1 files changed, 65 insertions, 0 deletions

diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
new file mode 100644
index 000000000000..16e01b5fed04
--- /dev/null
+++ b/arch/sh/mm/kmap.c
@@ -0,0 +1,65 @@
+/*
+ * arch/sh/mm/kmap.c
+ *
+ * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
+ * Copyright (C) 2002 - 2009  Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/fs.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+#define kmap_get_fixmap_pte(vaddr)                                     \
+        pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
+
+static pte_t *kmap_coherent_pte;
+
+void __init kmap_coherent_init(void)
+{
+        unsigned long vaddr;
+
+        /* cache the first coherent kmap pte */
+        vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
+        kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
+}
+
+void *kmap_coherent(struct page *page, unsigned long addr)
+{
+        enum fixed_addresses idx;
+        unsigned long vaddr;
+
+        BUG_ON(test_bit(PG_dcache_dirty, &page->flags));
+
+        pagefault_disable();
+
+        idx = FIX_CMAP_END -
+                ((addr & current_cpu_data.dcache.alias_mask) >> PAGE_SHIFT);
+        vaddr = __fix_to_virt(idx);
+
+        BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
+        set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
+
+        return (void *)vaddr;
+}
+
+void kunmap_coherent(void *kvaddr)
+{
+        if (kvaddr >= (void *)FIXADDR_START) {
+                unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
+                enum fixed_addresses idx = __virt_to_fix(vaddr);
+
+                /* XXX.. Kill this later, here for sanity at the moment.. */
+                __flush_purge_region((void *)vaddr, PAGE_SIZE);
+
+                pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
+                local_flush_tlb_one(get_asid(), vaddr);
+        }
+
+        pagefault_enable();
+}