2fd0c8e7ca
The KPI allows to map very large contigous physical memory regions into KVA, which are not covered by DMAP. I see both with QEMU and with some real hardware started shipping, the regions for NVDIMMs might be very far apart from the normal RAM, and we expect that at least initial users of NVDIMM could install very large amount of such memory. IMO it is not reasonable to extend DMAP to cover that far-away regions both because it could overflow existing 4T window for DMAP in KVA, and because it costs in page table pages allocations, for gap and for possibly unused NV RAM. Also, KPI provides some special functionality for fast cache flushing based on the knowledge of the NVRAM mapping use. Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation Approved by: re (gjb) MFC after: 1 week Differential revision: https://reviews.freebsd.org/D17070
244 lines
7.8 KiB
C
244 lines
7.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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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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* Copyright (c) 2003 Peter Wemm
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $FreeBSD$
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*/
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#ifndef _MACHINE_VMPARAM_H_
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#define _MACHINE_VMPARAM_H_ 1
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/*
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* Machine dependent constants for AMD64.
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*/
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/*
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* Virtual memory related constants, all in bytes
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*/
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#define MAXTSIZ (32768UL*1024*1024) /* max text size */
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#ifndef DFLDSIZ
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#define DFLDSIZ (32768UL*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (32768UL*1024*1024) /* max data size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (8UL*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (512UL*1024*1024) /* max stack size */
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#endif
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#ifndef SGROWSIZ
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#define SGROWSIZ (128UL*1024) /* amount to grow stack */
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#endif
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/*
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* We provide a machine specific single page allocator through the use
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* of the direct mapped segment. This uses 2MB pages for reduced
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* TLB pressure.
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*/
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#define UMA_MD_SMALL_ALLOC
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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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* 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 63
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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 page tables and small UMA
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* objects are 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 up to three free page lists: VM_FREELIST_DMA32 is for physical pages
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* that have physical addresses below 4G but are not accessible by ISA DMA,
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* and VM_FREELIST_ISADMA is for physical pages that are accessible by ISA
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* DMA.
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*/
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#define VM_NFREELIST 3
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#define VM_FREELIST_DEFAULT 0
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#define VM_FREELIST_DMA32 1
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#define VM_FREELIST_LOWMEM 2
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#define VM_LOWMEM_BOUNDARY (16 << 20) /* 16MB ISA DMA limit */
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/*
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* Create the DMA32 free list only if the number of physical pages above
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* physical address 4G is at least 16M, which amounts to 64GB of physical
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* memory.
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*/
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#define VM_DMA32_NPAGES_THRESHOLD 16777216
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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 8 PDEs, collectively mapping 16MB of physical memory. By
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* 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 2MB
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* page TLB misses and cache misses caused by 2MB page TLB misses.
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*/
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#define VM_NFREEORDER 13
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/*
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* Enable superpage reservations: 1 level.
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*/
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#ifndef VM_NRESERVLEVEL
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#define VM_NRESERVLEVEL 1
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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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#ifdef SMP
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#define PA_LOCK_COUNT 256
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#endif
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/*
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* Virtual addresses of things. Derived from the page directory and
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* page table indexes from pmap.h for precision.
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*
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* 0x0000000000000000 - 0x00007fffffffffff user map
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* 0x0000800000000000 - 0xffff7fffffffffff does not exist (hole)
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* 0xffff800000000000 - 0xffff804020100fff recursive page table (512GB slot)
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* 0xffff804020100fff - 0xffff807fffffffff unused
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* 0xffff808000000000 - 0xffff847fffffffff large map (can be tuned up)
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* 0xffff848000000000 - 0xfffff7ffffffffff unused (large map extends there)
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* 0xfffff80000000000 - 0xfffffbffffffffff 4TB direct map
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* 0xfffffc0000000000 - 0xfffffdffffffffff unused
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* 0xfffffe0000000000 - 0xffffffffffffffff 2TB kernel map
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*
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* Within the kernel map:
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*
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* 0xffffffff80000000 KERNBASE
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*/
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#define VM_MIN_KERNEL_ADDRESS KVADDR(KPML4BASE, 0, 0, 0)
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#define VM_MAX_KERNEL_ADDRESS KVADDR(KPML4BASE + NKPML4E - 1, \
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NPDPEPG-1, NPDEPG-1, NPTEPG-1)
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#define DMAP_MIN_ADDRESS KVADDR(DMPML4I, 0, 0, 0)
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#define DMAP_MAX_ADDRESS KVADDR(DMPML4I + NDMPML4E, 0, 0, 0)
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#define LARGEMAP_MIN_ADDRESS KVADDR(LMSPML4I, 0, 0, 0)
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#define LARGEMAP_MAX_ADDRESS KVADDR(LMEPML4I + 1, 0, 0, 0)
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#define KERNBASE KVADDR(KPML4I, KPDPI, 0, 0)
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#define UPT_MAX_ADDRESS KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
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#define UPT_MIN_ADDRESS KVADDR(PML4PML4I, 0, 0, 0)
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#define VM_MAXUSER_ADDRESS UVADDR(NUPML4E, 0, 0, 0)
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#define SHAREDPAGE (VM_MAXUSER_ADDRESS - PAGE_SIZE)
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#define USRSTACK SHAREDPAGE
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#define VM_MAX_ADDRESS UPT_MAX_ADDRESS
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#define VM_MIN_ADDRESS (0)
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/*
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* XXX Allowing dmaplimit == 0 is a temporary workaround for vt(4) efifb's
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* early use of PHYS_TO_DMAP before the mapping is actually setup. This works
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* because the result is not actually accessed until later, but the early
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* vt fb startup needs to be reworked.
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*/
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#define PMAP_HAS_DMAP 1
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#define PHYS_TO_DMAP(x) ({ \
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KASSERT(dmaplimit == 0 || (x) < dmaplimit, \
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("physical address %#jx not covered by the DMAP", \
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(uintmax_t)x)); \
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(x) | DMAP_MIN_ADDRESS; })
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#define DMAP_TO_PHYS(x) ({ \
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KASSERT((x) < (DMAP_MIN_ADDRESS + dmaplimit) && \
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(x) >= DMAP_MIN_ADDRESS, \
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("virtual address %#jx not covered by the DMAP", \
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(uintmax_t)x)); \
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(x) & ~DMAP_MIN_ADDRESS; })
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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 (1)
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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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/* 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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#define ZERO_REGION_SIZE (2 * 1024 * 1024) /* 2MB */
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/*
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* Use a fairly large batch size since we expect amd64 systems to have lots of
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* memory.
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*/
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#define VM_BATCHQUEUE_SIZE 31
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#endif /* _MACHINE_VMPARAM_H_ */
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