From: Geoff Levand <ge...@infradead.org>
Add the setup_mm_for_reboot() function needed for kexec.
Signed-off-by: Geoff Levand <ge...@infradead.org>
---
arch/arm64/include/asm/mmu.h | 1 -
arch/arm64/mm/mmu.c | 11 +++++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
index 3d31176..99064c0 100644
--- a/arch/arm64/include/asm/mmu.h
+++ b/arch/arm64/include/asm/mmu.h
@@ -28,7 +28,6 @@ typedef struct {
#define ASID(mm) ((mm)->context.id & 0xffff)
extern void paging_init(void);
-extern void setup_mm_for_reboot(void);
extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
extern void init_mem_pgprot(void);
extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index cb34eb8..adf2f08 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -474,6 +474,17 @@ void setup_mm_for_reboot(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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