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Commit dfff0fa6 authored by Paul Mundt's avatar Paul Mundt
Browse files

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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 2277ab4a

arch/sh/include/asm/cacheflush.h

+1 −1
Original line number Diff line number Diff line
@@ -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

+8 −4
Original line number Diff line number Diff line
@@ -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

+2 −1
Original line number Diff line number Diff line
@@ -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

+0 −6
Original line number Diff line number Diff line
@@ -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

+0 −46
Original line number Diff line number Diff line
@@ -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