d64c132e24
o Eliminate IA64_PHYS_TO_RR6 and change all places where the macro is used
by calling either bus_space_map() or pmap_mapdev().
o Implement bus_space_map() in terms of pmap_mapdev() and implement
bus_space_unmap() in terms of pmap_unmapdev().
o Have ia64_pib hold the uncached virtual address of the processor interrupt
block throughout the kernel's life and access the elements of the PIB
through this structure pointer.
This is a non-functional change with the exception of using ia64_ld1() and
ia64_st8() to write to the PIB. We were still using assignments, for which
the compiler generates semaphore reads -- which cause undefined behaviour
for uncacheable memory. Note also that the memory barriers in ipi_send() are
critical for proper functioning.
With all the mapping of uncached memory done by pmap_mapdev(), we can keep
track of the translations and wire them in the CPU. This then eliminates
the need to reserve a whole region for uncached I/O and it eliminates
translation traps for device I/O accesses.
185 lines
5.5 KiB
C
185 lines
5.5 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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* 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_MAX_ADDRESS
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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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* The time for a process to be blocked before being very swappable.
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* This is a number of seconds which the system takes as being a non-trivial
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* amount of real time. You probably shouldn't change this;
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* it is used in subtle ways (fractions and multiples of it are, that is, like
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* half of a ``long time'', almost a long time, etc.)
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* It is related to human patience and other factors which don't really
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* change over time.
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*/
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#define MAXSLP 20
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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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* 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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* Manipulating region bits of an address.
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*/
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#define IA64_RR_BASE(n) (((u_int64_t) (n)) << 61)
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#define IA64_RR_MASK(x) ((x) & ((1L << 61) - 1))
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#define IA64_PHYS_TO_RR7(x) ((x) | IA64_RR_BASE(7))
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/*
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* Page size of the identity mappings in region 7.
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*/
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#ifndef LOG2_ID_PAGE_SIZE
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#define LOG2_ID_PAGE_SIZE 28 /* 256M */
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#endif
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#define IA64_ID_PAGE_SHIFT (LOG2_ID_PAGE_SIZE)
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#define IA64_ID_PAGE_SIZE (1<<(LOG2_ID_PAGE_SIZE))
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#define IA64_ID_PAGE_MASK (IA64_ID_PAGE_SIZE-1)
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#define IA64_BACKINGSTORE IA64_RR_BASE(4)
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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_MAX_ADDRESS IA64_RR_BASE(5)
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#define VM_GATEWAY_SIZE PAGE_SIZE
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#define VM_MAXUSER_ADDRESS (VM_MAX_ADDRESS + VM_GATEWAY_SIZE)
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#define VM_MIN_KERNEL_ADDRESS VM_MAXUSER_ADDRESS
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#define VM_MAX_KERNEL_ADDRESS (IA64_RR_BASE(6) - 1)
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#define KERNBASE VM_MAX_ADDRESS
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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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#endif /* !_MACHINE_VMPARAM_H_ */
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