interrupt: add irq_save/restore helpers

Signed-off-by: Tianhao Wang <shrik3@mailbox.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/arch/x86_64/mod.rs b/src/arch/x86_64/mod.rs
index ee51338..38b08b1 100644
--- a/src/arch/x86_64/mod.rs
+++ b/src/arch/x86_64/mod.rs
@@ -4,3 +4,19 @@ pub mod io_port;
 pub mod mem;
 pub mod misc;
 pub mod paging;
+use core::arch::asm;
+
+pub const RFLAGS_IF_MASK: u64 = 1 << 9;
+#[inline]
+pub fn read_rflags() -> u64 {
+	let rflags;
+	unsafe {
+		asm!("pushfq; popq {}", out(reg) rflags);
+	}
+	rflags
+}
+
+pub fn is_int_enabled() -> bool {
+	let rf = read_rflags();
+	return (rf & RFLAGS_IF_MASK) != 0;
+}