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;
+}