add 32-bit assembly

1 files changed, 17 insertions, 0 deletions

diff --git a/src/boot.s b/src/boot.s
new file mode 100644
index 0000000..2530d18
--- /dev/null
+++ b/src/boot.s
@@ -0,0 +1,17 @@
+.global _start
+.type _start, @function
+
+.code32
+// Entry point. It puts the machine into a consistent state,
+// starts the kernel and then waits forever.
+_start:
+    mov _sstack, %esp  // Setup the stack.
+
+    push %ebx   // Pass multiboot info structure.
+    push %eax   // Pass multiboot magic code.
+    call kmain  // Call the kernel.
+
+    // Halt the CPU.
+    cli
+    hlt
+