arch/metag/include/asm/mmu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __MMU_H
   3 #define __MMU_H
   4
   5 #ifdef CONFIG_METAG_USER_TCM
   6 #include <linux/list.h>
   7 #endif
   8
   9 #ifdef CONFIG_HUGETLB_PAGE
  10 #include <asm/page.h>
  11 #endif
  12
  13 typedef struct {
  14         /* Software pgd base pointer used for Meta 1.x MMU. */
  15         unsigned long pgd_base;
  16 #ifdef CONFIG_METAG_USER_TCM
  17         struct list_head tcm;
  18 #endif
  19 #ifdef CONFIG_HUGETLB_PAGE
  20 #if HPAGE_SHIFT < HUGEPT_SHIFT
  21         /* last partially filled huge page table address */
  22         unsigned long part_huge;
  23 #endif
  24 #endif
  25 } mm_context_t;
  26
  27 /* Given a virtual address, return the pte for the top level 4meg entry
  28  * that maps that address.
  29  * Returns 0 (an empty pte) if that range is not mapped.
  30  */
  31 unsigned long mmu_read_first_level_page(unsigned long vaddr);
  32
  33 /* Given a linear (virtual) address, return the second level 4k pte
  34  * that maps that address.  Returns 0 if the address is not mapped.
  35  */
  36 unsigned long mmu_read_second_level_page(unsigned long vaddr);
  37
  38 /* Get the virtual base address of the MMU */
  39 unsigned long mmu_get_base(void);
  40
  41 /* Initialize the MMU. */
  42 void mmu_init(unsigned long mem_end);
  43
  44 #ifdef CONFIG_METAG_META21_MMU
  45 /*
  46  * For cpu "cpu" calculate and return the address of the
  47  * MMCU_TnLOCAL_TABLE_PHYS0 if running in local-space or
  48  * MMCU_TnGLOBAL_TABLE_PHYS0 if running in global-space.
  49  */
  50 static inline unsigned long mmu_phys0_addr(unsigned int cpu)
  51 {
  52         unsigned long phys0;
  53
  54         phys0 = (MMCU_T0LOCAL_TABLE_PHYS0 +
  55                 (MMCU_TnX_TABLE_PHYSX_STRIDE * cpu)) +
  56                 (MMCU_TXG_TABLE_PHYSX_OFFSET * is_global_space(PAGE_OFFSET));
  57
  58         return phys0;
  59 }
  60
  61 /*
  62  * For cpu "cpu" calculate and return the address of the
  63  * MMCU_TnLOCAL_TABLE_PHYS1 if running in local-space or
  64  * MMCU_TnGLOBAL_TABLE_PHYS1 if running in global-space.
  65  */
  66 static inline unsigned long mmu_phys1_addr(unsigned int cpu)
  67 {
  68         unsigned long phys1;
  69
  70         phys1 = (MMCU_T0LOCAL_TABLE_PHYS1 +
  71                 (MMCU_TnX_TABLE_PHYSX_STRIDE * cpu)) +
  72                 (MMCU_TXG_TABLE_PHYSX_OFFSET * is_global_space(PAGE_OFFSET));
  73
  74         return phys1;
  75 }
  76 #endif /* CONFIG_METAG_META21_MMU */
  77
  78 #endif