*
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* RISC-V implements up to a 48 bit virtual address space. The address space is
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* split into 2 regions at each end of the 64 bit address space, with an
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* out of range "hole" in the middle.
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*
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* We limit the size of the two spaces to 39 bits each.
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*
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* Upper region: 0xffffffffffffffff
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* 0xffffff8000000000
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*
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* Hole: 0xffffff7fffffffff
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* 0x0000008000000000
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*
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* Lower region: 0x0000007fffffffff
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* 0x0000000000000000
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*
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* We use the upper region for the kernel, and the lower region for userland.
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*
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* We define some interesting address constants:
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*
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* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
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* 64 bit address space, mostly just for convenience.
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*
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* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
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* mappable kernel virtual address space.
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*
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* VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
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* user address space.
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*/
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#define VM_MIN_ADDRESS (0x0000000000000000UL)
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#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
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/* 32 GiB of kernel addresses */
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#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
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#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
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/* 128 GiB maximum for the direct map region */
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#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
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#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
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#define DMAP_MIN_PHYSADDR (dmap_phys_base)
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#define DMAP_MAX_PHYSADDR (dmap_phys_max)
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/* True if pa is in the dmap range */
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#define PHYS_IN_DMAP(pa) ((pa) >= DMAP_MIN_PHYSADDR && \
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(pa) < DMAP_MAX_PHYSADDR)
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/* True if va is in the dmap range */
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#define VIRT_IN_DMAP(va) ((va) >= DMAP_MIN_ADDRESS && \
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(va) < (dmap_max_addr))
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#define PHYS_TO_DMAP(pa) \
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({ \
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KASSERT(PHYS_IN_DMAP(pa), \
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("%s: PA out of range, PA: 0x%lx", __func__, \
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(vm_paddr_t)(pa))); \
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((pa) - dmap_phys_base) + DMAP_MIN_ADDRESS; \
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})
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#define DMAP_TO_PHYS(va) \
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({ \
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KASSERT(VIRT_IN_DMAP(va), \
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("%s: VA out of range, VA: 0x%lx", __func__, \
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(vm_offset_t)(va))); \
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((va) - DMAP_MIN_ADDRESS) + dmap_phys_base; \
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})
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#define VM_MIN_USER_ADDRESS (0x0000000000000000UL)
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#define VM_MAX_USER_ADDRESS (0x0000004000000000UL)
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#define VM_MINUSER_ADDRESS (VM_MIN_USER_ADDRESS)
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#define VM_MAXUSER_ADDRESS (VM_MAX_USER_ADDRESS)
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#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
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#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
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#define USRSTACK SHAREDPAGE
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#define KERNENTRY (0)
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/*
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* How many physical pages per kmem arena virtual page.
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*/
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#ifndef VM_KMEM_SIZE_SCALE
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#define VM_KMEM_SIZE_SCALE (3)
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#endif
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/*
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* Optional floor (in bytes) on the size of the kmem arena.
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*/
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#ifndef VM_KMEM_SIZE_MIN
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#define VM_KMEM_SIZE_MIN (16 * 1024 * 1024)
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#endif
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/*
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* Optional ceiling (in bytes) on the size of the kmem arena: 60% of the
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* kernel map.
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*/
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#ifndef VM_KMEM_SIZE_MAX
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#define VM_KMEM_SIZE_MAX ((VM_MAX_KERNEL_ADDRESS - \
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VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
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#endif
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/*
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* Initial pagein size of beginning of executable file.
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*/
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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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/*
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* RISCVTODO
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* #define UMA_MD_SMALL_ALLOC
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*/
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#ifndef LOCORE
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extern vm_paddr_t dmap_phys_base;
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extern vm_paddr_t dmap_phys_max;
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extern vm_offset_t dmap_max_addr;
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extern u_int tsb_kernel_ldd_phys;
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extern vm_offset_t vm_max_kernel_address;
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extern vm_offset_t init_pt_va;
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#endif
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#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
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#define DEVMAP_MAX_VADDR VM_MAX_KERNEL_ADDRESS
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#endif /* !_MACHINE_VMPARAM_H_ */
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