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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 CPU ID from SDS Structure
* Returns CPUID on success or -1 on failure
*/
func sds_get_primary_cpu_id
ldr r0, =PLAT_ARM_SDS_MEM_BASE
ldr r2, =SDS_REGION_SIGNATURE
ldr r1, [r0]
ubfx r3, r1, #0, #16
/* Check if the SDS region signature found */
cmp r2, r3
bne 2f
/* Get the structure count from region descriptor in r1 */
ubfx r1, r1, #SDS_REGION_STRUCT_COUNT_SHIFT, #SDS_REGION_STRUCT_COUNT_WIDTH
cmp r1, #0
beq 2f
add r0, r0, #SDS_REGION_DESC_SIZE
/* Initialize the loop iterator count in r3 */
mov r3, #0
loop_begin:
ldrh r2, [r0]
cmp r2, #SDS_AP_CPU_INFO_STRUCT_ID
bne continue_loop
/* We have found the required structure */
ldr r0, [r0,#(SDS_HEADER_SIZE + SDS_AP_CPU_INFO_PRIMARY_CPUID_OFFSET)]
bx lr
continue_loop:
/* Increment the loop counter and exit loop if counter == structure count */
add r3, r3, #0x1
cmp r1, r3
beq 2f
/* Read the 2nd word in header */
ldr r2, [r0,#4]
/* Get the structure size from header */
ubfx r2, r2, #SDS_HEADER_STRUCT_SIZE_SHIFT, #SDS_HEADER_STRUCT_SIZE_WIDTH
/* Add the structure size and SDS HEADER SIZE to point to next header */
add r2, r2, #SDS_HEADER_SIZE
add r0, r0, r2
b loop_begin
2:
mov r0, #0xffffffff
bx lr
endfunc sds_get_primary_cpu_id
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