From e1e772dca5291dd5e5de085b9d41e266896dceb3 Mon Sep 17 00:00:00 2001
From: Paul Pan <i@0x7f.app>
Date: Mon, 17 Jun 2024 00:44:29 +0800
Subject: [PATCH] fix: uapi: add missing conversions between LookupFailure and
 SysError

---
 uapi/src/error.rs |  2 +-
 uapi/src/fault.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/uapi/src/error.rs b/uapi/src/error.rs
index 5d77d76..3ed3c5a 100644
--- a/uapi/src/error.rs
+++ b/uapi/src/error.rs
@@ -7,7 +7,7 @@ pub enum SysError {
     RangeError,      // Untyped
     NotMapped,       // Frame
     AlreadyMapped,   // Frame
-    MissingEntry,    // Frame
+    MissingEntry,    // CNode, Frame
 }
 
 pub type SysResult<T = ()> = Result<T, SysError>;
diff --git a/uapi/src/fault.rs b/uapi/src/fault.rs
index 8c0a05a..8173e54 100644
--- a/uapi/src/fault.rs
+++ b/uapi/src/fault.rs
@@ -1,3 +1,4 @@
+use crate::error::SysError;
 use utils::addr::VirtAddr;
 
 #[derive(Clone, Copy, Debug)]
@@ -17,6 +18,17 @@ pub enum LookupFailure {
     },
 }
 
+impl From<LookupFailure> for SysError {
+    fn from(e: LookupFailure) -> SysError {
+        match e {
+            LookupFailure::InvalidRoot => SysError::MissingEntry,
+            LookupFailure::MissingCapability { .. } => SysError::MissingEntry,
+            LookupFailure::DepthMismatch { .. } => SysError::InvalidArgument,
+            LookupFailure::GuardMismatch { .. } => SysError::InvalidArgument,
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug)]
 pub struct CapFault {
     address:          usize,