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/kernel.h>
12#include <linux/linkage.h>
13#include <linux/module.h>
14#include <linux/sched.h>
15#include <linux/syscalls.h>
16#include <linux/mm.h>
17
18#include <asm/cacheflush.h>
19#include <asm/highmem.h>
20#include <asm/processor.h>
21#include <asm/cpu.h>
22#include <asm/cpu-features.h>
23
24/* Cache operations. */
25void (*flush_cache_all)(void);
26void (*__flush_cache_all)(void);
27void (*flush_cache_mm)(struct mm_struct *mm);
28void (*flush_cache_range)(struct vm_area_struct *vma, unsigned long start,
29	unsigned long end);
30void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page,
31	unsigned long pfn);
32void (*flush_icache_range)(unsigned long start, unsigned long end);
33EXPORT_SYMBOL_GPL(flush_icache_range);
34void (*local_flush_icache_range)(unsigned long start, unsigned long end);
35EXPORT_SYMBOL_GPL(local_flush_icache_range);
36
37void (*__flush_cache_vmap)(void);
38void (*__flush_cache_vunmap)(void);
39
40void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
41EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
42void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
43
44/* MIPS specific cache operations */
45void (*flush_cache_sigtramp)(unsigned long addr);
46void (*local_flush_data_cache_page)(void * addr);
47void (*flush_data_cache_page)(unsigned long addr);
48void (*flush_icache_all)(void);
49
50EXPORT_SYMBOL_GPL(local_flush_data_cache_page);
51EXPORT_SYMBOL(flush_data_cache_page);
52EXPORT_SYMBOL(flush_icache_all);
53
54#if defined(CONFIG_DMA_NONCOHERENT) || defined(CONFIG_DMA_MAYBE_COHERENT)
55
56/* DMA cache operations. */
57void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
58void (*_dma_cache_wback)(unsigned long start, unsigned long size);
59void (*_dma_cache_inv)(unsigned long start, unsigned long size);
60
61EXPORT_SYMBOL(_dma_cache_wback_inv);
62
63#endif /* CONFIG_DMA_NONCOHERENT || CONFIG_DMA_MAYBE_COHERENT */
64
65/*
66 * We could optimize the case where the cache argument is not BCACHE but
67 * that seems very atypical use ...
68 */
69SYSCALL_DEFINE3(cacheflush, unsigned long, addr, unsigned long, bytes,
70	unsigned int, cache)
71{
72	if (bytes == 0)
73		return 0;
74	if (!access_ok(VERIFY_WRITE, (void __user *) addr, bytes))
75		return -EFAULT;
76
77	flush_icache_range(addr, addr + bytes);
78
79	return 0;
80}
81
82void __flush_dcache_page(struct page *page)
83{
84	struct address_space *mapping = page_mapping(page);
85	unsigned long addr;
86
87	if (mapping && !mapping_mapped(mapping)) {
88		SetPageDcacheDirty(page);
89		return;
90	}
91
92	/*
93	 * We could delay the flush for the !page_mapping case too.  But that
94	 * case is for exec env/arg pages and those are %99 certainly going to
95	 * get faulted into the tlb (and thus flushed) anyways.
96	 */
97	if (PageHighMem(page))
98		addr = (unsigned long)kmap_atomic(page);
99	else
100		addr = (unsigned long)page_address(page);
101
102	flush_data_cache_page(addr);
103
104	if (PageHighMem(page))
105		__kunmap_atomic((void *)addr);
106}
107
108EXPORT_SYMBOL(__flush_dcache_page);
109
110void __flush_anon_page(struct page *page, unsigned long vmaddr)
111{
112	unsigned long addr = (unsigned long) page_address(page);
113
114	if (pages_do_alias(addr, vmaddr)) {
115		if (page_mapped(page) && !Page_dcache_dirty(page)) {
116			void *kaddr;
117
118			kaddr = kmap_coherent(page, vmaddr);
119			flush_data_cache_page((unsigned long)kaddr);
120			kunmap_coherent();
121		} else
122			flush_data_cache_page(addr);
123	}
124}
125
126EXPORT_SYMBOL(__flush_anon_page);
127
128void __update_cache(unsigned long address, pte_t pte)
129{
130	struct page *page;
131	unsigned long pfn, addr;
132	int exec = !pte_no_exec(pte) && !cpu_has_ic_fills_f_dc;
133
134	pfn = pte_pfn(pte);
135	if (unlikely(!pfn_valid(pfn)))
136		return;
137	page = pfn_to_page(pfn);
138	if (Page_dcache_dirty(page)) {
139		if (PageHighMem(page))
140			addr = (unsigned long)kmap_atomic(page);
141		else
142			addr = (unsigned long)page_address(page);
143
144		if (exec || pages_do_alias(addr, address & PAGE_MASK))
145			flush_data_cache_page(addr);
146
147		if (PageHighMem(page))
148			__kunmap_atomic((void *)addr);
149
150		ClearPageDcacheDirty(page);
151	}
152}
153
154unsigned long _page_cachable_default;
155EXPORT_SYMBOL(_page_cachable_default);
156
157static inline void setup_protection_map(void)
158{
159	if (cpu_has_rixi) {
160		protection_map[0]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
161		protection_map[1]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
162		protection_map[2]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
163		protection_map[3]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
164		protection_map[4]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
165		protection_map[5]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
166		protection_map[6]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
167		protection_map[7]  = __pgprot(_page_cachable_default | _PAGE_PRESENT);
168
169		protection_map[8]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
170		protection_map[9]  = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC);
171		protection_map[10] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE | _PAGE_NO_READ);
172		protection_map[11] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
173		protection_map[12] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_NO_READ);
174		protection_map[13] = __pgprot(_page_cachable_default | _PAGE_PRESENT);
175		protection_map[14] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE  | _PAGE_NO_READ);
176		protection_map[15] = __pgprot(_page_cachable_default | _PAGE_PRESENT | _PAGE_WRITE);
177
178	} else {
179		protection_map[0] = PAGE_NONE;
180		protection_map[1] = PAGE_READONLY;
181		protection_map[2] = PAGE_COPY;
182		protection_map[3] = PAGE_COPY;
183		protection_map[4] = PAGE_READONLY;
184		protection_map[5] = PAGE_READONLY;
185		protection_map[6] = PAGE_COPY;
186		protection_map[7] = PAGE_COPY;
187		protection_map[8] = PAGE_NONE;
188		protection_map[9] = PAGE_READONLY;
189		protection_map[10] = PAGE_SHARED;
190		protection_map[11] = PAGE_SHARED;
191		protection_map[12] = PAGE_READONLY;
192		protection_map[13] = PAGE_READONLY;
193		protection_map[14] = PAGE_SHARED;
194		protection_map[15] = PAGE_SHARED;
195	}
196}
197
198void cpu_cache_init(void)
199{
200	if (cpu_has_3k_cache) {
201		extern void __weak r3k_cache_init(void);
202
203		r3k_cache_init();
204	}
205	if (cpu_has_6k_cache) {
206		extern void __weak r6k_cache_init(void);
207
208		r6k_cache_init();
209	}
210	if (cpu_has_4k_cache) {
211		extern void __weak r4k_cache_init(void);
212
213		r4k_cache_init();
214	}
215	if (cpu_has_8k_cache) {
216		extern void __weak r8k_cache_init(void);
217
218		r8k_cache_init();
219	}
220	if (cpu_has_tx39_cache) {
221		extern void __weak tx39_cache_init(void);
222
223		tx39_cache_init();
224	}
225
226	if (cpu_has_octeon_cache) {
227		extern void __weak octeon_cache_init(void);
228
229		octeon_cache_init();
230	}
231
232	setup_protection_map();
233}
234
235int __weak __uncached_access(struct file *file, unsigned long addr)
236{
237	if (file->f_flags & O_DSYNC)
238		return 1;
239
240	return addr >= __pa(high_memory);
241}
242