arch/csky/abiv2/cacheflush.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4 #include <linux/cache.h>
   5 #include <linux/highmem.h>
   6 #include <linux/mm.h>
   7 #include <asm/cache.h>
   8
   9 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
  10 {
  11         unsigned long start;
  12
  13         start = (unsigned long) kmap_atomic(page);
  14
  15         cache_wbinv_range(start, start + PAGE_SIZE);
  16
  17         kunmap_atomic((void *)start);
  18 }
  19
  20 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
  21                              unsigned long vaddr, int len)
  22 {
  23         unsigned long kaddr;
  24
  25         kaddr = (unsigned long) kmap_atomic(page) + (vaddr & ~PAGE_MASK);
  26
  27         cache_wbinv_range(kaddr, kaddr + len);
  28
  29         kunmap_atomic((void *)kaddr);
  30 }
  31
  32 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
  33                       pte_t *pte)
  34 {
  35         unsigned long addr, pfn;
  36         struct page *page;
  37         void *va;
  38
  39         if (!(vma->vm_flags & VM_EXEC))
  40                 return;
  41
  42         pfn = pte_pfn(*pte);
  43         if (unlikely(!pfn_valid(pfn)))
  44                 return;
  45
  46         page = pfn_to_page(pfn);
  47         if (page == ZERO_PAGE(0))
  48                 return;
  49
  50         va = page_address(page);
  51         addr = (unsigned long) va;
  52
  53         if (va == NULL && PageHighMem(page))
  54                 addr = (unsigned long) kmap_atomic(page);
  55
  56         cache_wbinv_range(addr, addr + PAGE_SIZE);
  57
  58         if (va == NULL && PageHighMem(page))
  59                 kunmap_atomic((void *) addr);
  60 }