Massive changes to jump to userspace

1 files changed, 15 insertions, 0 deletions

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 */
+}