[linuxsh-dev] non-cachable mmap

[NIIBE Y. <gn...@m1...>]

Here's a patch to implement non-cached mmap.

2001-12-20  Takashi Yoshii  <yos...@hi...>

	* include/asm-sh/pgtable.h (pgprot_noncached): Defined and
	implemented.

Index: include/asm-sh/pgtable.h
===================================================================
RCS file: /cvsroot/linuxsh/linux/include/asm-sh/pgtable.h,v
retrieving revision 1.2
diff -u -3 -p -r1.2 pgtable.h
--- include/asm-sh/pgtable.h	2001/12/03 22:15:35	1.2
+++ include/asm-sh/pgtable.h	2001/12/20 02:51:09
@@ -237,6 +237,19 @@ static inline pte_t pte_mkyoung(pte_t pt
 static inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
 
 /*
+ * Macro and implementation to make a page protection as uncachable.
+ */
+#define pgprot_noncached pgprot_noncached
+
+static inline pgprot_t pgprot_noncached(pgprot_t _prot)
+{
+	unsigned long prot = pgprot_val(_prot);
+
+	prot &= ~_PAGE_CACHABLE;
+	return __pgprot(prot);
+}
+
+/*
  * Conversion functions: convert a page and protection to a page entry,
  * and a page entry and page directory to the page they refer to.
  *
--