Date: Tue, 17 Feb 1998 22:32:44 GMT From: Dag-Erling Coidan Smørgrav <finrod@ppp097.uio.no> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: i386/5773: Cleanup of /usr/src/sys/i386/isa/lpt.c Message-ID: <199802172232.WAA00901@ppp097.uio.no>
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>Number: 5773
>Category: i386
>Synopsis: Cleanup of /usr/src/sys/i386/isa/lpt.c
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Tue Feb 17 14:40:04 PST 1998
>Last-Modified:
>Originator: Dag-Erling Coidan Smørgrav
>Organization:
University of Oslo, Department of Informatics
>Release: FreeBSD 2.2.5-STABLE i386
>Environment:
2.2.5-STABLE, cvsupped today.
>Description:
Cleanup of parallell port probe (specifically, testing of manually
configured port adresses), and debug option changed from DEBUG to
LPT_DEBUG. Shortens source code by a few lines and compiled code by
about a hundred bytes. No change in functionality.
Specifically, the old probing code used a sequence of for loops to
generate test bytes. I replaced these with a single loop which tests
the data register with bytes from a compiled-in table.
>How-To-Repeat:
N/A
>Fix:
--- /usr/src/sys/i386/conf/options.i386.orig Tue Feb 17 23:23:16 1998
+++ /usr/src/sys/i386/conf/options.i386 Tue Feb 17 23:22:20 1998
@@ -96,3 +96,5 @@
PCVT_SCREENSAVER opt_pcvt.h
PCVT_USEKBDSEC opt_pcvt.h
PCVT_VT220KEYB opt_pcvt.h
+
+LPT_DEBUG opt_lpt.h
--- /usr/src/sys/i386/isa/lpt.c.orig Tue Nov 12 10:08:38 1996
+++ /usr/src/sys/i386/isa/lpt.c Tue Feb 17 23:19:48 1998
@@ -101,6 +101,7 @@
* Poul-Henning Kamp <phk@freebsd.org>
*/
+#include "opt_lpt.h"
#include "lpt.h"
#include <sys/param.h>
@@ -190,7 +191,7 @@
#define BIOS_MAX_LPT 4
-#ifndef DEBUG
+#ifndef LPT_DEBUG
#define lprintf (void)
#else
#define lprintf if (lptflag) printf
@@ -301,6 +302,18 @@
/*
+ * Sequence of bytes to use for testing ports
+ */
+static u_char testbyte[18] = {
+ 0x55, /* Alternating zeros */
+ 0xaa, /* Alternating ones */
+ 0xfe, 0xfd, 0xfb, 0xf7,
+ 0xef, 0xdf, 0xbf, 0x7f, /* Walking zeros */
+ 0x01, 0x02, 0x04, 0x08,
+ 0x10, 0x20, 0x40, 0x80, /* Walking ones */
+};
+
+/*
* Internal routine to lptprobe to do port tests of one byte value
*/
static int
@@ -368,12 +381,8 @@
int
lptprobe(struct isa_device *dvp)
{
- int port;
+ int port, status, i;
static short next_bios_lpt = 0;
- int status;
- u_char data;
- u_char mask;
- int i;
/*
* Make sure there is some way for lptopen to see that
@@ -395,28 +404,13 @@
/* Port was explicitly specified */
/* This allows probing of ports unknown to the BIOS */
-
port = dvp->id_iobase + lpt_data;
- mask = 0xff;
- data = 0x55; /* Alternating zeros */
- if (!lpt_port_test(port, data, mask))
- { status = 0 ; goto end_probe ; }
-
- data = 0xaa; /* Alternating ones */
- if (!lpt_port_test(port, data, mask))
- { status = 0 ; goto end_probe ; }
-
- for (i = 0; i < 8; i++) { /* Walking zero */
- data = ~(1 << i);
- if (!lpt_port_test(port, data, mask))
- { status = 0 ; goto end_probe ; }
- }
-
- for (i = 0; i < 8; i++) { /* Walking one */
- data = (1 << i);
- if (!lpt_port_test(port, data, mask))
- { status = 0 ; goto end_probe ; }
- }
+ for (i = 0; i < 18; i++)
+ if (!lpt_port_test(port, testbyte[i], 0xff))
+ {
+ status = 0;
+ goto end_probe;
+ }
end_probe:
/* write 0's to control and data ports */
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