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Sync with sys/i386/isa/lpt.c revision 1.167.

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This commit is contained in:
KATO Takenori 1998-02-20 12:25:23 +00:00
parent 20bea78d8c
commit 116e73ba18
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=33674
1 changed files with 14 additions and 23 deletions
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37
sys/pc98/pc98/lpt.c
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@ -46,7 +46,7 @@
* SUCH DAMAGE.
*
* from: unknown origin, 386BSD 0.1
* $Id: lpt.c,v 1.16 1998/01/08 23:42:13 eivind Exp $
* $Id: lpt.c,v 1.17 1998/01/24 02:54:38 eivind Exp $
*/
/*
@ -389,8 +389,14 @@ lptprobe(struct isa_device *dvp)
int port;
static short next_bios_lpt = 0;
int status;
u_char data;
u_char mask;
static u_char testbyte[18] = {
0x55, /* alternating zeros */
0xaa, /* alternating ones */
0xfe, 0xfd, 0xfb, 0xf7,
0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80 /* walking one */
};
int i;
/*
@ -413,27 +419,12 @@ lptprobe(struct isa_device *dvp)
/* 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: