mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 13:22:23 +00:00
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
/*
|
|
* CPU reset routines
|
|
*
|
|
* Copyright (C) 2015 Huawei Futurewei Technologies.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef _ARM64_CPU_RESET_H
|
|
#define _ARM64_CPU_RESET_H
|
|
|
|
#include <asm/virt.h>
|
|
|
|
void __cpu_soft_restart(unsigned long el2_switch, unsigned long entry,
|
|
unsigned long arg0, unsigned long arg1, unsigned long arg2);
|
|
|
|
static inline void __noreturn cpu_soft_restart(unsigned long el2_switch,
|
|
unsigned long entry, unsigned long arg0, unsigned long arg1,
|
|
unsigned long arg2)
|
|
{
|
|
typeof(__cpu_soft_restart) *restart;
|
|
|
|
el2_switch = el2_switch && !is_kernel_in_hyp_mode() &&
|
|
is_hyp_mode_available();
|
|
restart = (void *)virt_to_phys(__cpu_soft_restart);
|
|
|
|
cpu_install_idmap();
|
|
restart(el2_switch, entry, arg0, arg1, arg2);
|
|
unreachable();
|
|
}
|
|
|
|
#endif
|