arch/hexagon/include/asm/cacheflush.h

   1 /*
   2  * Cache flush operations for the Hexagon architecture
   3  *
   4  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 and
   8  * only version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA.
  19  */
  20
  21 #ifndef _ASM_CACHEFLUSH_H
  22 #define _ASM_CACHEFLUSH_H
  23
  24 #include <linux/cache.h>
  25 #include <linux/mm.h>
  26 #include <asm/string.h>
  27 #include <asm-generic/cacheflush.h>
  28
  29 /* Cache flushing:
  30  *
  31  *  - flush_cache_all() flushes entire cache
  32  *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
  33  *  - flush_cache_page(mm, vmaddr, pfn) flushes a single page
  34  *  - flush_cache_range(vma, start, end) flushes a range of pages
  35  *  - flush_icache_range(start, end) flush a range of instructions
  36  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
  37  *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
  38  *
  39  *  Need to doublecheck which one is really needed for ptrace stuff to work.
  40  */
  41 #define LINESIZE        32
  42 #define LINEBITS        5
  43
  44 /*
  45  * Flush Dcache range through current map.
  46  */
  47 extern void flush_dcache_range(unsigned long start, unsigned long end);
  48
  49 /*
  50  * Flush Icache range through current map.
  51  */
  52 #undef flush_icache_range
  53 extern void flush_icache_range(unsigned long start, unsigned long end);
  54
  55 /*
  56  * Memory-management related flushes are there to ensure in non-physically
  57  * indexed cache schemes that stale lines belonging to a given ASID aren't
  58  * in the cache to confuse things.  The prototype Hexagon Virtual Machine
  59  * only uses a single ASID for all user-mode maps, which should
  60  * mean that they aren't necessary.  A brute-force, flush-everything
  61  * implementation, with the name xxxxx_hexagon() is present in
  62  * arch/hexagon/mm/cache.c, but let's not wire it up until we know
  63  * it is needed.
  64  */
  65 extern void flush_cache_all_hexagon(void);
  66
  67 /*
  68  * This may or may not ever have to be non-null, depending on the
  69  * virtual machine MMU.  For a native kernel, it's definitiely  a no-op
  70  *
  71  * This is also the place where deferred cache coherency stuff seems
  72  * to happen, classically...  but instead we do it like ia64 and
  73  * clean the cache when the PTE is set.
  74  *
  75  */
  76 static inline void update_mmu_cache(struct vm_area_struct *vma,
  77                                         unsigned long address, pte_t *ptep)
  78 {
  79         /*  generic_ptrace_pokedata doesn't wind up here, does it?  */
  80 }
  81
  82 #undef copy_to_user_page
  83 static inline void copy_to_user_page(struct vm_area_struct *vma,
  84                                              struct page *page,
  85                                              unsigned long vaddr,
  86                                              void *dst, void *src, int len)
  87 {
  88         memcpy(dst, src, len);
  89         if (vma->vm_flags & VM_EXEC) {
  90                 flush_icache_range((unsigned long) dst,
  91                 (unsigned long) dst + len);
  92         }
  93 }
  94
  95
  96 extern void hexagon_inv_dcache_range(unsigned long start, unsigned long end);
  97 extern void hexagon_clean_dcache_range(unsigned long start, unsigned long end);
  98
  99 #endif