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| -rw-r--r-- | share/man/man9/bus_space.9 | 51 |
1 files changed, 1 insertions, 50 deletions
diff --git a/share/man/man9/bus_space.9 b/share/man/man9/bus_space.9 index 84cdf4785c9..052084400c8 100644 --- a/share/man/man9/bus_space.9 +++ b/share/man/man9/bus_space.9 @@ -1,4 +1,4 @@ -.\" $OpenBSD: bus_space.9,v 1.24 2013/01/29 01:31:59 dlg Exp $ +.\" $OpenBSD: bus_space.9,v 1.25 2013/01/29 01:37:00 dlg Exp $ .\" $NetBSD: bus_space.9,v 1.15 2000/08/09 03:11:00 tv Exp $ .\" .\" Copyright (c) 1997 The NetBSD Foundation, Inc. @@ -1473,55 +1473,6 @@ In all other respects these functions are the same as their non-raw counterparts. Please consult the documentation for those functions for further information. -.Sh EXPECTED CHANGES TO THE BUS_SPACE FUNCTIONS -The definition of the -.Nm -functions should not yet be considered finalized. -There are several changes and improvements which should be explored, -including: -.Bl -bullet -.It -Providing a mechanism by which incorrectly-written drivers will be -automatically given barriers and properly-written drivers won't be -forced to use more barriers than they need. -This should probably be done via a -.Li #define -in the incorrectly-written drivers. -Unfortunately, at this time, few drivers actually use barriers correctly -(or at all). -Because of that, -.Nm -implementations on architectures which do buffering must always do the -barriers inside the -.Nm -calls, to be safe. -That has a potentially significant performance impact. -.It -Exporting the -.Nm -functions to user-land so that applications (such as X servers) have -easier, more portable access to device space. -.It -Redefining bus space tags and handles so that machine-independent bus -interface drivers (for example PCI to VME bridges) could define and -implement bus spaces without requiring machine-dependent code. -If this is done, it should be done in such a way that machine-dependent -optimizations should remain possible. -.It -Converting bus spaces (such as PCI configuration space) which currently -use space-specific access methods to use the -.Nm -functions where that is appropriate. -.It -Redefining the way bus space is mapped and allocated, so that mapping -and allocation are done with bus specific functions which return bus -space tags. -This would allow further optimization than is currently possible, and -would also ease translation of the -.Nm -functions into user space (since mapping in user space would look like -it just used a different bus-specific mapping function). -.El .Sh SEE ALSO .Xr bus_dma 9 .Sh HISTORY |