From 2163f68177213582f5b4cbcd66387ca8c2451c56 Mon Sep 17 00:00:00 2001
From: Stephen Marz <stephen.marz@utk.edu>
Date: Thu, 4 Jun 2020 18:06:42 -0400
Subject: [PATCH] Add descriptor elements and add yield

---
 risc_v/src/process.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/risc_v/src/process.rs b/risc_v/src/process.rs
index 5526a66..5a8a488 100644
--- a/risc_v/src/process.rs
+++ b/risc_v/src/process.rs
@@ -12,7 +12,7 @@ use crate::{cpu::{get_mtime,
                    unmap,
 				   zalloc,
 				   Table},
-            syscall::syscall_exit};
+            syscall::{syscall_exit, syscall_yield}};
 use alloc::{string::String, collections::{vec_deque::VecDeque, BTreeMap}};
 use core::ptr::null_mut;
 use crate::lock::Mutex;
@@ -169,7 +169,7 @@ fn init_process() {
 		// scheduler will loop until it finds a process to run. Since
 		// the scheduler is called in an interrupt context, nothing else
 		// can happen until a process becomes available.
-		unsafe { llvm_asm!("wfi") };
+		syscall_yield();
 	}
 }
 
@@ -416,6 +416,9 @@ impl Drop for Process {
 pub enum FileDescriptor {
 	File(Inode),
 	Device(usize),
+	Framebuffer(usize),
+	ButtonEvents,
+	AbsoluteEvents,
 	Network,
 	Unknown,
 }