sh: wire up clear_user_highpage() for sh4, convert sh7705.

This wires up clear_user_highpage() on SH-4 and subsequently converts the
SH7705 32kB cache mode over to using it. Now that the SH-4 implementation
handles all of the dcache purging directly in the aliasing case, there is
no need to do this in the default clear_page() implementation.

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

arch/sh/include/asm/cacheflush.h

@@ -49,7 +49,7 @@ static inline void flush_kernel_dcache_page(struct page *page)
 	flush_dcache_page(page);
 }
 
-#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
+#if (defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)) && !defined(CONFIG_CACHE_OFF)
 extern void copy_to_user_page(struct vm_area_struct *vma,
 	struct page *page, unsigned long vaddr, void *dst, const void *src,
 	unsigned long len);

arch/sh/include/asm/page.h

@@ -56,21 +56,25 @@ pages_do_alias(unsigned long addr1, unsigned long addr2)
 	return (addr1 ^ addr2) & shm_align_mask;
 }
 
-extern void clear_page(void *to);
+
+#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
 extern void copy_page(void *to, void *from);
 
+struct page;
+struct vm_area_struct;
+
 #if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
 	(defined(CONFIG_CPU_SH5) || defined(CONFIG_CPU_SH4) || \
 	 defined(CONFIG_SH7705_CACHE_32KB))
-struct page;
-struct vm_area_struct;
 extern void clear_user_page(void *to, unsigned long address, struct page *page);
 extern void copy_user_page(void *to, void *from, unsigned long address,
 			   struct page *page);
-#if defined(CONFIG_CPU_SH4)
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
 extern void copy_user_highpage(struct page *to, struct page *from,
 			       unsigned long vaddr, struct vm_area_struct *vma);
 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
+extern void clear_user_highpage(struct page *page, unsigned long vaddr);
+#define clear_user_highpage	clear_user_highpage
 #endif
 #else
 #define clear_user_page(page, vaddr, pg)	clear_page(page)

arch/sh/include/asm/pgtable.h

@@ -141,7 +141,8 @@ extern void paging_init(void);
 extern void page_table_range_init(unsigned long start, unsigned long end,
 				  pgd_t *pgd);
 
-#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_CPU_SH4) && defined(CONFIG_MMU)
+#if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \
+    defined(CONFIG_SH7705_CACHE_32KB)) && defined(CONFIG_MMU)
 extern void kmap_coherent_init(void);
 #else
 #define kmap_coherent_init()	do { } while (0)

arch/sh/kernel/sh_ksyms_32.c

@@ -101,11 +101,6 @@ EXPORT_SYMBOL(flush_cache_range);
 EXPORT_SYMBOL(flush_dcache_page);
 #endif
 
-#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
-	(defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
-EXPORT_SYMBOL(clear_user_page);
-#endif
-
 #ifdef CONFIG_MCOUNT
 DECLARE_EXPORT(mcount);
 #endif
@@ -114,7 +109,6 @@ EXPORT_SYMBOL(csum_partial_copy_generic);
 #ifdef CONFIG_IPV6
 EXPORT_SYMBOL(csum_ipv6_magic);
 #endif
-EXPORT_SYMBOL(clear_page);
 EXPORT_SYMBOL(copy_page);
 EXPORT_SYMBOL(__clear_user);
 EXPORT_SYMBOL(_ebss);

arch/sh/lib/clear_page.S

@@ -8,52 +8,6 @@
 #include <linux/linkage.h>
 #include <asm/page.h>
 
-/*
- * clear_page
- * @to: P1 address
- *
- * void clear_page(void *to)
- */
-
-/*
- * r0 --- scratch
- * r4 --- to
- * r5 --- to + PAGE_SIZE
- */
-ENTRY(clear_page)
-	mov	r4,r5
-	mov.l	.Llimit,r0
-	add	r0,r5
-	mov	#0,r0
-	!
-1:
-#if defined(CONFIG_CPU_SH4)
-	movca.l	r0,@r4
-	mov	r4,r1
-#else
-	mov.l	r0,@r4
-#endif
-	add	#32,r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-	mov.l	r0,@-r4
-#if defined(CONFIG_CPU_SH4)
-	ocbwb	@r1
-#endif
-	cmp/eq	r5,r4
-	bf/s	1b
-	 add	#28,r4
-	!
-	rts
-	 nop
-
-	.balign 4
-.Llimit:	.long	(PAGE_SIZE-28)
-
 ENTRY(__clear_user)
 	!
 	mov	#0, r0

arch/sh/mm/Makefile_32

@@ -31,7 +31,7 @@ tlb-$(CONFIG_CPU_HAS_PTEAEX)	:= tlb-pteaex.o
 obj-y				+= $(tlb-y)
 ifndef CONFIG_CACHE_OFF
 obj-$(CONFIG_CPU_SH4)		+= pg-sh4.o
-obj-$(CONFIG_SH7705_CACHE_32KB)	+= pg-sh7705.o
+obj-$(CONFIG_SH7705_CACHE_32KB)	+= pg-sh4.o
 endif
 endif
 

arch/sh/mm/pg-nommu.c

@@ -1,7 +1,7 @@
 /*
  * arch/sh/mm/pg-nommu.c
  *
- * clear_page()/copy_page() implementation for MMUless SH.
+ * copy_page()/__copy_user()/__clear_user() implementations for MMUless SH.
  *
  * Copyright (C) 2003  Paul Mundt
  *
@@ -20,11 +20,6 @@ void copy_page(void *to, void *from)
 	memcpy(to, from, PAGE_SIZE);
 }
 
-void clear_page(void *to)
-{
-	memset(to, 0, PAGE_SIZE);
-}
-
 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n)
 {
 	memcpy(to, from, n);

arch/sh/mm/pg-sh4.c

@@ -2,7 +2,7 @@
  * arch/sh/mm/pg-sh4.c
  *
  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
- * Copyright (C) 2002 - 2007  Paul Mundt
+ * Copyright (C) 2002 - 2009  Paul Mundt
  *
  * Released under the terms of the GNU GPL v2.0.
  */
@@ -58,20 +58,6 @@ static inline void kunmap_coherent(struct page *page)
 	preempt_check_resched();
 }
 
-/*
- * clear_user_page
- * @to: P1 address
- * @address: U0 address to be mapped
- * @page: page (virt_to_page(to))
- */
-void clear_user_page(void *to, unsigned long address, struct page *page)
-{
-	clear_page(to);
-
-	if (pages_do_alias((unsigned long)to, address & PAGE_MASK))
-		__flush_wback_region(to, PAGE_SIZE);
-}
-
 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
 		       unsigned long vaddr, void *dst, const void *src,
 		       unsigned long len)
@@ -128,3 +114,16 @@ void copy_user_highpage(struct page *to, struct page *from,
 	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);