2 * generic.c: Generic Sparc mm routines that are not dependent upon
3 * MMU type but are Sparc specific.
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
8 #include <linux/kernel.h>
10 #include <linux/swap.h>
11 #include <linux/pagemap.h>
12 #include <linux/export.h>
14 #include <asm/pgalloc.h>
15 #include <asm/pgtable.h>
17 #include <asm/cacheflush.h>
18 #include <asm/tlbflush.h>
20 /* Remap IO memory, the same way as remap_pfn_range(), but use
21 * the obio memory space.
23 * They use a pgprot that sets PAGE_IO and does not check the
24 * mem_map table as this is independent of normal memory.
26 static inline void io_remap_pte_range(struct mm_struct
*mm
, pte_t
* pte
, unsigned long address
, unsigned long size
,
27 unsigned long offset
, pgprot_t prot
, int space
)
36 set_pte_at(mm
, address
, pte
, mk_pte_io(offset
, prot
, space
));
40 } while (address
< end
);
43 static inline int io_remap_pmd_range(struct mm_struct
*mm
, pmd_t
* pmd
, unsigned long address
, unsigned long size
,
44 unsigned long offset
, pgprot_t prot
, int space
)
48 address
&= ~PGDIR_MASK
;
54 pte_t
*pte
= pte_alloc_map(mm
, NULL
, pmd
, address
);
57 io_remap_pte_range(mm
, pte
, address
, end
- address
, address
+ offset
, prot
, space
);
58 address
= (address
+ PMD_SIZE
) & PMD_MASK
;
60 } while (address
< end
);
64 int io_remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
,
65 unsigned long pfn
, unsigned long size
, pgprot_t prot
)
69 unsigned long beg
= from
;
70 unsigned long end
= from
+ size
;
71 struct mm_struct
*mm
= vma
->vm_mm
;
72 int space
= GET_IOSPACE(pfn
);
73 unsigned long offset
= GET_PFN(pfn
) << PAGE_SHIFT
;
75 /* See comment in mm/memory.c remap_pfn_range */
76 vma
->vm_flags
|= VM_IO
| VM_RESERVED
| VM_PFNMAP
;
77 vma
->vm_pgoff
= (offset
>> PAGE_SHIFT
) |
78 ((unsigned long)space
<< 28UL);
81 dir
= pgd_offset(mm
, from
);
82 flush_cache_range(vma
, beg
, end
);
85 pmd_t
*pmd
= pmd_alloc(mm
, dir
, from
);
89 error
= io_remap_pmd_range(mm
, pmd
, from
, end
- from
, offset
+ from
, prot
, space
);
92 from
= (from
+ PGDIR_SIZE
) & PGDIR_MASK
;
96 flush_tlb_range(vma
, beg
, end
);
99 EXPORT_SYMBOL(io_remap_pfn_range
);