1 files changed, 97 insertions, 0 deletions

diff --git a/arch/sparc/mm/generic_32.c b/arch/sparc/mm/generic_32.c
new file mode 100644
index 000000000000..a289261da9fd
--- /dev/null
+++ b/arch/sparc/mm/generic_32.c
@@ -0,0 +1,97 @@
+/*
+ * 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;
+}