Define kmap_atomic_pfn() for MIPS.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index dd5e2e31885b8e0e87dab65344248e5ac46dc30a..1f7b37b38f5c740839208cf7f6728e3335fde7f0 100644 (file)
--- 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 f49930d947d45de56a3e9a7e74b1802499ec07de..8cf598402492c2d2394aeb0fc2add6f7f8f57724 100644 (file)
--- 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