arch/parisc/include/asm/fixmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_FIXMAP_H
   3 #define _ASM_FIXMAP_H
   4
   5 /*
   6  * This file defines the locations of the fixed mappings on parisc.
   7  *
   8  * All of the values in this file are machine virtual addresses.
   9  *
  10  * All of the values in this file must be <4GB (because of assembly
  11  * loading restrictions).  If you place this region anywhere above
  12  * __PAGE_OFFSET, you must adjust the memory map accordingly */
  13
  14 /* The alias region is used in kernel space to do copy/clear to or
  15  * from areas congruently mapped with user space.  It is 8MB large
  16  * and must be 16MB aligned */
  17 #define TMPALIAS_MAP_START      ((__PAGE_OFFSET) - 16*1024*1024)
  18
  19 #define FIXMAP_SIZE             (FIX_BITMAP_COUNT << PAGE_SHIFT)
  20 #define FIXMAP_START            (TMPALIAS_MAP_START - FIXMAP_SIZE)
  21 /* This is the kernel area for all maps (vmalloc, dma etc.)  most
  22  * usually, it extends up to TMPALIAS_MAP_START.  Virtual addresses
  23  * 0..GATEWAY_PAGE_SIZE are reserved for the gateway page */
  24 #define KERNEL_MAP_START        (GATEWAY_PAGE_SIZE)
  25 #define KERNEL_MAP_END          (FIXMAP_START)
  26
  27 #ifndef __ASSEMBLY__
  28
  29
  30 enum fixed_addresses {
  31         /* Support writing RO kernel text via kprobes, jump labels, etc. */
  32         FIX_TEXT_POKE0,
  33         FIX_TEXT_KEXEC,
  34         FIX_BITMAP_COUNT
  35 };
  36
  37 extern void *parisc_vmalloc_start;
  38 #define PCXL_DMA_MAP_SIZE       (8*1024*1024)
  39 #define VMALLOC_START           ((unsigned long)parisc_vmalloc_start)
  40 #define VMALLOC_END             (KERNEL_MAP_END)
  41
  42 #define __fix_to_virt(_x) (FIXMAP_START + ((_x) << PAGE_SHIFT))
  43
  44 void set_fixmap(enum fixed_addresses idx, phys_addr_t phys);
  45 void clear_fixmap(enum fixed_addresses idx);
  46
  47 #endif /*__ASSEMBLY__*/
  48
  49 #endif /*_ASM_FIXMAP_H*/