summaryrefslogtreecommitdiffstats
path: root/arch/sparc/mm/generic_64.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/mm/generic_64.c')
-rw-r--r--arch/sparc/mm/generic_64.c163
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 00000000000..f362c203701
--- /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;
+}