1995-05-30 08:16:23 +00:00
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/*
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1993-06-12 14:58:17 +00:00
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* Copyright (c) 1991 Regents of the University of California.
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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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* the Systems Programming Group of the University of Utah Computer
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* Science Department and William Jolitz of UUNET Technologies Inc.
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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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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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1993-10-15 10:07:45 +00:00
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* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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1999-08-28 01:08:13 +00:00
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* $FreeBSD$
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1993-06-12 14:58:17 +00:00
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*/
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1994-11-14 14:12:24 +00:00
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#ifndef _MACHINE_PMAP_H_
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#define _MACHINE_PMAP_H_
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1993-06-12 14:58:17 +00:00
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1996-05-02 22:25:18 +00:00
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/*
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* Page-directory and page-table entires follow this format, with a few
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* of the fields not present here and there, depending on a lot of things.
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*/
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/* ---- Intel Nomenclature ---- */
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#define PG_V 0x001 /* P Valid */
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#define PG_RW 0x002 /* R/W Read/Write */
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#define PG_U 0x004 /* U/S User/Supervisor */
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#define PG_NC_PWT 0x008 /* PWT Write through */
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#define PG_NC_PCD 0x010 /* PCD Cache disable */
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#define PG_A 0x020 /* A Accessed */
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#define PG_M 0x040 /* D Dirty */
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#define PG_PS 0x080 /* PS Page size (0=4k,1=4M) */
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#define PG_G 0x100 /* G Global */
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#define PG_AVAIL1 0x200 /* / Available for system */
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#define PG_AVAIL2 0x400 /* < programmers use */
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#define PG_AVAIL3 0x800 /* \ */
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/* Our various interpretations of the above */
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#define PG_W PG_AVAIL1 /* "Wired" pseudoflag */
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1996-05-18 03:38:05 +00:00
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#define PG_MANAGED PG_AVAIL2
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1996-05-02 22:25:18 +00:00
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#define PG_FRAME (~PAGE_MASK)
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#define PG_PROT (PG_RW|PG_U) /* all protection bits . */
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#define PG_N (PG_NC_PWT|PG_NC_PCD) /* Non-cacheable */
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1993-06-12 14:58:17 +00:00
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1996-05-02 14:21:14 +00:00
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/*
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* Page Protection Exception bits
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*/
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#define PGEX_P 0x01 /* Protection violation vs. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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2001-09-21 06:23:03 +00:00
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/*
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* Size of Kernel address space. This is the number of page table pages
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* (4MB each) to use for the kernel. 256 pages == 1 Gigabyte.
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* This **MUST** be a multiple of 4 (eg: 252, 256, 260, etc).
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*/
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#ifndef KVA_PAGES
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#define KVA_PAGES 256
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#endif
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1996-05-02 14:21:14 +00:00
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/*
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* Pte related macros
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*/
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#define VADDR(pdi, pti) ((vm_offset_t)(((pdi)<<PDRSHIFT)|((pti)<<PAGE_SHIFT)))
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1993-06-12 14:58:17 +00:00
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1994-01-14 16:25:31 +00:00
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#ifndef NKPT
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2001-09-21 06:23:03 +00:00
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#define NKPT 30 /* actual number of kernel page tables */
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These changes embody the support of the fully coherent merged VM buffer cache,
much higher filesystem I/O performance, and much better paging performance. It
represents the culmination of over 6 months of R&D.
The majority of the merged VM/cache work is by John Dyson.
The following highlights the most significant changes. Additionally, there are
(mostly minor) changes to the various filesystem modules (nfs, msdosfs, etc) to
support the new VM/buffer scheme.
vfs_bio.c:
Significant rewrite of most of vfs_bio to support the merged VM buffer cache
scheme. The scheme is almost fully compatible with the old filesystem
interface. Significant improvement in the number of opportunities for write
clustering.
vfs_cluster.c, vfs_subr.c
Upgrade and performance enhancements in vfs layer code to support merged
VM/buffer cache. Fixup of vfs_cluster to eliminate the bogus pagemove stuff.
vm_object.c:
Yet more improvements in the collapse code. Elimination of some windows that
can cause list corruption.
vm_pageout.c:
Fixed it, it really works better now. Somehow in 2.0, some "enhancements"
broke the code. This code has been reworked from the ground-up.
vm_fault.c, vm_page.c, pmap.c, vm_object.c
Support for small-block filesystems with merged VM/buffer cache scheme.
pmap.c vm_map.c
Dynamic kernel VM size, now we dont have to pre-allocate excessive numbers of
kernel PTs.
vm_glue.c
Much simpler and more effective swapping code. No more gratuitous swapping.
proc.h
Fixed the problem that the p_lock flag was not being cleared on a fork.
swap_pager.c, vnode_pager.c
Removal of old vfs_bio cruft to support the past pseudo-coherency. Now the
code doesn't need it anymore.
machdep.c
Changes to better support the parameter values for the merged VM/buffer cache
scheme.
machdep.c, kern_exec.c, vm_glue.c
Implemented a seperate submap for temporary exec string space and another one
to contain process upages. This eliminates all map fragmentation problems
that previously existed.
ffs_inode.c, ufs_inode.c, ufs_readwrite.c
Changes for merged VM/buffer cache. Add "bypass" support for sneaking in on
busy buffers.
Submitted by: John Dyson and David Greenman
1995-01-09 16:06:02 +00:00
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#endif
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1994-01-14 16:25:31 +00:00
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#ifndef NKPDE
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1997-06-22 16:04:22 +00:00
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#ifdef SMP
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2001-09-21 06:23:03 +00:00
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#define NKPDE (KVA_PAGES - 2) /* addressable number of page tables/pde's */
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1997-06-22 16:04:22 +00:00
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#else
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2001-09-21 06:23:03 +00:00
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#define NKPDE (KVA_PAGES - 1) /* addressable number of page tables/pde's */
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#endif
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1994-01-14 16:25:31 +00:00
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#endif
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1993-10-12 13:58:01 +00:00
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/*
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* The *PTDI values control the layout of virtual memory
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*
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* XXX This works for now, but I am not real happy with it, I'll fix it
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* right after I fix locore.s and the magic 28K hole
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1997-04-26 11:46:25 +00:00
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*
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* SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
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1993-10-12 13:58:01 +00:00
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*/
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1996-05-02 14:21:14 +00:00
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#define APTDPTDI (NPDEPG-1) /* alt ptd entry that points to APTD */
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1997-06-22 16:04:22 +00:00
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#ifdef SMP
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1997-04-26 11:46:25 +00:00
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#define MPPTDI (APTDPTDI-1) /* per cpu ptd entry */
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#define KPTDI (MPPTDI-NKPDE) /* start of kernel virtual pde's */
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1997-06-22 16:04:22 +00:00
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#else
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1993-10-15 10:07:45 +00:00
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#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
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1997-06-22 16:04:22 +00:00
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#endif /* SMP */
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1993-10-12 15:09:37 +00:00
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#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
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1997-04-07 09:30:22 +00:00
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#define UMAXPTDI (PTDPTDI-1) /* ptd entry for user space end */
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1999-12-11 10:54:06 +00:00
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#define UMAXPTEOFF (NPTEPG) /* pte entry for user space end */
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First steps in rewriting locore.s, and making info useful
when the machine panics.
i386/i386/locore.s:
1) got rid of most .set directives that were being used like
#define's, and replaced them with appropriate #define's in
the appropriate header files (accessed via genassym).
2) added comments to header inclusions and global definitions,
and global variables
3) replaced some hardcoded constants with cpp defines (such as
PDESIZE and others)
4) aligned all comments to the same column to make them easier to
read
5) moved macro definitions for ENTRY, ALIGN, NOP, etc. to
/sys/i386/include/asmacros.h
6) added #ifdef BDE_DEBUGGER around all of Bruce's debugger code
7) added new global '_KERNend' to store last location+1 of kernel
8) cleaned up zeroing of bss so that only bss is zeroed
9) fix zeroing of page tables so that it really does zero them all
- not just if they follow the bss.
10) rewrote page table initialization code so that 1) works correctly
and 2) write protects the kernel text by default
11) properly initialize the kernel page directory, upages, p0stack PT,
and page tables. The previous scheme was more than a bit
screwy.
12) change allocation of virtual area of IO hole so that it is
fixed at KERNBASE + 0xa0000. The previous scheme put it
right after the kernel page tables and then later expected
it to be at KERNBASE +0xa0000
13) change multiple bogus settings of user read/write of various
areas of kernel VM - including the IO hole; we should never
be accessing the IO hole in user mode through the kernel
page tables
14) split kernel support routines such as bcopy, bzero, copyin,
copyout, etc. into a seperate file 'support.s'
15) split swtch and related routines into a seperate 'swtch.s'
16) split routines related to traps, syscalls, and interrupts
into a seperate file 'exception.s'
17) remove some unused global variables from locore that got
inserted by Garrett when he pulled them out of some .h
files.
i386/isa/icu.s:
1) clean up global variable declarations
2) move in declaration of astpending and netisr
i386/i386/pmap.c:
1) fix calculation of virtual_avail. It previously was calculated
to be right in the middle of the kernel page tables - not
a good place to start allocating kernel VM.
2) properly allocate kernel page dir/tables etc out of kernel map
- previously only took out 2 pages.
i386/i386/machdep.c:
1) modify boot() to print a warning that the system will reboot in
PANIC_REBOOT_WAIT_TIME amount of seconds, and let the user
abort with a key on the console. The machine will wait for
ever if a key is typed before the reboot. The default is
15 seconds, but can be set to 0 to mean don't wait at all,
-1 to mean wait forever, or any positive value to wait for
that many seconds.
2) print "Rebooting..." just before doing it.
kern/subr_prf.c:
1) remove PANICWAIT as it is deprecated by the change to machdep.c
i386/i386/trap.c:
1) add table of trap type strings and use it to print a real trap/
panic message rather than just a number. Lot's of work to
be done here, but this is the first step. Symbolic traceback
is in the TODO.
i386/i386/Makefile.i386:
1) add support in to build support.s, exception.s and swtch.s
...and various changes to various header files to make all of the
above happen.
1993-11-13 02:25:21 +00:00
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1996-05-02 22:25:18 +00:00
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/*
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* XXX doesn't really belong here I guess...
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*/
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#define ISA_HOLE_START 0xa0000
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#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
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1996-05-02 14:21:14 +00:00
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#ifndef LOCORE
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1996-09-08 16:57:53 +00:00
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#include <sys/queue.h>
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2001-11-17 01:38:32 +00:00
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typedef u_int32_t pd_entry_t;
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typedef u_int32_t pt_entry_t;
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1996-05-02 14:21:14 +00:00
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2003-02-23 09:45:50 +00:00
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#define PTESHIFT (2)
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#define PDESHIFT (2)
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1993-06-12 14:58:17 +00:00
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/*
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* Address of current and alternate address space page table maps
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* and directories.
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*/
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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2001-11-17 01:38:32 +00:00
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extern pt_entry_t PTmap[], APTmap[];
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extern pd_entry_t PTD[], APTD[];
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extern pd_entry_t PTDpde, APTDpde;
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1993-06-12 14:58:17 +00:00
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2002-07-12 07:56:11 +00:00
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extern pd_entry_t *IdlePTD; /* physical address of "Idle" state directory */
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1993-06-12 14:58:17 +00:00
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#endif
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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1993-06-12 14:58:17 +00:00
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/*
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* virtual address to page table entry and
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* to physical address. Likewise for alternate address space.
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* Note: these work recursively, thus vtopte of a pte will give
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* the corresponding pde that in turn maps it.
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*/
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#define vtopte(va) (PTmap + i386_btop(va))
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#define avtopte(va) (APTmap + i386_btop(va))
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1994-03-24 23:12:48 +00:00
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/*
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* Routine: pmap_kextract
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* Function:
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* Extract the physical page address associated
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* kernel virtual address.
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*/
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1994-11-14 14:12:24 +00:00
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static __inline vm_offset_t
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pmap_kextract(vm_offset_t va)
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1994-03-24 23:12:48 +00:00
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{
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1997-07-17 04:34:03 +00:00
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vm_offset_t pa;
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if ((pa = (vm_offset_t) PTD[va >> PDRSHIFT]) & PG_PS) {
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pa = (pa & ~(NBPDR - 1)) | (va & (NBPDR - 1));
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} else {
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pa = *(vm_offset_t *)vtopte(va);
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pa = (pa & PG_FRAME) | (va & PAGE_MASK);
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}
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1994-03-24 23:12:48 +00:00
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return pa;
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}
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1997-07-17 04:34:03 +00:00
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#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
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#endif
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1993-06-12 14:58:17 +00:00
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/*
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* Pmap stuff
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*/
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1996-09-08 16:57:53 +00:00
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struct pv_entry;
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2000-05-21 12:50:18 +00:00
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struct md_page {
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1996-09-08 16:57:53 +00:00
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int pv_list_count;
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2000-05-26 02:09:24 +00:00
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TAILQ_HEAD(,pv_entry) pv_list;
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2000-05-21 12:50:18 +00:00
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};
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1993-06-12 14:58:17 +00:00
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struct pmap {
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pd_entry_t *pm_pdir; /* KVA of page directory */
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1996-05-18 03:38:05 +00:00
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vm_object_t pm_pteobj; /* Container for pte's */
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2000-05-26 02:09:24 +00:00
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TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
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1999-04-02 17:59:49 +00:00
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int pm_active; /* active on cpus */
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1993-06-12 14:58:17 +00:00
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struct pmap_statistics pm_stats; /* pmap statistics */
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2000-08-16 21:24:44 +00:00
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LIST_ENTRY(pmap) pm_list; /* List of all pmaps */
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1993-06-12 14:58:17 +00:00
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};
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2002-08-05 03:40:28 +00:00
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#define pmap_page_is_mapped(m) (!TAILQ_EMPTY(&(m)->md.pv_list))
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1996-10-13 03:14:57 +00:00
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#define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
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1993-06-12 14:58:17 +00:00
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typedef struct pmap *pmap_t;
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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2002-04-29 07:43:16 +00:00
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extern struct pmap kernel_pmap_store;
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#define kernel_pmap (&kernel_pmap_store)
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1993-06-12 14:58:17 +00:00
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#endif
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/*
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* For each vm_page_t, there is a list of all currently valid virtual
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* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
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*/
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typedef struct pv_entry {
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pmap_t pv_pmap; /* pmap where mapping lies */
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vm_offset_t pv_va; /* virtual address for mapping */
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2000-05-26 02:09:24 +00:00
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TAILQ_ENTRY(pv_entry) pv_list;
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TAILQ_ENTRY(pv_entry) pv_plist;
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1996-02-25 03:02:53 +00:00
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vm_page_t pv_ptem; /* VM page for pte */
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1993-06-12 14:58:17 +00:00
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} *pv_entry_t;
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#define PV_ENTRY_NULL ((pv_entry_t) 0)
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#define PV_CI 0x01 /* all entries must be cache inhibited */
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1993-10-12 13:58:01 +00:00
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#define PV_PTPAGE 0x02 /* entry maps a page table page */
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1993-06-12 14:58:17 +00:00
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1999-12-29 04:46:21 +00:00
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#ifdef _KERNEL
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1993-06-12 14:58:17 +00:00
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1998-05-11 01:06:08 +00:00
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#define NPPROVMTRR 8
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#define PPRO_VMTRRphysBase0 0x200
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#define PPRO_VMTRRphysMask0 0x201
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1998-11-24 20:25:52 +00:00
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struct ppro_vmtrr {
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1998-05-11 01:06:08 +00:00
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u_int64_t base, mask;
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1998-11-24 20:25:52 +00:00
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};
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extern struct ppro_vmtrr PPro_vmtrr[NPPROVMTRR];
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1998-05-11 01:06:08 +00:00
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1995-03-16 18:17:34 +00:00
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extern caddr_t CADDR1;
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extern pt_entry_t *CMAP1;
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extern vm_offset_t avail_end;
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extern vm_offset_t avail_start;
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1997-11-20 19:30:35 +00:00
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extern vm_offset_t clean_eva;
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extern vm_offset_t clean_sva;
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1995-07-19 06:37:12 +00:00
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extern vm_offset_t phys_avail[];
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1997-11-20 19:30:35 +00:00
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extern char *ptvmmap; /* poor name! */
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1995-03-16 18:17:34 +00:00
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extern vm_offset_t virtual_avail;
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extern vm_offset_t virtual_end;
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1993-06-12 14:58:17 +00:00
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2002-07-12 07:56:11 +00:00
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void pmap_bootstrap(vm_offset_t, vm_offset_t);
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2002-03-20 05:48:58 +00:00
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void *pmap_mapdev(vm_offset_t, vm_size_t);
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void pmap_unmapdev(vm_offset_t, vm_size_t);
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pt_entry_t *pmap_pte(pmap_t, vm_offset_t) __pure2;
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vm_page_t pmap_use_pt(pmap_t, vm_offset_t);
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void pmap_set_opt(void);
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2002-07-12 07:56:11 +00:00
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void pmap_invalidate_page(pmap_t, vm_offset_t);
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void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
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void pmap_invalidate_all(pmap_t);
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1993-12-19 00:55:01 +00:00
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1999-12-29 04:46:21 +00:00
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#endif /* _KERNEL */
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1996-10-12 20:36:15 +00:00
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1996-05-02 14:21:14 +00:00
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#endif /* !LOCORE */
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1993-06-12 14:58:17 +00:00
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1994-11-14 14:12:24 +00:00
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#endif /* !_MACHINE_PMAP_H_ */
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