1 files changed, 26 insertions, 0 deletions

diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index 296ad2eaddb0..cda5ea3157a7 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -1,8 +1,12 @@
 #include <linux/kernel.h>
 
 #include <asm/cputype.h>
+#include <asm/idmap.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
+#include <asm/sections.h>
+
+pgd_t *idmap_pgd;
 
 static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
         unsigned long prot)
@@ -73,6 +77,28 @@ void identity_mapping_del(pgd_t *pgd, unsigned long addr, unsigned long end)
 }
 #endif
 
+extern char  __idmap_text_start[], __idmap_text_end[];
+
+static int __init init_static_idmap(void)
+{
+        phys_addr_t idmap_start, idmap_end;
+
+        idmap_pgd = pgd_alloc(&init_mm);
+        if (!idmap_pgd)
+                return -ENOMEM;
+
+        /* Add an identity mapping for the physical address of the section. */
+        idmap_start = virt_to_phys((void *)__idmap_text_start);
+        idmap_end = virt_to_phys((void *)__idmap_text_end);
+
+        pr_info("Setting up static identity map for 0x%llx - 0x%llx\n",
+                (long long)idmap_start, (long long)idmap_end);
+        identity_mapping_add(idmap_pgd, idmap_start, idmap_end);
+
+        return 0;
+}
+arch_initcall(init_static_idmap);
+
 /*
  * In order to soft-boot, we need to insert a 1:1 mapping in place of
  * the user-mode pages.  This will then ensure that we have predictable