swtch saves callee-saved registers

swtch idles on per-CPU stack, not on calling process's stack
fix pipe bugs
usertest.c tests pipes, fork, exit, close

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index 979048c..4c2a2f9 100644
--- a/main.c
+++ b/main.c
@@ -46,7 +46,7 @@ main()
   p = &proc[0];
   curproc[cpu()] = p;
   p->state = WAITING;
-  p->sz = PAGE;
+  p->sz = 4 * PAGE;
   p->mem = kalloc(p->sz);
   memset(p->mem, 0, p->sz);
   p->kstack = kalloc(KSTACKSIZE);