1 files changed, 97 insertions, 0 deletions

diff --git a/arch/tile/kernel/tlb.c b/arch/tile/kernel/tlb.c
new file mode 100644
index 000000000000..2dffc1044d83
--- /dev/null
+++ b/arch/tile/kernel/tlb.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ *
+ */
+
+#include <linux/cpumask.h>
+#include <linux/module.h>
+#include <asm/tlbflush.h>
+#include <asm/homecache.h>
+#include <hv/hypervisor.h>
+
+/* From tlbflush.h */
+DEFINE_PER_CPU(int, current_asid);
+int min_asid, max_asid;
+
+/*
+ * Note that we flush the L1I (for VM_EXEC pages) as well as the TLB
+ * so that when we are unmapping an executable page, we also flush it.
+ * Combined with flushing the L1I at context switch time, this means
+ * we don't have to do any other icache flushes.
+ */
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+        HV_Remote_ASID asids[NR_CPUS];
+        int i = 0, cpu;
+        for_each_cpu(cpu, &mm->cpu_vm_mask) {
+                HV_Remote_ASID *asid = &asids[i++];
+                asid->y = cpu / smp_topology.width;
+                asid->x = cpu % smp_topology.width;
+                asid->asid = per_cpu(current_asid, cpu);
+        }
+        flush_remote(0, HV_FLUSH_EVICT_L1I, &mm->cpu_vm_mask,
+                     0, 0, 0, NULL, asids, i);
+}
+
+void flush_tlb_current_task(void)
+{
+        flush_tlb_mm(current->mm);
+}
+
+void flush_tlb_page_mm(const struct vm_area_struct *vma, struct mm_struct *mm,
+                       unsigned long va)
+{
+        unsigned long size = hv_page_size(vma);
+        int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
+        flush_remote(0, cache, &mm->cpu_vm_mask,
+                     va, size, size, &mm->cpu_vm_mask, NULL, 0);
+}
+
+void flush_tlb_page(const struct vm_area_struct *vma, unsigned long va)
+{
+        flush_tlb_page_mm(vma, vma->vm_mm, va);
+}
+EXPORT_SYMBOL(flush_tlb_page);
+
+void flush_tlb_range(const struct vm_area_struct *vma,
+                     unsigned long start, unsigned long end)
+{
+        unsigned long size = hv_page_size(vma);
+        struct mm_struct *mm = vma->vm_mm;
+        int cache = (vma->vm_flags & VM_EXEC) ? HV_FLUSH_EVICT_L1I : 0;
+        flush_remote(0, cache, &mm->cpu_vm_mask, start, end - start, size,
+                     &mm->cpu_vm_mask, NULL, 0);
+}
+
+void flush_tlb_all(void)
+{
+        int i;
+        for (i = 0; ; ++i) {
+                HV_VirtAddrRange r = hv_inquire_virtual(i);
+                if (r.size == 0)
+                        break;
+                flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
+                             r.start, r.size, PAGE_SIZE, cpu_online_mask,
+                             NULL, 0);
+                flush_remote(0, 0, NULL,
+                             r.start, r.size, HPAGE_SIZE, cpu_online_mask,
+                             NULL, 0);
+        }
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+        flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
+                     start, end - start, PAGE_SIZE, cpu_online_mask, NULL, 0);
+}