]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - arch/sparc/mm/generic_32.c
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>
13 #include <asm/pgalloc.h>
14 #include <asm/pgtable.h>
16 #include <asm/cacheflush.h>
17 #include <asm/tlbflush.h>
19 /* Remap IO memory, the same way as remap_pfn_range(), but use
20 * the obio memory space.
22 * They use a pgprot that sets PAGE_IO and does not check the
23 * mem_map table as this is independent of normal memory.
25 static inline void io_remap_pte_range(struct mm_struct
*mm
, pte_t
* pte
, unsigned long address
, unsigned long size
,
26 unsigned long offset
, pgprot_t prot
, int space
)
35 set_pte_at(mm
, address
, pte
, mk_pte_io(offset
, prot
, space
));
39 } while (address
< end
);
42 static inline int io_remap_pmd_range(struct mm_struct
*mm
, pmd_t
* pmd
, unsigned long address
, unsigned long size
,
43 unsigned long offset
, pgprot_t prot
, int space
)
47 address
&= ~PGDIR_MASK
;
53 pte_t
*pte
= pte_alloc_map(mm
, NULL
, pmd
, address
);
56 io_remap_pte_range(mm
, pte
, address
, end
- address
, address
+ offset
, prot
, space
);
57 address
= (address
+ PMD_SIZE
) & PMD_MASK
;
59 } while (address
< end
);
63 int io_remap_pfn_range(struct vm_area_struct
*vma
, unsigned long from
,
64 unsigned long pfn
, unsigned long size
, pgprot_t prot
)
68 unsigned long beg
= from
;
69 unsigned long end
= from
+ size
;
70 struct mm_struct
*mm
= vma
->vm_mm
;
71 int space
= GET_IOSPACE(pfn
);
72 unsigned long offset
= GET_PFN(pfn
) << PAGE_SHIFT
;
74 /* See comment in mm/memory.c remap_pfn_range */
75 vma
->vm_flags
|= VM_IO
| VM_RESERVED
| VM_PFNMAP
;
76 vma
->vm_pgoff
= (offset
>> PAGE_SHIFT
) |
77 ((unsigned long)space
<< 28UL);
80 dir
= pgd_offset(mm
, from
);
81 flush_cache_range(vma
, beg
, end
);
84 pmd_t
*pmd
= pmd_alloc(mm
, dir
, from
);
88 error
= io_remap_pmd_range(mm
, pmd
, from
, end
- from
, offset
+ from
, prot
, space
);
91 from
= (from
+ PGDIR_SIZE
) & PGDIR_MASK
;
95 flush_tlb_range(vma
, beg
, end
);
98 EXPORT_SYMBOL(io_remap_pfn_range
);