From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/sparc/mm/generic.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+) create mode 100644 arch/sparc/mm/generic.c (limited to 'arch/sparc/mm/generic.c') diff --git a/arch/sparc/mm/generic.c b/arch/sparc/mm/generic.c new file mode 100644 index 000000000000..db27eee3bda1 --- /dev/null +++ b/arch/sparc/mm/generic.c @@ -0,0 +1,154 @@ +/* $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 +#include +#include +#include + +#include +#include +#include +#include +#include + +static inline void forget_pte(pte_t page) +{ +#if 0 /* old 2.4 code */ + if (pte_none(page)) + return; + if (pte_present(page)) { + unsigned long pfn = pte_pfn(page); + struct page *ptpage; + if (!pfn_valid(pfn)) + return; + ptpage = pfn_to_page(pfn); + if (PageReserved(ptpage)) + return; + page_cache_release(ptpage); + return; + } + swap_free(pte_to_swp_entry(page)); +#else + if (!pte_none(page)) { + printk("forget_pte: old mapping existed!\n"); + BUG(); + } +#endif +} + +/* 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 { + pte_t oldpage = *pte; + pte_clear(mm, address, pte); + set_pte(pte, mk_pte_io(offset, prot, space)); + forget_pte(oldpage); + 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_page_range(struct vm_area_struct *vma, unsigned long from, unsigned long offset, unsigned long size, pgprot_t prot, int space) +{ + int error = 0; + pgd_t * dir; + unsigned long beg = from; + unsigned long end = from + size; + struct mm_struct *mm = vma->vm_mm; + + prot = __pgprot(pg_iobits); + offset -= from; + dir = pgd_offset(mm, from); + flush_cache_range(vma, beg, end); + + spin_lock(&mm->page_table_lock); + while (from < end) { + pmd_t *pmd = pmd_alloc(current->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++; + } + spin_unlock(&mm->page_table_lock); + + flush_tlb_range(vma, beg, end); + return error; +} + +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; + + prot = __pgprot(pg_iobits); + offset -= from; + dir = pgd_offset(mm, from); + flush_cache_range(vma, beg, end); + + spin_lock(&mm->page_table_lock); + while (from < end) { + pmd_t *pmd = pmd_alloc(current->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++; + } + spin_unlock(&mm->page_table_lock); + + flush_tlb_range(vma, beg, end); + return error; +} -- cgit v1.2.2