1 files changed, 140 insertions, 0 deletions

diff --git a/arch/tile/include/asm/cacheflush.h b/arch/tile/include/asm/cacheflush.h
new file mode 100644
index 00000000000..c5741da4eea
--- /dev/null
+++ b/arch/tile/include/asm/cacheflush.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2010 Tilera Corporation. 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
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   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, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _ASM_TILE_CACHEFLUSH_H
+#define _ASM_TILE_CACHEFLUSH_H
+
+#include <arch/chip.h>
+
+/* Keep includes the same across arches.  */
+#include <linux/mm.h>
+#include <linux/cache.h>
+#include <asm/system.h>
+#include <arch/icache.h>
+
+/* Caches are physically-indexed and so don't need special treatment */
+#define flush_cache_all()                       do { } while (0)
+#define flush_cache_mm(mm)                      do { } while (0)
+#define flush_cache_dup_mm(mm)                  do { } while (0)
+#define flush_cache_range(vma, start, end)      do { } while (0)
+#define flush_cache_page(vma, vmaddr, pfn)      do { } while (0)
+#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
+#define flush_dcache_page(page)                 do { } while (0)
+#define flush_dcache_mmap_lock(mapping)         do { } while (0)
+#define flush_dcache_mmap_unlock(mapping)       do { } while (0)
+#define flush_cache_vmap(start, end)            do { } while (0)
+#define flush_cache_vunmap(start, end)          do { } while (0)
+#define flush_icache_page(vma, pg)              do { } while (0)
+#define flush_icache_user_range(vma, pg, adr, len)      do { } while (0)
+
+/* Flush the icache just on this cpu */
+extern void __flush_icache_range(unsigned long start, unsigned long end);
+
+/* Flush the entire icache on this cpu. */
+#define __flush_icache() __flush_icache_range(0, CHIP_L1I_CACHE_SIZE())
+
+#ifdef CONFIG_SMP
+/*
+ * When the kernel writes to its own text we need to do an SMP
+ * broadcast to make the L1I coherent everywhere.  This includes
+ * module load and single step.
+ */
+extern void flush_icache_range(unsigned long start, unsigned long end);
+#else
+#define flush_icache_range __flush_icache_range
+#endif
+
+/*
+ * An update to an executable user page requires icache flushing.
+ * We could carefully update only tiles that are running this process,
+ * and rely on the fact that we flush the icache on every context
+ * switch to avoid doing extra work here.  But for now, I'll be
+ * conservative and just do a global icache flush.
+ */
+static inline void copy_to_user_page(struct vm_area_struct *vma,
+                                     struct page *page, unsigned long vaddr,
+                                     void *dst, void *src, int len)
+{
+        memcpy(dst, src, len);
+        if (vma->vm_flags & VM_EXEC) {
+                flush_icache_range((unsigned long) dst,
+                                   (unsigned long) dst + len);
+        }
+}
+
+#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
+        memcpy((dst), (src), (len))
+
+/*
+ * Invalidate a VA range; pads to L2 cacheline boundaries.
+ *
+ * Note that on TILE64, __inv_buffer() actually flushes modified
+ * cache lines in addition to invalidating them, i.e., it's the
+ * same as __finv_buffer().
+ */
+static inline void __inv_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_inv(next);
+                next += CHIP_INV_STRIDE();
+        }
+}
+
+/* Flush a VA range; pads to L2 cacheline boundaries. */
+static inline void __flush_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_flush(next);
+                next += CHIP_FLUSH_STRIDE();
+        }
+}
+
+/* Flush & invalidate a VA range; pads to L2 cacheline boundaries. */
+static inline void __finv_buffer(void *buffer, size_t size)
+{
+        char *next = (char *)((long)buffer & -L2_CACHE_BYTES);
+        char *finish = (char *)L2_CACHE_ALIGN((long)buffer + size);
+        while (next < finish) {
+                __insn_finv(next);
+                next += CHIP_FINV_STRIDE();
+        }
+}
+
+
+/* Invalidate a VA range, then memory fence. */
+static inline void inv_buffer(void *buffer, size_t size)
+{
+        __inv_buffer(buffer, size);
+        mb_incoherent();
+}
+
+/* Flush a VA range, then memory fence. */
+static inline void flush_buffer(void *buffer, size_t size)
+{
+        __flush_buffer(buffer, size);
+        mb_incoherent();
+}
+
+/* Flush & invalidate a VA range, then memory fence. */
+static inline void finv_buffer(void *buffer, size_t size)
+{
+        __finv_buffer(buffer, size);
+        mb_incoherent();
+}
+
+#endif /* _ASM_TILE_CACHEFLUSH_H */