+++ /dev/null
-/*
- * 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 */
projects / karo-tx-linux.git / blobdiff