Introduce the new BL handover interface
This patch introduces a new BL handover interface. It essentially allows
passing 4 arguments between the different BL stages. Effort has been made
so as to be compatible with the previous handover interface. The previous
blx_early_platform_setup() platform API is now deprecated and the new
blx_early_platform_setup2() variant is introduced. The weak compatiblity
implementation for the new API is done in the `plat_bl_common.c` file.
Some of the new arguments in the new API will be reserved for generic
code use when dynamic configuration support is implemented. Otherwise
the other registers are available for platform use.
Change-Id: Ifddfe2ea8e32497fe1beb565cac155ad9d50d404
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
diff --git a/bl2/aarch64/bl2_entrypoint.S b/bl2/aarch64/bl2_entrypoint.S
index 3ab8b5a..bc8cbfd 100644
--- a/bl2/aarch64/bl2_entrypoint.S
+++ b/bl2/aarch64/bl2_entrypoint.S
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2013-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -15,12 +15,14 @@
func bl2_entrypoint
/*---------------------------------------------
- * Save from x1 the extents of the tzram
- * available to BL2 for future use.
- * x0 is not currently used.
+ * Save arguments x0 - x3 from BL1 for future
+ * use.
* ---------------------------------------------
*/
- mov x20, x1
+ mov x20, x0
+ mov x21, x1
+ mov x22, x2
+ mov x23, x3
/* ---------------------------------------------
* Set the exception vector to something sane.
@@ -103,7 +105,11 @@
* ---------------------------------------------
*/
mov x0, x20
- bl bl2_early_platform_setup
+ mov x1, x21
+ mov x2, x22
+ mov x3, x23
+ bl bl2_early_platform_setup2
+
bl bl2_plat_arch_setup
/* ---------------------------------------------