1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_SCORE_MMU_CONTEXT_H
3 #define _ASM_SCORE_MMU_CONTEXT_H
5 #include <linux/errno.h>
6 #include <linux/sched.h>
7 #include <linux/mm_types.h>
8 #include <linux/slab.h>
10 #include <asm-generic/mm_hooks.h>
12 #include <asm/cacheflush.h>
13 #include <asm/tlbflush.h>
14 #include <asm/scoreregs.h>
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.
21 extern unsigned long asid_cache;
22 extern unsigned long pgd_current;
24 #define TLBMISS_HANDLER_SETUP_PGD(pgd) (pgd_current = (unsigned long)(pgd))
26 #define TLBMISS_HANDLER_SETUP() \
28 write_c0_context(0); \
29 TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) \
33 * All unused by hardware upper bits will be considered
34 * as a software asid extension.
36 #define ASID_VERSION_MASK 0xfffff000
37 #define ASID_FIRST_VERSION 0x1000
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 */
43 #define ASID_MASK 0xff0
45 static inline void enter_lazy_tlb(struct mm_struct *mm,
46 struct task_struct *tsk)
50 get_new_mmu_context(struct mm_struct *mm)
52 unsigned long asid = asid_cache + ASID_INC;
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;
65 * Initialize the context related info for a new mm_struct
69 init_new_context(struct task_struct *tsk, struct mm_struct *mm)
75 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
76 struct task_struct *tsk)
80 local_irq_save(flags);
81 if ((next->context ^ asid_cache) & ASID_VERSION_MASK)
82 get_new_mmu_context(next);
84 pevn_set(next->context);
85 TLBMISS_HANDLER_SETUP_PGD(next->pgd);
86 local_irq_restore(flags);
90 * Destroy context related info for an mm_struct that is about
93 static inline void destroy_context(struct mm_struct *mm)
97 deactivate_mm(struct task_struct *task, struct mm_struct *mm)
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.
105 activate_mm(struct mm_struct *prev, struct mm_struct *next)
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);
116 #endif /* _ASM_SCORE_MMU_CONTEXT_H */