diff options
| author | Brad Smith <brad@cvs.openbsd.org> | 2006-04-07 01:04:50 +0000 |
|---|---|---|
| committer | Brad Smith <brad@cvs.openbsd.org> | 2006-04-07 01:04:50 +0000 |
| commit | 2b1cfc3386b297ab81942c33c83f0d3e7793efaa (patch) | |
| tree | 4cc7fd2eed058f0aeb943e8f05f2f2059e792210 /sys/dev/pci | |
| parent | da675f40fefca37deefd78b185bf8d371de83a7a (diff) | |
implement a check whether a BAR is present at all at a given
configuration space address, pci_mapreg_probe().
From NetBSD
ok dlg@
Diffstat (limited to 'sys/dev/pci')
| -rw-r--r-- | sys/dev/pci/pci_map.c | 35 | ||||
| -rw-r--r-- | sys/dev/pci/pcivar.h | 3 |
2 files changed, 29 insertions, 9 deletions
diff --git a/sys/dev/pci/pci_map.c b/sys/dev/pci/pci_map.c index 06f9136f202..92c73b14ceb 100644 --- a/sys/dev/pci/pci_map.c +++ b/sys/dev/pci/pci_map.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pci_map.c,v 1.13 2006/03/19 22:28:40 brad Exp $ */ +/* $OpenBSD: pci_map.c,v 1.14 2006/04/07 01:04:49 brad Exp $ */ /* $NetBSD: pci_map.c,v 1.7 2000/05/10 16:58:42 thorpej Exp $ */ /*- @@ -236,17 +236,36 @@ pci_mem_find(pci_chipset_tag_t pc, pcitag_t pcitag, int reg, cacheablep)); } +#define _PCI_MAPREG_TYPEBITS(reg) \ + (PCI_MAPREG_TYPE(reg) == PCI_MAPREG_TYPE_IO ? \ + reg & PCI_MAPREG_TYPE_MASK : \ + reg & (PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK)) + pcireg_t pci_mapreg_type(pci_chipset_tag_t pc, pcitag_t tag, int reg) { - pcireg_t rv; + return (_PCI_MAPREG_TYPEBITS(pci_conf_read(pc, tag, reg))); +} - rv = pci_conf_read(pc, tag, reg); - if (PCI_MAPREG_TYPE(rv) == PCI_MAPREG_TYPE_IO) - rv &= PCI_MAPREG_TYPE_MASK; - else - rv &= PCI_MAPREG_TYPE_MASK|PCI_MAPREG_MEM_TYPE_MASK; - return (rv); +int +pci_mapreg_probe(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *typep) +{ + pcireg_t address, mask; + int s; + + s = splhigh(); + address = pci_conf_read(pc, tag, reg); + pci_conf_write(pc, tag, reg, 0xffffffff); + mask = pci_conf_read(pc, tag, reg); + pci_conf_write(pc, tag, reg, address); + splx(s); + + if (mask == 0) /* unimplemented mapping register */ + return (0); + + if (typep) + *typep = _PCI_MAPREG_TYPEBITS(address); + return (1); } int diff --git a/sys/dev/pci/pcivar.h b/sys/dev/pci/pcivar.h index cabf04e4946..f2e3f4fc25b 100644 --- a/sys/dev/pci/pcivar.h +++ b/sys/dev/pci/pcivar.h @@ -1,4 +1,4 @@ -/* $OpenBSD: pcivar.h,v 1.47 2006/03/22 00:36:03 jsg Exp $ */ +/* $OpenBSD: pcivar.h,v 1.48 2006/04/07 01:04:49 brad Exp $ */ /* $NetBSD: pcivar.h,v 1.23 1997/06/06 23:48:05 thorpej Exp $ */ /* @@ -182,6 +182,7 @@ struct pci_softc { * Configuration space access and utility functions. (Note that most, * e.g. make_tag, conf_read, conf_write are declared by pci_machdep.h.) */ +int pci_mapreg_probe(pci_chipset_tag_t, pcitag_t, int, pcireg_t *); pcireg_t pci_mapreg_type(pci_chipset_tag_t, pcitag_t, int); int pci_mapreg_info(pci_chipset_tag_t, pcitag_t, int, pcireg_t, bus_addr_t *, bus_size_t *, int *); |