[linux-2.6-block.git] / arch / mn10300 / mm / cache.c

/* MN10300 Cache flushing routines
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/threads.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <asm/uaccess.h>

EXPORT_SYMBOL(mn10300_icache_inv);
EXPORT_SYMBOL(mn10300_dcache_inv);
EXPORT_SYMBOL(mn10300_dcache_inv_range);
EXPORT_SYMBOL(mn10300_dcache_inv_range2);
EXPORT_SYMBOL(mn10300_dcache_inv_page);

#ifdef CONFIG_MN10300_CACHE_WBACK
EXPORT_SYMBOL(mn10300_dcache_flush);
EXPORT_SYMBOL(mn10300_dcache_flush_inv);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
EXPORT_SYMBOL(mn10300_dcache_flush_range);
EXPORT_SYMBOL(mn10300_dcache_flush_range2);
EXPORT_SYMBOL(mn10300_dcache_flush_page);
#endif

/*
 * write a page back from the dcache and invalidate the icache so that we can
 * run code from it that we've just written into it
 */
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
{
	mn10300_dcache_flush_page(page_to_phys(page));
	mn10300_icache_inv();
}
EXPORT_SYMBOL(flush_icache_page);

/*
 * write some code we've just written back from the dcache and invalidate the
 * icache so that we can run that code
 */
void flush_icache_range(unsigned long start, unsigned long end)
{
#ifdef CONFIG_MN10300_CACHE_WBACK
	unsigned long addr, size, off;
	struct page *page;
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *ppte, pte;

	for (; start < end; start += size) {
		/* work out how much of the page to flush */
		off = start & (PAGE_SIZE - 1);

		size = end - start;
		if (size > PAGE_SIZE - off)
			size = PAGE_SIZE - off;

		/* get the physical address the page is mapped to from the page
		 * tables */
		pgd = pgd_offset(current->mm, start);
		if (!pgd || !pgd_val(*pgd))
			continue;

		pud = pud_offset(pgd, start);
		if (!pud || !pud_val(*pud))
			continue;

		pmd = pmd_offset(pud, start);
		if (!pmd || !pmd_val(*pmd))
			continue;

		ppte = pte_offset_map(pmd, start);
		if (!ppte)
			continue;
		pte = *ppte;
		pte_unmap(ppte);

		if (pte_none(pte))
			continue;

		page = pte_page(pte);
		if (!page)
			continue;

		addr = page_to_phys(page);

		/* flush the dcache and invalidate the icache coverage on that
		 * region */
		mn10300_dcache_flush_range2(addr + off, size);
	}
#endif

	mn10300_icache_inv();
}
EXPORT_SYMBOL(flush_icache_range);

/*
 * allow userspace to flush the instruction cache
 */
asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
{
	if (end < start)
		return -EINVAL;

	flush_icache_range(start, end);
	return 0;
}
Commit	Line	Data
b920de1b DH	1	/* MN10300 Cache flushing routines
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11	#include <linux/module.h>
	12	#include <linux/mm.h>
	13	#include <linux/mman.h>
	14	#include <linux/threads.h>
	15	#include <asm/page.h>
	16	#include <asm/pgtable.h>
	17	#include <asm/processor.h>
	18	#include <asm/cacheflush.h>
	19	#include <asm/io.h>
	20	#include <asm/uaccess.h>
	21
	22	EXPORT_SYMBOL(mn10300_icache_inv);
	23	EXPORT_SYMBOL(mn10300_dcache_inv);
	24	EXPORT_SYMBOL(mn10300_dcache_inv_range);
	25	EXPORT_SYMBOL(mn10300_dcache_inv_range2);
	26	EXPORT_SYMBOL(mn10300_dcache_inv_page);
	27
	28	#ifdef CONFIG_MN10300_CACHE_WBACK
	29	EXPORT_SYMBOL(mn10300_dcache_flush);
	30	EXPORT_SYMBOL(mn10300_dcache_flush_inv);
	31	EXPORT_SYMBOL(mn10300_dcache_flush_inv_range);
	32	EXPORT_SYMBOL(mn10300_dcache_flush_inv_range2);
	33	EXPORT_SYMBOL(mn10300_dcache_flush_inv_page);
	34	EXPORT_SYMBOL(mn10300_dcache_flush_range);
	35	EXPORT_SYMBOL(mn10300_dcache_flush_range2);
	36	EXPORT_SYMBOL(mn10300_dcache_flush_page);
	37	#endif
	38
	39	/*
	40	* write a page back from the dcache and invalidate the icache so that we can
	41	* run code from it that we've just written into it
	42	*/
	43	void flush_icache_page(struct vm_area_struct vma, struct page page)
	44	{
	45	mn10300_dcache_flush_page(page_to_phys(page));
	46	mn10300_icache_inv();
	47	}
	48	EXPORT_SYMBOL(flush_icache_page);
	49
	50	/*
	51	* write some code we've just written back from the dcache and invalidate the
	52	* icache so that we can run that code
	53	*/
	54	void flush_icache_range(unsigned long start, unsigned long end)
	55	{
	56	#ifdef CONFIG_MN10300_CACHE_WBACK
	57	unsigned long addr, size, off;
	58	struct page *page;
	59	pgd_t *pgd;
	60	pud_t *pud;
	61	pmd_t *pmd;
	62	pte_t *ppte, pte;
	63
	64	for (; start < end; start += size) {
65	/* work out how much of the page to flush */
66	off = start & (PAGE_SIZE - 1);
67
68	size = end - start;
69	if (size > PAGE_SIZE - off)
70	size = PAGE_SIZE - off;
71
72	/* get the physical address the page is mapped to from the page
73	* tables */
74	pgd = pgd_offset(current->mm, start);
75	if (!pgd \|\| !pgd_val(*pgd))
76	continue;
77
78	pud = pud_offset(pgd, start);
79	if (!pud \|\| !pud_val(*pud))
80	continue;
81
82	pmd = pmd_offset(pud, start);
83	if (!pmd \|\| !pmd_val(*pmd))
84	continue;
85
86	ppte = pte_offset_map(pmd, start);
87	if (!ppte)
88	continue;
89	pte = *ppte;
90	pte_unmap(ppte);
91
92	if (pte_none(pte))
93	continue;
94
95	page = pte_page(pte);
96	if (!page)
97	continue;
98
99	addr = page_to_phys(page);
100
101	/* flush the dcache and invalidate the icache coverage on that
102	* region */
103	mn10300_dcache_flush_range2(addr + off, size);
104	}
105	#endif
106
107	mn10300_icache_inv();
108	}
109	EXPORT_SYMBOL(flush_icache_range);
110
111	/*
112	* allow userspace to flush the instruction cache
113	*/
114	asmlinkage long sys_cacheflush(unsigned long start, unsigned long end)
115	{
116	if (end < start)
117	return -EINVAL;
118
119	flush_icache_range(start, end);
120	return 0;
121	}