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f9076ecfb1
Commit 68234df4ea ("arm64: kill flush_cache_all()") removed the global
arm64 routines cpu_reset() and cpu_soft_restart() needed by the arm64
kexec and kdump support. Add back a simplified version of
cpu_soft_restart() with some changes needed for kexec in the new files
cpu_reset.S, and cpu_reset.h.
When a CPU is reset it needs to be put into the exception level it had when
it entered the kernel. Update cpu_soft_restart() to accept an argument
which signals if the reset address should be entered at EL1 or EL2, and
add a new hypercall HVC_SOFT_RESTART which is used for the EL2 switch.
Signed-off-by: Geoff Levand <geoff@infradead.org>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
35 lines
917 B
C
35 lines
917 B
C
/*
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* CPU reset routines
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*
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* Copyright (C) 2015 Huawei Futurewei Technologies.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ARM64_CPU_RESET_H
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#define _ARM64_CPU_RESET_H
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#include <asm/virt.h>
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void __cpu_soft_restart(unsigned long el2_switch, unsigned long entry,
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unsigned long arg0, unsigned long arg1, unsigned long arg2);
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static inline void __noreturn cpu_soft_restart(unsigned long el2_switch,
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unsigned long entry, unsigned long arg0, unsigned long arg1,
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unsigned long arg2)
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{
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typeof(__cpu_soft_restart) *restart;
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el2_switch = el2_switch && !is_kernel_in_hyp_mode() &&
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is_hyp_mode_available();
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restart = (void *)virt_to_phys(__cpu_soft_restart);
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cpu_install_idmap();
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restart(el2_switch, entry, arg0, arg1, arg2);
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unreachable();
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}
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#endif
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