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Code Issues Releases Activity

Make the evil broken pnpbios compensation slightly less evil.

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This is the hack that compensates for when bios vendors "forget" to
include the fdc control (0x3f7) port in their io port mappings.  Instead
of accessing ports outside of a range allocated to a handle, simply
allocate the port directly.  It even shows up in the probe..
This commit is contained in:
Peter Wemm 2000-01-05 17:42:43 +00:00
parent 8e1b368f04
commit b9da888fcb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55471
2 changed files with 40 additions and 30 deletions
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35
sys/dev/fdc/fdc.c
View File

@ -642,27 +642,32 @@ fdc_alloc_resources(struct fdc_data *fdc)
* have a different method of programming the transfer speed which
* doesn't require the control register, but it's mighty bogus as the
* chip still responds to the address for the control register.
* This hack is truely evil as we use the 6th port in a 4-port chunk.
*/
/* 0x3f2-0x3f5 */
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4 &&
bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
fdc->port_off = -2;
ispnp = 0; /* hack, don't reserve second port chunk */
}
/* 0x3f0-0x3f5 */
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 6 &&
bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
ispnp = 0; /* hack, don't reserve second port chunk */
}
if (ispnp) {
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
int cntport0;
int cntport1;
u_long ctlstart;
u_long ctlend;
cntport0 = bus_get_resource_count(dev, SYS_RES_IOPORT, 0);
cntport1 = bus_get_resource_count(dev, SYS_RES_IOPORT, 1);
ctlstart = 0ul;
ctlend = ~0ul;
if (cntport0 == 4)
fdc->port_off = -2;
if (cntport1 == 0) {
/* GRRR, request a specific port */
ctlstart = rman_get_start(fdc->res_ioport) +
fdc->port_off + 7; /* usually 0x3f7 */
ctlend = ctlstart;
if (bootverbose)
device_printf(dev, "added missing ctrl port\n");
}
fdc->flags |= FDC_ISPNP;
fdc->rid_ctl = 1;
fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
&fdc->rid_ctl, 0ul, ~0ul,
1, RF_ACTIVE);
&fdc->rid_ctl, ctlstart,
ctlend, 1, RF_ACTIVE);
if (fdc->res_ctl == 0) {
device_printf(dev, "cannot reserve I/O port range 2\n");
return ENXIO;

35
sys/isa/fd.c
View File

@ -642,27 +642,32 @@ fdc_alloc_resources(struct fdc_data *fdc)
* have a different method of programming the transfer speed which
* doesn't require the control register, but it's mighty bogus as the
* chip still responds to the address for the control register.
* This hack is truely evil as we use the 6th port in a 4-port chunk.
*/
/* 0x3f2-0x3f5 */
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4 &&
bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
fdc->port_off = -2;
ispnp = 0; /* hack, don't reserve second port chunk */
}
/* 0x3f0-0x3f5 */
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 6 &&
bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
ispnp = 0; /* hack, don't reserve second port chunk */
}
if (ispnp) {
if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
int cntport0;
int cntport1;
u_long ctlstart;
u_long ctlend;
cntport0 = bus_get_resource_count(dev, SYS_RES_IOPORT, 0);
cntport1 = bus_get_resource_count(dev, SYS_RES_IOPORT, 1);
ctlstart = 0ul;
ctlend = ~0ul;
if (cntport0 == 4)
fdc->port_off = -2;
if (cntport1 == 0) {
/* GRRR, request a specific port */
ctlstart = rman_get_start(fdc->res_ioport) +
fdc->port_off + 7; /* usually 0x3f7 */
ctlend = ctlstart;
if (bootverbose)
device_printf(dev, "added missing ctrl port\n");
}
fdc->flags |= FDC_ISPNP;
fdc->rid_ctl = 1;
fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
&fdc->rid_ctl, 0ul, ~0ul,
1, RF_ACTIVE);
&fdc->rid_ctl, ctlstart,
ctlend, 1, RF_ACTIVE);
if (fdc->res_ctl == 0) {
device_printf(dev, "cannot reserve I/O port range 2\n");
return ENXIO;