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, unsigned long pfn);
27 void (*flush_icache_range)(unsigned long __user start,
28 unsigned long __user 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 __user addr,
56 unsigned long bytes, unsigned int cache)
58 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
61 flush_icache_range(addr, addr + bytes);
66 void __flush_dcache_page(struct page *page)
68 struct address_space *mapping = page_mapping(page);
71 if (mapping && !mapping_mapped(mapping)) {
72 SetPageDcacheDirty(page);
77 * We could delay the flush for the !page_mapping case too. But that
78 * case is for exec env/arg pages and those are %99 certainly going to
79 * get faulted into the tlb (and thus flushed) anyways.
81 addr = (unsigned long) page_address(page);
82 flush_data_cache_page(addr);
85 EXPORT_SYMBOL(__flush_dcache_page);
87 void __update_cache(struct vm_area_struct *vma, unsigned long address,
91 unsigned long pfn, addr;
94 if (pfn_valid(pfn) && (page = pfn_to_page(pfn), page_mapping(page)) &&
95 Page_dcache_dirty(page)) {
96 if (pages_do_alias((unsigned long)page_address(page),
97 address & PAGE_MASK)) {
98 addr = (unsigned long) page_address(page);
99 flush_data_cache_page(addr);
102 ClearPageDcacheDirty(page);
106 extern void ld_mmu_r23000(void);
107 extern void ld_mmu_r4xx0(void);
108 extern void ld_mmu_tx39(void);
109 extern void ld_mmu_r6000(void);
110 extern void ld_mmu_tfp(void);
111 extern void ld_mmu_andes(void);
112 extern void ld_mmu_sb1(void);
114 void __init cpu_cache_init(void)
117 #if defined(CONFIG_CPU_R4X00) || defined(CONFIG_CPU_VR41XX) || \
118 defined(CONFIG_CPU_R4300) || defined(CONFIG_CPU_R5000) || \
119 defined(CONFIG_CPU_NEVADA) || defined(CONFIG_CPU_R5432) || \
120 defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_MIPS32) || \
121 defined(CONFIG_CPU_MIPS64) || defined(CONFIG_CPU_TX49XX) || \
122 defined(CONFIG_CPU_RM7000) || defined(CONFIG_CPU_RM9000)
125 } else switch (current_cpu_data.cputype) {
126 #ifdef CONFIG_CPU_R3000
134 #ifdef CONFIG_CPU_TX39XX
141 #ifdef CONFIG_CPU_R10000
147 #ifdef CONFIG_CPU_SB1
154 panic("R8000 is unsupported");
158 panic("Yeee, unsupported cache architecture.");