Let API user handle syscalls

1 files changed, 40 insertions, 0 deletions

diff --git a/src/register_file.rs b/src/register_file.rs
new file mode 100644
index 0000000..6437eed
--- /dev/null
+++ b/src/register_file.rs
@@ -0,0 +1,40 @@
+// Copyright 2016 David Li
+// This file is part of rustv.
+
+// rustv is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// rustv is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with rustv.  If not, see <http://www.gnu.org/licenses/>.
+
+use isa;
+
+pub struct RegisterFile {
+    registers: [isa::Word; 32],
+}
+
+impl RegisterFile {
+    pub fn new() -> RegisterFile {
+        RegisterFile {
+            registers: [0; 32],
+        }
+    }
+
+    pub fn write_word<T: Into<isa::Register>>(&mut self, reg: T, value: isa::Word) {
+        // TODO: should be safe to use unchecked index
+        let reg = reg.into();
+        if reg == isa::Register::X0 { return; }
+        self.registers[reg.as_num()] = value;
+    }
+
+    pub fn read_word<T: Into<isa::Register>>(&mut self, reg: T) -> isa::Word {
+        self.registers[reg.into().as_num()]
+    }
+}