621 lines
18 KiB
C
621 lines
18 KiB
C
/* $NetBSD: pmap_bootstrap.c,v 1.47 1998/08/12 02:36:38 scottr Exp $ */
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/*
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* Copyright (c) 1991, 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.
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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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* @(#)pmap_bootstrap.c 8.1 (Berkeley) 6/10/93
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/reboot.h>
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#include <vm/vm.h>
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#include <machine/pte.h>
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#include <mac68k/mac68k/clockreg.h>
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#include <machine/vmparam.h>
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#include <machine/cpu.h>
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#include <machine/pmap.h>
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#include <machine/autoconf.h>
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#include <ufs/mfs/mfs_extern.h>
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#include <mac68k/mac68k/macrom.h>
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#define PA2VA(v, t) (t)((u_int)(v) - firstpa)
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extern char *etext;
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extern int Sysptsize;
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extern char *extiobase, *proc0paddr;
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extern st_entry_t *Sysseg;
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extern pt_entry_t *Sysptmap, *Sysmap;
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extern int physmem;
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extern int avail_remaining, avail_range, avail_end;
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extern vm_offset_t avail_start, avail_next;
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extern vm_offset_t virtual_avail, virtual_end;
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extern vm_size_t mem_size;
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extern int protection_codes[];
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extern int zsinited;
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/*
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* These are used to map the RAM:
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*/
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int numranges; /* = 0 == don't use the ranges */
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u_long low[8];
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u_long high[8];
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u_long maxaddr; /* PA of the last physical page */
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int vidlen;
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#define VIDMAPSIZE btoc(vidlen)
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extern u_int32_t mac68k_vidphys;
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extern u_int32_t videoaddr;
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extern u_int32_t videorowbytes;
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extern u_int32_t videosize;
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static u_int32_t newvideoaddr;
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extern caddr_t ROMBase;
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/*
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* Special purpose kernel virtual addresses, used for mapping
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* physical pages for a variety of temporary or permanent purposes:
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*
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* CADDR1, CADDR2: pmap zero/copy operations
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* vmmap: /dev/mem, crash dumps, parity error checking
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* msgbufaddr: kernel message buffer
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*/
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caddr_t CADDR1, CADDR2, vmmap;
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extern caddr_t msgbufaddr;
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/*
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* Bootstrap the VM system.
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*
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* This is called with the MMU either on or off. If it's on, we assume
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* that it's mapped with the same PA <=> LA mapping that we eventually
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* want. The page sizes and the protections will be wrong, anyway.
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*
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* nextpa is the first address following the loaded kernel. On a IIsi
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* on 12 May 1996, that was 0xf9000 beyond firstpa.
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*/
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void
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pmap_bootstrap(nextpa, firstpa)
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vm_offset_t nextpa;
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vm_offset_t firstpa;
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{
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vm_offset_t kstpa, kptpa, vidpa, iiopa, rompa;
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vm_offset_t kptmpa, lkptpa, p0upa;
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u_int nptpages, kstsize;
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int i;
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st_entry_t protoste, *ste;
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pt_entry_t protopte, *pte, *epte;
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vidlen = m68k_round_page(((videosize >> 16) & 0xffff) * videorowbytes +
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(mac68k_vidphys & PGOFSET));
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/*
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* Calculate important physical addresses:
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*
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* kstpa kernel segment table 1 page (!040)
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* N pages (040)
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*
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* kptpa statically allocated
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* kernel PT pages Sysptsize+ pages
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*
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* vidpa internal video space for some machines
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* PT pages VIDMAPSIZE pages
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*
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* rompa ROM space
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* PT pages ROMMAPSIZE pages
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*
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* iiopa internal IO space
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* PT pages IIOMAPSIZE pages
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*
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* [ Sysptsize is the number of pages of PT, IIOMAPSIZE and
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* NBMAPSIZE are the number of PTEs, hence we need to round
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* the total to a page boundary with IO maps at the end. ]
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*
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* kptmpa kernel PT map 1 page
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*
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* lkptpa last kernel PT page 1 page
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*
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* p0upa proc 0 u-area UPAGES pages
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*
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*/
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if (mmutype == MMU_68040)
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kstsize = MAXKL2SIZE / (NPTEPG/SG4_LEV2SIZE);
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else
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kstsize = 1;
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kstpa = nextpa;
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nextpa += kstsize * NBPG;
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kptpa = nextpa;
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nptpages = Sysptsize +
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(IIOMAPSIZE + ROMMAPSIZE + VIDMAPSIZE + NPTEPG - 1) / NPTEPG;
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nextpa += nptpages * NBPG;
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vidpa = nextpa - VIDMAPSIZE * sizeof(pt_entry_t);
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rompa = vidpa - ROMMAPSIZE * sizeof(pt_entry_t);
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iiopa = rompa - IIOMAPSIZE * sizeof(pt_entry_t);
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kptmpa = nextpa;
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nextpa += NBPG;
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lkptpa = nextpa;
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nextpa += NBPG;
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p0upa = nextpa;
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nextpa += USPACE;
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#if 0
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if (nextpa > high[0]) {
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printf("Failure in NetBSD boot; nextpa=0x%lx, high[0]=0x%lx.\n",
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nextpa, high[0]);
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printf("You're hosed! Try booting with 32-bit addressing ");
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printf("enabled in the memory control panel.\n");
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printf("Older machines may need Mode32 to get that option.\n");
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panic("Cannot work with the current memory mappings.\n");
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}
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#endif
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/*
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* Initialize segment table and kernel page table map.
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*
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* On 68030s and earlier MMUs the two are identical except for
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* the valid bits so both are initialized with essentially the
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* same values. On the 68040, which has a mandatory 3-level
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* structure, the segment table holds the level 1 table and part
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* (or all) of the level 2 table and hence is considerably
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* different. Here the first level consists of 128 descriptors
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* (512 bytes) each mapping 32mb of address space. Each of these
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* points to blocks of 128 second level descriptors (512 bytes)
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* each mapping 256kb. Note that there may be additional "segment
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* table" pages depending on how large MAXKL2SIZE is.
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*
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* XXX cramming two levels of mapping into the single "segment"
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* table on the 68040 is intended as a temporary hack to get things
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* working. The 224mb of address space that this allows will most
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* likely be insufficient in the future (at least for the kernel).
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*/
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if (mmutype == MMU_68040) {
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int num;
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/*
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* First invalidate the entire "segment table" pages
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* (levels 1 and 2 have the same "invalid" value).
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*/
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pte = PA2VA(kstpa, u_int *);
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epte = &pte[kstsize * NPTEPG];
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while (pte < epte)
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*pte++ = SG_NV;
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/*
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* Initialize level 2 descriptors (which immediately
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* follow the level 1 table). We need:
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* NPTEPG / SG4_LEV3SIZE
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* level 2 descriptors to map each of the nptpages+1
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* pages of PTEs. Note that we set the "used" bit
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* now to save the HW the expense of doing it.
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*/
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num = (nptpages + 1) * (NPTEPG / SG4_LEV3SIZE);
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pte = &(PA2VA(kstpa, u_int *))[SG4_LEV1SIZE];
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epte = &pte[num];
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protoste = kptpa | SG_U | SG_RW | SG_V;
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while (pte < epte) {
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*pte++ = protoste;
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protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
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}
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/*
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* Initialize level 1 descriptors. We need:
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* roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE
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* level 1 descriptors to map the `num' level 2's.
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*/
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pte = PA2VA(kstpa, u_int *);
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epte = &pte[roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE];
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protoste = (u_int)&pte[SG4_LEV1SIZE] | SG_U | SG_RW | SG_V;
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while (pte < epte) {
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*pte++ = protoste;
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protoste += (SG4_LEV2SIZE * sizeof(st_entry_t));
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}
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/*
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* Initialize the final level 1 descriptor to map the last
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* block of level 2 descriptors.
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*/
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ste = &(PA2VA(kstpa, u_int*))[SG4_LEV1SIZE-1];
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pte = &(PA2VA(kstpa, u_int*))[kstsize*NPTEPG - SG4_LEV2SIZE];
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*ste = (u_int)pte | SG_U | SG_RW | SG_V;
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/*
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* Now initialize the final portion of that block of
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* descriptors to map the "last PT page".
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*/
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pte = &(PA2VA(kstpa, u_int*))
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[kstsize*NPTEPG - NPTEPG/SG4_LEV3SIZE];
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epte = &pte[NPTEPG/SG4_LEV3SIZE];
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protoste = lkptpa | SG_U | SG_RW | SG_V;
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while (pte < epte) {
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*pte++ = protoste;
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protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
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}
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/*
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* Initialize Sysptmap
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*/
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pte = PA2VA(kptmpa, u_int *);
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epte = &pte[nptpages+1];
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protopte = kptpa | PG_RW | PG_CI | PG_V;
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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/*
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* Invalidate all but the last remaining entries in both.
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*/
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epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-1];
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while (pte < epte) {
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*pte++ = PG_NV;
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}
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/*
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* Initialize the last to point to the page
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* table page allocated earlier.
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*/
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*pte = lkptpa | PG_RW | PG_CI | PG_V;
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} else {
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/*
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* Map the page table pages in both the HW segment table
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* and the software Sysptmap. Note that Sysptmap is also
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* considered a PT page hence the +1.
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*/
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ste = PA2VA(kstpa, u_int*);
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pte = PA2VA(kptmpa, u_int*);
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epte = &pte[nptpages+1];
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protoste = kptpa | SG_RW | SG_V;
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protopte = kptpa | PG_RW | PG_CI | PG_V;
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while (pte < epte) {
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*ste++ = protoste;
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*pte++ = protopte;
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protoste += NBPG;
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protopte += NBPG;
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}
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/*
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* Invalidate all but the last remaining entries in both.
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*/
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epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-1];
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while (pte < epte) {
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*ste++ = SG_NV;
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*pte++ = PG_NV;
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}
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/*
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* Initialize the last to point to point to the page
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* table page allocated earlier.
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*/
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*ste = lkptpa | SG_RW | SG_V;
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*pte = lkptpa | PG_RW | PG_CI | PG_V;
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}
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/*
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* Invalidate all entries in the last kernel PT page
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* (u-area PTEs will be validated later).
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*/
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pte = PA2VA(lkptpa, u_int *);
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epte = &pte[NPTEPG];
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while (pte < epte)
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*pte++ = PG_NV;
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/*
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* Initialize kernel page table.
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* Start by invalidating the `nptpages' that we have allocated.
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*/
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pte = PA2VA(kptpa, u_int *);
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epte = &pte[nptpages * NPTEPG];
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while (pte < epte)
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*pte++ = PG_NV;
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/*
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* Validate PTEs for kernel text (RO)
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*/
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pte = &(PA2VA(kptpa, u_int *))[m68k_btop(KERNBASE)];
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epte = &pte[m68k_btop(m68k_trunc_page(&etext))];
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#if defined(KGDB) || defined(DDB)
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protopte = firstpa | PG_RW | PG_V; /* XXX RW for now */
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#else
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protopte = firstpa | PG_RO | PG_V;
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#endif
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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/*
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* Validate PTEs for kernel data/bss, dynamic data allocated
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* by us so far (nextpa - firstpa bytes), and pages for proc0
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* u-area and page table allocated below (RW).
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*/
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epte = &(PA2VA(kptpa, u_int *))[m68k_btop(nextpa - firstpa)];
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protopte = (protopte & ~PG_PROT) | PG_RW;
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/*
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* Enable copy-back caching of data pages
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*/
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if (mmutype == MMU_68040)
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protopte |= PG_CCB;
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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/*
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* Finally, validate the internal IO space, ROM space, and
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* framebuffer PTEs (RW+CI).
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*/
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pte = PA2VA(iiopa, u_int *);
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epte = PA2VA(rompa, u_int *);
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protopte = IOBase | PG_RW | PG_CI | PG_V;
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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pte = PA2VA(rompa, u_int *);
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epte = PA2VA(vidpa, u_int *);
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protopte = ((u_int) ROMBase) | PG_RO | PG_V;
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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if (vidlen) {
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pte = PA2VA(vidpa, u_int *);
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epte = pte + VIDMAPSIZE;
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protopte = (mac68k_vidphys & ~PGOFSET) | PG_RW | PG_V | PG_CI;
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while (pte < epte) {
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*pte++ = protopte;
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protopte += NBPG;
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}
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}
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/*
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* Calculate important exported kernel virtual addresses
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*/
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/*
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* Sysseg: base of kernel segment table
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*/
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Sysseg = PA2VA(kstpa, st_entry_t *);
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/*
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* Sysptmap: base of kernel page table map
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*/
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Sysptmap = PA2VA(kptmpa, pt_entry_t *);
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/*
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* Sysmap: kernel page table (as mapped through Sysptmap)
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* Immediately follows `nptpages' of static kernel page table.
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*/
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Sysmap = (pt_entry_t *)m68k_ptob(nptpages * NPTEPG);
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IOBase = (u_long)m68k_ptob(nptpages * NPTEPG -
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(IIOMAPSIZE + ROMMAPSIZE + VIDMAPSIZE));
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ROMBase = (char *)m68k_ptob(nptpages * NPTEPG -
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(ROMMAPSIZE + VIDMAPSIZE));
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if (vidlen) {
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newvideoaddr = (u_int32_t)m68k_ptob(nptpages * NPTEPG -
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VIDMAPSIZE) + (mac68k_vidphys & PGOFSET);
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}
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/*
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* Setup u-area for process 0.
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*/
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/*
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* Zero the u-area.
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* NOTE: `pte' and `epte' aren't PTEs here.
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*/
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pte = PA2VA(p0upa, u_int *);
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epte = (u_int *)(PA2VA(p0upa, u_int) + USPACE);
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while (pte < epte)
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*pte++ = 0;
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/*
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* Remember the u-area address so it can be loaded in the
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* proc struct p_addr field later.
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*/
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proc0paddr = PA2VA(p0upa, char *);
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/*
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* VM data structures are now initialized, set up data for
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* the pmap module.
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*
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* Note about avail_end: msgbuf is initialized just after
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* avail_end in machdep.c. Since the last page is used
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* for rebooting the system (code is copied there and
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* excution continues from copied code before the MMU
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* is disabled), the msgbuf will get trounced between
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* reboots if it's placed in the last physical page.
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* To work around this, we move avail_end back one more
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* page so the msgbuf can be preserved.
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*/
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avail_next = avail_start = m68k_round_page(nextpa);
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avail_remaining = 0;
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avail_range = -1;
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for (i = 0; i < numranges; i++) {
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if (low[i] <= avail_next && avail_next < high[i]) {
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avail_range = i;
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avail_remaining = high[i] - avail_next;
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} else if (avail_range != -1) {
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avail_remaining += (high[i] - low[i]);
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}
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}
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physmem = m68k_btop(avail_remaining + nextpa - firstpa);
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maxaddr = high[numranges - 1] - m68k_ptob(1);
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high[numranges - 1] -= (m68k_round_page(MSGBUFSIZE) + m68k_ptob(1));
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avail_remaining -= (m68k_round_page(MSGBUFSIZE) + m68k_ptob(1));
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avail_end = high[numranges - 1];
|
|
avail_remaining = m68k_btop(m68k_trunc_page(avail_remaining));
|
|
|
|
mem_size = m68k_ptob(physmem);
|
|
virtual_avail = VM_MIN_KERNEL_ADDRESS + (nextpa - firstpa);
|
|
virtual_end = VM_MAX_KERNEL_ADDRESS;
|
|
|
|
/*
|
|
* Initialize protection array.
|
|
* XXX don't use a switch statement, it might produce an
|
|
* absolute "jmp" table.
|
|
*/
|
|
{
|
|
int *kp;
|
|
|
|
kp = (int *) &protection_codes;
|
|
kp[VM_PROT_NONE|VM_PROT_NONE|VM_PROT_NONE] = 0;
|
|
kp[VM_PROT_READ|VM_PROT_NONE|VM_PROT_NONE] = PG_RO;
|
|
kp[VM_PROT_READ|VM_PROT_NONE|VM_PROT_EXECUTE] = PG_RO;
|
|
kp[VM_PROT_NONE|VM_PROT_NONE|VM_PROT_EXECUTE] = PG_RO;
|
|
kp[VM_PROT_NONE|VM_PROT_WRITE|VM_PROT_NONE] = PG_RW;
|
|
kp[VM_PROT_NONE|VM_PROT_WRITE|VM_PROT_EXECUTE] = PG_RW;
|
|
kp[VM_PROT_READ|VM_PROT_WRITE|VM_PROT_NONE] = PG_RW;
|
|
kp[VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE] = PG_RW;
|
|
}
|
|
|
|
/*
|
|
* Kernel page/segment table allocated in locore,
|
|
* just initialize pointers.
|
|
*/
|
|
{
|
|
struct pmap *kpm = (struct pmap *)&kernel_pmap_store;
|
|
|
|
kpm->pm_stab = Sysseg;
|
|
kpm->pm_ptab = Sysmap;
|
|
simple_lock_init(&kpm->pm_lock);
|
|
kpm->pm_count = 1;
|
|
kpm->pm_stpa = (st_entry_t *)kstpa;
|
|
/*
|
|
* For the 040 we also initialize the free level 2
|
|
* descriptor mask noting that we have used:
|
|
* 0: level 1 table
|
|
* 1 to `num': map page tables
|
|
* MAXKL2SIZE-1: maps last-page page table
|
|
*/
|
|
if (mmutype == MMU_68040) {
|
|
int num;
|
|
|
|
kpm->pm_stfree = ~l2tobm(0);
|
|
num = roundup((nptpages + 1) * (NPTEPG / SG4_LEV3SIZE),
|
|
SG4_LEV2SIZE) / SG4_LEV2SIZE;
|
|
while (num)
|
|
kpm->pm_stfree &= ~l2tobm(num--);
|
|
kpm->pm_stfree &= ~l2tobm(MAXKL2SIZE-1);
|
|
for (num = MAXKL2SIZE;
|
|
num < sizeof(kpm->pm_stfree)*NBBY;
|
|
num++)
|
|
kpm->pm_stfree &= ~l2tobm(num);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate some fixed, special purpose kernel virtual addresses
|
|
*/
|
|
{
|
|
vm_offset_t va = virtual_avail;
|
|
|
|
CADDR1 = (caddr_t)va;
|
|
va += NBPG;
|
|
CADDR2 = (caddr_t)va;
|
|
va += NBPG;
|
|
vmmap = (caddr_t)va;
|
|
va += NBPG;
|
|
msgbufaddr = (caddr_t)va;
|
|
va += m68k_round_page(MSGBUFSIZE);
|
|
virtual_avail = va;
|
|
}
|
|
}
|
|
|
|
void
|
|
bootstrap_mac68k(tc)
|
|
int tc;
|
|
{
|
|
extern void zs_init __P((void));
|
|
extern int *esym;
|
|
vm_offset_t nextpa;
|
|
caddr_t oldROMBase;
|
|
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Bootstrapping NetBSD/mac68k.\n");
|
|
|
|
oldROMBase = ROMBase;
|
|
mac68k_vidphys = videoaddr;
|
|
|
|
if (((tc & 0x80000000) && (mmutype == MMU_68030)) ||
|
|
((tc & 0x8000) && (mmutype == MMU_68040))) {
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Getting mapping from MMU.\n");
|
|
(void) get_mapping();
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Done.\n");
|
|
} else {
|
|
/* MMU not enabled. Fake up ranges. */
|
|
numranges = 1;
|
|
low[0] = 0;
|
|
high[0] = mac68k_machine.mach_memsize * (1024 * 1024);
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Faked range to byte 0x%lx.\n", high[0]);
|
|
}
|
|
nextpa = load_addr + m68k_round_page(esym);
|
|
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Bootstrapping the pmap system.\n");
|
|
|
|
pmap_bootstrap(nextpa, load_addr);
|
|
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Pmap bootstrapped.\n");
|
|
|
|
if (!vidlen)
|
|
panic("Don't know how to relocate video!\n");
|
|
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Moving ROMBase from %p to %p.\n", oldROMBase, ROMBase);
|
|
|
|
mrg_fixupROMBase(oldROMBase, ROMBase);
|
|
|
|
if (mac68k_machine.do_graybars)
|
|
printf("Video address 0x%lx -> 0x%lx.\n",
|
|
(unsigned long)videoaddr, (unsigned long)newvideoaddr);
|
|
|
|
mac68k_set_io_offsets(IOBase);
|
|
|
|
/*
|
|
* If the serial ports are going (for console or 'echo'), then
|
|
* we need to make sure the IO change gets propagated properly.
|
|
* This resets the base addresses for the 8530 (serial) driver.
|
|
*
|
|
* WARNING!!! No printfs() (etc) BETWEEN zs_init() and the end
|
|
* of this function (where we start using the MMU, so the new
|
|
* address is correct.
|
|
*/
|
|
if (zsinited != 0)
|
|
zs_init();
|
|
|
|
videoaddr = newvideoaddr;
|
|
}
|