diff options
Diffstat (limited to 'include/asm-mips/mmu_context.h')
| -rw-r--r-- | include/asm-mips/mmu_context.h | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/include/asm-mips/mmu_context.h b/include/asm-mips/mmu_context.h deleted file mode 100644 index 19cdf7642e6..00000000000 --- a/include/asm-mips/mmu_context.h +++ /dev/null @@ -1,196 +0,0 @@ -/* - * Switch a MMU context. - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 1996, 1997, 1998, 1999 by Ralf Baechle - * Copyright (C) 1999 Silicon Graphics, Inc. - */ -#ifndef _ASM_MMU_CONTEXT_H -#define _ASM_MMU_CONTEXT_H - -#include <linux/config.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <asm/cacheflush.h> -#include <asm/tlbflush.h> - -/* - * For the fast tlb miss handlers, we keep a per cpu array of pointers - * to the current pgd for each processor. Also, the proc. id is stuffed - * into the context register. - */ -extern unsigned long pgd_current[]; - -#define TLBMISS_HANDLER_SETUP_PGD(pgd) \ - pgd_current[smp_processor_id()] = (unsigned long)(pgd) - -#ifdef CONFIG_32BIT -#define TLBMISS_HANDLER_SETUP() \ - write_c0_context((unsigned long) smp_processor_id() << 25); \ - TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) -#endif -#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) -#define TLBMISS_HANDLER_SETUP() \ - write_c0_context((unsigned long) &pgd_current[smp_processor_id()] << 23); \ - TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) -#endif -#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64) -#define TLBMISS_HANDLER_SETUP() \ - write_c0_context((unsigned long) smp_processor_id() << 26); \ - TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir) -#endif - -#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) - -#define ASID_INC 0x40 -#define ASID_MASK 0xfc0 - -#elif defined(CONFIG_CPU_R8000) - -#define ASID_INC 0x10 -#define ASID_MASK 0xff0 - -#elif defined(CONFIG_CPU_RM9000) - -#define ASID_INC 0x1 -#define ASID_MASK 0xfff - -#else /* FIXME: not correct for R6000 */ - -#define ASID_INC 0x1 -#define ASID_MASK 0xff - -#endif - -#define cpu_context(cpu, mm) ((mm)->context[cpu]) -#define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK) -#define asid_cache(cpu) (cpu_data[cpu].asid_cache) - -static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) -{ -} - -/* - * All unused by hardware upper bits will be considered - * as a software asid extension. - */ -#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1))) -#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1) - -static inline void -get_new_mmu_context(struct mm_struct *mm, unsigned long cpu) -{ - unsigned long asid = asid_cache(cpu); - - if (! ((asid += ASID_INC) & ASID_MASK) ) { - if (cpu_has_vtag_icache) - flush_icache_all(); - local_flush_tlb_all(); /* start new asid cycle */ - if (!asid) /* fix version if needed */ - asid = ASID_FIRST_VERSION; - } - cpu_context(cpu, mm) = asid_cache(cpu) = asid; -} - -/* - * Initialize the context related info for a new mm_struct - * instance. - */ -static inline int -init_new_context(struct task_struct *tsk, struct mm_struct *mm) -{ - int i; - - for (i = 0; i < num_online_cpus(); i++) - cpu_context(i, mm) = 0; - - return 0; -} - -static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, - struct task_struct *tsk) -{ - unsigned int cpu = smp_processor_id(); - unsigned long flags; - - local_irq_save(flags); - - /* Check if our ASID is of an older version and thus invalid */ - if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & ASID_VERSION_MASK) - get_new_mmu_context(next, cpu); - - write_c0_entryhi(cpu_context(cpu, next)); - TLBMISS_HANDLER_SETUP_PGD(next->pgd); - - /* - * Mark current->active_mm as not "active" anymore. - * We don't want to mislead possible IPI tlb flush routines. - */ - cpu_clear(cpu, prev->cpu_vm_mask); - cpu_set(cpu, next->cpu_vm_mask); - - local_irq_restore(flags); -} - -/* - * Destroy context related info for an mm_struct that is about - * to be put to rest. - */ -static inline void destroy_context(struct mm_struct *mm) -{ -} - -#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; - unsigned int cpu = smp_processor_id(); - - local_irq_save(flags); - - /* Unconditionally get a new ASID. */ - get_new_mmu_context(next, cpu); - - write_c0_entryhi(cpu_context(cpu, next)); - TLBMISS_HANDLER_SETUP_PGD(next->pgd); - - /* mark mmu ownership change */ - cpu_clear(cpu, prev->cpu_vm_mask); - cpu_set(cpu, next->cpu_vm_mask); - - local_irq_restore(flags); -} - -/* - * If mm is currently active_mm, we can't really drop it. Instead, - * we will get a new one for it. - */ -static inline void -drop_mmu_context(struct mm_struct *mm, unsigned cpu) -{ - unsigned long flags; - - local_irq_save(flags); - - if (cpu_isset(cpu, mm->cpu_vm_mask)) { - get_new_mmu_context(mm, cpu); - write_c0_entryhi(cpu_asid(cpu, mm)); - } else { - /* will get a new context next time */ - cpu_context(cpu, mm) = 0; - } - - local_irq_restore(flags); -} - -#endif /* _ASM_MMU_CONTEXT_H */ |