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-rw-r--r--arch/x86/include/asm/iomap.h3
-rw-r--r--arch/x86/mm/iomap_32.c18
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/include/asm/iomap.h b/arch/x86/include/asm/iomap.h
index c1f06289b14..86af26091d6 100644
--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -23,6 +23,9 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size);
+
void *
iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index ca53224fc56..6c2b1af1692 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -20,6 +20,24 @@
#include <asm/pat.h>
#include <linux/module.h>
+#ifdef CONFIG_X86_PAE
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+ return 1;
+}
+#else
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+ /* There is no way to map greater than 1 << 32 address without PAE */
+ if (base + size > 0x100000000ULL)
+ return 0;
+
+ return 1;
+}
+#endif
+
/* Map 'pfn' using fixed map 'type' and protections 'prot'
*/
void *