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https://github.com/AsahiLinux/u-boot
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ac0c1fda90
Override 'lowlevel_init' to make sure secondary CPUs trapped in ATF instead of SPL. After ATF is initialized, it will signal the secondary CPUs to jump from SPL to ATF waiting to be 'activated' by Linux OS via PSCI call. Signed-off-by: Chee Hong Ang <chee.hong.ang@intel.com>
76 lines
1.5 KiB
ArmAsm
76 lines
1.5 KiB
ArmAsm
/*
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* Copyright (C) 2020 Intel Corporation. All rights reserved
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <asm-offsets.h>
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/macro.h>
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ENTRY(lowlevel_init)
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mov x29, lr /* Save LR */
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#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
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#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_ATF)
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wait_for_atf:
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ldr x4, =CPU_RELEASE_ADDR
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ldr x5, [x4]
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cbz x5, slave_wait_atf
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br x5
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slave_wait_atf:
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branch_if_slave x0, wait_for_atf
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#else
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branch_if_slave x0, 1f
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#endif
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ldr x0, =GICD_BASE
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bl gic_init_secure
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1:
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#if defined(CONFIG_GICV3)
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ldr x0, =GICR_BASE
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bl gic_init_secure_percpu
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#elif defined(CONFIG_GICV2)
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ldr x0, =GICD_BASE
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ldr x1, =GICC_BASE
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bl gic_init_secure_percpu
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#endif
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#endif
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#ifdef CONFIG_ARMV8_MULTIENTRY
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branch_if_master x0, x1, 2f
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/*
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* Slave should wait for master clearing spin table.
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* This sync prevent slaves observing incorrect
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* value of spin table and jumping to wrong place.
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*/
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#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
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#ifdef CONFIG_GICV2
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ldr x0, =GICC_BASE
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#endif
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bl gic_wait_for_interrupt
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#endif
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/*
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* All slaves will enter EL2 and optionally EL1.
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*/
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adr x4, lowlevel_in_el2
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ldr x5, =ES_TO_AARCH64
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bl armv8_switch_to_el2
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lowlevel_in_el2:
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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adr x4, lowlevel_in_el1
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ldr x5, =ES_TO_AARCH64
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bl armv8_switch_to_el1
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lowlevel_in_el1:
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#endif
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#endif /* CONFIG_ARMV8_MULTIENTRY */
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2:
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mov lr, x29 /* Restore LR */
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ret
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ENDPROC(lowlevel_init)
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