1 /*
2  * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <assert.h>
8 
9 #include <plat/arm/common/plat_arm.h>
10 #include <plat/common/platform.h>
11 
12 #if ARM_PLAT_MT
13 #pragma weak plat_arm_get_cpu_pe_count
14 #endif
15 
16 /******************************************************************************
17  * This function implements a part of the critical interface between the psci
18  * generic layer and the platform that allows the former to query the platform
19  * to convert an MPIDR to a unique linear index. An error code (-1) is
20  * returned in case the MPIDR is invalid.
21  *****************************************************************************/
plat_core_pos_by_mpidr(u_register_t mpidr)22 int plat_core_pos_by_mpidr(u_register_t mpidr)
23 {
24 	if (arm_check_mpidr(mpidr) == 0) {
25 #if ARM_PLAT_MT
26 		assert((read_mpidr_el1() & MPIDR_MT_MASK) != 0);
27 
28 		/*
29 		 * The DTB files don't provide the MT bit in the mpidr argument
30 		 * so set it manually before calculating core position
31 		 */
32 		mpidr |= MPIDR_MT_MASK;
33 #endif
34 		return plat_arm_calc_core_pos(mpidr);
35 	}
36 	return -1;
37 }
38 
39 #if ARM_PLAT_MT
40 /******************************************************************************
41  * This function returns the PE count within the physical cpu corresponding to
42  * `mpidr`. Now one cpu only have one thread, so just return 1.
43  *****************************************************************************/
plat_arm_get_cpu_pe_count(u_register_t mpidr)44 unsigned int plat_arm_get_cpu_pe_count(u_register_t mpidr)
45 {
46 	return 1;
47 }
48 #endif /* ARM_PLAT_MT */
49