Preparations for refactoring

1 files changed, 16 insertions, 0 deletions

diff --git a/common/proc.c b/common/proc.c
new file mode 100644
index 0000000..5fdf413
--- /dev/null
+++ b/common/proc.c
@@ -0,0 +1,16 @@
+#include <apos/proc.h>
+
+/* TODO: add error checking */
+vm_t setup_call_stack(struct tcb *t, vm_t start, size_t bytes)
+{
+	pm_t offset = 0;
+	size_t pages = __pages(bytes);
+	uint8_t flags = VM_V | VM_R | VM_W | VM_U;
+	for(size_t i = 0; i < pages; ++i)
+	{
+		offset = alloc_page(BASE_PAGE, offset);
+		map_vmem(t->b_r, offset, start + BASE_PAGE_SIZE * i, flags, BASE_PAGE);
+	}
+
+	return start;
+}