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authorPaul Mundt <lethal@linux-sh.org>2010-01-18 20:42:39 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-01-18 20:42:39 +0900
commit8faba6121566248330e738d25a2c43d7500fb9f0 (patch)
tree9cb09b2ec00b504dd24e1272126a22cd365e7282 /arch/sh/mm/tlb-sh4.c
parent4291b730cd0f0cf98a90d946b6cabbd804397350 (diff)
parent78bf04fc96f509474c6b443b515d6b79bb7bf584 (diff)
Merge branch 'sh/ioremap-fixed'
Diffstat (limited to 'arch/sh/mm/tlb-sh4.c')
-rw-r--r--arch/sh/mm/tlb-sh4.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 8cf550e2570f..4c6234743318 100644
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -81,3 +81,69 @@ void __uses_jump_to_uncached local_flush_tlb_one(unsigned long asid,
ctrl_outl(data, addr);
back_to_cached();
}
+
+/*
+ * Load the entry for 'addr' into the TLB and wire the entry.
+ */
+void tlb_wire_entry(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
+{
+ unsigned long status, flags;
+ int urb;
+
+ local_irq_save(flags);
+
+ /* Load the entry into the TLB */
+ __update_tlb(vma, addr, pte);
+
+ /* ... and wire it up. */
+ status = ctrl_inl(MMUCR);
+ urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
+ status &= ~MMUCR_URB;
+
+ /*
+ * Make sure we're not trying to wire the last TLB entry slot.
+ */
+ BUG_ON(!--urb);
+
+ urb = urb % MMUCR_URB_NENTRIES;
+
+ status |= (urb << MMUCR_URB_SHIFT);
+ ctrl_outl(status, MMUCR);
+ ctrl_barrier();
+
+ local_irq_restore(flags);
+}
+
+/*
+ * Unwire the last wired TLB entry.
+ *
+ * It should also be noted that it is not possible to wire and unwire
+ * TLB entries in an arbitrary order. If you wire TLB entry N, followed
+ * by entry N+1, you must unwire entry N+1 first, then entry N. In this
+ * respect, it works like a stack or LIFO queue.
+ */
+void tlb_unwire_entry(void)
+{
+ unsigned long status, flags;
+ int urb;
+
+ local_irq_save(flags);
+
+ status = ctrl_inl(MMUCR);
+ urb = (status & MMUCR_URB) >> MMUCR_URB_SHIFT;
+ status &= ~MMUCR_URB;
+
+ /*
+ * Make sure we're not trying to unwire a TLB entry when none
+ * have been wired.
+ */
+ BUG_ON(urb++ == MMUCR_URB_NENTRIES);
+
+ urb = urb % MMUCR_URB_NENTRIES;
+
+ status |= (urb << MMUCR_URB_SHIFT);
+ ctrl_outl(status, MMUCR);
+ ctrl_barrier();
+
+ local_irq_restore(flags);
+}