1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * MM context support for the Hexagon architecture 4 * 5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. 6 */ 7 8 #ifndef _ASM_MMU_CONTEXT_H 9 #define _ASM_MMU_CONTEXT_H 10 11 #include <linux/mm_types.h> 12 13 #include <asm/setup.h> 14 #include <asm/page.h> 15 #include <asm/pgalloc.h> 16 #include <asm/mem-layout.h> 17 18 /* 19 * VM port hides all TLB management, so "lazy TLB" isn't very 20 * meaningful. Even for ports to architectures with visble TLBs, 21 * this is almost invariably a null function. 22 * 23 * mm->context is set up by pgd_alloc, so no init_new_context required. 24 */ 25 26 /* 27 * Switch active mm context 28 */ 29 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 30 struct task_struct *tsk) 31 { 32 int l1; 33 34 /* 35 * For virtual machine, we have to update system map if it's been 36 * touched. 37 */ 38 if (next->context.generation < prev->context.generation) { 39 for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++) 40 next->pgd[l1] = init_mm.pgd[l1]; 41 42 next->context.generation = prev->context.generation; 43 } 44 45 __vmnewmap((void *)next->context.ptbase); 46 } 47 48 /* 49 * Activate new memory map for task 50 */ 51 #define activate_mm activate_mm 52 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 53 { 54 unsigned long flags; 55 56 local_irq_save(flags); 57 switch_mm(prev, next, current_thread_info()->task); 58 local_irq_restore(flags); 59 } 60 61 /* Generic hooks for arch_dup_mmap and arch_exit_mmap */ 62 #include <asm-generic/mm_hooks.h> 63 64 #include <asm-generic/mmu_context.h> 65 66 #endif 67