arch/frv/include/asm/cacheflush.h

   1 /* cacheflush.h: FRV cache flushing routines
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_CACHEFLUSH_H
  13 #define _ASM_CACHEFLUSH_H
  14
  15 /* Keep includes the same across arches.  */
  16 #include <linux/mm.h>
  17
  18 /*
  19  * virtually-indexed cache management (our cache is physically indexed)
  20  */
  21 #define flush_cache_all()                       do {} while(0)
  22 #define flush_cache_mm(mm)                      do {} while(0)
  23 #define flush_cache_dup_mm(mm)                  do {} while(0)
  24 #define flush_cache_range(mm, start, end)       do {} while(0)
  25 #define flush_cache_page(vma, vmaddr, pfn)      do {} while(0)
  26 #define flush_cache_vmap(start, end)            do {} while(0)
  27 #define flush_cache_vunmap(start, end)          do {} while(0)
  28 #define flush_dcache_mmap_lock(mapping)         do {} while(0)
  29 #define flush_dcache_mmap_unlock(mapping)       do {} while(0)
  30
  31 /*
  32  * physically-indexed cache management
  33  * - see arch/frv/lib/cache.S
  34  */
  35 extern void frv_dcache_writeback(unsigned long start, unsigned long size);
  36 extern void frv_cache_invalidate(unsigned long start, unsigned long size);
  37 extern void frv_icache_invalidate(unsigned long start, unsigned long size);
  38 extern void frv_cache_wback_inv(unsigned long start, unsigned long size);
  39
  40 static inline void __flush_cache_all(void)
  41 {
  42         asm volatile("  dcef    @(gr0,gr0),#1   \n"
  43                      "  icei    @(gr0,gr0),#1   \n"
  44                      "  membar                  \n"
  45                      : : : "memory"
  46                      );
  47 }
  48
  49 /* dcache/icache coherency... */
  50 #ifdef CONFIG_MMU
  51 extern void flush_dcache_page(struct page *page);
  52 #else
  53 static inline void flush_dcache_page(struct page *page)
  54 {
  55         unsigned long addr = page_to_phys(page);
  56         frv_dcache_writeback(addr, addr + PAGE_SIZE);
  57 }
  58 #endif
  59
  60 static inline void flush_page_to_ram(struct page *page)
  61 {
  62         flush_dcache_page(page);
  63 }
  64
  65 static inline void flush_icache(void)
  66 {
  67         __flush_cache_all();
  68 }
  69
  70 static inline void flush_icache_range(unsigned long start, unsigned long end)
  71 {
  72         frv_cache_wback_inv(start, end);
  73 }
  74
  75 #ifdef CONFIG_MMU
  76 extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  77                                     unsigned long start, unsigned long len);
  78 #else
  79 static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  80                                            unsigned long start, unsigned long len)
  81 {
  82         frv_cache_wback_inv(start, start + len);
  83 }
  84 #endif
  85
  86 static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
  87 {
  88         flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
  89 }
  90
  91 /*
  92  * permit ptrace to access another process's address space through the icache
  93  * and the dcache
  94  */
  95 #define copy_to_user_page(vma, page, vaddr, dst, src, len)      \
  96 do {                                                            \
  97         memcpy((dst), (src), (len));                            \
  98         flush_icache_user_range((vma), (page), (vaddr), (len)); \
  99 } while(0)
 100
 101 #define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
 102         memcpy((dst), (src), (len))
 103
 104 #endif /* _ASM_CACHEFLUSH_H */