diff options
| -rw-r--r-- | arch/mips/mm/highmem.c | 19 | ||||
| -rw-r--r-- | include/asm-mips/highmem.h | 2 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index dd5e2e31885..1f7b37b38f5 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 f49930d947d..8cf59840249 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 |