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Path: xanth!ames!mailrus!ulowell!page
From: page@swan.ulowell.edu (Bob Page)
Newsgroups: comp.sources.amiga
Subject: v89i021: md - memory diagnostic
Message-ID: <11760@swan.ulowell.edu>
Date: 17 Feb 89 01:23:05 GMT
Organization: University of Lowell, Computer Science Dept.
Lines: 560
Approved: page@swan.ulowell.edu
Submitted-by: jc3b21!fgd3@uunet.UU.NET (Fabbian G. Dufoe)
Posting-number: Volume 89, Issue 21
Archive-name: hardware/md.1
[uuencode executable included. ..Bob]
# This is a shell archive.
# Remove everything above and including the cut line.
# Then run the rest of the file through sh.
#----cut here-----cut here-----cut here-----cut here----#
#!/bin/sh
# shar: Shell Archiver
# Run the following text with /bin/sh to create:
# ReadMe
# Makefile
# MD.c
# MD.doc
# MD.uue
# This archive created: Thu Feb 16 20:20:53 1989
cat << \SHAR_EOF > ReadMe
This archive contains the source, documentation, and executable for a
public domain memory diagnostic program. When you unpack the archive you
should have the following files:
ReadMe--This file.
MD--The executable program (may be packed as MD.uue, requiring you to
run "uudecode").
MD.doc--The documentation file explaining how MD works and how to use
it.
Makefile--Input for the Lattice LMK program to create MD from the
source.
MD.c--The source code for MD.
MD.uue--The executable program in uuencoded form. To create the
executable run "uudecode MD.uue".
MD will run with any Amiga configuration but requires a stack size of
10000. It does not take over the machine but it does soak up any available
memory while it is running. It takes about 8 minutes to test a 2.5MB
machine.
SHAR_EOF
cat << \SHAR_EOF > Makefile
# Compile and link MD
MD: MD.o
blink FROM LIB:c.o+MD.o TO MD LIB LIB:lc.lib+LIB:amiga.lib NODEBUG SMALLCODE SMALLDATA MAP ram:MD.map
MD.o: MD.c
lc MD
SHAR_EOF
cat << \SHAR_EOF > MD.c
/* MD.c
by Fabbian G. Dufoe, III
This is a public domain program. Use it however you like.
This program tests any memory which the operating system will allocate to
it. It tests the memory one byte at a time by setting it to 0x00, the
comparing it to 0x00, setting it to 0xff, and comparing it to 0xff. If
the comparison fails it writes the memory address (the pointer value),
the expected contents, and the actual contents of the memory location to
standard output. Standard output may be redirected to a file if it is
desired to save the report.
*/
#define NULL 0L
#define SIZE 1000
#define VERSION "Version 1.0, 10 January 1989\n\n"
#include <time.h>
#include <stdio.h>
typedef struct
{
unsigned char *ptr;
unsigned long int size;
} Block;
void
main()
{
Block block[SIZE];
unsigned short int count = 0;
unsigned long int errct = 0;
unsigned short int high;
unsigned long int offset;
unsigned char *ptr;
unsigned long int size;
signed long int t;
static unsigned char TestVal[] = {0, 0xff, 0x55, 0xaa};
unsigned short int val;
/* We want to include the time the diagnostic program was run in the
report. That requires getting the current system time.
*/
time(&t);
/* We'll print a report heading and copyright notice at the beginning.
*/
printf("MD--Memory Diagnostic.\n");
printf("by Fabbian G. Dufoe, III\n");
printf(VERSION);
printf("Memory tested %s\n\n", ctime(&t));
/* We'll start by allocating memory in blocks of one megabyte. The plan
is to allocate as many one-megabyte blocks as we can. Then we'll
halve the block size, allocate as many blocks of that size as we can,
and repeat the process until (a) all the memory is gone or (b) we've
filled the array we allocated for keeping track of memory blocks.
*/
size = 1048576;
while (size > 0 && count < SIZE)
{
fprintf(stderr, "Allocating %ld byte blocks.\n", size);
while ((ptr = (unsigned char *)malloc(size)) != NULL)
{
block[count].ptr = ptr;
block[count++].size = size;
}
if (size == 1)
size = 0;
else
size >>= 1;
}
/* Because we expect to seldom use the entire array we've set aside we
need to save the number of the highest element actually used.
*/
high = count;
/* At this point we want to sort the block pointers. It makes the output
easier to follow if memory errors are reported in ascending order
by their address. We aren't guaranteed that memory will be
allocated in any particular order. We'll use an insertion sort and
we'll sort only that part of the array we used. That means we'll
keep the index values between 0 and high.
An insertion sort works by shifting all the items left of the current
one right one position until an item is less than the current one.
Imagine the items to be sorted are laid out from left to right. Then
the sort places the current item in the position vacated by the last
item to be shifted right. The sort starts with the second item as
the current one and proceeds to the right until all the items have had
a turn as the current one.
*/
fprintf(stderr, "Sorting block list.\n");
for (count = 1; count < high; count++)
{
short int i;
ptr = block[count].ptr;
size = block[count].size;
i = count - 1;
while (i >=0 && ptr < block[i].ptr)
{
block[i+1].ptr = block[i].ptr;
block[i+1].size = block[i].size;
i--;
}
block[i+1].ptr = ptr;
block[i+1].size = size;
}
fprintf(stderr, "Sort complete.\n");
/* We'll list the block addresses and size in the report.
*/
printf("Blocks examined:\n");
printf("Block # Address Size\n\n");
for (count = 0; count < high; count++)
{
printf("%4d %8lX %7ld\n", count, block[count].ptr,
block[count].size);
}
printf("\n");
/* Now that we've sorted our list of blocks we're ready to start testing
them. The first step is to initialize all the variables to 0, the
first test value.
*/
for (count = 0; count < high; count++)
{
fprintf(stderr, "Initializing block %d, %ld bytes.\n", count,
block[count].size);
for (offset = 0; offset < block[count].size; offset++)
*(block[count].ptr+offset) = TestVal[0];
}
/* Next we'll go through all the blocks to see if they contain the test
value with which they were loaded. If not we'll identify the address
that failed, the value it contained, and the value it should have
contained. We'll do that for each valid test value.
*/
for (val = 1; val < 4; val++)
{
fprintf(stderr, "Testing value %X.\n", TestVal[val-1]);
for (count = 0; count < high; count++)
{
fprintf(stderr, "Testing block %d, %ld bytes with %X\n", count,
block[count].size, TestVal[val-1]);
for (offset = 0; offset < block[count].size; offset++)
{
if (*(block[count].ptr+offset) != TestVal[val-1])
{
printf("ERROR! Address: %8lX found: %2X expected: %2X\n",
block[count].ptr+offset, *(block[count].ptr+offset),
TestVal[val-1]);
errct++;
}
*(block[count].ptr+offset) = TestVal[val];
}
}
}
/* We've tested for all values except the last one. It's time to do that
now.
*/
val--;
fprintf(stderr, "Testing value %X.\n", TestVal[val]);
for (count = 0; count < high; count++)
{
fprintf(stderr, "Testing block %d, %ld bytes with %X\n", count,
block[count].size, TestVal[val]);
for (offset = 0; offset < block[count].size; offset++)
{
if (*(block[count].ptr+offset) != TestVal[val])
{
printf("ERROR! Address: %8lX found: %2X expected: %2X\n",
block[count].ptr+offset, *(block[count].ptr+offset),
TestVal[val]);
errct++;
}
}
}
/* The testing is finished so we'll report the number of errors we found.
*/
printf("\nMD found %d errors.\n", errct);
/* When we've completed all our tests we free all the memory we allocated
and exit. */
for (count = 0; count < high; count++)
{
fprintf(stderr, "Freeing block %d.\n", count);
free(block[count].ptr);
}
exit(0);
}
SHAR_EOF
cat << \SHAR_EOF > MD.doc
MD--Memory Diagnostic
by Fabbian G. Dufoe, III
10 January 1989
MD is a simple memory diagnostic program. It allocates as much memory
as it can, writes a value to it, and reads the value. If the value read is
not the same as the value MD wrote MD reports an error. It repeats the
process until each byte of memory has been tested with four test values:
0x00, 0xff, 0x55, and 0xaa. The error report identifies the address where
the bad value was found, the value found, and the value expected.
In addition to the error report MD writes status messages as it runs to
keep you posted on its progress. Status messages are sent to standard error
while the error report is sent to standard output. That allows you to
direct the report to a disk file for later review and printing. The status
messages won't be included in the report, because standard error is not
redirected.
MD is designed for the CLI environment. To run it type "MD" at a CLI
or Shell prompt. You may send the error report to a disk file or an
AmigaDOS device by redirecting it. For example, you can save the error
report in MD.rpt by typing "MD >MD.rpt". You can print the report by typing
"MD >PRT:".
MD does not take over the machine. However, it does allocate memory
until the system won't give it any more. It starts by asking for 1 MB
blocks. When the system won't give it any more that size it cuts the
requested size in half. This process continues until the system won't give
it any 1-byte blocks.
The next phase is to sort the blocks so the report will be in ascending
order by address. MD keeps an array with the block pointer and the size of
the block. Once the array is sorted MD initializes all the blocks with
zeroes (0x00).
Then it tests each block byte by byte. If the byte is not equal to the
last value store there MD reports the error. It then assigns the next test
value before moving on to the next byte. It repeats that process for each
test value.
When all the memory has been tested with all the test values MD frees
all the blocks and terminates.
The error report begins with a heading identifying the program, a line
telling when the test was run, and a list of the blocks examined. For each
block the report shows the block number, its starting address, and its size
in bytes. Each error found is listed individually. The reports gives the
address where the error occurred, the value found at that address, and the
value expected. Finally the report states the total number of errors found.
MD takes about 8 minutes to test a 2.5MB machine. During that time
there will not be enough memory left to run other jobs. When MD finishes,
however, it will release all the memory it used and other jobs can resume
without rebooting. MD will not interfere with other jobs that are executing
when it is invoked but it is possible to create a deadlock if there are
other active jobs in the system. Besides that, MD cannot test memory that
is allocated to another process. Consequently, it is best to run MD
immediately after booting the system.
Send questions, comments, or bug reports to:
--Fabbian Dufoe
350 Ling-A-Mor Terrace South
St. Petersburg, Florida 33705
813-823-2350
UUCP: ...uunet!pdn!jc3b21!fgd3
SHAR_EOF
cat << \SHAR_EOF > MD.uue
begin 644 MD
M```#\P`````````"``````````$```BN```![````^D```BN)$@D`$GY````0
M`$?Y```$U'(`(#P```"W8`(FP5'(__PL>``$*4X%#"E/!11"K`40)FX!%'``7
M(CP``#``3J[^SBEK`)@%"$JK`*QG``!P(`^0KP`$!H````"`*4`$V&$``2X@T
M:P"LT<C1R")H`!#3R=/)(`)R`!(9*4D%'-"!4H!"9U*``D#__I_`58!"=P@`_
M(`)3@-2!'[(``"``4X)1R/_V'[P`("``4X(?L2``(`!1RO_X(D\O"6```'@I:
M:P`Z!-AP?U*`T:P$V&$``,)!ZP!<3J[^@$'K`%Q.KOZ,*4`%$"\`)$`@*@`D-
M9Q(L;`>0($`B*```*4$%"$ZN_X(B*@`@9QHD/````^U.KO_B*4`%&&<*Y8@@D
M0"=H``@`I"!L!1`O"$AL!-0@:``D*6@`!`4<3KH$S$ZZ"TAP`&`$("\`!"\`*
M("P%`&<$($!.D$ZZ%B0L>``$(FP'D$ZN_F).N@2B2JP%$&<:(BP%&&<$3J[_P
MW"QX``1.KO]\(FP%$$ZN_H8@'RYL!11.=7!D8+1#^@`0<`!.KOW8*4`'D&?L<
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SHAR_EOF
# End of shell archive
exit 0
--
Bob Page, U of Lowell CS Dept. page@swan.ulowell.edu ulowell!page
Have five nice days.