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0967373e1c
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.
238 lines
8 KiB
C
238 lines
8 KiB
C
/*
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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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* 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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* $Id: pmap.h,v 1.5 1993/11/07 17:43:02 wollman Exp $
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*/
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#ifndef _PMAP_MACHINE_
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#define _PMAP_MACHINE_ 1
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/*
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* 386 page table entry and page table directory
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* W.Jolitz, 8/89
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*/
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struct pde
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{
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unsigned int
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pd_v:1, /* valid bit */
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pd_prot:2, /* access control */
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pd_mbz1:2, /* reserved, must be zero */
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pd_u:1, /* hardware maintained 'used' bit */
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:1, /* not used */
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pd_mbz2:2, /* reserved, must be zero */
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:3, /* reserved for software */
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pd_pfnum:20; /* physical page frame number of pte's*/
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};
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#define PD_MASK 0xffc00000 /* page directory address bits */
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#define PT_MASK 0x003ff000 /* page table address bits */
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#define PD_SHIFT 22 /* page directory address shift */
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#define PG_SHIFT 12 /* page table address shift */
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struct pte
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{
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unsigned int
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pg_v:1, /* valid bit */
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pg_prot:2, /* access control */
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pg_mbz1:2, /* reserved, must be zero */
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pg_u:1, /* hardware maintained 'used' bit */
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pg_m:1, /* hardware maintained modified bit */
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pg_mbz2:2, /* reserved, must be zero */
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pg_w:1, /* software, wired down page */
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:1, /* software (unused) */
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pg_nc:1, /* 'uncacheable page' bit */
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pg_pfnum:20; /* physical page frame number */
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};
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#define PG_V 0x00000001
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#define PG_RO 0x00000000
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#define PG_RW 0x00000002
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#define PG_u 0x00000004
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#define PG_PROT 0x00000006 /* all protection bits . */
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#define PG_W 0x00000200
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#define PG_N 0x00000800 /* Non-cacheable */
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#define PG_M 0x00000040
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#define PG_U 0x00000020
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#define PG_FRAME 0xfffff000
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#define PG_NOACC 0
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#define PG_KR 0x00000000
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#define PG_KW 0x00000002
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#define PG_URKR 0x00000004
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#define PG_URKW 0x00000004
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#define PG_UW 0x00000006
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/* Garbage for current bastardized pager that assumes a hp300 */
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#define PG_NV 0
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#define PG_CI 0
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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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typedef struct pde pd_entry_t; /* page directory entry */
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typedef struct pte pt_entry_t; /* Mach page table entry */
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/*
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* NKPDE controls the virtual space of the kernel, what ever is left, minus
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* the alternate page table area is given to the user (NUPDE)
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*/
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#define NKPDE 7 /* number of kernel pde's */
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#define NUPDE (NPTEPG-NKPDE-1)/* number of user pde's */
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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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*/
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#define APTDPTDI (NPTEPG-1) /* alt ptd entry that points to APTD */
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#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
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#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
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#define KSTKPTDI (PTDPTDI-1) /* ptd entry for u./kernel&user stack */
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#define KSTKPTEOFF (NBPG/sizeof(struct pde)-UPAGES) /* pte entry for kernel stack */
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#define PDESIZE sizeof(struct pde) /* for assembly files */
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#define PTESIZE sizeof(struct pte) /* for assembly files */
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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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#ifdef KERNEL
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extern struct pte PTmap[], APTmap[], Upte;
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extern struct pde PTD[], APTD[], PTDpde, APTDpde, Upde;
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extern pt_entry_t *Sysmap;
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extern int IdlePTD; /* physical address of "Idle" state directory */
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#endif
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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 kvtopte(va) vtopte(va)
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#define ptetov(pt) (i386_ptob(pt - PTmap))
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#define vtophys(va) (i386_ptob(vtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET))
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#define ispt(va) ((va) >= UPT_MIN_ADDRESS && (va) <= KPT_MAX_ADDRESS)
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#define avtopte(va) (APTmap + i386_btop(va))
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#define ptetoav(pt) (i386_ptob(pt - APTmap))
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#define avtophys(va) (i386_ptob(avtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET))
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/*
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* macros to generate page directory/table indicies
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*/
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#define pdei(va) (((va)&PD_MASK)>>PD_SHIFT)
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#define ptei(va) (((va)&PT_MASK)>>PG_SHIFT)
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/*
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* Pmap stuff
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*/
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struct pmap {
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pd_entry_t *pm_pdir; /* KVA of page directory */
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boolean_t pm_pdchanged; /* pdir changed */
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short pm_dref; /* page directory ref count */
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short pm_count; /* pmap reference count */
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simple_lock_data_t pm_lock; /* lock on pmap */
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struct pmap_statistics pm_stats; /* pmap statistics */
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long pm_ptpages; /* more stats: PT pages */
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};
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typedef struct pmap *pmap_t;
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#ifdef KERNEL
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extern pmap_t kernel_pmap;
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#endif
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/*
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* Macros for speed
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*/
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#define PMAP_ACTIVATE(pmapp, pcbp) \
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if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) { \
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(pcbp)->pcb_cr3 = \
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pmap_extract(kernel_pmap, (pmapp)->pm_pdir); \
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if ((pmapp) == &curproc->p_vmspace->vm_pmap) \
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load_cr3((pcbp)->pcb_cr3); \
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(pmapp)->pm_pdchanged = FALSE; \
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}
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#define PMAP_DEACTIVATE(pmapp, pcbp)
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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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struct pv_entry *pv_next; /* next 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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int pv_flags; /* flags */
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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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#define PV_PTPAGE 0x02 /* entry maps a page table page */
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#ifdef KERNEL
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pv_entry_t pv_table; /* array of entries, one per page */
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#define pa_index(pa) atop(pa - vm_first_phys)
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#define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
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#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
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#endif /* KERNEL */
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#endif /* _PMAP_MACHINE_ */
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