50 lines
1.3 KiB
ArmAsm
50 lines
1.3 KiB
ArmAsm
/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <platform_def.h>
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.globl plat_is_my_cpu_primary
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.globl plat_arm_calc_core_pos
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/* -----------------------------------------------------
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* unsigned int plat_is_my_cpu_primary (void);
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*
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* Find out whether the current cpu is the primary
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* cpu (applicable only after a cold boot)
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* -----------------------------------------------------
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*/
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func plat_is_my_cpu_primary
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mov x9, x30
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bl plat_my_core_pos
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ldr x1, =SGI_BOOT_CFG_ADDR
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ldr x1, [x1]
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ubfx x1, x1, #PLAT_CSS_PRIMARY_CPU_SHIFT, \
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#PLAT_CSS_PRIMARY_CPU_BIT_WIDTH
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cmp x0, x1
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cset w0, eq
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ret x9
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endfunc plat_is_my_cpu_primary
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/* -----------------------------------------------------
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* unsigned int plat_arm_calc_core_pos(uint64_t mpidr)
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* Helper function to calculate the core position.
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* -----------------------------------------------------
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*/
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func plat_arm_calc_core_pos
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mrs x2, mpidr_el1
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ands x2, x2, #MPIDR_MT_MASK
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beq 1f
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lsr x0, x0, #MPIDR_AFF1_SHIFT
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1:
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and x1, x0, #MPIDR_CPU_MASK
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and x0, x0, #MPIDR_CLUSTER_MASK
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add x0, x1, x0, LSR #6
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and x0, x0, #MPIDR_AFFLVL_MASK
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ret
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endfunc plat_arm_calc_core_pos
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