/* * linux/include/asm-arm/mmu_context.h * * Copyright (C) 1996 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Changelog: * 27-06-1996 RMK Created */ #ifndef __ASM_ARM_MMU_CONTEXT_H #define __ASM_ARM_MMU_CONTEXT_H #include <asm/bitops.h> #include <asm/pgtable.h> #include <asm/arch/memory.h> #include <asm/proc-fns.h> #define destroy_context(mm) do { } while(0) #define init_new_context(tsk,mm) 0 /* * This is called when "tsk" is about to enter lazy TLB mode. * * mm: describes the currently active mm context * tsk: task which is entering lazy tlb * cpu: cpu number which is entering lazy tlb * * tsk->mm will be NULL */ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu) { } /* * This is the actual mm switch as far as the scheduler * is concerned. No registers are touched. */ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk, unsigned int cpu) { if (prev != next) cpu_switch_mm(next->pgd, tsk); } #define activate_mm(prev, next) \ switch_mm((prev),(next),NULL,smp_processor_id()) /* * Find first bit set in a 168-bit bitmap, where the first * 128 bits are unlikely to be set. */ static inline int sched_find_first_bit(unsigned long *b) { #if MAX_RT_PRIO != 128 || MAX_PRIO != 168 #error update this function #endif if (unlikely(b[0])) return __ffs(b[0]); if (unlikely(b[1])) return __ffs(b[1]) + 32; if (unlikely(b[2])) return __ffs(b[2]) + 64; if (unlikely(b[3])) return __ffs(b[3]) + 96; if (b[4]) return __ffs(b[4]) + MAX_RT_PRIO; return __ffs(b[5]) + 32 + MAX_RT_PRIO; } #endif