/* $Id: generic.c,v 1.14 2001/12/21 04:56:15 davem Exp $ * generic.c: Generic Sparc mm routines that are not dependent upon * MMU type but are Sparc specific. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/pagemap.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> #include <asm/page.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> /* Remap IO memory, the same way as remap_pfn_range(), but use * the obio memory space. * * They use a pgprot that sets PAGE_IO and does not check the * mem_map table as this is independent of normal memory. */ static inline void io_remap_pte_range(struct mm_struct *mm, pte_t * pte, unsigned long address, unsigned long size, unsigned long offset, pgprot_t prot, int space) { unsigned long end; address &= ~PMD_MASK; end = address + size; if (end > PMD_SIZE) end = PMD_SIZE; do { set_pte_at(mm, address, pte, mk_pte_io(offset, prot, space)); address += PAGE_SIZE; offset += PAGE_SIZE; pte++; } while (address < end); } static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size, unsigned long offset, pgprot_t prot, int space) { unsigned long end; address &= ~PGDIR_MASK; end = address + size; if (end > PGDIR_SIZE) end = PGDIR_SIZE; offset -= address; do { pte_t * pte = pte_alloc_map(mm, pmd, address); if (!pte) return -ENOMEM; io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space); address = (address + PMD_SIZE) & PMD_MASK; pmd++; } while (address < end); return 0; } int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot) { int error = 0; pgd_t * dir; unsigned long beg = from; unsigned long end = from + size; struct mm_struct *mm = vma->vm_mm; int space = GET_IOSPACE(pfn); unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT; /* See comment in mm/memory.c remap_pfn_range */ vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; vma->vm_pgoff = (offset >> PAGE_SHIFT) | ((unsigned long)space << 28UL); offset -= from; dir = pgd_offset(mm, from); flush_cache_range(vma, beg, end); while (from < end) { pmd_t *pmd = pmd_alloc(mm, dir, from); error = -ENOMEM; if (!pmd) break; error = io_remap_pmd_range(mm, pmd, from, end - from, offset + from, prot, space); if (error) break; from = (from + PGDIR_SIZE) & PGDIR_MASK; dir++; } flush_tlb_range(vma, beg, end); return error; }