sh: rename pg-mmu.c -> cache.c, enable generically.

This builds in the newly created cache.c (renamed from pg-mmu.c) for both
MMU and NOMMU configurations. The kmap_coherent() stubs and alias
information recorded by each CPU family takes care of doing the right
thing while enabling the code to be commonly shared.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 129 insertions, 0 deletions

diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c
new file mode 100644
index 000000000000..f51d0a4eb3ba
--- /dev/null
+++ b/arch/sh/mm/cache.c
@@ -0,0 +1,129 @@
+/*
+ * arch/sh/mm/pg-mmu.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>
+
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+                       unsigned long vaddr, void *dst, const void *src,
+                       unsigned long len)
+{
+        if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
+            !test_bit(PG_dcache_dirty, &page->flags)) {
+                void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+                memcpy(vto, src, len);
+                kunmap_coherent();
+        } else {
+                memcpy(dst, src, len);
+                if (boot_cpu_data.dcache.n_aliases)
+                        set_bit(PG_dcache_dirty, &page->flags);
+        }
+
+        if (vma->vm_flags & VM_EXEC)
+                flush_cache_page(vma, vaddr, page_to_pfn(page));
+}
+
+void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
+                         unsigned long vaddr, void *dst, const void *src,
+                         unsigned long len)
+{
+        if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
+            !test_bit(PG_dcache_dirty, &page->flags)) {
+                void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
+                memcpy(dst, vfrom, len);
+                kunmap_coherent();
+        } else {
+                memcpy(dst, src, len);
+                if (boot_cpu_data.dcache.n_aliases)
+                        set_bit(PG_dcache_dirty, &page->flags);
+        }
+}
+
+void copy_user_highpage(struct page *to, struct page *from,
+                        unsigned long vaddr, struct vm_area_struct *vma)
+{
+        void *vfrom, *vto;
+
+        vto = kmap_atomic(to, KM_USER1);
+
+        if (boot_cpu_data.dcache.n_aliases && page_mapped(from) &&
+            !test_bit(PG_dcache_dirty, &from->flags)) {
+                vfrom = kmap_coherent(from, vaddr);
+                copy_page(vto, vfrom);
+                kunmap_coherent();
+        } else {
+                vfrom = kmap_atomic(from, KM_USER0);
+                copy_page(vto, vfrom);
+                kunmap_atomic(vfrom, KM_USER0);
+        }
+
+        if (pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
+                __flush_wback_region(vto, PAGE_SIZE);
+
+        kunmap_atomic(vto, KM_USER1);
+        /* Make sure this page is cleared on other CPU's too before using it */
+        smp_wmb();
+}
+EXPORT_SYMBOL(copy_user_highpage);
+
+void clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+        void *kaddr = kmap_atomic(page, KM_USER0);
+
+        clear_page(kaddr);
+
+        if (pages_do_alias((unsigned long)kaddr, vaddr & PAGE_MASK))
+                __flush_wback_region(kaddr, PAGE_SIZE);
+
+        kunmap_atomic(kaddr, KM_USER0);
+}
+EXPORT_SYMBOL(clear_user_highpage);
+
+void __update_cache(struct vm_area_struct *vma,
+                    unsigned long address, pte_t pte)
+{
+        struct page *page;
+        unsigned long pfn = pte_pfn(pte);
+
+        if (!boot_cpu_data.dcache.n_aliases)
+                return;
+
+        page = pfn_to_page(pfn);
+        if (pfn_valid(pfn) && page_mapping(page)) {
+                int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
+                if (dirty) {
+                        unsigned long addr = (unsigned long)page_address(page);
+
+                        if (pages_do_alias(addr, address & PAGE_MASK))
+                                __flush_wback_region((void *)addr, PAGE_SIZE);
+                }
+        }
+}
+
+void __flush_anon_page(struct page *page, unsigned long vmaddr)
+{
+        unsigned long addr = (unsigned long) page_address(page);
+
+        if (pages_do_alias(addr, vmaddr)) {
+                if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
+                    !test_bit(PG_dcache_dirty, &page->flags)) {
+                        void *kaddr;
+
+                        kaddr = kmap_coherent(page, vmaddr);
+                        __flush_wback_region((void *)kaddr, PAGE_SIZE);
+                        kunmap_coherent();
+                } else
+                        __flush_wback_region((void *)addr, PAGE_SIZE);
+        }
+}