From: John Jacques <john.jacq...@intel.com> Add the setup_mm_for_reboot() function needed for kexec.
Signed-off-by: Geoff Levand <ge...@infradead.org> Signed-off-by: John Jacques <john.jacq...@intel.com> Signed-off-by: Charlie Paul <charlie.p...@windriver.com> Signed-off-by: Daniel Dragomir <daniel.drago...@windriver.com> --- arch/arm64/mm/mmu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 0fa5581..755adcd 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -660,6 +660,17 @@ void __init paging_init(void) } /* + * Enable the identity mapping to allow the MMU disabling. + */ +void setup_mm_for_reboot(void) +{ + cpu_set_reserved_ttbr0(); + flush_tlb_all(); + cpu_set_idmap_tcr_t0sz(); + cpu_switch_mm(idmap_pg_dir, &init_mm); +} + +/* * Check whether a kernel address is valid (derived from arch/x86/). */ int kern_addr_valid(unsigned long addr) -- 2.7.4
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