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Code Issues Releases Activity

Unconditionally turning on the I/O and memory enable bits in the PCI

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command register is too aggressive.  Revert to the previous behaviour, but
leave the new behaviour available as an undocumented option.  It's not
clear what the Right, Right Thing is to do here, but the more conservative
approach is safer.
This commit is contained in:
Mike Smith 2000-10-28 23:07:13 +00:00
parent 14a7806366
commit f53e8493fb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=67820
2 changed files with 28 additions and 2 deletions
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15
sys/dev/pci/pci.c
View File

@ -985,7 +985,14 @@ pci_add_map(device_t pcib, int b, int s, int f, int reg,
else
printf(", enabled\n");
}
/*
* This code theoretically does the right thing, but has
* undesirable side effects in some cases where
* peripherals respond oddly to having these bits
* enabled. Leave them alone by default.
*/
#ifdef PCI_ENABLE_IO_MODES
/* Turn on resources that have been left off by a lazy BIOS */
if (type == SYS_RES_IOPORT && !pci_porten(pcib, b, s, f)) {
cmd = PCIB_READ_CONFIG(pcib, b, s, f, PCIR_COMMAND, 2);
@ -997,6 +1004,12 @@ pci_add_map(device_t pcib, int b, int s, int f, int reg,
cmd |= PCIM_CMD_MEMEN;
PCIB_WRITE_CONFIG(pcib, b, s, f, PCIR_COMMAND, cmd, 2);
}
#else
if (type == SYS_RES_IOPORT && !pci_porten(cfg))
return 1;
if (type == SYS_RES_MEMORY && !pci_memen(cfg))
return 1;
#endif
resource_list_add(rl, type, reg,
base, base + (1 << ln2size) - 1,

15
sys/pci/pci.c
View File

@ -985,7 +985,14 @@ pci_add_map(device_t pcib, int b, int s, int f, int reg,
else
printf(", enabled\n");
}
/*
* This code theoretically does the right thing, but has
* undesirable side effects in some cases where
* peripherals respond oddly to having these bits
* enabled. Leave them alone by default.
*/
#ifdef PCI_ENABLE_IO_MODES
/* Turn on resources that have been left off by a lazy BIOS */
if (type == SYS_RES_IOPORT && !pci_porten(pcib, b, s, f)) {
cmd = PCIB_READ_CONFIG(pcib, b, s, f, PCIR_COMMAND, 2);
@ -997,6 +1004,12 @@ pci_add_map(device_t pcib, int b, int s, int f, int reg,
cmd |= PCIM_CMD_MEMEN;
PCIB_WRITE_CONFIG(pcib, b, s, f, PCIR_COMMAND, cmd, 2);
}
#else
if (type == SYS_RES_IOPORT && !pci_porten(cfg))
return 1;
if (type == SYS_RES_MEMORY && !pci_memen(cfg))
return 1;
#endif
resource_list_add(rl, type, reg,
base, base + (1 << ln2size) - 1,