fix race in holding() check in acquire()

give cpu1 a TSS and gdt for when it enters scheduler()
and a pseudo proc[] entry for each cpu
cpu0 waits for each other cpu to start up
read() for files

1 files changed, 1 insertions, 0 deletions

diff --git a/fd.h b/fd.h
index 442ee34..1be1cf0 100644
--- a/fd.h
+++ b/fd.h
@@ -5,6 +5,7 @@ struct fd {
   char writeable;
   struct pipe *pipe;
   struct inode *ip;
+  uint off;
 };
 
 extern struct fd fds[NFD];