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 start, unsigned long end);
29 void (*flush_icache_page)(struct vm_area_struct *vma, struct page *page);
31 /* MIPS specific cache operations */
32 void (*flush_cache_sigtramp)(unsigned long addr);
33 void (*flush_data_cache_page)(unsigned long addr);
34 void (*flush_icache_all)(void);
36 EXPORT_SYMBOL(flush_data_cache_page);
38 #ifdef CONFIG_DMA_NONCOHERENT
40 /* DMA cache operations. */
41 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
42 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
43 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
45 EXPORT_SYMBOL(_dma_cache_wback_inv);
46 EXPORT_SYMBOL(_dma_cache_wback);
47 EXPORT_SYMBOL(_dma_cache_inv);
49 #endif /* CONFIG_DMA_NONCOHERENT */
52 * We could optimize the case where the cache argument is not BCACHE but
53 * that seems very atypical use ...
55 asmlinkage int sys_cacheflush(unsigned long addr,
56 unsigned long bytes, unsigned int cache)
60 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
63 flush_icache_range(addr, addr + bytes);
68 void __flush_dcache_page(struct page *page)
70 struct address_space *mapping = page_mapping(page);
73 if (mapping && !mapping_mapped(mapping)) {
74 SetPageDcacheDirty(page);
79 * We could delay the flush for the !page_mapping case too. But that
80 * case is for exec env/arg pages and those are %99 certainly going to
81 * get faulted into the tlb (and thus flushed) anyways.
83 addr = (unsigned long) page_address(page);
84 flush_data_cache_page(addr);
87 EXPORT_SYMBOL(__flush_dcache_page);
89 void __update_cache(struct vm_area_struct *vma, unsigned long address,
93 unsigned long pfn, addr;
96 if (pfn_valid(pfn) && (page = pfn_to_page(pfn), page_mapping(page)) &&
97 Page_dcache_dirty(page)) {
98 if (pages_do_alias((unsigned long)page_address(page),
99 address & PAGE_MASK)) {
100 addr = (unsigned long) page_address(page);
101 flush_data_cache_page(addr);
104 ClearPageDcacheDirty(page);
108 #define __weak __attribute__((weak))
110 static char cache_panic[] __initdata = "Yeee, unsupported cache architecture.";
112 void __init cpu_cache_init(void)
114 if (cpu_has_3k_cache) {
115 extern void __weak r3k_cache_init(void);
120 if (cpu_has_6k_cache) {
121 extern void __weak r6k_cache_init(void);
126 if (cpu_has_4k_cache) {
127 extern void __weak r4k_cache_init(void);
132 if (cpu_has_8k_cache) {
133 extern void __weak r8k_cache_init(void);
138 if (cpu_has_tx39_cache) {
139 extern void __weak tx39_cache_init(void);
144 if (cpu_has_sb1_cache) {
145 extern void __weak sb1_cache_init(void);