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| author | marcel <marcel@FreeBSD.org> | 2010-01-11 18:10:13 +0000 |
|---|---|---|
| committer | marcel <marcel@FreeBSD.org> | 2010-01-11 18:10:13 +0000 |
| commit | ef030a7c4e43d2fb1ce55adec76e421469429f09 (patch) | |
| tree | 834b257443dad54b930e9a553da6a313a6b0093e /sys/ia64/conf/DEFAULTS | |
| parent | 5467bb48693ab3341378081f870bc148f76d5aa8 (diff) | |
| download | FreeBSD-src-ef030a7c4e43d2fb1ce55adec76e421469429f09.zip FreeBSD-src-ef030a7c4e43d2fb1ce55adec76e421469429f09.tar.gz | |
Use io(4) for I/O port access on ia64, rather than through sysarch(2).
I/O port access is implemented on Itanium by reading and writing to a
special region in memory. To hide details and avoid misaligned memory
accesses, a process did I/O port reads and writes by making a MD system
call. There's one fatal problem with this approach: unprivileged access
was not being prevented. /dev/io serves that purpose on amd64/i386, so
employ it on ia64 as well. Use an ioctl for doing the actual I/O and
remove the sysarch(2) interface.
Backward compatibility is not being considered. The sysarch(2) approach
was added to support X11, but support for FreeBSD/ia64 was never fully
implemented in X11. Thus, nothing gets broken that didn't need more work
to begin with.
MFC after: 1 week
Diffstat (limited to 'sys/ia64/conf/DEFAULTS')
| -rw-r--r-- | sys/ia64/conf/DEFAULTS | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/ia64/conf/DEFAULTS b/sys/ia64/conf/DEFAULTS index 625ff90..2cb2330 100644 --- a/sys/ia64/conf/DEFAULTS +++ b/sys/ia64/conf/DEFAULTS @@ -9,6 +9,7 @@ machine ia64 device acpi # ACPI support # Pseudo devices. +device io # I/O & EFI runtime device device mem # Memory and kernel memory devices # UART chips on this platform |
