Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
can squash for v2
---
drivers/of/reserved-mem.c | 65 +++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
create mode 100644 drivers/of/reserved-mem.c
diff --git a/drivers/of/reserved-mem.c b/drivers/of/reserved-mem.c
new file mode 100644
index 000000000000..efa96fe65cd9
--- /dev/null
+++ b/drivers/of/reserved-mem.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: 2021 Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>, Pengutronix
+
+#define pr_fmt(fmt) "reserved-memory: " fmt
+
+#include <common.h>
+#include <init.h>
+#include <of.h>
+#include <of_address.h>
+
+static void reserve(const char *name, u64 start, u64 end, bool xn)
+{
+ int flags = OF_RESERVE_ENTRY_FLAG_NO_FIXUP;
+
+ if (xn)
+ flags |= OF_RESERVE_ENTRY_FLAG_RUNTIME_FW;
+
+ pr_debug("region %s 0x%08llx-0x%08llx\n", name, start, end);
+
+ of_add_reserve_entry(start, end, flags);
+}
+
+static int reserved_mem_read(void)
+{
+ struct device_node *node, *child;
+ struct resource resource;
+ const __be32 *reg;
+
+ node = of_find_node_by_path("/reserved-memory");
+ if (node) {
+ for_each_available_child_of_node(node, child) {
+ /* skip e.g. linux,cma */
+ if (!of_get_property(child, "reg", NULL))
+ continue;
+
+ of_address_to_resource(child, 0, &resource);
+
+ /*
+ * Just keep on mapping 1:1, but avoid speculative
+ * execution into such a region
+ */
+ reserve(child->name,
+ resource.start, resource.end,
+ of_find_property(child, "no-map", 0));
+ }
+ }
+
+ node = of_find_node_by_path("/memreserve");
+ reg = of_get_property(node, "reg", NULL);
+ if (reg) {
+ u32 na = 2, ns = 2;
+ u64 addr, size;
+
+ of_property_read_u32(node, "#address-cells", &na);
+ of_property_read_u32(node, "#size-cells", &ns);
+
+ addr = of_read_number(reg, na);
+ size = of_read_number(reg + na, ns);
+
+ reserve("/memreserve", addr, addr + size - 1, false);
+ }
+
+ return 0;
+}
+postconsole_initcall(reserved_mem_read);
--
2.30.2
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