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Vineet Gupta95d69762013-01-18 15:12:19 +05301/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * vineetg: May 2011: for Non-aliasing VIPT D-cache following can be NOPs
9 * -flush_cache_dup_mm (fork)
10 * -likewise for flush_cache_mm (exit/execve)
11 * -likewise for flush_cache_{range,page} (munmap, exit, COW-break)
12 *
13 * vineetg: April 2008
14 * -Added a critical CacheLine flush to copy_to_user_page( ) which
15 * was causing gdbserver to not setup breakpoints consistently
16 */
17
18#ifndef _ASM_CACHEFLUSH_H
19#define _ASM_CACHEFLUSH_H
20
21#include <linux/mm.h>
22
Vineet Gupta24603fd2013-04-11 18:36:35 +053023/*
24 * Semantically we need this because icache doesn't snoop dcache/dma.
25 * However ARC Cache flush requires paddr as well as vaddr, latter not available
26 * in the flush_icache_page() API. So we no-op it but do the equivalent work
27 * in update_mmu_cache()
28 */
29#define flush_icache_page(vma, page)
30
Vineet Gupta95d69762013-01-18 15:12:19 +053031void flush_cache_all(void);
32
33void flush_icache_range(unsigned long start, unsigned long end);
Vineet Gupta94bad1a2013-04-12 12:20:23 +053034void __sync_icache_dcache(unsigned long paddr, unsigned long vaddr, int len);
Vineet Gupta24603fd2013-04-11 18:36:35 +053035void __inv_icache_page(unsigned long paddr, unsigned long vaddr);
Vineet Gupta6ec18a82013-05-09 15:10:18 +053036void __flush_dcache_page(unsigned long paddr, unsigned long vaddr);
Vineet Gupta95d69762013-01-18 15:12:19 +053037
38#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
39
40void flush_dcache_page(struct page *page);
41
42void dma_cache_wback_inv(unsigned long start, unsigned long sz);
43void dma_cache_inv(unsigned long start, unsigned long sz);
44void dma_cache_wback(unsigned long start, unsigned long sz);
45
46#define flush_dcache_mmap_lock(mapping) do { } while (0)
47#define flush_dcache_mmap_unlock(mapping) do { } while (0)
48
49/* TBD: optimize this */
50#define flush_cache_vmap(start, end) flush_cache_all()
51#define flush_cache_vunmap(start, end) flush_cache_all()
52
Vineet Gupta4102b532013-05-09 21:54:51 +053053#define flush_cache_dup_mm(mm) /* called on fork (VIVT only) */
54
55#ifndef CONFIG_ARC_CACHE_VIPT_ALIASING
56
Vineet Gupta95d69762013-01-18 15:12:19 +053057#define flush_cache_mm(mm) /* called on munmap/exit */
58#define flush_cache_range(mm, u_vstart, u_vend)
59#define flush_cache_page(vma, u_vaddr, pfn) /* PF handling/COW-break */
60
Vineet Gupta4102b532013-05-09 21:54:51 +053061#else /* VIPT aliasing dcache */
62
63/* To clear out stale userspace mappings */
64void flush_cache_mm(struct mm_struct *mm);
65void flush_cache_range(struct vm_area_struct *vma,
66 unsigned long start,unsigned long end);
67void flush_cache_page(struct vm_area_struct *vma,
68 unsigned long user_addr, unsigned long page);
69
70/*
71 * To make sure that userspace mapping is flushed to memory before
72 * get_user_pages() uses a kernel mapping to access the page
73 */
74#define ARCH_HAS_FLUSH_ANON_PAGE
75void flush_anon_page(struct vm_area_struct *vma,
76 struct page *page, unsigned long u_vaddr);
77
78#endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */
79
80/*
81 * Simple wrapper over config option
82 * Bootup code ensures that hardware matches kernel configuration
83 */
84static inline int cache_is_vipt_aliasing(void)
85{
86#ifdef CONFIG_ARC_CACHE_VIPT_ALIASING
87 return 1;
88#else
89 return 0;
90#endif
91}
92
93#define CACHE_COLOR(addr) (((unsigned long)(addr) >> (PAGE_SHIFT)) & 3)
94
95/*
96 * checks if two addresses (after page aligning) index into same cache set
97 */
98#define addr_not_cache_congruent(addr1, addr2) \
99 cache_is_vipt_aliasing() ? \
100 (CACHE_COLOR(addr1) != CACHE_COLOR(addr2)) : 0 \
101
Vineet Gupta95d69762013-01-18 15:12:19 +0530102#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
103do { \
104 memcpy(dst, src, len); \
105 if (vma->vm_flags & VM_EXEC) \
Vineet Gupta94bad1a2013-04-12 12:20:23 +0530106 __sync_icache_dcache((unsigned long)(dst), vaddr, len); \
Vineet Gupta95d69762013-01-18 15:12:19 +0530107} while (0)
108
109#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
110 memcpy(dst, src, len); \
111
112#endif