1 files changed, 151 insertions, 0 deletions
diff --git a/arch/sparc64/mm/tlb.c b/arch/sparc64/mm/tlb.c
new file mode 100644
index 00000000000..90ca99d0b89
--- /dev/null
+++ b/arch/sparc64/mm/tlb.c
@@ -0,0 +1,151 @@
+/* arch/sparc64/mm/tlb.c
+ *
+ * Copyright (C) 2004 David S. Miller <davem@redhat.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/percpu.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/mmu_context.h>
+#include <asm/tlb.h>
+
+/* Heavily inspired by the ppc64 code.  */
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers) =
+	{ NULL, 0, 0, 0, 0, 0, { 0 }, { NULL }, };
+
+void flush_tlb_pending(void)
+{
+	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
+
+	if (mp->tlb_nr) {
+		if (CTX_VALID(mp->mm->context)) {
+#ifdef CONFIG_SMP
+			smp_flush_tlb_pending(mp->mm, mp->tlb_nr,
+					      &mp->vaddrs[0]);
+#else
+			__flush_tlb_pending(CTX_HWBITS(mp->mm->context),
+					    mp->tlb_nr, &mp->vaddrs[0]);
+#endif
+		}
+		mp->tlb_nr = 0;
+	}
+}
+
+void tlb_batch_add(struct mm_struct *mm, unsigned long vaddr, pte_t *ptep, pte_t orig)
+{
+	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
+	unsigned long nr;
+
+	vaddr &= PAGE_MASK;
+	if (pte_exec(orig))
+		vaddr |= 0x1UL;
+
+	if (pte_dirty(orig)) {
+		unsigned long paddr, pfn = pte_pfn(orig);
+		struct address_space *mapping;
+		struct page *page;
+
+		if (!pfn_valid(pfn))
+			goto no_cache_flush;
+
+		page = pfn_to_page(pfn);
+		if (PageReserved(page))
+			goto no_cache_flush;
+
+		/* A real file page? */
+		mapping = page_mapping(page);
+		if (!mapping)
+			goto no_cache_flush;
+
+		paddr = (unsigned long) page_address(page);
+		if ((paddr ^ vaddr) & (1 << 13))
+			flush_dcache_page_all(mm, page);
+	}
+
+no_cache_flush:
+
+	if (mp->tlb_frozen)
+		return;
+
+	nr = mp->tlb_nr;
+
+	if (unlikely(nr != 0 && mm != mp->mm)) {
+		flush_tlb_pending();
+		nr = 0;
+	}
+
+	if (nr == 0)
+		mp->mm = mm;
+
+	mp->vaddrs[nr] = vaddr;
+	mp->tlb_nr = ++nr;
+	if (nr >= TLB_BATCH_NR)
+		flush_tlb_pending();
+}
+
+void flush_tlb_pgtables(struct mm_struct *mm, unsigned long start, unsigned long end)
+{
+	struct mmu_gather *mp = &__get_cpu_var(mmu_gathers);
+	unsigned long nr = mp->tlb_nr;
+	long s = start, e = end, vpte_base;
+
+	if (mp->tlb_frozen)
+		return;
+
+	/* If start is greater than end, that is a real problem.  */
+	BUG_ON(start > end);
+
+	/* However, straddling the VA space hole is quite normal. */
+	s &= PMD_MASK;
+	e = (e + PMD_SIZE - 1) & PMD_MASK;
+
+	vpte_base = (tlb_type == spitfire ?
+		     VPTE_BASE_SPITFIRE :
+		     VPTE_BASE_CHEETAH);
+
+	if (unlikely(nr != 0 && mm != mp->mm)) {
+		flush_tlb_pending();
+		nr = 0;
+	}
+
+	if (nr == 0)
+		mp->mm = mm;
+
+	start = vpte_base + (s >> (PAGE_SHIFT - 3));
+	end = vpte_base + (e >> (PAGE_SHIFT - 3));
+
+	/* If the request straddles the VA space hole, we
+	 * need to swap start and end.  The reason this
+	 * occurs is that "vpte_base" is the center of
+	 * the linear page table mapping area.  Thus,
+	 * high addresses with the sign bit set map to
+	 * addresses below vpte_base and non-sign bit
+	 * addresses map to addresses above vpte_base.
+	 */
+	if (end < start) {
+		unsigned long tmp = start;
+
+		start = end;
+		end = tmp;
+	}
+
+	while (start < end) {
+		mp->vaddrs[nr] = start;
+		mp->tlb_nr = ++nr;
+		if (nr >= TLB_BATCH_NR) {
+			flush_tlb_pending();
+			nr = 0;
+		}
+		start += PAGE_SIZE;
+	}
+	if (nr)
+		flush_tlb_pending();
+}