arch/csky/include/asm/highmem.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef __ASM_CSKY_HIGHMEM_H
   4 #define __ASM_CSKY_HIGHMEM_H
   5
   6 #ifdef __KERNEL__
   7
   8 #include <linux/init.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/uaccess.h>
  11 #include <asm/kmap_size.h>
  12 #include <asm/cache.h>
  13
  14 /* undef for production */
  15 #define HIGHMEM_DEBUG 1
  16
  17 /* declarations for highmem.c */
  18 extern unsigned long highstart_pfn, highend_pfn;
  19
  20 extern pte_t *pkmap_page_table;
  21
  22 /*
  23  * Right now we initialize only a single pte table. It can be extended
  24  * easily, subsequent pte tables have to be allocated in one physical
  25  * chunk of RAM.
  26  */
  27 #define LAST_PKMAP 1024
  28 #define LAST_PKMAP_MASK (LAST_PKMAP-1)
  29 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
  30 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
  31
  32 #define ARCH_HAS_KMAP_FLUSH_TLB
  33 extern void kmap_flush_tlb(unsigned long addr);
  34
  35 #define flush_cache_kmaps() do {} while (0)
  36
  37 #define arch_kmap_local_post_map(vaddr, pteval) kmap_flush_tlb(vaddr)
  38 #define arch_kmap_local_post_unmap(vaddr)       kmap_flush_tlb(vaddr)
  39
  40 extern void kmap_init(void);
  41
  42 #endif /* __KERNEL__ */
  43
  44 #endif /* __ASM_CSKY_HIGHMEM_H */