summaryrefslogtreecommitdiff
path: root/arch/sh/mm/cache.c
diff options
context:
space:
mode:
authorPaul Mundt <lethal@linux-sh.org>2009-08-15 09:30:39 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-08-15 09:30:39 +0900
commitcbbe2f68f678a90bebeb30b8a7fcd8aed0614879 (patch)
tree4a8ffeea96f32ff6e532fdc2667181b48d5a26ca /arch/sh/mm/cache.c
parent2739742c24f1a55365e71f0722bfdce8994e9c4e (diff)
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>
Diffstat (limited to 'arch/sh/mm/cache.c')
-rw-r--r--arch/sh/mm/cache.c129
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);
+ }
+}