| /* |
| * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <platform_def.h> |
| #include "../sds.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 |
