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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