From 912d2e3c7eb1baa71dda2c0a28aa5809eaa96f27 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 16 Jul 2022 13:33:00 +0200
Subject: amd64: barely boot into kernel code

---
 src/kernel/arch/amd64/boot64.s | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 src/kernel/arch/amd64/boot64.s

(limited to 'src/kernel/arch/amd64/boot64.s')

diff --git a/src/kernel/arch/amd64/boot64.s b/src/kernel/arch/amd64/boot64.s
new file mode 100644
index 0000000..1dca0ca
--- /dev/null
+++ b/src/kernel/arch/amd64/boot64.s
@@ -0,0 +1,13 @@
+.global boot64
+boot64:
+	lgdt (lgdt_arg) // try reloading gdt again
+	mov $(5 << 3 | 3), %ax // SEG_TSS
+	ltr %ax
+
+	xchgw %bx, %bx
+	push %rdi // preserve multiboot struct
+	call sysenter_setup
+	pop %rdi
+
+	// multiboot struct in %rdi
+	jmp kmain_early
-- 
cgit v1.2.3