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, 3 insertions, 1 deletions

diff --git a/mp.c b/mp.c
index ece46a4..341b545 100644
--- a/mp.c
+++ b/mp.c
@@ -219,9 +219,11 @@ mp_startthem(void)
 
   for(c = 0; c < ncpu; c++){
     if (c == cpu()) continue;
-    cprintf ("starting processor %d\n", c);
+    cprintf ("cpu%d: starting processor %d\n", cpu(), c);
     *(uint *)(APBOOTCODE-4) = (uint) (cpus[c].mpstack) + MPSTACK; // tell it what to use for %esp
     *(uint *)(APBOOTCODE-8) = (uint)mpmain; // tell it where to jump to
     lapic_startap(cpus[c].apicid, (uint) APBOOTCODE);
+    while(cpus[c].booted == 0)
+      ;
   }
 }