commit 944ade852b7d7b713c1adcd768770d53444c43a4
author Louis Mayencourt <louis.mayencourt@arm.com> Thu Aug 08 12:03:26 2019 +0100
committer Louis Mayencourt <louis.mayencourt@arm.com> Fri Feb 07 13:29:09 2020 +0000
tree 665d7fbb82c1d741bf5ec049b015034f87fab720
parent e1debf8205373995d5cce9165d10496cd89087b4

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>

bl2/bl2.ld.S

diff --git a/bl2/bl2.ld.S b/bl2/bl2.ld.S
index 6230562..c1338e2 100644
--- a/bl2/bl2.ld.S
+++ b/bl2/bl2.ld.S
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -46,6 +46,11 @@
         __RODATA_START__ = .;
         *(SORT_BY_ALIGNMENT(.rodata*))
 
+       . = ALIGN(8);
+        __FCONF_POPULATOR_START__ = .;
+        KEEP(*(.fconf_populator))
+        __FCONF_POPULATOR_END__ = .;
+
         /* Ensure 8-byte alignment for descriptors and ensure inclusion */
         . = ALIGN(8);
         __PARSER_LIB_DESCS_START__ = .;
@@ -62,6 +67,11 @@
         *(SORT_BY_ALIGNMENT(.text*))
         *(SORT_BY_ALIGNMENT(.rodata*))
 
+	. = ALIGN(8);
+         __FCONF_POPULATOR_START__ = .;
+         KEEP(*(.fconf_populator))
+         __FCONF_POPULATOR_END__ = .;
+
         /* Ensure 8-byte alignment for descriptors and ensure inclusion */
         . = ALIGN(8);
         __PARSER_LIB_DESCS_START__ = .;