From 20fa8584e31d55b7f2953f917adcc190adab236f Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Tue, 31 Aug 2021 08:31:10 -0700
Subject: Initial Commit

---
 src/kernel.S | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/kernel.S

(limited to 'src/kernel.S')

diff --git a/src/kernel.S b/src/kernel.S
new file mode 100644
index 0000000..02894a6
--- /dev/null
+++ b/src/kernel.S
@@ -0,0 +1,24 @@
+.section ".text.kernel"
+
+.globl kernel_main
+kernel_main:
+	push {lr}
+	bl uart_init
+	bl enable_irq
+	ldr r0, =os_info
+	bl uart_string
+	mov r0, #0x00
+kernel_main.a:
+	cmp r0, #0x100
+	beq kernel_main.loop
+	bl uart_char
+	add r0, #1
+	b kernel_main.a
+kernel_main.loop:
+	bl io_halt
+	b kernel_main.loop
+	pop {lr}
+
+.section ".data"
+os_info:
+    .asciz "Sergey Bilovytskyy's Real Time Operating System\n Version 0.0a\n Interrupt 01: uart rx interrupt\n Exit        : Ctrl-A x\n Monitor     : Ctrl-A c\n\n"
-- 
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