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Some machines (e.g., IIcx) have '030 and map all of memory (4 gigs) with

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the MMU.  Added sanity checking in the get_mapping() call to catch this
and stop at the end of RAM.  Now available RAM is min of booter-specified
amount and what the MMU maps.

Also added remap_rom() ifdef'ed out which uses early termination pte's
to map 8 megs of ROM.
This commit is contained in:
lkestel 1994-08-08 00:11:40 +00:00
parent acb0c1ec5f
commit ddd8267edb
1 changed files with 60 additions and 7 deletions
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67
sys/arch/mac68k/mac68k/machdep.c
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@ -72,7 +72,7 @@
* from: Utah $Hdr: machdep.c 1.63 91/04/24$
*
* from: @(#)machdep.c 7.16 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.26 1994/07/31 14:50:27 briggs Exp $
* $Id: machdep.c,v 1.27 1994/08/08 00:11:40 lkestel Exp $
*/
#include <param.h>
@ -2623,8 +2623,7 @@ void printstar (void)
unsigned int get_mapping (void)
{
int i, same;
unsigned long addr;
unsigned long phys;
unsigned long addr, lastpage, phys;
numranges = 0;
for (i = 0; i < 8; i++) {
@ -2632,7 +2631,10 @@ unsigned int get_mapping (void)
high[i] = 0;
}
for (addr = 0; get_physical (addr, &phys); addr += NBPG) {
lastpage = get_top_of_ram ();
for (addr = 0; addr <= lastpage && get_physical (addr, &phys);
addr += NBPG) {
/* printf ("0x%x --> 0x%x\n", addr, phys); */
if (numranges > 0 && phys == high[numranges - 1]) {
high[numranges - 1] += NBPG;
@ -2771,6 +2773,15 @@ unsigned int get_mapping (void)
return low[0]; /* Return physical address of logical 0 */
}
/*
* remap_kernel()
*
* The booter might have loaded the kernel across a bank break. Since
* locore maps the kernel as if it was load contiguously, we've got
* to go back here and remap it properly according to the bank mapping
* that we found in get_mapping().
*/
static void remap_kernel (unsigned long *pt)
{
int i, len, numleft;
@ -2794,6 +2805,15 @@ static void remap_kernel (unsigned long *pt)
/* Not likely to get here */
}
/*
* remap_nubus()
*
* Locore maps all of NuBus space linearly. Some systems that have
* internal video at physical 0 map the screen into NuBus space.
* Here we go back and remap NuBus the way the MacOS had it so that
* we can use their address for video.
*/
static void remap_nubus (unsigned long *pt)
{
int i, len;
@ -2821,13 +2841,46 @@ static void remap_nubus (unsigned long *pt)
}
/*
* LAK: (7/30/94) This function remaps kernel and NuBus pages the way they
* were done in MacOS. "pt" is the address of the first kernel page table.
* remap_rom()
*
* Remaps the first 8 megs of ROM. Uses early-termination pages.
*/
void remap_MMU (unsigned long pt)
static void remap_rom (unsigned long *st)
{
unsigned long addr, index;
/*
* Commented out right now because we don't use it and this code
* hasn't been tested yet. Make sure to uncomment the code in
* pmap_init() if this is uncommented.
*/
#if 0
addr = 0x40000000;
index = addr / 0x400000;
st[index] = addr | 0x01;
addr += 0x400000;
index++;
st[index] = addr | 0x01;
#endif
}
/*
* remap_MMU()
*
* This function remaps kernel and NuBus pages the way they were done
* in MacOS. "st" is the address of the segment table, and "pt" is
* the address of the first kernel page table.
*/
void remap_MMU (unsigned long st, unsigned long pt)
{
remap_kernel ((unsigned long *)pt);
remap_nubus ((unsigned long *)(pt +
((Sysptsize + (IIOMAPSIZE+NPTEPG-1)/NPTEPG) << PGSHIFT)));
remap_rom ((unsigned long *)st);
}