1 /*
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 #include <asm/shmparam.h>
23
24 /*
25 * Semantically we need this because icache doesn't snoop dcache/dma.
26 * However ARC Cache flush requires paddr as well as vaddr, latter not available
27 * in the flush_icache_page() API. So we no-op it but do the equivalent work
28 * in update_mmu_cache()
29 */
30 #define flush_icache_page(vma, page)
31
32 void flush_cache_all(void);
33
34 void flush_icache_range(unsigned long kstart, unsigned long kend);
35 void __sync_icache_dcache(phys_addr_t paddr, unsigned long vaddr, int len);
36 void __inv_icache_page(phys_addr_t paddr, unsigned long vaddr);
37 void __flush_dcache_page(phys_addr_t paddr, unsigned long vaddr);
38
39 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
40
41 void flush_dcache_page(struct page *page);
42
43 void dma_cache_wback_inv(phys_addr_t start, unsigned long sz);
44 void dma_cache_inv(phys_addr_t start, unsigned long sz);
45 void dma_cache_wback(phys_addr_t start, unsigned long sz);
46
47 #define flush_dcache_mmap_lock(mapping) do { } while (0)
48 #define flush_dcache_mmap_unlock(mapping) do { } while (0)
49
50 /* TBD: optimize this */
51 #define flush_cache_vmap(start, end) flush_cache_all()
52 #define flush_cache_vunmap(start, end) flush_cache_all()
53
54 #define flush_cache_dup_mm(mm) /* called on fork (VIVT only) */
55
56 #ifndef CONFIG_ARC_CACHE_VIPT_ALIASING
57
58 #define flush_cache_mm(mm) /* called on munmap/exit */
59 #define flush_cache_range(mm, u_vstart, u_vend)
60 #define flush_cache_page(vma, u_vaddr, pfn) /* PF handling/COW-break */
61
62 #else /* VIPT aliasing dcache */
63
64 /* To clear out stale userspace mappings */
65 void flush_cache_mm(struct mm_struct *mm);
66 void flush_cache_range(struct vm_area_struct *vma,
67 unsigned long start,unsigned long end);
68 void flush_cache_page(struct vm_area_struct *vma,
69 unsigned long user_addr, unsigned long page);
70
71 /*
72 * To make sure that userspace mapping is flushed to memory before
73 * get_user_pages() uses a kernel mapping to access the page
74 */
75 #define ARCH_HAS_FLUSH_ANON_PAGE
76 void flush_anon_page(struct vm_area_struct *vma,
77 struct page *page, unsigned long u_vaddr);
78
79 #endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */
80
81 /*
82 * A new pagecache page has PG_arch_1 clear - thus dcache dirty by default
83 * This works around some PIO based drivers which don't call flush_dcache_page
84 * to record that they dirtied the dcache
85 */
86 #define PG_dc_clean PG_arch_1
87
88 #define CACHE_COLORS_NUM 4
89 #define CACHE_COLORS_MSK (CACHE_COLORS_NUM - 1)
90 #define CACHE_COLOR(addr) (((unsigned long)(addr) >> (PAGE_SHIFT)) & CACHE_COLORS_MSK)
91
92 /*
93 * Simple wrapper over config option
94 * Bootup code ensures that hardware matches kernel configuration
95 */
cache_is_vipt_aliasing(void)96 static inline int cache_is_vipt_aliasing(void)
97 {
98 return IS_ENABLED(CONFIG_ARC_CACHE_VIPT_ALIASING);
99 }
100
101 /*
102 * checks if two addresses (after page aligning) index into same cache set
103 */
104 #define addr_not_cache_congruent(addr1, addr2) \
105 ({ \
106 cache_is_vipt_aliasing() ? \
107 (CACHE_COLOR(addr1) != CACHE_COLOR(addr2)) : 0; \
108 })
109
110 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
111 do { \
112 memcpy(dst, src, len); \
113 if (vma->vm_flags & VM_EXEC) \
114 __sync_icache_dcache((unsigned long)(dst), vaddr, len); \
115 } while (0)
116
117 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
118 memcpy(dst, src, len); \
119
120 #endif
121
