Linux-2.6.12-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!
diff --git a/arch/sparc64/mm/tlb.c b/arch/sparc64/mm/tlb.c
new file mode 100644
index 0000000..90ca99d
--- /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();
+}