From 9966b49db468de0168c7a455dfb5b4c66c413c4d Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sun, 19 Dec 2021 17:10:36 +0200
Subject: Massive changes to jump to userspace

---
 arch/riscv/kernel/proc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 arch/riscv/kernel/proc.c

(limited to 'arch/riscv/kernel/proc.c')

diff --git a/arch/riscv/kernel/proc.c b/arch/riscv/kernel/proc.c
new file mode 100644
index 0000000..3a39dd3
--- /dev/null
+++ b/arch/riscv/kernel/proc.c
@@ -0,0 +1,15 @@
+#include <apos/tcb.h>
+#include <apos/elf.h>
+#include <csr.h>
+
+void jump_to_userspace(struct tcb *t, char **argv, int argc)
+{
+	csr_write(CSR_SEPC, bin_entry(t->bin));
+	__asm__("mv sp, %0\n" : "=r" (t->stack) :: "memory");
+	__asm__("sret\n" ::: "memory");
+}
+
+void return_to_userspace(struct tcb *t)
+{
+	/* lol */
+}
-- 
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