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Linux/arch/sh/mm/kmap.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * arch/sh/mm/kmap.c
  4  *
  5  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
  6  * Copyright (C) 2002 - 2009  Paul Mundt
  7  */
  8 #include <linux/mm.h>
  9 #include <linux/init.h>
 10 #include <linux/mutex.h>
 11 #include <linux/fs.h>
 12 #include <linux/highmem.h>
 13 #include <linux/module.h>
 14 #include <asm/mmu_context.h>
 15 #include <asm/cacheflush.h>
 16 
 17 static pte_t *kmap_coherent_pte;
 18 
 19 void __init kmap_coherent_init(void)
 20 {
 21         unsigned long vaddr;
 22 
 23         /* cache the first coherent kmap pte */
 24         vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
 25         kmap_coherent_pte = virt_to_kpte(vaddr);
 26 }
 27 
 28 void *kmap_coherent(struct page *page, unsigned long addr)
 29 {
 30         enum fixed_addresses idx;
 31         unsigned long vaddr;
 32 
 33         BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
 34 
 35         preempt_disable();
 36         pagefault_disable();
 37 
 38         idx = FIX_CMAP_END -
 39                 (((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
 40                  (FIX_N_COLOURS * smp_processor_id()));
 41 
 42         vaddr = __fix_to_virt(idx);
 43 
 44         BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
 45         set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
 46 
 47         return (void *)vaddr;
 48 }
 49 
 50 void kunmap_coherent(void *kvaddr)
 51 {
 52         if (kvaddr >= (void *)FIXADDR_START) {
 53                 unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
 54                 enum fixed_addresses idx = __virt_to_fix(vaddr);
 55 
 56                 /* XXX.. Kill this later, here for sanity at the moment.. */
 57                 __flush_purge_region((void *)vaddr, PAGE_SIZE);
 58 
 59                 pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
 60                 local_flush_tlb_one(get_asid(), vaddr);
 61         }
 62 
 63         pagefault_enable();
 64         preempt_enable();
 65 }
 66 

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