2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 - 2003 by Ralf Baechle
8 #include <linux/config.h>
9 #include <linux/init.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/sched.h>
15 #include <asm/cacheflush.h>
16 #include <asm/processor.h>
18 #include <asm/cpu-features.h>
20 /* Cache operations. */
21 void (*flush_cache_all)(void);
22 void (*__flush_cache_all)(void);
23 void (*flush_cache_mm)(struct mm_struct *mm);
24 void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
26 void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
28 void (*flush_icache_range)(unsigned long __user start,
29 unsigned long __user end);
30 void (*flush_icache_page)(struct vm_area_struct *vma, struct page *page);
32 /* MIPS specific cache operations */
33 void (*flush_cache_sigtramp)(unsigned long addr);
34 void (*flush_data_cache_page)(unsigned long addr);
35 void (*flush_icache_all)(void);
37 EXPORT_SYMBOL(flush_data_cache_page);
39 #ifdef CONFIG_DMA_NONCOHERENT
41 /* DMA cache operations. */
42 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
43 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
44 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
46 EXPORT_SYMBOL(_dma_cache_wback_inv);
47 EXPORT_SYMBOL(_dma_cache_wback);
48 EXPORT_SYMBOL(_dma_cache_inv);
50 #endif /* CONFIG_DMA_NONCOHERENT */
53 * We could optimize the case where the cache argument is not BCACHE but
54 * that seems very atypical use ...
56 asmlinkage int sys_cacheflush(unsigned long __user addr,
57 unsigned long bytes, unsigned int cache)
61 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
64 flush_icache_range(addr, addr + bytes);
69 void __flush_dcache_page(struct page *page)
71 struct address_space *mapping = page_mapping(page);
74 if (mapping && !mapping_mapped(mapping)) {
75 SetPageDcacheDirty(page);
80 * We could delay the flush for the !page_mapping case too. But that
81 * case is for exec env/arg pages and those are %99 certainly going to
82 * get faulted into the tlb (and thus flushed) anyways.
84 addr = (unsigned long) page_address(page);
85 flush_data_cache_page(addr);
88 EXPORT_SYMBOL(__flush_dcache_page);
90 void __update_cache(struct vm_area_struct *vma, unsigned long address,
94 unsigned long pfn, addr;
97 if (pfn_valid(pfn) && (page = pfn_to_page(pfn), page_mapping(page)) &&
98 Page_dcache_dirty(page)) {
99 if (pages_do_alias((unsigned long)page_address(page),
100 address & PAGE_MASK)) {
101 addr = (unsigned long) page_address(page);
102 flush_data_cache_page(addr);
105 ClearPageDcacheDirty(page);
109 #define __weak __attribute__((weak))
111 static char cache_panic[] __initdata = "Yeee, unsupported cache architecture.";
113 void __init cpu_cache_init(void)
115 if (cpu_has_3k_cache) {
116 extern void __weak r3k_cache_init(void);
121 if (cpu_has_6k_cache) {
122 extern void __weak r6k_cache_init(void);
127 if (cpu_has_4k_cache) {
128 extern void __weak r4k_cache_init(void);
133 if (cpu_has_8k_cache) {
134 extern void __weak r8k_cache_init(void);
139 if (cpu_has_tx39_cache) {
140 extern void __weak tx39_cache_init(void);
145 if (cpu_has_sb1_cache) {
146 extern void __weak sb1_cache_init(void);