plat/arm: sds: Move to drivers/ folder
Change-Id: Ia601d5ad65ab199e747fb60af4979b7db477d249
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/drivers/arm/css/sds/aarch64/sds_helpers.S b/drivers/arm/css/sds/aarch64/sds_helpers.S
new file mode 100644
index 0000000..3256c2b
--- /dev/null
+++ b/drivers/arm/css/sds/aarch64/sds_helpers.S
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <drivers/arm/css/sds.h>
+#include <platform_def.h>
+
+#include "../sds_private.h"
+
+ .globl sds_get_primary_cpu_id
+
+ /*
+ * int sds_get_primary_cpu_id(void);
+ * Return the primary CPI ID from SDS Structure
+ * Returns CPUID on success or -1 on failure
+ */
+func sds_get_primary_cpu_id
+ mov_imm x0, PLAT_ARM_SDS_MEM_BASE
+ mov w2, #SDS_REGION_SIGNATURE
+ ldr w1, [x0]
+
+ /* Check if the SDS region signature found */
+ cmp w2, w1, uxth
+ b.ne 2f
+
+ /* Get the structure count from region descriptor in `w1 */
+ ubfx w1, w1, #SDS_REGION_STRUCT_COUNT_SHIFT, #SDS_REGION_STRUCT_COUNT_WIDTH
+ cbz w1, 2f
+ add x0, x0, #SDS_REGION_DESC_SIZE
+
+ /* Initialize the loop iterator count in w3 */
+ mov w3, #0
+loop_begin:
+ ldrh w2, [x0]
+ cmp w2, #SDS_AP_CPU_INFO_STRUCT_ID
+ b.ne continue_loop
+
+ /* We have found the required structure */
+ ldr w0, [x0,#(SDS_HEADER_SIZE + SDS_AP_CPU_INFO_PRIMARY_CPUID_OFFSET)]
+ ret
+continue_loop:
+ /* Increment the loop counter and exit loop if counter == structure count */
+ add w3, w3, #0x1
+ cmp w1, w3
+ b.eq 2f
+
+ /* Read the 2nd word in header */
+ ldr w2, [x0,#4]
+ /* Get the structure size from header */
+ ubfx x2, x2, #SDS_HEADER_STRUCT_SIZE_SHIFT, #SDS_HEADER_STRUCT_SIZE_WIDTH
+ /* Add the structure size and SDS HEADER SIZE to point to next header */
+ add x2, x2, #SDS_HEADER_SIZE
+ add x0, x0, x2
+ b loop_begin
+2:
+ mov w0, #0xffffffff
+ ret
+endfunc sds_get_primary_cpu_id