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-rw-r--r--arch/mips/mm/highmem.c19
-rw-r--r--include/asm-mips/highmem.h2
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index dd5e2e31885b..1f7b37b38f5c 100644
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -83,6 +83,25 @@ void __kunmap_atomic(void *kvaddr, enum km_type type)
preempt_check_resched();
}
+/*
+ * This is the same as kmap_atomic() but can map memory that doesn't
+ * have a struct page associated with it.
+ */
+void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)
+{
+ enum fixed_addresses idx;
+ unsigned long vaddr;
+
+ inc_preempt_count();
+
+ idx = type + KM_TYPE_NR*smp_processor_id();
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+ set_pte(kmap_pte-idx, pfn_pte(pfn, kmap_prot));
+ flush_tlb_one(vaddr);
+
+ return (void*) vaddr;
+}
+
struct page *__kmap_atomic_to_page(void *ptr)
{
unsigned long idx, vaddr = (unsigned long)ptr;
diff --git a/include/asm-mips/highmem.h b/include/asm-mips/highmem.h
index f49930d947d4..8cf598402492 100644
--- a/include/asm-mips/highmem.h
+++ b/include/asm-mips/highmem.h
@@ -75,6 +75,7 @@ static inline void *kmap_atomic(struct page *page, enum km_type type)
}
static inline void kunmap_atomic(void *kvaddr, enum km_type type) { }
+#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
@@ -86,6 +87,7 @@ extern void *__kmap(struct page *page);
extern void __kunmap(struct page *page);
extern void *__kmap_atomic(struct page *page, enum km_type type);
extern void __kunmap_atomic(void *kvaddr, enum km_type type);
+extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type);
extern struct page *__kmap_atomic_to_page(void *ptr);
#define kmap __kmap
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