MN10300: Make the use of PIDR to mark TLB entries controllable

Make controllable the use of the PIDR register to mark TLB entries as belonging
to particular processes.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 40 insertions, 3 deletions

diff --git a/arch/mn10300/include/asm/tlbflush.h b/arch/mn10300/include/asm/tlbflush.h
index 5d54bf57e6c3..c3c194d4031e 100644
--- a/arch/mn10300/include/asm/tlbflush.h
+++ b/arch/mn10300/include/asm/tlbflush.h
@@ -13,6 +13,12 @@
 
 #include <asm/processor.h>
 
+struct tlb_state {
+        struct mm_struct        *active_mm;
+        int                     state;
+};
+DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
+
 /**
  * local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
  */
@@ -31,20 +37,51 @@ static inline void local_flush_tlb(void)
 /**
  * local_flush_tlb_all - Flush all entries from the local CPU's TLBs
  */
-#define local_flush_tlb_all()           local_flush_tlb()
+static inline void local_flush_tlb_all(void)
+{
+        local_flush_tlb();
+}
 
 /**
  * local_flush_tlb_one - Flush one entry from the local CPU's TLBs
  */
-#define local_flush_tlb_one(addr)       local_flush_tlb()
+static inline void local_flush_tlb_one(unsigned long addr)
+{
+        local_flush_tlb();
+}
 
 /**
  * local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
  * @mm: The MM to flush for
  * @addr: The address of the target page in RAM (not its page struct)
  */
-extern void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr);
+static inline
+void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
+{
+        unsigned long pteu, flags, cnx;
+
+        addr &= PAGE_MASK;
 
+        local_irq_save(flags);
+
+        cnx = 1;
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+        cnx = mm->context.tlbpid[smp_processor_id()];
+#endif
+        if (cnx) {
+                pteu = addr;
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+                pteu |= cnx & xPTEU_PID;
+#endif
+                IPTEU = pteu;
+                DPTEU = pteu;
+                if (IPTEL & xPTEL_V)
+                        IPTEL = 0;
+                if (DPTEL & xPTEL_V)
+                        DPTEL = 0;
+        }
+        local_irq_restore(flags);
+}
 
 /*
  * TLB flushing: