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- /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- *
- * @(#)vmparam.h 5.9 (Berkeley) 5/12/91
- */
-
-
- /*
- * Machine dependent constants for 386.
- */
-
- /*
- * Virtual address space arrangement. On 386, both user and kernel
- * share the address space, not unlike the vax.
- * USRTEXT is the start of the user text/data space, while USRSTACK
- * is the top (end) of the user stack. Immediately above the user stack
- * resides the user structure, which is UPAGES long and contains the
- * kernel stack.
- *
- * Immediately after the user structure is the page table map, and then
- * kernal address space.
- */
- #define USRTEXT 0
- #define USRSTACK 0xFDBFE000
- #define BTOPUSRSTACK (0xFDC00-(UPAGES)) /* btop(USRSTACK) */
- #define LOWPAGES 0
- #define HIGHPAGES UPAGES
-
- /*
- * Virtual memory related constants, all in bytes
- */
- #define MAXTSIZ (6*1024*1024) /* max text size */
- #ifndef DFLDSIZ
- #define DFLDSIZ (6*1024*1024) /* initial data size limit */
- #endif
- #ifndef MAXDSIZ
- #define MAXDSIZ (32*1024*1024) /* max data size */
- #endif
- #ifndef DFLSSIZ
- #define DFLSSIZ (512*1024) /* initial stack size limit */
- #endif
- #ifndef MAXSSIZ
- #define MAXSSIZ MAXDSIZ /* max stack size */
- #endif
-
- /*
- * Default sizes of swap allocation chunks (see dmap.h).
- * The actual values may be changed in vminit() based on MAXDSIZ.
- * With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
- */
- #define DMMIN 32 /* smallest swap allocation */
- #define DMMAX 4096 /* largest potential swap allocation */
- #define DMTEXT 1024 /* swap allocation for text */
-
- /*
- * Sizes of the system and user portions of the system page table.
- */
- #define SYSPTSIZE (2*NPTEPG)
- #define USRPTSIZE (2*NPTEPG)
-
- /*
- * Size of User Raw I/O map
- */
- #define USRIOSIZE 300
-
- /*
- * The size of the clock loop.
- */
- #define LOOPPAGES (maxfree - firstfree)
-
- /*
- * The time for a process to be blocked before being very swappable.
- * This is a number of seconds which the system takes as being a non-trivial
- * amount of real time. You probably shouldn't change this;
- * it is used in subtle ways (fractions and multiples of it are, that is, like
- * half of a ``long time'', almost a long time, etc.)
- * It is related to human patience and other factors which don't really
- * change over time.
- */
- #define MAXSLP 20
-
- /*
- * A swapped in process is given a small amount of core without being bothered
- * by the page replacement algorithm. Basically this says that if you are
- * swapped in you deserve some resources. We protect the last SAFERSS
- * pages against paging and will just swap you out rather than paging you.
- * Note that each process has at least UPAGES+CLSIZE pages which are not
- * paged anyways (this is currently 8+2=10 pages or 5k bytes), so this
- * number just means a swapped in process is given around 25k bytes.
- * Just for fun: current memory prices are 4600$ a megabyte on VAX (4/22/81),
- * so we loan each swapped in process memory worth 100$, or just admit
- * that we don't consider it worthwhile and swap it out to disk which costs
- * $30/mb or about $0.75.
- * { wfj 6/16/89: Retail AT memory expansion $800/megabyte, loan of $17
- * on disk costing $7/mb or $0.18 (in memory still 100:1 in cost!) }
- */
- #define SAFERSS 8 /* nominal ``small'' resident set size
- protected against replacement */
-
- /*
- * DISKRPM is used to estimate the number of paging i/o operations
- * which one can expect from a single disk controller.
- */
- #define DISKRPM 60
-
- /*
- * Klustering constants. Klustering is the gathering
- * of pages together for pagein/pageout, while clustering
- * is the treatment of hardware page size as though it were
- * larger than it really is.
- *
- * KLMAX gives maximum cluster size in CLSIZE page (cluster-page)
- * units. Note that KLMAX*CLSIZE must be <= DMMIN in dmap.h.
- */
-
- #define KLMAX (4/CLSIZE)
- #define KLSEQL (2/CLSIZE) /* in klust if vadvise(VA_SEQL) */
- #define KLIN (4/CLSIZE) /* default data/stack in klust */
- #define KLTXT (4/CLSIZE) /* default text in klust */
- #define KLOUT (4/CLSIZE)
-
- /*
- * KLSDIST is the advance or retard of the fifo reclaim for sequential
- * processes data space.
- */
- #define KLSDIST 3 /* klusters advance/retard for seq. fifo */
-
- /*
- * Paging thresholds (see vm_sched.c).
- * Strategy of 1/19/85:
- * lotsfree is 512k bytes, but at most 1/4 of memory
- * desfree is 200k bytes, but at most 1/8 of memory
- * minfree is 64k bytes, but at most 1/2 of desfree
- */
- #define LOTSFREE (512 * 1024)
- #define LOTSFREEFRACT 4
- #define DESFREE (200 * 1024)
- #define DESFREEFRACT 8
- #define MINFREE (64 * 1024)
- #define MINFREEFRACT 2
-
- /*
- * There are two clock hands, initially separated by HANDSPREAD bytes
- * (but at most all of user memory). The amount of time to reclaim
- * a page once the pageout process examines it increases with this
- * distance and decreases as the scan rate rises.
- */
- #define HANDSPREAD (2 * 1024 * 1024)
-
- /*
- * The number of times per second to recompute the desired paging rate
- * and poke the pagedaemon.
- */
- #define RATETOSCHEDPAGING 4
-
- /*
- * Believed threshold (in megabytes) for which interleaved
- * swapping area is desirable.
- */
- #define LOTSOFMEM 2
-
- #define mapin(pte, v, pfnum, prot) \
- {(*(int *)(pte) = ((pfnum)<<PGSHIFT) | (prot)) ; }
-
- /*
- * Mach derived constants
- */
-
- /* user/kernel map constants */
- #define VM_MIN_ADDRESS ((vm_offset_t)0)
- #define VM_MAXUSER_ADDRESS ((vm_offset_t)0xFDBFD000)
- #define UPT_MIN_ADDRESS ((vm_offset_t)0xFDC00000)
- #define UPT_MAX_ADDRESS ((vm_offset_t)0xFDFF7000)
- #define VM_MAX_ADDRESS UPT_MAX_ADDRESS
- #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t)0xFDFF7000)
- #define UPDT VM_MIN_KERNEL_ADDRESS
- #define KPT_MIN_ADDRESS ((vm_offset_t)0xFDFF8000)
- #define KPT_MAX_ADDRESS ((vm_offset_t)0xFDFFF000)
- #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t)0xFF7FF000)
-
- /* virtual sizes (bytes) for various kernel submaps */
- #define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
- #define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)
- #define VM_PHYS_SIZE (USRIOSIZE*CLBYTES)
-
- /* # of kernel PT pages (initial only, can grow dynamically) */
- #define VM_KERNEL_PT_PAGES ((vm_size_t)2) /* XXX: SYSPTSIZE */
-
- /* pcb base */
- #define pcbb(p) ((u_int)(p)->p_addr)
-
- /*
- * Flush MMU TLB
- */
-
- #ifndef I386_CR3PAT
- #define I386_CR3PAT 0x0
- #endif
-
- #ifdef notyet
- #define _cr3() ({u_long rtn; \
- asm (" movl %%cr3,%%eax; movl %%eax,%0 " \
- : "=g" (rtn) \
- : \
- : "ax"); \
- rtn; \
- })
-
- #define load_cr3(s) ({ u_long val; \
- val = (s) | I386_CR3PAT; \
- asm ("movl %0,%%eax; movl %%eax,%%cr3" \
- : \
- : "g" (val) \
- : "ax"); \
- })
-
- #define tlbflush() ({ u_long val; \
- val = u.u_pcb.pcb_ptd | I386_CR3PAT; \
- asm ("movl %0,%%eax; movl %%eax,%%cr3" \
- : \
- : "g" (val) \
- : "ax"); \
- })
- #endif
-