From 4539282dbc20fe612113c8f267d51a90d46a7f50 Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt@console-pimps.org>
Date: Fri, 26 Mar 2010 11:37:16 +0900
Subject: sh: update the TLB replacement counter for entry wiring.

Presently the TLB wiring code depends on MMUCR.URB for working out where
to place the wired entry, but fails to take the replacment counter in to
consideration. This fixes up the wiring logic and ensures that wired
entries remain so.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/include/cpu-sh4/cpu/mmu_context.h b/arch/sh/include/cpu-sh4/cpu/mmu_context.h
index 310ec92..5963124 100644
--- a/arch/sh/include/cpu-sh4/cpu/mmu_context.h
+++ b/arch/sh/include/cpu-sh4/cpu/mmu_context.h
@@ -30,6 +30,8 @@
 #define MMUCR_URB		0x00FC0000
 #define MMUCR_URB_SHIFT		18
 #define MMUCR_URB_NENTRIES	64
+#define MMUCR_URC		0x0000FC00
+#define MMUCR_URC_SHIFT		10
 
 #if defined(CONFIG_32BIT) && defined(CONFIG_CPU_SUBTYPE_ST40)
 #define MMUCR_SE		(1 << 4)
diff --git a/arch/sh/mm/tlb-urb.c b/arch/sh/mm/tlb-urb.c
index bb5b909..c92ce20 100644
--- a/arch/sh/mm/tlb-urb.c
+++ b/arch/sh/mm/tlb-urb.c
@@ -24,13 +24,9 @@ void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
 
 	local_irq_save(flags);
 
-	/* Load the entry into the TLB */
-	__update_tlb(vma, addr, pte);
-
-	/* ... and wire it up. */
 	status = __raw_readl(MMUCR);
 	urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
-	status &= ~MMUCR_URB;
+	status &= ~MMUCR_URC;
 
 	/*
 	 * Make sure we're not trying to wire the last TLB entry slot.
@@ -39,7 +35,23 @@ void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
 
 	urb = urb % MMUCR_URB_NENTRIES;
 
+	/*
+	 * Insert this entry into the highest non-wired TLB slot (via
+	 * the URC field).
+	 */
+	status |= (urb << MMUCR_URC_SHIFT);
+	__raw_writel(status, MMUCR);
+	ctrl_barrier();
+
+	/* Load the entry into the TLB */
+	__update_tlb(vma, addr, pte);
+
+	/* ... and wire it up. */
+	status = __raw_readl(MMUCR);
+
+	status &= ~MMUCR_URB;
 	status |= (urb << MMUCR_URB_SHIFT);
+
 	__raw_writel(status, MMUCR);
 	ctrl_barrier();
 
-- 
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