tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2003, 06, 07 by Ralf Baechle (ralf@linux-mips.org)
7 * Copyright (C) 2007 MIPS Technologies, Inc.
8 */
9#include <linux/fs.h>
10#include <linux/fcntl.h>
11#include <linux/init.h>
12#include <linux/kernel.h>
13#include <linux/linkage.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/mm.h>
17
18#include <asm/cacheflush.h>
19#include <asm/processor.h>
20#include <asm/cpu.h>
21#include <asm/cpu-features.h>
22
23/* Cache operations. */
24void (*flush_cache_all)(void);
25void (*__flush_cache_all)(void);
26void (*flush_cache_mm)(struct mm_struct *mm);
27void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
28 unsigned long end);
29void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
30 unsigned long pfn);
31void (*flush_icache_range)(unsigned long start, unsigned long end);
32
33/* MIPS specific cache operations */
34void (*flush_cache_sigtramp)(unsigned long addr);
35void (*local_flush_data_cache_page)(void * addr);
36void (*flush_data_cache_page)(unsigned long addr);
37void (*flush_icache_all)(void);
38
39EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
40EXPORT_SYMBOL(flush_data_cache_page);
41
42#ifdef CONFIG_DMA_NONCOHERENT
43
44/* DMA cache operations. */
45void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
46void (*_dma_cache_wback)(unsigned long start, unsigned long size);
47void (*_dma_cache_inv)(unsigned long start, unsigned long size);
48
49EXPORT_SYMBOL(_dma_cache_wback_inv);
50
51#endif /* CONFIG_DMA_NONCOHERENT */
52
53/*
54 * We could optimize the case where the cache argument is not BCACHE but
55 * that seems very atypical use ...
56 */
57asmlinkage int sys_cacheflush(unsigned long addr,
58 unsigned long bytes, unsigned int cache)
59{
60 if (bytes == 0)
61 return 0;
62 if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
63 return -EFAULT;
64
65 flush_icache_range(addr, addr + bytes);
66
67 return 0;
68}
69
70void __flush_dcache_page(struct page *page)
71{
72 struct address_space *mapping = page_mapping(page);
73 unsigned long addr;
74
75 if (PageHighMem(page))
76 return;
77 if (mapping && !mapping_mapped(mapping)) {
78 SetPageDcacheDirty(page);
79 return;
80 }
81
82 /*
83 * We could delay the flush for the !page_mapping case too. But that
84 * case is for exec env/arg pages and those are %99 certainly going to
85 * get faulted into the tlb (and thus flushed) anyways.
86 */
87 addr = (unsigned long) page_address(page);
88 flush_data_cache_page(addr);
89}
90
91EXPORT_SYMBOL(__flush_dcache_page);
92
93void __flush_anon_page(struct page *page, unsigned long vmaddr)
94{
95 if (pages_do_alias((unsigned long)page_address(page), vmaddr)) {
96 void *kaddr;
97
98 kaddr = kmap_coherent(page, vmaddr);
99 flush_data_cache_page((unsigned long)kaddr);
100 kunmap_coherent();
101 }
102}
103
104EXPORT_SYMBOL(__flush_anon_page);
105
106void __update_cache(struct vm_area_struct *vma, unsigned long address,
107 pte_t pte)
108{
109 struct page *page;
110 unsigned long pfn, addr;
111 int exec = (vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc;
112
113 pfn = pte_pfn(pte);
114 if (unlikely(!pfn_valid(pfn)))
115 return;
116 page = pfn_to_page(pfn);
117 if (page_mapping(page) && Page_dcache_dirty(page)) {
118 addr = (unsigned long) page_address(page);
119 if (exec || pages_do_alias(addr, address & PAGE_MASK))
120 flush_data_cache_page(addr);
121 ClearPageDcacheDirty(page);
122 }
123}
124
125static char cache_panic[] __initdata = "Yeee, unsupported cache architecture.";
126
127void __init cpu_cache_init(void)
128{
129 if (cpu_has_3k_cache) {
130 extern void __weak r3k_cache_init(void);
131
132 r3k_cache_init();
133 return;
134 }
135 if (cpu_has_6k_cache) {
136 extern void __weak r6k_cache_init(void);
137
138 r6k_cache_init();
139 return;
140 }
141 if (cpu_has_4k_cache) {
142 extern void __weak r4k_cache_init(void);
143
144 r4k_cache_init();
145 return;
146 }
147 if (cpu_has_8k_cache) {
148 extern void __weak r8k_cache_init(void);
149
150 r8k_cache_init();
151 return;
152 }
153 if (cpu_has_tx39_cache) {
154 extern void __weak tx39_cache_init(void);
155
156 tx39_cache_init();
157 return;
158 }
159
160 panic(cache_panic);
161}
162
163int __weak __uncached_access(struct file *file, unsigned long addr)
164{
165 if (file->f_flags & O_SYNC)
166 return 1;
167
168 return addr >= __pa(high_memory);
169}