sh: Split out MMUCR.URB based entry wiring in to shared helper.

Presently this is duplicated between tlb-sh4 and tlb-pteaex. Split the
helpers out in to a generic tlb-urb that can be used by any parts
equipped with MMUCR.URB.

At the same time, move the SH-5 code out-of-line, as we require single
global state for DTLB entry wiring.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/sh/mm/tlb-sh5.c b/arch/sh/mm/tlb-sh5.c
index fdb64e41ec5..f27dbe1c159 100644
--- a/arch/sh/mm/tlb-sh5.c
+++ b/arch/sh/mm/tlb-sh5.c
@@ -143,3 +143,42 @@ void sh64_setup_tlb_slot(unsigned long long config_addr, unsigned long eaddr,
  */
 void sh64_teardown_tlb_slot(unsigned long long config_addr)
         __attribute__ ((alias("__flush_tlb_slot")));
+
+static int dtlb_entry;
+static unsigned long long dtlb_entries[64];
+
+void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
+{
+        unsigned long long entry;
+        unsigned long paddr, flags;
+
+        BUG_ON(dtlb_entry == ARRAY_SIZE(dtlb_entries));
+
+        local_irq_save(flags);
+
+        entry = sh64_get_wired_dtlb_entry();
+        dtlb_entries[dtlb_entry++] = entry;
+
+        paddr = pte_val(pte) & _PAGE_FLAGS_HARDWARE_MASK;
+        paddr &= ~PAGE_MASK;
+
+        sh64_setup_tlb_slot(entry, addr, get_asid(), paddr);
+
+        local_irq_restore(flags);
+}
+
+void tlb_unwire_entry(void)
+{
+        unsigned long long entry;
+        unsigned long flags;
+
+        BUG_ON(!dtlb_entry);
+
+        local_irq_save(flags);
+        entry = dtlb_entries[dtlb_entry--];
+
+        sh64_teardown_tlb_slot(entry);
+        sh64_put_wired_dtlb_entry(entry);
+
+        local_irq_restore(flags);
+}