AArch32: Add essential ARM platform and FVP support
This patch adds AArch32 support for FVP and implements common platform APIs
like `plat_get_my_stack`, `plat_set_my_stack`, `plat_my_core_cos` for AArch32.
Only Multi Processor(MP) implementations of these functions are considered in
this patch. The ARM Standard platform layer helpers are implemented for
AArch32 and the common makefiles are modified to cater for both AArch64 and
AArch32 builds. Compatibility with the deprecated platform API is not
supported for AArch32.
Change-Id: Iad228400613eec91abf731b49e21a15bcf2833ea
diff --git a/plat/arm/common/aarch32/arm_helpers.S b/plat/arm/common/aarch32/arm_helpers.S
new file mode 100644
index 0000000..0839913
--- /dev/null
+++ b/plat/arm/common/aarch32/arm_helpers.S
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <asm_macros.S>
+#include <platform_def.h>
+
+ .weak plat_arm_calc_core_pos
+ .weak plat_my_core_pos
+
+ /* -----------------------------------------------------
+ * unsigned int plat_my_core_pos(void)
+ * This function uses the plat_arm_calc_core_pos()
+ * definition to get the index of the calling CPU.
+ * -----------------------------------------------------
+ */
+func plat_my_core_pos
+ ldcopr r0, MPIDR
+ b plat_arm_calc_core_pos
+endfunc plat_my_core_pos
+
+ /* -----------------------------------------------------
+ * unsigned int plat_arm_calc_core_pos(uint64_t mpidr)
+ * Helper function to calculate the core position.
+ * With this function: CorePos = (ClusterId * 4) +
+ * CoreId
+ * -----------------------------------------------------
+ */
+func plat_arm_calc_core_pos
+ and r1, r0, #MPIDR_CPU_MASK
+ and r0, r0, #MPIDR_CLUSTER_MASK
+ add r0, r1, r0, LSR #6
+ bx lr
+endfunc plat_arm_calc_core_pos