cfb00e5aa7
architectures (i386, for example) the virtual memory space may be constrained enough that 2MB is a large chunk. Use 64K for arches other than amd64 and ia64, with special handling for sparc64 due to differing hardware. Also commit the comment changes to kmem_init_zero_region() that I missed due to not saving the file. (Darn the unfamiliar development environment). Arch maintainers, please feel free to adjust ZERO_REGION_SIZE as you see fit. Requested by: alc MFC after: 1 week MFC with: r221853
221 lines
7.3 KiB
C
221 lines
7.3 KiB
C
/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. 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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* the Systems Programming Group of the University of Utah Computer
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* Science Department and Ralph Campbell.
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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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* 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: Utah $Hdr: vmparam.h 1.16 91/01/18$
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*
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* @(#)vmparam.h 8.2 (Berkeley) 4/22/94
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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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/*
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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<<30) /* max text size (1G) */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ (1<<27) /* initial data size (128M) */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ (1<<30) /* max data size (1G) */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ (1<<21) /* initial stack size (2M) */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ (1<<28) /* max stack size (256M) */
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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 need region 7 virtual addresses for pagetables.
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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 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 is equal to the number of phys_avail
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* entries.
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*/
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#define VM_PHYSSEG_MAX 49
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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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* Create one free page list.
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*/
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#define VM_NFREELIST 1
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#define VM_FREELIST_DEFAULT 0
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/*
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* An allocation size of 256MB is supported in order to optimize the
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* use of the identity mappings in region 7 by UMA.
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*/
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#define VM_NFREEORDER 16
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/*
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* Only one memory domain.
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*/
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#ifndef VM_NDOMAIN
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#define VM_NDOMAIN 1
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#endif
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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 IA64_VM_MINKERN_REGION 4
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/*
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* Manipulating region bits of an address.
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*/
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#define IA64_RR_BASE(n) (((uint64_t) (n)) << 61)
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#define IA64_RR_MASK(x) ((x) & ((1L << 61) - 1))
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#define IA64_PHYS_TO_RR6(x) ((x) | IA64_RR_BASE(6))
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#define IA64_PHYS_TO_RR7(x) ((x) | IA64_RR_BASE(7))
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/*
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* The Itanium architecture defines that all implementations support at
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* least 51 virtual address bits (i.e. IMPL_VA_MSB=50). The unimplemented
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* bits are sign-extended from VA{IMPL_VA_MSB}. As such, there's a gap in
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* the virtual address range, which extends at most from 0x0004000000000000
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* to 0x1ffbffffffffffff. We define the top half of a region in terms of
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* this worst-case gap.
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*/
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#define IA64_REGION_GAP_START 0x0004000000000000
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#define IA64_REGION_GAP_EXTEND 0x1ffc000000000000
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/*
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* Parameters for Pre-Boot Virtual Memory (PBVM).
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* The kernel, its modules and metadata are loaded in the PBVM by the loader.
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* The PBVM consists of pages for which the mapping is maintained in a page
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* table. The page table is at least 1 EFI page large (i.e. 4KB), but can be
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* larger to accommodate more PBVM. The maximum page table size is 1MB. With
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* 8 bytes per page table entry, this means that the PBVM has at least 512
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* pages and at most 128K pages.
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* The GNU toolchain (in particular GNU ld) does not support an alignment
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* larger than 64K. This means that we cannot guarantee page alignment for
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* a page size that's larger than 64K. We do want to have text and data in
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* different pages, which means that the maximum usable page size is 64KB.
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* Consequently:
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* The maximum total PBVM size is 8GB -- enough for a DVD image. A page table
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* of a single EFI page (4KB) allows for 32MB of PBVM.
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*
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* The kernel is given the PA and size of the page table that provides the
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* mapping of the PBVM. The page table itself is assumed to be mapped at a
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* known virtual address and using a single translation wired into the CPU.
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* As such, the page table is assumed to be a power of 2 and naturally aligned.
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* The kernel also assumes that a good portion of the kernel text is mapped
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* and wired into the CPU, but does not assume that the mapping covers the
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* whole of PBVM.
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*/
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#define IA64_PBVM_RR IA64_VM_MINKERN_REGION
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#define IA64_PBVM_BASE \
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(IA64_RR_BASE(IA64_PBVM_RR) + IA64_REGION_GAP_EXTEND)
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#define IA64_PBVM_PGTBL_MAXSZ 1048576
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#define IA64_PBVM_PGTBL \
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(IA64_RR_BASE(IA64_PBVM_RR + 1) - IA64_PBVM_PGTBL_MAXSZ)
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#define IA64_PBVM_PAGE_SHIFT 16 /* 64KB */
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#define IA64_PBVM_PAGE_SIZE (1 << IA64_PBVM_PAGE_SHIFT)
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#define IA64_PBVM_PAGE_MASK (IA64_PBVM_PAGE_SIZE - 1)
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/*
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* Mach derived constants
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*/
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/* user/kernel map constants */
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#define VM_MIN_ADDRESS 0
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#define VM_MAXUSER_ADDRESS IA64_RR_BASE(IA64_VM_MINKERN_REGION)
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#define VM_MIN_KERNEL_ADDRESS IA64_RR_BASE(IA64_VM_MINKERN_REGION + 1)
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#define VM_MAX_KERNEL_ADDRESS \
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(VM_MIN_KERNEL_ADDRESS + IA64_REGION_GAP_START - 1)
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#define VM_MAX_ADDRESS ~0UL
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#define KERNBASE VM_MAXUSER_ADDRESS
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/*
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* USRSTACK is the top (end) of the user stack. Immediately above the user
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* stack resides the syscall gateway page.
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*/
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#define USRSTACK VM_MAXUSER_ADDRESS
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#define IA64_BACKINGSTORE (USRSTACK - (2 * MAXSSIZ) - PAGE_SIZE)
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/* virtual sizes (bytes) for various kernel submaps */
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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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/*
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* How many physical pages per KVA page allocated.
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* min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
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* VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
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* is the total KVA space allocated for kmem_map.
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*/
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#ifndef VM_KMEM_SIZE_SCALE
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#define VM_KMEM_SIZE_SCALE (4) /* XXX 8192 byte pages */
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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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#endif /* !_MACHINE_VMPARAM_H_ */
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