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c367b75e85
Since BL31 PROGBITS and BL31 NOBITS sections are going to be in non-adjacent memory regions, potentially far from each other, some fixes are needed to support it completely. 1. adr instruction only allows computing the effective address of a location only within 1MB range of the PC. However, adrp instruction together with an add permits position independent address of any location with 4GB range of PC. 2. Since BL31 _RW_END_ marks the end of BL31 image, care must be taken that it is aligned to page size since we map this memory region in BL31 using xlat_v2 lib utils which mandate alignment of image size to page granularity. Change-Id: I3451cc030d03cb2032db3cc088f0c0e2c84bffda Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
48 lines
1.3 KiB
ArmAsm
48 lines
1.3 KiB
ArmAsm
/*
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* Copyright (c) 2014-2020, 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 <asm_macros.S>
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#include <lib/el3_runtime/cpu_data.h>
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.globl init_cpu_data_ptr
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.globl _cpu_data_by_index
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/* -----------------------------------------------------------------
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* void init_cpu_data_ptr(void)
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*
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* Initialise the TPIDR_EL3 register to refer to the cpu_data_t
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* for the calling CPU. This must be called before cm_get_cpu_data()
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*
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* This can be called without a valid stack. It assumes that
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* plat_my_core_pos() does not clobber register x10.
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* clobbers: x0, x1, x10
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* -----------------------------------------------------------------
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*/
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func init_cpu_data_ptr
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mov x10, x30
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bl plat_my_core_pos
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bl _cpu_data_by_index
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msr tpidr_el3, x0
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ret x10
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endfunc init_cpu_data_ptr
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/* -----------------------------------------------------------------
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* cpu_data_t *_cpu_data_by_index(uint32_t cpu_index)
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*
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* Return the cpu_data structure for the CPU with given linear index
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*
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* This can be called without a valid stack.
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* clobbers: x0, x1
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* -----------------------------------------------------------------
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*/
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func _cpu_data_by_index
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mov_imm x1, CPU_DATA_SIZE
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mul x0, x0, x1
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adrp x1, percpu_data
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add x1, x1, :lo12:percpu_data
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add x0, x0, x1
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ret
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endfunc _cpu_data_by_index
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