1 files changed, 17 insertions, 0 deletions
diff --git a/guest/guest64.S b/guest/guest64.S
new file mode 100644
index 0000000..1862749
--- /dev/null
+++ b/guest/guest64.S
@@ -0,0 +1,17 @@
+.intel_syntax noprefix
+
+.section .boot, "ax", @progbits
+    // Trigger `KVM_EXIT_IO:KVM_EXIT_IO_OUT` by writing string to output port.
+    mov rdx, 0x1000             // Output port.
+    lea rsi, [rip + msg]        // Address of string.
+    mov rcx, [rip + msg_len]    // Len of string.
+    rep outsb                   // Write ds:rsi to output port rdx.
+
+    // Trigger `KVM_EXIT_HLT`.
+    hlt
+
+.section .rodata, "a", @progbits
+msg:
+    .asciz "Hello from Long Mode!\n"
+msg_len:
+    .byte .-msg