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| author | aiju <devnull@localhost> | 2011-04-15 21:47:11 +0200 |
|---|---|---|
| committer | aiju <devnull@localhost> | 2011-04-15 21:47:11 +0200 |
| commit | 6ca93675ed11b7eb2615a4e5d005bfc18496d32a (patch) | |
| tree | 3af399e0b9c99d30cf18de482de29a46879b8d42 | |
| parent | 0159ee648e182cb6617596bf4f3ff45bf632610b (diff) | |
| download | plan9front-6ca93675ed11b7eb2615a4e5d005bfc18496d32a.tar.xz | |
added /dev/mordor
| -rw-r--r-- | sys/man/3/arch | 5 | ||||
| -rw-r--r-- | sys/src/9/pc/devarch.c | 15 |
2 files changed, 20 insertions, 0 deletions
diff --git a/sys/man/3/arch b/sys/man/3/arch index 7cd5e82fb..77ef0276f 100644 --- a/sys/man/3/arch +++ b/sys/man/3/arch @@ -12,6 +12,7 @@ arch \- architecture-specific information and control .B /dev/iol .B /dev/iow .B /dev/irqalloc +.B /dev/mordor .SH DESCRIPTION This device presents textual information about PC hardware and allows user-level control of the I/O ports on x86-class and DEC Alpha machines. @@ -121,6 +122,10 @@ cause 8-bit wide, 16-bit wide, and 32-bit wide requests to I/O ports. The port accessed is determined by the byte offset of the file descriptor. +.PP +Reads and writes to +.IR mordor +will inevitably cause the front to fall off. .SH EXAMPLE The following code reads from an x86 byte I/O port. .IP diff --git a/sys/src/9/pc/devarch.c b/sys/src/9/pc/devarch.c index 3228736ee..c45271682 100644 --- a/sys/src/9/pc/devarch.c +++ b/sys/src/9/pc/devarch.c @@ -987,6 +987,20 @@ archctlwrite(Chan*, void *a, long n, vlong) return n; } +static long +mordorread(Chan*, void*, long, vlong) +{ + error("one does not simply read from mordor"); + return 0; +} + +static long +mordorwrite(Chan*, void*, long, vlong) +{ + error("one does not simply write into mordor"); + return 0; +} + void archinit(void) { @@ -1035,6 +1049,7 @@ archinit(void) addarchfile("cputype", 0444, cputyperead, nil); addarchfile("archctl", 0664, archctlread, archctlwrite); + addarchfile("mordor", 0666, mordorread, mordorwrite); } /* |