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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __PARISC_MMU_CONTEXT_H #define __PARISC_MMU_CONTEXT_H #include <linux/mm.h> #include <linux/sched.h> #include <linux/atomic.h> #include <linux/spinlock.h> #include <asm-generic/mm_hooks.h> /* on PA-RISC, we actually have enough contexts to justify an allocator * for them. prumpf */ extern unsigned long alloc_sid(void); extern void free_sid(unsigned long); #define init_new_context init_new_context static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { BUG_ON(atomic_read(&mm->mm_users) != 1); mm->context = alloc_sid(); return 0; } #define destroy_context destroy_context static inline void destroy_context(struct mm_struct *mm) { free_sid(mm->context); mm->context = 0; } static inline unsigned long __space_to_prot(mm_context_t context) { #if SPACEID_SHIFT == 0 return context << 1; #else return context >> (SPACEID_SHIFT - 1); #endif } static inline void load_context(mm_context_t context) { mtsp(context, 3); mtctl(__space_to_prot(context), 8); } static inline void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { if (prev != next) { #ifdef CONFIG_TLB_PTLOCK /* put physical address of page_table_lock in cr28 (tr4) for TLB faults */ spinlock_t *pgd_lock = &next->page_table_lock; mtctl(__pa(__ldcw_align(&pgd_lock->rlock.raw_lock)), 28); #endif mtctl(__pa(next->pgd), 25); load_context(next->context); } } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned long flags; if (prev == next) return; local_irq_save(flags); switch_mm_irqs_off(prev, next, tsk); local_irq_restore(flags); } #define switch_mm_irqs_off switch_mm_irqs_off #define activate_mm activate_mm static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) { /* * Activate_mm is our one chance to allocate a space id * for a new mm created in the exec path. There's also * some lazy tlb stuff, which is currently dead code, but * we only allocate a space id if one hasn't been allocated * already, so we should be OK. */ BUG_ON(next == &init_mm); /* Should never happen */ if (next->context == 0) next->context = alloc_sid(); switch_mm(prev,next,current); } #include <asm-generic/mmu_context.h> #endif