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-rw-r--r--arch/m68knommu/mm/memory.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/m68knommu/mm/memory.c b/arch/m68knommu/mm/memory.c
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+++ b/arch/m68knommu/mm/memory.c
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+/*
+ * linux/arch/m68knommu/mm/memory.c
+ *
+ * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
+ * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
+ *
+ * Based on:
+ *
+ * linux/arch/m68k/mm/memory.c
+ *
+ * Copyright (C) 1995 Hamish Macdonald
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/traps.h>
+#include <asm/io.h>
+
+/*
+ * cache_clear() semantics: Clear any cache entries for the area in question,
+ * without writing back dirty entries first. This is useful if the data will
+ * be overwritten anyway, e.g. by DMA to memory. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_clear (unsigned long paddr, int len)
+{
+}
+
+
+/*
+ * Define cache invalidate functions. The ColdFire 5407 is really
+ * the only processor that needs to do some work here. Anything
+ * that has separate data and instruction caches will be a problem.
+ */
+#ifdef CONFIG_M5407
+
+static __inline__ void cache_invalidate_lines(unsigned long paddr, int len)
+{
+ unsigned long sset, eset;
+
+ sset = (paddr & 0x00000ff0);
+ eset = ((paddr + len) & 0x0000ff0) + 0x10;
+
+ __asm__ __volatile__ (
+ "nop\n\t"
+ "clrl %%d0\n\t"
+ "1:\n\t"
+ "movel %0,%%a0\n\t"
+ "addl %%d0,%%a0\n\t"
+ "2:\n\t"
+ ".word 0xf4e8\n\t"
+ "addl #0x10,%%a0\n\t"
+ "cmpl %1,%%a0\n\t"
+ "blt 2b\n\t"
+ "addql #1,%%d0\n\t"
+ "cmpil #4,%%d0\n\t"
+ "bne 1b"
+ : : "a" (sset), "a" (eset) : "d0", "a0" );
+}
+
+#else
+#define cache_invalidate_lines(a,b)
+#endif
+
+
+/*
+ * cache_push() semantics: Write back any dirty cache data in the given area,
+ * and invalidate the range in the instruction cache. It needs not (but may)
+ * invalidate those entries also in the data cache. The range is defined by a
+ * _physical_ address.
+ */
+
+void cache_push (unsigned long paddr, int len)
+{
+ cache_invalidate_lines(paddr, len);
+}
+
+
+/*
+ * cache_push_v() semantics: Write back any dirty cache data in the given
+ * area, and invalidate those entries at least in the instruction cache. This
+ * is intended to be used after data has been written that can be executed as
+ * code later. The range is defined by a _user_mode_ _virtual_ address (or,
+ * more exactly, the space is defined by the %sfc/%dfc register.)
+ */
+
+void cache_push_v (unsigned long vaddr, int len)
+{
+ cache_invalidate_lines(vaddr, len);
+}
+
+/* Map some physical address range into the kernel address space. The
+ * code is copied and adapted from map_chunk().
+ */
+
+unsigned long kernel_map(unsigned long paddr, unsigned long size,
+ int nocacheflag, unsigned long *memavailp )
+{
+ return paddr;
+}
+
+
+int is_in_rom(unsigned long addr)
+{
+ extern unsigned long _ramstart, _ramend;
+
+ /*
+ * What we are really trying to do is determine if addr is
+ * in an allocated kernel memory region. If not then assume
+ * we cannot free it or otherwise de-allocate it. Ideally
+ * we could restrict this to really being in a ROM or flash,
+ * but that would need to be done on a board by board basis,
+ * not globally.
+ */
+ if ((addr < _ramstart) || (addr >= _ramend))
+ return(1);
+
+ /* Default case, not in ROM */
+ return(0);
+}
+