NetBSD-5.0.2/sys/arch/mac68k/mac68k/pmap_bootstrap.c
/* $NetBSD: pmap_bootstrap.c,v 1.74 2007/10/17 19:55:15 garbled Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)pmap_bootstrap.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.74 2007/10/17 19:55:15 garbled Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "zsc.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <uvm/uvm_extern.h>
#include <machine/pte.h>
#include <machine/vmparam.h>
#include <machine/cpu.h>
#include <machine/pmap.h>
#include <machine/autoconf.h>
#include <machine/video.h>
#include <mac68k/mac68k/macrom.h>
#define PA2VA(v, t) (t)((u_int)(v) - firstpa)
extern char *etext;
extern int Sysptsize;
extern char *extiobase, *proc0paddr;
extern st_entry_t *Sysseg;
extern pt_entry_t *Sysptmap, *Sysmap;
extern int physmem;
extern paddr_t avail_start;
extern paddr_t avail_end;
extern vaddr_t virtual_avail, virtual_end;
extern vsize_t mem_size;
extern int protection_codes[];
#if NZSC > 0
extern int zsinited;
#endif
/*
* These are used to map the RAM:
*/
int numranges; /* = 0 == don't use the ranges */
u_long low[8];
u_long high[8];
u_long maxaddr; /* PA of the last physical page */
int vidlen;
#define VIDMAPSIZE btoc(vidlen)
static vaddr_t newvideoaddr;
extern void * ROMBase;
/*
* Special purpose kernel virtual addresses, used for mapping
* physical pages for a variety of temporary or permanent purposes:
*
* CADDR1, CADDR2: pmap zero/copy operations
* vmmap: /dev/mem, crash dumps, parity error checking
* msgbufaddr: kernel message buffer
*/
void *CADDR1, *CADDR2;
char *vmmap;
void *msgbufaddr;
void pmap_bootstrap(paddr_t, paddr_t);
void bootstrap_mac68k(int);
/*
* Bootstrap the VM system.
*
* This is called with the MMU either on or off. If it's on, we assume
* that it's mapped with the same PA <=> LA mapping that we eventually
* want. The page sizes and the protections will be wrong, anyway.
*
* nextpa is the first address following the loaded kernel. On a IIsi
* on 12 May 1996, that was 0xf9000 beyond firstpa.
*/
void
pmap_bootstrap(paddr_t nextpa, paddr_t firstpa)
{
paddr_t kstpa, kptpa, kptmpa, lkptpa, p0upa;
u_int nptpages, kstsize;
paddr_t avail_next;
int avail_remaining;
int avail_range;
int i;
st_entry_t protoste, *ste;
pt_entry_t protopte, *pte, *epte;
extern char start[];
vidlen = m68k_round_page(mac68k_video.mv_height *
mac68k_video.mv_stride + m68k_page_offset(mac68k_video.mv_phys));
/*
* Calculate important physical addresses:
*
* kstpa kernel segment table 1 page (!040)
* N pages (040)
*
* kptpa statically allocated
* kernel PT pages Sysptsize+ pages
*
* [ Sysptsize is the number of pages of PT, IIOMAPSIZE and
* NBMAPSIZE are the number of PTEs, hence we need to round
* the total to a page boundary with IO maps at the end. ]
*
* kptmpa kernel PT map 1 page
*
* lkptpa last kernel PT page 1 page
*
* p0upa proc 0 u-area UPAGES pages
*
*/
if (mmutype == MMU_68040)
kstsize = MAXKL2SIZE / (NPTEPG/SG4_LEV2SIZE);
else
kstsize = 1;
kstpa = nextpa;
nextpa += kstsize * PAGE_SIZE;
kptmpa = nextpa;
nextpa += PAGE_SIZE;
lkptpa = nextpa;
nextpa += PAGE_SIZE;
p0upa = nextpa;
nextpa += USPACE;
kptpa = nextpa;
nptpages = Sysptsize +
(IIOMAPSIZE + ROMMAPSIZE + VIDMAPSIZE + NPTEPG - 1) / NPTEPG;
nextpa += nptpages * PAGE_SIZE;
for (i = 0; i < numranges; i++)
if (low[i] <= firstpa && firstpa < high[i])
break;
if (i >= numranges || nextpa > high[i]) {
if (mac68k_machine.do_graybars) {
printf("Failure in NetBSD boot; ");
if (i < numranges)
printf("nextpa=0x%lx, high[%d]=0x%lx.\n",
nextpa, i, high[i]);
else
printf("can't find kernel RAM segment.\n");
printf("You're hosed! Try booting with 32-bit ");
printf("addressing enabled in the memory control ");
printf("panel.\n");
printf("Older machines may need Mode32 to get that ");
printf("option.\n");
}
panic("Cannot work with the current memory mappings.");
}
/*
* Initialize segment table and kernel page table map.
*
* On 68030s and earlier MMUs the two are identical except for
* the valid bits so both are initialized with essentially the
* same values. On the 68040, which has a mandatory 3-level
* structure, the segment table holds the level 1 table and part
* (or all) of the level 2 table and hence is considerably
* different. Here the first level consists of 128 descriptors
* (512 bytes) each mapping 32mb of address space. Each of these
* points to blocks of 128 second level descriptors (512 bytes)
* each mapping 256kb. Note that there may be additional "segment
* table" pages depending on how large MAXKL2SIZE is.
*
* XXX cramming two levels of mapping into the single "segment"
* table on the 68040 is intended as a temporary hack to get things
* working. The 224mb of address space that this allows will most
* likely be insufficient in the future (at least for the kernel).
*/
if (mmutype == MMU_68040) {
int num;
/*
* First invalidate the entire "segment table" pages
* (levels 1 and 2 have the same "invalid" value).
*/
pte = PA2VA(kstpa, u_int *);
epte = &pte[kstsize * NPTEPG];
while (pte < epte)
*pte++ = SG_NV;
/*
* Initialize level 2 descriptors (which immediately
* follow the level 1 table). We need:
* NPTEPG / SG4_LEV3SIZE
* level 2 descriptors to map each of the nptpages
* pages of PTEs. Note that we set the "used" bit
* now to save the HW the expense of doing it.
*/
num = nptpages * (NPTEPG / SG4_LEV3SIZE);
pte = &(PA2VA(kstpa, u_int *))[SG4_LEV1SIZE];
epte = &pte[num];
protoste = kptpa | SG_U | SG_RW | SG_V;
while (pte < epte) {
*pte++ = protoste;
protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
}
/*
* Initialize level 1 descriptors. We need:
* roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE
* level 1 descriptors to map the `num' level 2's.
*/
pte = PA2VA(kstpa, u_int *);
epte = &pte[roundup(num, SG4_LEV2SIZE) / SG4_LEV2SIZE];
protoste = (u_int)&pte[SG4_LEV1SIZE] | SG_U | SG_RW | SG_V;
while (pte < epte) {
*pte++ = protoste;
protoste += (SG4_LEV2SIZE * sizeof(st_entry_t));
}
/*
* Initialize the final level 1 descriptor to map the last
* block of level 2 descriptors.
*/
ste = &(PA2VA(kstpa, u_int*))[SG4_LEV1SIZE-1];
pte = &(PA2VA(kstpa, u_int*))[kstsize*NPTEPG - SG4_LEV2SIZE];
*ste = (u_int)pte | SG_U | SG_RW | SG_V;
/*
* Now initialize the final portion of that block of
* descriptors to map kptmpa and the "last PT page".
*/
pte = &(PA2VA(kstpa, u_int*))
[kstsize*NPTEPG - NPTEPG/SG4_LEV3SIZE*2];
epte = &pte[NPTEPG/SG4_LEV3SIZE];
protoste = kptmpa | SG_U | SG_RW | SG_V;
while (pte < epte) {
*pte++ = protoste;
protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
}
epte = &pte[NPTEPG/SG4_LEV3SIZE];
protoste = lkptpa | SG_U | SG_RW | SG_V;
while (pte < epte) {
*pte++ = protoste;
protoste += (SG4_LEV3SIZE * sizeof(st_entry_t));
}
/*
* Initialize Sysptmap
*/
pte = PA2VA(kptmpa, u_int *);
epte = &pte[nptpages];
protopte = kptpa | PG_RW | PG_CI | PG_V;
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
/*
* Invalidate all but the last two remaining entries.
*/
epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-2];
while (pte < epte) {
*pte++ = PG_NV;
}
/*
* Initialize the last ones to point to Sysptmap and the page
* table page allocated earlier.
*/
*pte = kptmpa | PG_RW | PG_CI | PG_V;
pte++;
*pte = lkptpa | PG_RW | PG_CI | PG_V;
} else {
/*
* Map the page table pages in both the HW segment table
* and the software Sysptmap.
*/
ste = PA2VA(kstpa, u_int*);
pte = PA2VA(kptmpa, u_int*);
epte = &pte[nptpages];
protoste = kptpa | SG_RW | SG_V;
protopte = kptpa | PG_RW | PG_CI | PG_V;
while (pte < epte) {
*ste++ = protoste;
*pte++ = protopte;
protoste += PAGE_SIZE;
protopte += PAGE_SIZE;
}
/*
* Invalidate all but the last two remaining entries in both.
*/
epte = &(PA2VA(kptmpa, u_int *))[NPTEPG-2];
while (pte < epte) {
*ste++ = SG_NV;
*pte++ = PG_NV;
}
/*
* Initialize the last ones to point to Sysptmap and the page
* table page allocated earlier.
*/
*ste = kptmpa | SG_RW | SG_V;
*pte = kptmpa | PG_RW | PG_CI | PG_V;
ste++;
pte++;
*ste = lkptpa | SG_RW | SG_V;
*pte = lkptpa | PG_RW | PG_CI | PG_V;
}
/*
* Invalidate all entries in the last kernel PT page
* (u-area PTEs will be validated later).
*/
pte = PA2VA(lkptpa, u_int *);
epte = &pte[NPTEPG];
while (pte < epte)
*pte++ = PG_NV;
/*
* Initialize kernel page table.
* Start by invalidating the `nptpages' that we have allocated.
*/
pte = PA2VA(kptpa, u_int *);
epte = &pte[nptpages * NPTEPG];
while (pte < epte)
*pte++ = PG_NV;
/*
* Validate PTEs for kernel text (RO).
* Pages up to "start" must be writable for the ROM.
*/
pte = &(PA2VA(kptpa, u_int *))[m68k_btop(KERNBASE)];
/* XXX why KERNBASE relative? */
epte = &pte[m68k_btop(m68k_round_page(start))];
protopte = firstpa | PG_RW | PG_V;
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
/* XXX why KERNBASE relative? */
epte = &pte[m68k_btop(m68k_trunc_page(&etext))];
protopte = (protopte & ~PG_PROT) | PG_RO;
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
/*
* Validate PTEs for kernel data/bss, dynamic data allocated
* by us so far (nextpa - firstpa bytes), and pages for proc0
* u-area and page table allocated below (RW).
*/
epte = &(PA2VA(kptpa, u_int *))[m68k_btop(nextpa - firstpa)];
protopte = (protopte & ~PG_PROT) | PG_RW;
/*
* Enable copy-back caching of data pages
*/
if (mmutype == MMU_68040)
protopte |= PG_CCB;
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
#define PTE2VA(pte) m68k_ptob(pte - PA2VA(kptpa, pt_entry_t *))
protopte = IOBase | PG_RW | PG_CI | PG_V;
IOBase = PTE2VA(pte);
epte = &pte[IIOMAPSIZE];
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
protopte = (pt_entry_t)ROMBase | PG_RO | PG_V;
ROMBase = (void *)PTE2VA(pte);
epte = &pte[ROMMAPSIZE];
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
if (vidlen) {
protopte = m68k_trunc_page(mac68k_video.mv_phys) |
PG_RW | PG_V | PG_CI;
newvideoaddr = PTE2VA(pte)
+ m68k_page_offset(mac68k_video.mv_phys);
epte = &pte[VIDMAPSIZE];
while (pte < epte) {
*pte++ = protopte;
protopte += PAGE_SIZE;
}
}
virtual_avail = PTE2VA(pte);
/*
* Calculate important exported kernel virtual addresses
*/
/*
* Sysseg: base of kernel segment table
*/
Sysseg = PA2VA(kstpa, st_entry_t *);
/*
* Sysptmap: base of kernel page table map
*/
Sysptmap = PA2VA(kptmpa, pt_entry_t *);
/*
* Sysmap: kernel page table (as mapped through Sysptmap)
* Allocated at the end of KVA space.
*/
Sysmap = (pt_entry_t *)m68k_ptob((NPTEPG - 2) * NPTEPG);
/*
* Setup u-area for process 0.
*/
/*
* Zero the u-area.
* NOTE: `pte' and `epte' aren't PTEs here.
*/
pte = PA2VA(p0upa, u_int *);
epte = (u_int *)(PA2VA(p0upa, u_int) + USPACE);
while (pte < epte)
*pte++ = 0;
/*
* Remember the u-area address so it can be loaded in the
* proc struct p_addr field later.
*/
proc0paddr = PA2VA(p0upa, char *);
/*
* VM data structures are now initialized, set up data for
* the pmap module.
*
* Note about avail_end: msgbuf is initialized just after
* avail_end in machdep.c. Since the last page is used
* for rebooting the system (code is copied there and
* excution continues from copied code before the MMU
* is disabled), the msgbuf will get trounced between
* reboots if it's placed in the last physical page.
* To work around this, we move avail_end back one more
* page so the msgbuf can be preserved.
*/
avail_next = avail_start = m68k_round_page(nextpa);
avail_remaining = 0;
avail_range = -1;
for (i = 0; i < numranges; i++) {
if (low[i] <= avail_next && avail_next < high[i]) {
avail_range = i;
avail_remaining = high[i] - avail_next;
} else if (avail_range != -1) {
avail_remaining += (high[i] - low[i]);
}
}
physmem = m68k_btop(avail_remaining + nextpa - firstpa);
maxaddr = high[numranges - 1] - m68k_ptob(1);
high[numranges - 1] -= (m68k_round_page(MSGBUFSIZE) + m68k_ptob(1));
avail_end = high[numranges - 1];
mem_size = m68k_ptob(physmem);
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 above,
* 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 kptmpa and last-page page table
*/
if (mmutype == MMU_68040) {
int num;
kpm->pm_stfree = ~l2tobm(0);
num = roundup(nptpages * (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
*/
{
vaddr_t va = virtual_avail;
CADDR1 = (void *)va;
va += PAGE_SIZE;
CADDR2 = (void *)va;
va += PAGE_SIZE;
vmmap = (void *)va;
va += PAGE_SIZE;
msgbufaddr = (void *)va;
va += m68k_round_page(MSGBUFSIZE);
virtual_avail = va;
}
}
void
bootstrap_mac68k(int tc)
{
#if NZSC > 0
extern void zs_init(void);
#endif
extern int *esym;
paddr_t nextpa;
void *oldROMBase;
if (mac68k_machine.do_graybars)
printf("Bootstrapping NetBSD/mac68k.\n");
oldROMBase = ROMBase;
mac68k_video.mv_phys = mac68k_video.mv_kvaddr;
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!");
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%p -> 0x%p.\n",
(void *)mac68k_video.mv_kvaddr, (void *)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 NZSC > 0
if (zsinited != 0)
zs_init();
#endif
mac68k_video.mv_kvaddr = newvideoaddr;
}