I can run plan9 perfectly in a Athlon 64 machine with a Asus A8V-MX in 32bits mode, VGA in 1024x768x16, but no Ether and no sound(AC'97). But I want to build all(kernel and apps) to run in pure 64bits mode. I can't found the 6c, mentioned in man page 2c(1), to build. I found a file /sys/src/cmd/8c/cgen64.c, it is to 8c use AMD 64bits capabilities? Plan9 can use AMD64 all 64 mode?
No, the x86-64 compiler is a separate source tree, I believe not yet released. That file contains support for implementing 64-bit arithmetic (long long) on the 32-bit x86. Russ
