1#ifndef __ASM_POWERPC_MMU_CONTEXT_H 2#define __ASM_POWERPC_MMU_CONTEXT_H 3#ifdef __KERNEL__ 4 5#ifndef CONFIG_PPC64 6#include <asm-ppc/mmu_context.h> 7#else 8 9#include <linux/kernel.h> 10#include <linux/mm.h> 11#include <linux/sched.h> 12#include <asm/mmu.h> 13#include <asm/cputable.h> 14#include <asm-generic/mm_hooks.h> 15 16/* 17 * Copyright (C) 2001 PPC 64 Team, IBM Corp 18 * 19 * This program is free software; you can redistribute it and/or 20 * modify it under the terms of the GNU General Public License 21 * as published by the Free Software Foundation; either version 22 * 2 of the License, or (at your option) any later version. 23 */ 24 25static inline void enter_lazy_tlb(struct mm_struct *mm, 26 struct task_struct *tsk) 27{ 28} 29 30/* 31 * The proto-VSID space has 2^35 - 1 segments available for user mappings. 32 * Each segment contains 2^28 bytes. Each context maps 2^44 bytes, 33 * so we can support 2^19-1 contexts (19 == 35 + 28 - 44). 34 */ 35#define NO_CONTEXT 0 36#define MAX_CONTEXT ((1UL << 19) - 1) 37 38extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 39extern void destroy_context(struct mm_struct *mm); 40 41extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); 42extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 43 44/* 45 * switch_mm is the entry point called from the architecture independent 46 * code in kernel/sched.c 47 */ 48static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 49 struct task_struct *tsk) 50{ 51 if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask)) 52 cpu_set(smp_processor_id(), next->cpu_vm_mask); 53 54 /* No need to flush userspace segments if the mm doesnt change */ 55 if (prev == next) 56 return; 57 58#ifdef CONFIG_ALTIVEC 59 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 60 asm volatile ("dssall"); 61#endif /* CONFIG_ALTIVEC */ 62 63 if (cpu_has_feature(CPU_FTR_SLB)) 64 switch_slb(tsk, next); 65 else 66 switch_stab(tsk, next); 67} 68 69#define deactivate_mm(tsk,mm) do { } while (0) 70 71/* 72 * After we have set current->mm to a new value, this activates 73 * the context for the new mm so we see the new mappings. 74 */ 75static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 76{ 77 unsigned long flags; 78 79 local_irq_save(flags); 80 switch_mm(prev, next, current); 81 local_irq_restore(flags); 82} 83 84#endif /* CONFIG_PPC64 */ 85#endif /* __KERNEL__ */ 86#endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 87