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authorRichard Kuo <rkuo@codeaurora.org>2011-10-31 18:52:00 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-01 07:34:20 -0700
commit5df87c1556515dfae504da342990821f407a8c99 (patch)
tree9cd922340f301d0ab18cf3280b5c1c9f2df5e4cb /arch/hexagon/mm
parent2d3cbc780437ae4e81f09d0efdd6769852bce5f5 (diff)
downloadlinux-linaro-stable-5df87c1556515dfae504da342990821f407a8c99.tar.gz
Hexagon: Implement basic TLB management routines for Hexagon.
Mostly all stubs, as the TLB is managed by the hypervisor. Signed-off-by: Richard Kuo <rkuo@codeaurora.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon/mm')
-rw-r--r--arch/hexagon/mm/vm_tlb.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/arch/hexagon/mm/vm_tlb.c b/arch/hexagon/mm/vm_tlb.c
new file mode 100644
index 000000000000..c6ff41575461
--- /dev/null
+++ b/arch/hexagon/mm/vm_tlb.c
@@ -0,0 +1,93 @@
+/*
+ * Hexagon Virtual Machine TLB functions
+ *
+ * Copyright (c) 2010-2011, Code Aurora Forum. 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 version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/*
+ * The Hexagon Virtual Machine conceals the real workings of
+ * the TLB, but there are one or two functions that need to
+ * be instantiated for it, differently from a native build.
+ */
+#include <linux/mm.h>
+#include <asm/page.h>
+#include <asm/hexagon_vm.h>
+
+/*
+ * Initial VM implementation has only one map active at a time, with
+ * TLB purgings on changes. So either we're nuking the current map,
+ * or it's a no-op. This operation is messy on true SMPs where other
+ * processors must be induced to flush the copies in their local TLBs,
+ * but Hexagon thread-based virtual processors share the same MMU.
+ */
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
+
+ if (mm->context.ptbase == current->active_mm->context.ptbase)
+ __vmclrmap((void *)start, end - start);
+}
+
+/*
+ * Flush a page from the kernel virtual map - used by highmem
+ */
+void flush_tlb_one(unsigned long vaddr)
+{
+ __vmclrmap((void *)vaddr, PAGE_SIZE);
+}
+
+/*
+ * Flush all TLBs across all CPUs, virtual or real.
+ * A single Hexagon core has 6 thread contexts but
+ * only one TLB.
+ */
+void tlb_flush_all(void)
+{
+ /* should probably use that fixaddr end or whateve label */
+ __vmclrmap(0, 0xffff0000);
+}
+
+/*
+ * Flush TLB entries associated with a given mm_struct mapping.
+ */
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ /* Current Virtual Machine has only one map active at a time */
+ if (current->active_mm->context.ptbase == mm->context.ptbase)
+ tlb_flush_all();
+}
+
+/*
+ * Flush TLB state associated with a page of a vma.
+ */
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
+{
+ struct mm_struct *mm = vma->vm_mm;
+
+ if (mm->context.ptbase == current->active_mm->context.ptbase)
+ __vmclrmap((void *)vaddr, PAGE_SIZE);
+}
+
+/*
+ * Flush TLB entries associated with a kernel address range.
+ * Like flush range, but without the check on the vma->vm_mm.
+ */
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+ __vmclrmap((void *)start, end - start);
+}