/* 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; }