From 25108684fe235d4296c3cbc480298df209682586 Mon Sep 17 00:00:00 2001
From: stefan <stefan@s00.xyz>
Date: Tue, 4 Apr 2023 06:01:50 +0000
Subject: build system and some other stuff

---
 sys/kern/entry.S | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 sys/kern/entry.S

(limited to 'sys/kern/entry.S')

diff --git a/sys/kern/entry.S b/sys/kern/entry.S
new file mode 100644
index 0000000..5ad0490
--- /dev/null
+++ b/sys/kern/entry.S
@@ -0,0 +1,39 @@
+.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
+        li         t1, PAGE_SIZE 
+        mul        t1, t1, a0
+        add        sp, sp, t1
+
+        li         a2, 1
+        lla        a3, _boot_hart
+        amoswap.w  a3, a2, (a3)
+        bnez a3,   _spin
+
+        la         a2, __bss_start
+        la         a3, __bss_end
+1:
+        sd	   zero, (a2)
+        addi       a2, a2, __SIZEOF_POINTER__
+        blt        a2, a3, 1b 
+        
+        call       init
+
+
+_spin:
+	wfi
+	j _spin
+
+.section ".data"
+_boot_hart: .word 0
-- 
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