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 start, unsigned long end);
28 void (*flush_icache_page)(struct vm_area_struct *vma, struct page *page);
30 /* MIPS specific cache operations */
31 void (*flush_cache_sigtramp)(unsigned long addr);
32 void (*flush_data_cache_page)(unsigned long addr);
33 void (*flush_icache_all)(void);
35 #ifdef CONFIG_DMA_NONCOHERENT
37 /* DMA cache operations. */
38 void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
39 void (*_dma_cache_wback)(unsigned long start, unsigned long size);
40 void (*_dma_cache_inv)(unsigned long start, unsigned long size);
42 EXPORT_SYMBOL(_dma_cache_wback_inv);
43 EXPORT_SYMBOL(_dma_cache_wback);
44 EXPORT_SYMBOL(_dma_cache_inv);
46 #endif /* CONFIG_DMA_NONCOHERENT */
49 * We could optimize the case where the cache argument is not BCACHE but
50 * that seems very atypical use ...
52 asmlinkage int sys_cacheflush(unsigned long addr, unsigned long int bytes,
55 if (!access_ok(VERIFY_WRITE, (void *) addr, bytes))
58 flush_icache_range(addr, addr + bytes);
63 void __flush_dcache_page(struct page *page)
65 struct address_space *mapping = page_mapping(page);
68 if (mapping && !mapping_mapped(mapping)) {
69 SetPageDcacheDirty(page);
74 * We could delay the flush for the !page_mapping case too. But that
75 * case is for exec env/arg pages and those are %99 certainly going to
76 * get faulted into the tlb (and thus flushed) anyways.
78 addr = (unsigned long) page_address(page);
79 flush_data_cache_page(addr);
82 EXPORT_SYMBOL(__flush_dcache_page);
84 void __update_cache(struct vm_area_struct *vma, unsigned long address,
88 unsigned long pfn, addr;
91 if (pfn_valid(pfn) && (page = pfn_to_page(pfn), page_mapping(page)) &&
92 Page_dcache_dirty(page)) {
93 if (pages_do_alias((unsigned long)page_address(page),
94 address & PAGE_MASK)) {
95 addr = (unsigned long) page_address(page);
96 flush_data_cache_page(addr);
99 ClearPageDcacheDirty(page);
103 extern void ld_mmu_r23000(void);
104 extern void ld_mmu_r4xx0(void);
105 extern void ld_mmu_tx39(void);
106 extern void ld_mmu_r6000(void);
107 extern void ld_mmu_tfp(void);
108 extern void ld_mmu_andes(void);
109 extern void ld_mmu_sb1(void);
111 void __init cpu_cache_init(void)
114 #if defined(CONFIG_CPU_R4X00) || defined(CONFIG_CPU_VR41XX) || \
115 defined(CONFIG_CPU_R4300) || defined(CONFIG_CPU_R5000) || \
116 defined(CONFIG_CPU_NEVADA) || defined(CONFIG_CPU_R5432) || \
117 defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_MIPS32) || \
118 defined(CONFIG_CPU_MIPS64) || defined(CONFIG_CPU_TX49XX) || \
119 defined(CONFIG_CPU_RM7000) || defined(CONFIG_CPU_RM9000)
122 } else switch (current_cpu_data.cputype) {
123 #ifdef CONFIG_CPU_R3000
131 #ifdef CONFIG_CPU_TX39XX
138 #ifdef CONFIG_CPU_R10000
144 #ifdef CONFIG_CPU_SB1
151 panic("R8000 is unsupported");
155 panic("Yeee, unsupported cache architecture.");