freebsd-nq/sys/sparc64/include
John Baldwin cc981af204 Add new bus methods for mapping resources.
Add a pair of bus methods that can be used to "map" resources for direct
CPU access using bus_space(9).  bus_map_resource() creates a mapping and
bus_unmap_resource() releases a previously created mapping.  Mappings are
described by 'struct resource_map' object.  Pointers to these objects can
be passed as the first argument to the bus_space wrapper API used for bus
resources.

Drivers that wish to map all of a resource using default settings
(for example, using uncacheable memory attributes) do not need to change.
However, drivers that wish to use non-default settings can now do so
without jumping through hoops.

First, an RF_UNMAPPED flag is added to request that a resource is not
implicitly mapped with the default settings when it is activated.  This
permits other activation steps (such as enabling I/O or memory decoding
in a device's PCI command register) to be taken without creating a
mapping.  Right now the AGP drivers don't set RF_ACTIVE to avoid using
up a large amount of KVA to map the AGP aperture on 32-bit platforms.
Once RF_UNMAPPED is supported on all platforms that support AGP this
can be changed to using RF_UNMAPPED with RF_ACTIVE instead.

Second, bus_map_resource accepts an optional structure that defines
additional settings for a given mapping.

For example, a driver can now request to map only a subset of a resource
instead of the entire range.  The AGP driver could also use this to only
map the first page of the aperture (IIRC, it calls pmap_mapdev() directly
to map the first page currently).  I will also eventually change the
PCI-PCI bridge driver to request mappings of the subset of the I/O window
resource on its parent side to create mappings for child devices rather
than passing child resources directly up to nexus to be mapped.  This
also permits bridges that do address translation to request suitable
mappings from a resource on the "upper" side of the bus when mapping
resources on the "lower" side of the bus.

Another attribute that can be specified is an alternate memory attribute
for memory-mapped resources.  This can be used to request a
Write-Combining mapping of a PCI BAR in an MI fashion.  (Currently the
drivers that do this call pmap_change_attr() directly for x86 only.)

Note that this commit only adds the MI framework.  Each platform needs
to add support for handling RF_UNMAPPED and thew new
bus_map/unmap_resource methods.  Generally speaking, any drivers that
are calling rman_set_bustag() and rman_set_bushandle() need to be
updated.

Discussed on:	arch
Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D5237
2016-05-20 17:57:47 +00:00
..
_align.h
_bus.h
_inttypes.h
_limits.h
_stdint.h
_types.h Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4 2014-04-01 14:46:11 +00:00
asi.h
asm.h Unbreak sparc64 after r276630 by calling __sparc_sigtramp_setup signal 2015-02-16 22:13:03 +00:00
asmacros.h
atomic.h Add an atomic_fetchadd_64() wrapper on sparc64. 2016-01-22 00:29:11 +00:00
bus_common.h
bus_dma.h Add bus_dmamap_load_ma() function to load map with the array of 2013-10-27 21:39:16 +00:00
bus_private.h Move the implementation of bus_space_barrier(9) to the inline function in 2013-10-24 17:06:41 +00:00
bus.h Since r296250 it is no longer possible for devices to use bus space 2016-04-10 22:43:36 +00:00
cache.h
ccr.h
clock.h
cmt.h
counter.h Fix issues with zeroing and fetching the counters, on x86 and ppc64. 2013-07-01 02:48:27 +00:00
cpu.h Revert r253748,253749 2013-07-28 18:44:17 +00:00
cpufunc.h
db_machdep.h
dcr.h
dump.h - Unbreak dumpsys(9) on sparc64 after r276772 2015-11-16 23:02:33 +00:00
elf.h
endian.h
exec.h
fireplane.h
float.h Rationalize BSD license on sys/*/include/float.h 2015-08-05 17:05:35 +00:00
floatingpoint.h
fp.h
frame.h
fsr.h Add a global MD macro for the VIS block size instead of duplicating 2012-08-31 11:15:01 +00:00
gdb_machdep.h
idprom.h
ieee.h
ieeefp.h
in_cksum.h Rationalize BSD license on sys/*/include/in_cksum.h 2015-08-05 19:05:12 +00:00
instr.h
intr_machdep.h - Give PIL_PREEMPT the lowest priority just above low/stray interrupts. 2012-10-20 12:07:48 +00:00
iommureg.h
iommuvar.h
jbus.h
kdb.h
kerneldump.h Add support to libkvm for reading vmcores from other architectures. 2015-11-27 18:58:26 +00:00
ktr.h Change the - hopefully - last piece of ktr(9) to use PCPU_GET(cpuid) 2015-12-30 18:57:29 +00:00
limits.h
lsu.h
mcntl.h
md_var.h Merge from r290547: 2015-11-21 02:49:33 +00:00
memdev.h
metadata.h
nexusvar.h
ofw_machdep.h Make using the #address-cells property on the interrupt parent in device 2016-01-02 19:28:35 +00:00
ofw_mem.h
ofw_nexus.h
param.h Add fueword(9) and casueword(9) functions. They are like fuword(9) 2014-10-28 15:22:13 +00:00
pcb.h
pcpu.h Add two new pmap functions: 2015-08-04 19:46:13 +00:00
pmap.h Remove unused member. 2013-08-04 21:17:05 +00:00
pmc_mdep.h
proc.h Implement GET_STACK_USAGE. 2013-09-29 13:09:25 +00:00
profile.h
pstate.h
ptrace.h
reg.h Move the 32-bit compatible procfs types from freebsd32.h to <sys/procfs.h> 2015-04-08 16:30:45 +00:00
reloc.h
resource.h
runq.h
sc_machdep.h
setjmp.h
sf_buf.h On sparc64, do not keep mappings for the destroyed sf_bufs. Sparc64 2014-08-10 16:59:39 +00:00
sigframe.h
signal.h
smp.h Merge r286374 from x86: 2015-09-13 00:08:04 +00:00
stack.h
stdarg.h
sysarch.h
tick.h
tlb.h
trap.h
tsb.h
tstate.h
tte.h
ucontext.h POSIX states that #include <signal.h> shall make both mcontext_t and 2016-02-12 07:38:19 +00:00
upa.h
utrap.h
varargs.h
vdso.h
ver.h
vm.h Add new bus methods for mapping resources. 2016-05-20 17:57:47 +00:00
vmparam.h Retire VM_FREEPOOL_CACHE as the next step in eliminating PG_CACHE pages. 2015-06-08 04:59:32 +00:00
watch.h
wstate.h