diff options
Diffstat (limited to 'arch/sparc/mm/generic_64.c')
| -rw-r--r-- | arch/sparc/mm/generic_64.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/sparc/mm/generic_64.c b/arch/sparc/mm/generic_64.c new file mode 100644 index 000000000000..f362c2037013 --- /dev/null +++ b/arch/sparc/mm/generic_64.c @@ -0,0 +1,163 @@ +/* + * 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/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; + + /* clear hack bit that was used as a write_combine side-effect flag */ + offset &= ~0x1UL; + address &= ~PMD_MASK; + end = address + size; + if (end > PMD_SIZE) + end = PMD_SIZE; + do { + pte_t entry; + unsigned long curend = address + PAGE_SIZE; + + entry = mk_pte_io(offset, prot, space, PAGE_SIZE); + if (!(address & 0xffff)) { + if (PAGE_SIZE < (4 * 1024 * 1024) && + !(address & 0x3fffff) && + !(offset & 0x3ffffe) && + end >= address + 0x400000) { + entry = mk_pte_io(offset, prot, space, + 4 * 1024 * 1024); + curend = address + 0x400000; + offset += 0x400000; + } else if (PAGE_SIZE < (512 * 1024) && + !(address & 0x7ffff) && + !(offset & 0x7fffe) && + end >= address + 0x80000) { + entry = mk_pte_io(offset, prot, space, + 512 * 1024 * 1024); + curend = address + 0x80000; + offset += 0x80000; + } else if (PAGE_SIZE < (64 * 1024) && + !(offset & 0xfffe) && + end >= address + 0x10000) { + entry = mk_pte_io(offset, prot, space, + 64 * 1024); + curend = address + 0x10000; + offset += 0x10000; + } else + offset += PAGE_SIZE; + } else + offset += PAGE_SIZE; + + if (pte_write(entry)) + entry = pte_mkdirty(entry); + do { + BUG_ON(!pte_none(*pte)); + set_pte_at(mm, address, pte, entry); + address += PAGE_SIZE; + pte_val(entry) += PAGE_SIZE; + pte++; + } while (address < curend); + } 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); + pte_unmap(pte); + address = (address + PMD_SIZE) & PMD_MASK; + pmd++; + } while (address < end); + return 0; +} + +static inline int io_remap_pud_range(struct mm_struct *mm, pud_t * pud, unsigned long address, unsigned long size, + unsigned long offset, pgprot_t prot, int space) +{ + unsigned long end; + + address &= ~PUD_MASK; + end = address + size; + if (end > PUD_SIZE) + end = PUD_SIZE; + offset -= address; + do { + pmd_t *pmd = pmd_alloc(mm, pud, address); + if (!pud) + return -ENOMEM; + io_remap_pmd_range(mm, pmd, address, end - address, address + offset, prot, space); + address = (address + PUD_SIZE) & PUD_MASK; + pud++; + } 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; + unsigned long phys_base; + + phys_base = offset | (((unsigned long) space) << 32UL); + + /* See comment in mm/memory.c remap_pfn_range */ + vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; + vma->vm_pgoff = phys_base >> PAGE_SHIFT; + + offset -= from; + dir = pgd_offset(mm, from); + flush_cache_range(vma, beg, end); + + while (from < end) { + pud_t *pud = pud_alloc(mm, dir, from); + error = -ENOMEM; + if (!pud) + break; + error = io_remap_pud_range(mm, pud, 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; +} |