root/arch/openrisc/include/asm/cacheflush.h

INCLUDED FROM

DEFINITIONS

1. sync_icache_dcache
2. flush_dcache_page

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * OpenRISC Linux
   4  *
   5  * Linux architectural port borrowing liberally from similar works of
   6  * others.  All original copyrights apply as per the original source
   7  * declaration.
   8  *
   9  * OpenRISC implementation:
  10  * Copyright (C) Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
  11  * et al.
  12  */
  13 
  14 #ifndef __ASM_CACHEFLUSH_H
  15 #define __ASM_CACHEFLUSH_H
  16 
  17 #include <linux/mm.h>
  18 
  19 /*
  20  * Helper function for flushing or invalidating entire pages from data
  21  * and instruction caches. SMP needs a little extra work, since we need
  22  * to flush the pages on all cpus.
  23  */
  24 extern void local_dcache_page_flush(struct page *page);
  25 extern void local_icache_page_inv(struct page *page);
  26 
  27 /*
  28  * Data cache flushing always happen on the local cpu. Instruction cache
  29  * invalidations need to be broadcasted to all other cpu in the system in
  30  * case of SMP configurations.
  31  */
  32 #ifndef CONFIG_SMP
  33 #define dcache_page_flush(page)      local_dcache_page_flush(page)
  34 #define icache_page_inv(page)        local_icache_page_inv(page)
  35 #else  /* CONFIG_SMP */
  36 #define dcache_page_flush(page)      local_dcache_page_flush(page)
  37 #define icache_page_inv(page)        smp_icache_page_inv(page)
  38 extern void smp_icache_page_inv(struct page *page);
  39 #endif /* CONFIG_SMP */
  40 
  41 /*
  42  * Synchronizes caches. Whenever a cpu writes executable code to memory, this
  43  * should be called to make sure the processor sees the newly written code.
  44  */
  45 static inline void sync_icache_dcache(struct page *page)
  46 {
  47         if (!IS_ENABLED(CONFIG_DCACHE_WRITETHROUGH))
  48                 dcache_page_flush(page);
  49         icache_page_inv(page);
  50 }
  51 
  52 /*
  53  * Pages with this bit set need not be flushed/invalidated, since
  54  * they have not changed since last flush. New pages start with
  55  * PG_arch_1 not set and are therefore dirty by default.
  56  */
  57 #define PG_dc_clean                  PG_arch_1
  58 
  59 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
  60 static inline void flush_dcache_page(struct page *page)
  61 {
  62         clear_bit(PG_dc_clean, &page->flags);
  63 }
  64 
  65 /*
  66  * Other interfaces are not required since we do not have virtually
  67  * indexed or tagged caches. So we can use the default here.
  68  */
  69 #define flush_cache_all()                               do { } while (0)
  70 #define flush_cache_mm(mm)                              do { } while (0)
  71 #define flush_cache_dup_mm(mm)                          do { } while (0)
  72 #define flush_cache_range(vma, start, end)              do { } while (0)
  73 #define flush_cache_page(vma, vmaddr, pfn)              do { } while (0)
  74 #define flush_dcache_mmap_lock(mapping)                 do { } while (0)
  75 #define flush_dcache_mmap_unlock(mapping)               do { } while (0)
  76 #define flush_icache_range(start, end)                  do { } while (0)
  77 #define flush_icache_page(vma, pg)                      do { } while (0)
  78 #define flush_icache_user_range(vma, pg, adr, len)      do { } while (0)
  79 #define flush_cache_vmap(start, end)                    do { } while (0)
  80 #define flush_cache_vunmap(start, end)                  do { } while (0)
  81 
  82 #define copy_to_user_page(vma, page, vaddr, dst, src, len)           \
  83         do {                                                         \
  84                 memcpy(dst, src, len);                               \
  85                 if (vma->vm_flags & VM_EXEC)                         \
  86                         sync_icache_dcache(page);                    \
  87         } while (0)
  88 
  89 #define copy_from_user_page(vma, page, vaddr, dst, src, len)         \
  90         memcpy(dst, src, len)
  91 
  92 #endif /* __ASM_CACHEFLUSH_H */