From 36137438446c1754a522c5b3cc3aff92c43ac1ee Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksa@vuckovic.cc>
Date: Wed, 13 Dec 2023 01:38:14 +0100
Subject: Initial commit X86/X86_64 debug/release WORKING

riscv64 WORKING uart

idk
---
 src/arch/riscv64/boot/entry.S | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 src/arch/riscv64/boot/entry.S

(limited to 'src/arch/riscv64/boot/entry.S')

diff --git a/src/arch/riscv64/boot/entry.S b/src/arch/riscv64/boot/entry.S
new file mode 100644
index 0000000..f5fa092
--- /dev/null
+++ b/src/arch/riscv64/boot/entry.S
@@ -0,0 +1,37 @@
+.section .init
+
+.option norvc
+
+.type start, @function
+.global start
+start:
+	.cfi_startproc
+
+.option push
+.option norelax
+	la gp, global_pointer
+.option pop
+
+	/* Reset satp */
+	csrw satp, zero
+
+	/* Setup stack */
+	la sp, stack_top
+
+	/* Clear the BSS section */
+	la t5, bss_start
+	la t6, bss_end
+bss_clear:
+	sd zero, (t5)
+	addi t5, t5, 8
+	bltu t5, t6, bss_clear
+
+	la t0, kernel_main
+	csrw sepc, t0
+
+	/* Jump to kernel! */
+	tail kernel_main
+
+	.cfi_endproc
+
+.end
-- 
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