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