projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 6bc9a396 CL |
2 | #ifndef _ASM_SCORE_MMU_CONTEXT_H |
| 3 | #define _ASM_SCORE_MMU_CONTEXT_H | |
| 4 | ||
| 5 | #include <linux/errno.h> | |
| 6 | #include <linux/sched.h> | |
| 589ee628 | 7 | #include <linux/mm_types.h> |
| 6bc9a396 | 8 | #include <linux/slab.h> |
| 589ee628 | 9 | |
| 6bc9a396 CL |
10 | #include <asm-generic/mm_hooks.h> |
| 11 | ||
| 12 | #include <asm/cacheflush.h> | |
| 13 | #include <asm/tlbflush.h> | |
| 14 | #include <asm/scoreregs.h> | |
| 15 | ||
| 16 | /* | |
| 17 | * For the fast tlb miss handlers, we keep a per cpu array of pointers | |
| 18 | * to the current pgd for each processor. Also, the proc. id is stuffed | |
| 19 | * into the context register. | |
| 20 | */ | |
| 21 | extern unsigned long asid_cache; | |
| 22 | extern unsigned long pgd_current; | |
| 23 | ||
| 24 | #define TLBMISS_HANDLER_SETUP_PGD(pgd) (pgd_current = (unsigned long)(pgd)) | |
| 25 | ||
| 26 | #define TLBMISS_HANDLER_SETUP() \ | |
| 27 | do { \ | |
| 28 | write_c0_context(0); \ | |
| 29 | TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) \ | |
| 30 | } while (0) | |
| 31 | ||
| 32 | /* | |
| 33 | * All unused by hardware upper bits will be considered | |
| 34 | * as a software asid extension. | |
| 35 | */ | |
| 36 | #define ASID_VERSION_MASK 0xfffff000 | |
| 37 | #define ASID_FIRST_VERSION 0x1000 | |
| 38 | ||
| 39 | /* PEVN --------- VPN ---------- --ASID--- -NA- */ | |
| 40 | /* binary: 0000 0000 0000 0000 0000 0000 0001 0000 */ | |
| 41 | /* binary: 0000 0000 0000 0000 0000 1111 1111 0000 */ | |
| 42 | #define ASID_INC 0x10 | |
| 43 | #define ASID_MASK 0xff0 | |
| 44 | ||
| 45 | static inline void enter_lazy_tlb(struct mm_struct *mm, | |
| 46 | struct task_struct *tsk) | |
| 47 | {} | |
| 48 | ||
| 49 | static inline void | |
| 50 | get_new_mmu_context(struct mm_struct *mm) | |
| 51 | { | |
| 52 | unsigned long asid = asid_cache + ASID_INC; | |
| 53 | ||
| 54 | if (!(asid & ASID_MASK)) { | |
| 55 | local_flush_tlb_all(); /* start new asid cycle */ | |
| 56 | if (!asid) /* fix version if needed */ | |
| 57 | asid = ASID_FIRST_VERSION; | |
| 58 | } | |
| 59 | ||
| 60 | mm->context = asid; | |
| 61 | asid_cache = asid; | |
| 62 | } | |
| 63 | ||
| 64 | /* | |
| 65 | * Initialize the context related info for a new mm_struct | |
| 66 | * instance. | |
| 67 | */ | |
| 68 | static inline int | |
| 69 | init_new_context(struct task_struct *tsk, struct mm_struct *mm) | |
| 70 | { | |
| 71 | mm->context = 0; | |
| 72 | return 0; | |
| 73 | } | |
| 74 | ||
| 75 | static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
| 76 | struct task_struct *tsk) | |
| 77 | { | |
| 78 | unsigned long flags; | |
| 79 | ||
| 80 | local_irq_save(flags); | |
| 81 | if ((next->context ^ asid_cache) & ASID_VERSION_MASK) | |
| 82 | get_new_mmu_context(next); | |
| 83 | ||
| 84 | pevn_set(next->context); | |
| 85 | TLBMISS_HANDLER_SETUP_PGD(next->pgd); | |
| 86 | local_irq_restore(flags); | |
| 87 | } | |
| 88 | ||
| 89 | /* | |
| 90 | * Destroy context related info for an mm_struct that is about | |
| 91 | * to be put to rest. | |
| 92 | */ | |
| 93 | static inline void destroy_context(struct mm_struct *mm) | |
| 94 | {} | |
| 95 | ||
| 96 | static inline void | |
| 97 | deactivate_mm(struct task_struct *task, struct mm_struct *mm) | |
| 98 | {} | |
| 99 | ||
| 100 | /* | |
| 101 | * After we have set current->mm to a new value, this activates | |
| 102 | * the context for the new mm so we see the new mappings. | |
| 103 | */ | |
| 104 | static inline void | |
| 105 | activate_mm(struct mm_struct *prev, struct mm_struct *next) | |
| 106 | { | |
| 107 | unsigned long flags; | |
| 108 | ||
| 109 | local_irq_save(flags); | |
| 110 | get_new_mmu_context(next); | |
| 111 | pevn_set(next->context); | |
| 112 | TLBMISS_HANDLER_SETUP_PGD(next->pgd); | |
| 113 | local_irq_restore(flags); | |
| 114 | } | |
| 115 | ||
| 116 | #endif /* _ASM_SCORE_MMU_CONTEXT_H */ |