layout boot-stage framework for aa64

[lunaix-os.git] / lunaix-os / arch / aarch64 / boot / start.S

diff --git a/lunaix-os/arch/aarch64/boot/start.S b/lunaix-os/arch/aarch64/boot/start.S
new file mode 100644 (file)
index 0000000..ed11af9
--- /dev/null
+++ b/lunaix-os/arch/aarch64/boot/start.S
@@ -0,0 +1,26 @@
+.section .boot.data
+    .align 16
+    stack_end:
+        .skip 512
+    stack_top:
+
+.section .boot.text
+    .global start_
+
+    /*
+        We follow Linux-arm64 boot protocol
+            ldr x0, dtb
+            mov x1, xzr
+            mov x2, xzr
+            mov x3, xzr
+     */
+    start_:
+        ldr sp, =stack_top
+        mov fp, xzr
+
+        ldr x4, =aarch64_init
+        blx x4
+         
+        // x0: ptr to boot_handoff
+        ldr x4, =kernel_bootstrap
+        blx x4
\ No newline at end of file