PSCI: Add deprecated API for SPD when compatibility is disabled
This patch defines deprecated platform APIs to enable Trusted
Firmware components like Secure Payload and their dispatchers(SPD)
to continue to build and run when platform compatibility is disabled.
This decouples the migration of platform ports to the new platform API
from SPD and enables them to be migrated independently. The deprecated
platform APIs defined in this patch are : platform_get_core_pos(),
platform_get_stack() and platform_set_stack().
The patch also deprecates MPIDR based context management helpers like
cm_get_context_by_mpidr(), cm_set_context_by_mpidr() and cm_init_context().
A mechanism to deprecate APIs and identify callers of these APIs during
build is introduced, which is controlled by the build flag WARN_DEPRECATED.
If WARN_DEPRECATED is defined to 1, the users of the deprecated APIs will be
flagged either as a link error for assembly files or compile time warning
for C files during build.
Change-Id: Ib72c7d5dc956e1a74d2294a939205b200f055613
diff --git a/plat/common/aarch64/platform_helpers.S b/plat/common/aarch64/platform_helpers.S
index b88603c..9f4b672 100644
--- a/plat/common/aarch64/platform_helpers.S
+++ b/plat/common/aarch64/platform_helpers.S
@@ -38,6 +38,33 @@
.weak plat_reset_handler
.weak plat_disable_acp
+#if !ENABLE_PLAT_COMPAT
+ .globl platform_get_core_pos
+
+#define MPIDR_RES_BIT_MASK 0xff000000
+
+ /* ------------------------------------------------------------------
+ * int platform_get_core_pos(int mpidr)
+ * Returns the CPU index of the CPU specified by mpidr. This is
+ * defined when platform compatibility is disabled to enable Trusted
+ * Firmware components like SPD using the old platform API to work.
+ * This API is deprecated and it assumes that the mpidr specified is
+ * that of a valid and present CPU. Instead, plat_my_core_pos()
+ * should be used for CPU index of the current CPU and
+ * plat_core_pos_by_mpidr() should be used for CPU index of a
+ * CPU specified by its mpidr.
+ * ------------------------------------------------------------------
+ */
+func_deprecated platform_get_core_pos
+ bic x0, x0, #MPIDR_RES_BIT_MASK
+ mrs x1, mpidr_el1
+ bic x1, x1, #MPIDR_RES_BIT_MASK
+ cmp x0, x1
+ beq plat_my_core_pos
+ b platform_core_pos_helper
+endfunc_deprecated platform_get_core_pos
+#endif
+
/* -----------------------------------------------------
* Placeholder function which should be redefined by
* each platform.