include/asm-frv/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_range(mm, start, end)       do {} while(0)
  24 #define flush_cache_page(vma, vmaddr, pfn)      do {} while(0)
  25 #define flush_cache_vmap(start, end)            do {} while(0)
  26 #define flush_cache_vunmap(start, end)          do {} while(0)
  27 #define flush_dcache_mmap_lock(mapping)         do {} while(0)
  28 #define flush_dcache_mmap_unlock(mapping)       do {} while(0)
  29
  30 /*
  31  * physically-indexed cache managment
  32  * - see arch/frv/lib/cache.S
  33  */
  34 extern void frv_dcache_writeback(unsigned long start, unsigned long size);
  35 extern void frv_cache_invalidate(unsigned long start, unsigned long size);
  36 extern void frv_icache_invalidate(unsigned long start, unsigned long size);
  37 extern void frv_cache_wback_inv(unsigned long start, unsigned long size);
  38
  39 static inline void __flush_cache_all(void)
  40 {
  41         asm volatile("  dcef    @(gr0,gr0),#1   \n"
  42                      "  icei    @(gr0,gr0),#1   \n"
  43                      "  membar                  \n"
  44                      : : : "memory"
  45                      );
  46 }
  47
  48 /* dcache/icache coherency... */
  49 #ifdef CONFIG_MMU
  50 extern void flush_dcache_page(struct page *page);
  51 #else
  52 static inline void flush_dcache_page(struct page *page)
  53 {
  54         unsigned long addr = page_to_phys(page);
  55         frv_dcache_writeback(addr, addr + PAGE_SIZE);
  56 }
  57 #endif
  58
  59 static inline void flush_page_to_ram(struct page *page)
  60 {
  61         flush_dcache_page(page);
  62 }
  63
  64 static inline void flush_icache(void)
  65 {
  66         __flush_cache_all();
  67 }
  68
  69 static inline void flush_icache_range(unsigned long start, unsigned long end)
  70 {
  71         frv_cache_wback_inv(start, end);
  72 }
  73
  74 #ifdef CONFIG_MMU
  75 extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  76                                     unsigned long start, unsigned long len);
  77 #else
  78 static inline void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  79                                            unsigned long start, unsigned long len)
  80 {
  81         frv_cache_wback_inv(start, start + len);
  82 }
  83 #endif
  84
  85 static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page)
  86 {
  87         flush_icache_user_range(vma, page, page_to_phys(page), PAGE_SIZE);
  88 }
  89
  90 /*
  91  * permit ptrace to access another process's address space through the icache
  92  * and the dcache
  93  */
  94 #define copy_to_user_page(vma, page, vaddr, dst, src, len)      \
  95 do {                                                            \
  96         memcpy((dst), (src), (len));                            \
  97         flush_icache_user_range((vma), (page), (vaddr), (len)); \
  98 } while(0)
  99
 100 #define copy_from_user_page(vma, page, vaddr, dst, src, len)    \
 101         memcpy((dst), (src), (len))
 102
 103 #endif /* _ASM_CACHEFLUSH_H */