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, 07 by Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2007 MIPS Technologies, Inc.
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);
30 /* MIPS specific cache operations */
31 void (*flush_cache_sigtramp)(unsigned long addr);
32 void (*local_flush_data_cache_page)(void * addr);
33 void (*flush_data_cache_page)(unsigned long addr);
34 void (*flush_icache_all)(void);
36 EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
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 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 (PageHighMem(page))
76 if (mapping && !mapping_mapped(mapping)) {
77 SetPageDcacheDirty(page);
82 * We could delay the flush for the !page_mapping case too. But that
83 * case is for exec env/arg pages and those are %99 certainly going to
84 * get faulted into the tlb (and thus flushed) anyways.
86 addr = (unsigned long) page_address(page);
87 flush_data_cache_page(addr);
90 EXPORT_SYMBOL(__flush_dcache_page);
92 void __flush_anon_page(struct page *page, unsigned long vmaddr)
94 if (pages_do_alias((unsigned long)page_address(page), vmaddr)) {
97 kaddr = kmap_coherent(page, vmaddr);
98 flush_data_cache_page((unsigned long)kaddr);
103 EXPORT_SYMBOL(__flush_anon_page);
105 void __update_cache(struct vm_area_struct *vma, unsigned long address,
109 unsigned long pfn, addr;
110 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
113 if (unlikely(!pfn_valid(pfn)))
115 page = pfn_to_page(pfn);
116 if (page_mapping(page) && Page_dcache_dirty(page)) {
117 addr = (unsigned long) page_address(page);
118 if (exec || pages_do_alias(addr, address & PAGE_MASK))
119 flush_data_cache_page(addr);
120 ClearPageDcacheDirty(page);
124 static char cache_panic[] __initdata = "Yeee, unsupported cache architecture.";
126 void __init cpu_cache_init(void)
128 if (cpu_has_3k_cache) {
129 extern void __weak r3k_cache_init(void);
134 if (cpu_has_6k_cache) {
135 extern void __weak r6k_cache_init(void);
140 if (cpu_has_4k_cache) {
141 extern void __weak r4k_cache_init(void);
146 if (cpu_has_8k_cache) {
147 extern void __weak r8k_cache_init(void);
152 if (cpu_has_tx39_cache) {
153 extern void __weak tx39_cache_init(void);
158 if (cpu_has_sb1_cache) {
159 extern void __weak sb1_cache_init(void);