patch-2.4.22 linux-2.4.22/arch/mips/mm/cache.c

• Lines: 68
• Date: 2003-08-25 04:44:40.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/mm/cache.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/mm/cache.c linux-2.4.22/arch/mips/mm/cache.c
@@ -0,0 +1,67 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994 - 2003 by Ralf Baechle
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+
+#include <asm/cacheflush.h>
+
+asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
+{
+	/* This should flush more selectivly ...  */
+	__flush_cache_all();
+
+	return 0;
+}
+
+void flush_dcache_page(struct page *page)
+{
+	unsigned long addr;
+
+	if (!cpu_has_dc_aliases)
+		return;
+
+	if (page->mapping && page->mapping->i_mmap == NULL &&
+	    page->mapping->i_mmap_shared == NULL) {
+		SetPageDcacheDirty(page);
+
+		return;
+	}
+
+	/*
+	 * We could delay the flush for the !page->mapping case too.  But that
+	 * case is for exec env/arg pages and those are 99% certainly going to
+	 * get faulted into the tlb (and thus flushed) anyways.
+	 */
+	addr = (unsigned long) page_address(page);
+	flush_data_cache_page(addr);
+}
+
+void __update_cache(struct vm_area_struct *vma, unsigned long address,
+        pte_t pte)
+{
+	unsigned long addr;
+	struct page *page;
+
+	if (!cpu_has_dc_aliases)
+		return;
+
+	page = pte_page(pte);
+	if (VALID_PAGE(page) && page->mapping &&
+	    (page->flags & (1UL << PG_dcache_dirty))) {
+		if (pages_do_alias((unsigned long) page_address(page), address & PAGE_MASK)) {
+			addr = (unsigned long) page_address(page);
+			flush_data_cache_page(addr);
+		}
+
+		ClearPageDcacheDirty(page);
+	}
+}
+
+EXPORT_SYMBOL(flush_dcache_page);