1/* $Id: generic.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $ 2 * generic.c: Generic Sparc mm routines that are not dependent upon 3 * MMU type but are Sparc specific. 4 * 5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 6 */ 7 8#include <linux/kernel.h> 9#include <linux/mm.h> 10#include <linux/swap.h> 11#include <linux/pagemap.h> 12 13#include <asm/pgalloc.h> 14#include <asm/pgtable.h> 15#include <asm/page.h> 16#include <asm/cacheflush.h> 17#include <asm/tlbflush.h> 18 19/* Remap IO memory, the same way as remap_pfn_range(), but use 20 * the obio memory space. 21 * 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. 24 */ 25static 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) 27{ 28 unsigned long end; 29 30 address &= ~PMD_MASK; 31 end = address + size; 32 if (end > PMD_SIZE) 33 end = PMD_SIZE; 34 do { 35 set_pte_at(mm, address, pte, mk_pte_io(offset, prot, space)); 36 address += PAGE_SIZE; 37 offset += PAGE_SIZE; 38 pte++; 39 } while (address < end); 40} 41 42static 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) 44{ 45 unsigned long end; 46 47 address &= ~PGDIR_MASK; 48 end = address + size; 49 if (end > PGDIR_SIZE) 50 end = PGDIR_SIZE; 51 offset -= address; 52 do { 53 pte_t * pte = pte_alloc_map(mm, pmd, address); 54 if (!pte) 55 return -ENOMEM; 56 io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); 57 address = (address + PMD_SIZE) & PMD_MASK; 58 pmd++; 59 } while (address < end); 60 return 0; 61} 62 63int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, 64 unsigned long pfn, unsigned long size, pgprot_t prot) 65{ 66 int error = 0; 67 pgd_t * dir; 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; 73 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); 78 79 offset -= from; 80 dir = pgd_offset(mm, from); 81 flush_cache_range(vma, beg, end); 82 83 while (from < end) { 84 pmd_t *pmd = pmd_alloc(mm, dir, from); 85 error = -ENOMEM; 86 if (!pmd) 87 break; 88 error = io_remap_pmd_range(mm, pmd, from, end - from, offset + from, prot, space); 89 if (error) 90 break; 91 from = (from + PGDIR_SIZE) & PGDIR_MASK; 92 dir++; 93 } 94 95 flush_tlb_range(vma, beg, end); 96 return error; 97} 98