diff options
Diffstat (limited to 'include/asm-sh/mmu_context.h')
| -rw-r--r-- | include/asm-sh/mmu_context.h | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/include/asm-sh/mmu_context.h b/include/asm-sh/mmu_context.h deleted file mode 100644 index 8589a50febd..00000000000 --- a/include/asm-sh/mmu_context.h +++ /dev/null @@ -1,185 +0,0 @@ -/* - * Copyright (C) 1999 Niibe Yutaka - * Copyright (C) 2003 - 2007 Paul Mundt - * - * ASID handling idea taken from MIPS implementation. - */ -#ifndef __ASM_SH_MMU_CONTEXT_H -#define __ASM_SH_MMU_CONTEXT_H - -#ifdef __KERNEL__ -#include <asm/cpu/mmu_context.h> -#include <asm/tlbflush.h> -#include <asm/uaccess.h> -#include <asm/io.h> -#include <asm-generic/mm_hooks.h> - -/* - * The MMU "context" consists of two things: - * (a) TLB cache version (or round, cycle whatever expression you like) - * (b) ASID (Address Space IDentifier) - */ -#define MMU_CONTEXT_ASID_MASK 0x000000ff -#define MMU_CONTEXT_VERSION_MASK 0xffffff00 -#define MMU_CONTEXT_FIRST_VERSION 0x00000100 -#define NO_CONTEXT 0 - -/* ASID is 8-bit value, so it can't be 0x100 */ -#define MMU_NO_ASID 0x100 - -#define asid_cache(cpu) (cpu_data[cpu].asid_cache) - -#ifdef CONFIG_MMU -#define cpu_context(cpu, mm) ((mm)->context.id[cpu]) - -#define cpu_asid(cpu, mm) \ - (cpu_context((cpu), (mm)) & MMU_CONTEXT_ASID_MASK) - -/* - * Virtual Page Number mask - */ -#define MMU_VPN_MASK 0xfffff000 - -#if defined(CONFIG_SUPERH32) -#include "mmu_context_32.h" -#else -#include "mmu_context_64.h" -#endif - -/* - * Get MMU context if needed. - */ -static inline void get_mmu_context(struct mm_struct *mm, unsigned int cpu) -{ - unsigned long asid = asid_cache(cpu); - - /* Check if we have old version of context. */ - if (((cpu_context(cpu, mm) ^ asid) & MMU_CONTEXT_VERSION_MASK) == 0) - /* It's up to date, do nothing */ - return; - - /* It's old, we need to get new context with new version. */ - if (!(++asid & MMU_CONTEXT_ASID_MASK)) { - /* - * We exhaust ASID of this version. - * Flush all TLB and start new cycle. - */ - flush_tlb_all(); - -#ifdef CONFIG_SUPERH64 - /* - * The SH-5 cache uses the ASIDs, requiring both the I and D - * cache to be flushed when the ASID is exhausted. Weak. - */ - flush_cache_all(); -#endif - - /* - * Fix version; Note that we avoid version #0 - * to distingush NO_CONTEXT. - */ - if (!asid) - asid = MMU_CONTEXT_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) = NO_CONTEXT; - - return 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_context(struct mm_struct *mm, unsigned int cpu) -{ - get_mmu_context(mm, cpu); - set_asid(cpu_asid(cpu, mm)); -} - -static inline void switch_mm(struct mm_struct *prev, - struct mm_struct *next, - struct task_struct *tsk) -{ - unsigned int cpu = smp_processor_id(); - - if (likely(prev != next)) { - cpu_set(cpu, next->cpu_vm_mask); - set_TTB(next->pgd); - activate_context(next, cpu); - } else - if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) - activate_context(next, cpu); -} -#else -#define get_mmu_context(mm) do { } while (0) -#define init_new_context(tsk,mm) (0) -#define destroy_context(mm) do { } while (0) -#define set_asid(asid) do { } while (0) -#define get_asid() (0) -#define cpu_asid(cpu, mm) ({ (void)cpu; 0; }) -#define switch_and_save_asid(asid) (0) -#define set_TTB(pgd) do { } while (0) -#define get_TTB() (0) -#define activate_context(mm,cpu) do { } while (0) -#define switch_mm(prev,next,tsk) do { } while (0) -#endif /* CONFIG_MMU */ - -#define activate_mm(prev, next) switch_mm((prev),(next),NULL) -#define deactivate_mm(tsk,mm) do { } while (0) -#define enter_lazy_tlb(mm,tsk) do { } while (0) - -#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) -/* - * If this processor has an MMU, we need methods to turn it off/on .. - * paging_init() will also have to be updated for the processor in - * question. - */ -static inline void enable_mmu(void) -{ - unsigned int cpu = smp_processor_id(); - - /* Enable MMU */ - ctrl_outl(MMU_CONTROL_INIT, MMUCR); - ctrl_barrier(); - - if (asid_cache(cpu) == NO_CONTEXT) - asid_cache(cpu) = MMU_CONTEXT_FIRST_VERSION; - - set_asid(asid_cache(cpu) & MMU_CONTEXT_ASID_MASK); -} - -static inline void disable_mmu(void) -{ - unsigned long cr; - - cr = ctrl_inl(MMUCR); - cr &= ~MMU_CONTROL_INIT; - ctrl_outl(cr, MMUCR); - - ctrl_barrier(); -} -#else -/* - * MMU control handlers for processors lacking memory - * management hardware. - */ -#define enable_mmu() do { } while (0) -#define disable_mmu() do { } while (0) -#endif - -#endif /* __KERNEL__ */ -#endif /* __ASM_SH_MMU_CONTEXT_H */ |