From 9342ce3c324d58ec2fec8637fb836b86dfadbc7e Mon Sep 17 00:00:00 2001
From: GZTimeWalker <gztimewalker@163.com>
Date: Tue, 29 Mar 2022 19:44:45 +0800
Subject: [PATCH] v0.3.0: basic display & console & interrupt

---
 pkg/kernel/.cargo/config     | 3 +++
 pkg/kernel/src/main.rs       | 5 +++++
 pkg/kernel/src/utils/math.rs | 9 ++++++---
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/pkg/kernel/.cargo/config b/pkg/kernel/.cargo/config
index f6f0df3..9b51a69 100644
--- a/pkg/kernel/.cargo/config
+++ b/pkg/kernel/.cargo/config
@@ -4,3 +4,6 @@ target = "config/x86_64-unknown-none.json"
 [unstable]
 build-std-features = ["compiler-builtins-mem"]
 build-std = ["core", "compiler_builtins"]
+
+[env]
+LOG = "trace"
diff --git a/pkg/kernel/src/main.rs b/pkg/kernel/src/main.rs
index 2f7503f..01f7c28 100644
--- a/pkg/kernel/src/main.rs
+++ b/pkg/kernel/src/main.rs
@@ -48,5 +48,10 @@ pub fn kernal_main(boot_info: &'static BootInfo) -> ! {
     x86_64::instructions::interrupts::enable();
     info!("Interrupts Enabled.");
 
+    trace!("Trace?");
+    debug!("Debug Test.");
+    warn!("Warning Test.");
+    error!("ERROR!!!");
+
     loop {}
 }
diff --git a/pkg/kernel/src/utils/math.rs b/pkg/kernel/src/utils/math.rs
index e6d0a1d..b34a94c 100644
--- a/pkg/kernel/src/utils/math.rs
+++ b/pkg/kernel/src/utils/math.rs
@@ -1,17 +1,20 @@
 extern crate libm;
 
-macro_rules! no_mangle {
+/// export functions in libm for float calculate
+///
+/// ref: https://github.com/rust-lang/compiler-builtins/blob/master/src/math.rs
+macro_rules! libm_export {
     ($(fn $fun:ident($($iid:ident : $ity:ty),+) -> $oty:ty;)+) => {
         $(
             #[no_mangle]
             pub extern "C" fn $fun($($iid: $ity),+) -> $oty {
-                self::libm::$fun($($iid),+)
+                libm::$fun($($iid),+)
             }
         )+
     }
 }
 
-no_mangle! {
+libm_export! {
     fn acos(x: f64) -> f64;
     fn asin(x: f64) -> f64;
     fn cbrt(x: f64) -> f64;