2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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.
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)
14 * -Added a critical CacheLine flush to copy_to_user_page( ) which
15 * was causing gdbserver to not setup breakpoints consistently
18 #ifndef _ASM_CACHEFLUSH_H
19 #define _ASM_CACHEFLUSH_H
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()
29 #define flush_icache_page(vma, page)
31 void flush_cache_all(void);
33 void flush_icache_range(unsigned long start, unsigned long end);
34 void __sync_icache_dcache(unsigned long paddr, unsigned long vaddr, int len);
35 void __inv_icache_page(unsigned long paddr, unsigned long vaddr);
36 void __flush_dcache_page(unsigned long paddr, unsigned long vaddr);
38 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
40 void flush_dcache_page(struct page *page);
42 void dma_cache_wback_inv(unsigned long start, unsigned long sz);
43 void dma_cache_inv(unsigned long start, unsigned long sz);
44 void dma_cache_wback(unsigned long start, unsigned long sz);
46 #define flush_dcache_mmap_lock(mapping) do { } while (0)
47 #define flush_dcache_mmap_unlock(mapping) do { } while (0)
49 /* TBD: optimize this */
50 #define flush_cache_vmap(start, end) flush_cache_all()
51 #define flush_cache_vunmap(start, end) flush_cache_all()
53 #define flush_cache_dup_mm(mm) /* called on fork (VIVT only) */
55 #ifndef CONFIG_ARC_CACHE_VIPT_ALIASING
57 #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 */
61 #else /* VIPT aliasing dcache */
63 /* To clear out stale userspace mappings */
64 void flush_cache_mm(struct mm_struct *mm);
65 void flush_cache_range(struct vm_area_struct *vma,
66 unsigned long start,unsigned long end);
67 void flush_cache_page(struct vm_area_struct *vma,
68 unsigned long user_addr, unsigned long page);
71 * To make sure that userspace mapping is flushed to memory before
72 * get_user_pages() uses a kernel mapping to access the page
74 #define ARCH_HAS_FLUSH_ANON_PAGE
75 void flush_anon_page(struct vm_area_struct *vma,
76 struct page *page, unsigned long u_vaddr);
78 #endif /* CONFIG_ARC_CACHE_VIPT_ALIASING */
81 * Simple wrapper over config option
82 * Bootup code ensures that hardware matches kernel configuration
84 static inline int cache_is_vipt_aliasing(void)
86 #ifdef CONFIG_ARC_CACHE_VIPT_ALIASING
93 #define CACHE_COLOR(addr) (((unsigned long)(addr) >> (PAGE_SHIFT)) & 3)
96 * checks if two addresses (after page aligning) index into same cache set
98 #define addr_not_cache_congruent(addr1, addr2) \
99 cache_is_vipt_aliasing() ? \
100 (CACHE_COLOR(addr1) != CACHE_COLOR(addr2)) : 0 \
102 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
104 memcpy(dst, src, len); \
105 if (vma->vm_flags & VM_EXEC) \
106 __sync_icache_dcache((unsigned long)(dst), vaddr, len); \
109 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
110 memcpy(dst, src, len); \