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);