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Check for memory aliases when sizing physical memory. Remove 32MB memory

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restriction.

Tested with 32 x 1MB SIMM's plus mix of 4MB and 1MB SIMM's to ensure the
aliases is detected in all memory configuratiions.
This commit is contained in:
wdk 2000-08-17 05:05:01 +00:00
parent b6aaff9c44
commit b9333bd4e7
1 changed files with 58 additions and 47 deletions
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91
sys/arch/mipsco/mipsco/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.3 2000/08/16 21:54:44 wdk Exp $ */
/* $NetBSD: machdep.c,v 1.4 2000/08/17 05:05:01 wdk Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -43,7 +43,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.3 2000/08/16 21:54:44 wdk Exp $");
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.4 2000/08/17 05:05:01 wdk Exp $");
/* from: Utah Hdr: machdep.c 1.63 91/04/24 */
@ -109,9 +109,7 @@ vm_map_t exec_map = NULL;
vm_map_t mb_map = NULL;
vm_map_t phys_map = NULL;
int maxmem; /* max memory per process */
int physmem; /* max supported memory, changes to actual */
int physmem_max = 32*1024*1024 / NBPG; /* XXX: Pages */
phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;
@ -129,6 +127,7 @@ void configure __P((void));
void mach_init __P((int, char *[], char*[]));
void softintr_init __P((void));
int memsize_scan __P((caddr_t));
#ifdef DEBUG
/* stacktrace code violates prototypes to get callee's registers */
@ -222,41 +221,8 @@ mach_init(argc, argv, envp)
consinit();
/*
* The MIPS Rc3230 series machine have a really ugly memory
* alias that is difficult to detect.
*
* For now we limit the scan to 32MB which is the maximum
* onboard memory allowed when using 1MB SIMM's
*/
/*
* Non destructive scan of memory to determine the size
*/
physmem = btoc((vaddr_t)kernend - MIPS_KSEG0_START);
cp = (char *)MIPS_PHYS_TO_KSEG1(physmem << PGSHIFT);
while (cp < (char *)MIPS_MAX_MEM_ADDR) {
int i, j;
i = *(int *)cp;
j = ((int *)cp)[4];
*(int *)cp = 0xa5a5a5a5;
/*
* Data will persist on the bus if we read it right away.
* Have to be tricky here.
*/
((int *)cp)[4] = 0x5a5a5a5a;
wbflush();
if (*(int *)cp != 0xa5a5a5a5)
break;
*(int *)cp = i;
((int *)cp)[4] = j;
cp += NBPG;
if (physmem >= physmem_max)
break;
physmem++;
}
maxmem = physmem;
/* Find out how much memory is available. */
physmem = memsize_scan(kernend);
/*
* Now that we know how much memory we have, initialize the
@ -317,7 +283,7 @@ mach_init(argc, argv, envp)
break;
default:
printf("bootflag '%c' not recognised", *cp);
printf("bootflag '%c' not recognised\n", *cp);
}
}
}
@ -742,6 +708,51 @@ cpu_intr(status, cause, pc, ipending)
}
}
/*
* Find out how much memory is available by testing memory.
* Be careful to save and restore the original contents for msgbuf.
*/
int
memsize_scan(first)
caddr_t first;
{
volatile int *vp, *vp0;
int mem, tmp, tmp0;
#define PATTERN1 0xa5a5a5a5
#define PATTERN2 ~PATTERN1
/*
* Non destructive scan of memory to determine the size
* Use the first page to test for memory aliases. This
* also has the side effect of flushing the bus alignment
* buffer
*/
mem = btoc((paddr_t)first - MIPS_KSEG0_START);
vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT);
vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */
tmp0 = *vp0;
while (vp < (int *)MIPS_MAX_MEM_ADDR) {
tmp = *vp;
*vp = PATTERN1;
*vp0 = PATTERN2;
wbflush();
if (*vp != PATTERN1)
break;
*vp = PATTERN2;
*vp0 = PATTERN1;
wbflush();
if (*vp != PATTERN2)
break;
*vp = tmp;
vp += NBPG/sizeof(int);
mem++;
}
*vp0 = tmp0;
return mem;
}
#ifdef EXEC_ECOFF
#include <sys/exec_ecoff.h>