| #ifndef __ASM_POWERPC_MMU_CONTEXT_H |
| #define __ASM_POWERPC_MMU_CONTEXT_H |
| #ifdef __KERNEL__ |
| |
| #ifndef CONFIG_PPC64 |
| #include <asm-ppc/mmu_context.h> |
| #else |
| |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/sched.h> |
| #include <asm/mmu.h> |
| #include <asm/cputable.h> |
| #include <asm-generic/mm_hooks.h> |
| |
| /* |
| * Copyright (C) 2001 PPC 64 Team, IBM Corp |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| static inline void enter_lazy_tlb(struct mm_struct *mm, |
| struct task_struct *tsk) |
| { |
| } |
| |
| /* |
| * The proto-VSID space has 2^35 - 1 segments available for user mappings. |
| * Each segment contains 2^28 bytes. Each context maps 2^44 bytes, |
| * so we can support 2^19-1 contexts (19 == 35 + 28 - 44). |
| */ |
| #define NO_CONTEXT 0 |
| #define MAX_CONTEXT ((1UL << 19) - 1) |
| |
| extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); |
| extern void destroy_context(struct mm_struct *mm); |
| |
| extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm); |
| extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); |
| |
| /* |
| * switch_mm is the entry point called from the architecture independent |
| * code in kernel/sched.c |
| */ |
| static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
| struct task_struct *tsk) |
| { |
| if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask)) |
| cpu_set(smp_processor_id(), next->cpu_vm_mask); |
| |
| /* No need to flush userspace segments if the mm doesnt change */ |
| if (prev == next) |
| return; |
| |
| #ifdef CONFIG_ALTIVEC |
| if (cpu_has_feature(CPU_FTR_ALTIVEC)) |
| asm volatile ("dssall"); |
| #endif /* CONFIG_ALTIVEC */ |
| |
| if (cpu_has_feature(CPU_FTR_SLB)) |
| switch_slb(tsk, next); |
| else |
| switch_stab(tsk, next); |
| } |
| |
| #define deactivate_mm(tsk,mm) do { } while (0) |
| |
| /* |
| * After we have set current->mm to a new value, this activates |
| * the context for the new mm so we see the new mappings. |
| */ |
| static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| switch_mm(prev, next, current); |
| local_irq_restore(flags); |
| } |
| |
| #endif /* CONFIG_PPC64 */ |
| #endif /* __KERNEL__ */ |
| #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |