rename common to src

+ I keep starting to type src and wondering why autocomplete won't work,
  I guess src is just uncounciously a better name

1 files changed, 59 insertions, 0 deletions

diff --git a/src/mem.c b/src/mem.c
new file mode 100644
index 0000000..e3f98e7
--- /dev/null
+++ b/src/mem.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: copyleft-next-0.3.1 */
+/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
+
+/**
+ * @file mem.c
+ * Generic memory handling, used both by physical and virtual memory.
+ */
+
+#include <kmi/types.h>
+#include <kmi/mem.h>
+#include <kmi/vmem.h>
+#include <libfdt.h>
+
+size_t __mm_shifts[10];
+size_t __mm_widths[10];
+size_t __mm_sizes[10];
+size_t __mm_page_shift;
+enum mm_order __mm_max_order;
+
+/**
+ * RAM base address. Not sure if it should be provided through a macro
+ * like __mm_*.
+ */
+pm_t ram_base;
+
+enum mm_order nearest_order(size_t size)
+{
+	for (enum mm_order order = max_order(); order >= MM_MIN; --order)
+		if (order_size(order) >= size)
+			return order;
+
+	return MM_O0;
+}
+
+void init_mem(size_t max_order, size_t bits[10], size_t page_shift)
+{
+	__mm_max_order = max_order;
+	__mm_page_shift = page_shift;
+
+	__mm_shifts[0] = page_shift;
+	__mm_widths[0] = 1 << bits[0];
+	__mm_sizes[0] = 1 << __mm_page_shift;
+
+	for (enum mm_order i = MM_O1; i <= max_order(); ++i) {
+		__mm_widths[i] = 1 << bits[i];
+		__mm_shifts[i] = __mm_shifts[i - 1] + bits[i - 1];
+		__mm_sizes[i] = 1UL << __mm_shifts[i];
+	}
+}
+
+void set_ram_base(uintptr_t base)
+{
+	ram_base = base;
+}
+
+uintptr_t get_ram_base()
+{
+	return ram_base;
+}