fconf: initial commit
Introduce the Firmware CONfiguration Framework (fconf).
The fconf is an abstraction layer for platform specific data, allowing
a "property" to be queried and a value retrieved without the requesting
entity knowing what backing store is being used to hold the data.
The default backing store used is C structure. If another backing store
has to be used, the platform integrator needs to provide a "populate()"
function to fill the corresponding C structure.
The "populate()" function must be registered to the fconf framework with
the "FCONF_REGISTER_POPULATOR()". This ensures that the function would
be called inside the "fconf_populate()" function.
A two level macro is used as getter:
- the first macro takes 3 parameters and converts it to a function
call: FCONF_GET_PROPERTY(a,b,c) -> a__b_getter(c).
- the second level defines a__b_getter(c) to the matching C structure,
variable, array, function, etc..
Ex: Get a Chain of trust property:
1) FCONF_GET_PROPERY(tbbr, cot, BL2_id) -> tbbr__cot_getter(BL2_id)
2) tbbr__cot_getter(BL2_id) -> cot_desc_ptr[BL2_id]
Change-Id: Id394001353ed295bc680c3f543af0cf8da549469
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
diff --git a/lib/fconf/fconf.c b/lib/fconf/fconf.c
new file mode 100644
index 0000000..387e758
--- /dev/null
+++ b/lib/fconf/fconf.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019-2020, ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <common/debug.h>
+#include <lib/fconf/fconf.h>
+#include <libfdt.h>
+#include <platform_def.h>
+
+void fconf_populate(uintptr_t config)
+{
+ assert(config != 0UL);
+
+ /* Check if the pointer to DTB is correct */
+ if (fdt_check_header((void *)config) != 0) {
+ ERROR("FCONF: Invalid DTB file passed for FW_CONFIG\n");
+ panic();
+ }
+
+ INFO("FCONF: Reading firmware configuration file from: 0x%lx\n", config);
+
+ /* Go through all registered populate functions */
+ IMPORT_SYM(struct fconf_populator *, __FCONF_POPULATOR_START__, start);
+ IMPORT_SYM(struct fconf_populator *, __FCONF_POPULATOR_END__, end);
+ const struct fconf_populator *populator;
+
+ for (populator = start; populator != end; populator++) {
+ assert((populator->info != NULL) && (populator->populate != NULL));
+
+ INFO("FCONF: Reading firmware configuration information for: %s\n", populator->info);
+ if (populator->populate(config) != 0) {
+ /* TODO: handle property miss */
+ panic();
+ }
+ }
+}