Linux-2.6.12-rc2v2.6.12-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!

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 000000000000..90ca99d0b89c
--- /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();
+}