1/* cache-page.c: whole-page cache wrangling functions for MMU linux 2 * 3 * Copyright (C) 2004 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 License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11#include <linux/sched.h> 12#include <linux/mm.h> 13#include <linux/highmem.h> 14#include <linux/module.h> 15#include <asm/pgalloc.h> 16 17/*****************************************************************************/ 18/* 19 * DCF takes a virtual address and the page may not currently have one 20 * - temporarily hijack a kmap_atomic() slot and attach the page to it 21 */ 22void flush_dcache_page(struct page *page) 23{ 24 unsigned long dampr2; 25 void *vaddr; 26 27 dampr2 = __get_DAMPR(2); 28 29 vaddr = kmap_atomic_primary(page); 30 31 frv_dcache_writeback((unsigned long) vaddr, (unsigned long) vaddr + PAGE_SIZE); 32 33 kunmap_atomic_primary(vaddr); 34 35 if (dampr2) { 36 __set_DAMPR(2, dampr2); 37 __set_IAMPR(2, dampr2); 38 } 39 40} /* end flush_dcache_page() */ 41 42EXPORT_SYMBOL(flush_dcache_page); 43 44/*****************************************************************************/ 45/* 46 * ICI takes a virtual address and the page may not currently have one 47 * - so we temporarily attach the page to a bit of virtual space so that is can be flushed 48 */ 49void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, 50 unsigned long start, unsigned long len) 51{ 52 unsigned long dampr2; 53 void *vaddr; 54 55 dampr2 = __get_DAMPR(2); 56 57 vaddr = kmap_atomic_primary(page); 58 59 start = (start & ~PAGE_MASK) | (unsigned long) vaddr; 60 frv_cache_wback_inv(start, start + len); 61 62 kunmap_atomic_primary(vaddr); 63 64 if (dampr2) { 65 __set_DAMPR(2, dampr2); 66 __set_IAMPR(2, dampr2); 67 } 68 69} /* end flush_icache_user_range() */ 70 71EXPORT_SYMBOL(flush_icache_user_range); 72