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/*
* 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
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