From 598b964ee3c1fab162bfc85fa3725501ab238881 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Fri, 31 Mar 2023 18:41:36 -0400
Subject: entry.s and kernel.ld

---
 kernel/boot/entry.S | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 kernel/boot/entry.S

(limited to 'kernel/boot/entry.S')

diff --git a/kernel/boot/entry.S b/kernel/boot/entry.S
new file mode 100644
index 0000000..4c977a3
--- /dev/null
+++ b/kernel/boot/entry.S
@@ -0,0 +1,36 @@
+.section .text.init
+
+.globl _start
+_start:
+        csrw       satp, zero
+        csrw       sie, zero
+        csrw       sip, zero
+
+        .option push
+        .option norelax
+        la         gp, __global_pointer$
+        .option pop
+
+        la         sp, __stack_start
+        mv         t0, a0
+        li         t1, PAGE_SIZE 
+        mul        t0, t0, t1
+        add        sp, sp, t0
+
+        li         a2, 1
+        lla        a3, _boot_hart
+        amoswap.w, a3, a2, (a3)
+        bnez a3,   mp_entry 
+
+        la         a2, __bss_start
+        la         a3, __bss_end
+1:
+        sd         zero, (a2)
+        addi       a2, a2, __SIZEOF_POINTER__
+        blt        a2, a3, 1b 
+        
+        call       boot
+
+_boot_hart:
+        .dword 0
+
-- 
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