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tlbflush.h

/*
 *  arch/arm/include/asm/tlbflush.h
 *
 *  Copyright (C) 1999-2003 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.
 */
#ifndef _ASMARM_TLBFLUSH_H
#define _ASMARM_TLBFLUSH_H


#ifndef CONFIG_MMU

#define tlb_flush(tlb)  ((void) tlb)

#else /* CONFIG_MMU */

#include <asm/glue.h>

#define TLB_V3_PAGE     (1 << 0)
#define TLB_V4_U_PAGE   (1 << 1)
#define TLB_V4_D_PAGE   (1 << 2)
#define TLB_V4_I_PAGE   (1 << 3)
#define TLB_V6_U_PAGE   (1 << 4)
#define TLB_V6_D_PAGE   (1 << 5)
#define TLB_V6_I_PAGE   (1 << 6)

#define TLB_V3_FULL     (1 << 8)
#define TLB_V4_U_FULL   (1 << 9)
#define TLB_V4_D_FULL   (1 << 10)
#define TLB_V4_I_FULL   (1 << 11)
#define TLB_V6_U_FULL   (1 << 12)
#define TLB_V6_D_FULL   (1 << 13)
#define TLB_V6_I_FULL   (1 << 14)

#define TLB_V6_U_ASID   (1 << 16)
#define TLB_V6_D_ASID   (1 << 17)
#define TLB_V6_I_ASID   (1 << 18)

#define TLB_BTB         (1 << 28)

/* Unified Inner Shareable TLB operations (ARMv7 MP extensions) */
#define TLB_V7_UIS_PAGE (1 << 19)
#define TLB_V7_UIS_FULL (1 << 20)
#define TLB_V7_UIS_ASID (1 << 21)

/* Inner Shareable BTB operation (ARMv7 MP extensions) */
#define TLB_V7_IS_BTB   (1 << 22)

#define TLB_L2CLEAN_FR  (1 << 29)         /* Feroceon */
#define TLB_DCLEAN      (1 << 30)
#define TLB_WB          (1 << 31)

/*
 *    MMU TLB Model
 *    =============
 *
 *    We have the following to choose from:
 *      v3    - ARMv3
 *      v4    - ARMv4 without write buffer
 *      v4wb  - ARMv4 with write buffer without I TLB flush entry instruction
 *      v4wbi - ARMv4 with write buffer with I TLB flush entry instruction
 *      fr    - Feroceon (v4wbi with non-outer-cacheable page table walks)
 *      fa    - Faraday (v4 with write buffer with UTLB and branch target buffer (BTB))
 *      v6wbi - ARMv6 with write buffer with I TLB flush entry instruction
 *      v7wbi - identical to v6wbi
 */
#undef _TLB
#undef MULTI_TLB

#ifdef CONFIG_SMP_ON_UP
#define MULTI_TLB 1
#endif

#define v3_tlb_flags    (TLB_V3_FULL | TLB_V3_PAGE)

#ifdef CONFIG_CPU_TLB_V3
# define v3_possible_flags    v3_tlb_flags
# define v3_always_flags      v3_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v3
# endif
#else
# define v3_possible_flags    0
# define v3_always_flags      (-1UL)
#endif

#define v4_tlb_flags    (TLB_V4_U_FULL | TLB_V4_U_PAGE)

#ifdef CONFIG_CPU_TLB_V4WT
# define v4_possible_flags    v4_tlb_flags
# define v4_always_flags      v4_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4
# endif
#else
# define v4_possible_flags    0
# define v4_always_flags      (-1UL)
#endif

#define fa_tlb_flags    (TLB_WB | TLB_BTB | TLB_DCLEAN | \
                   TLB_V4_U_FULL | TLB_V4_U_PAGE)

#ifdef CONFIG_CPU_TLB_FA
# define fa_possible_flags    fa_tlb_flags
# define fa_always_flags      fa_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB fa
# endif
#else
# define fa_possible_flags    0
# define fa_always_flags      (-1UL)
#endif

#define v4wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \
                   TLB_V4_I_FULL | TLB_V4_D_FULL | \
                   TLB_V4_I_PAGE | TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_V4WBI
# define v4wbi_possible_flags v4wbi_tlb_flags
# define v4wbi_always_flags   v4wbi_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wbi
# endif
#else
# define v4wbi_possible_flags 0
# define v4wbi_always_flags   (-1UL)
#endif

#define fr_tlb_flags    (TLB_WB | TLB_DCLEAN | TLB_L2CLEAN_FR | \
                   TLB_V4_I_FULL | TLB_V4_D_FULL | \
                   TLB_V4_I_PAGE | TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_FEROCEON
# define fr_possible_flags    fr_tlb_flags
# define fr_always_flags      fr_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wbi
# endif
#else
# define fr_possible_flags    0
# define fr_always_flags      (-1UL)
#endif

#define v4wb_tlb_flags  (TLB_WB | TLB_DCLEAN | \
                   TLB_V4_I_FULL | TLB_V4_D_FULL | \
                   TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_V4WB
# define v4wb_possible_flags  v4wb_tlb_flags
# define v4wb_always_flags    v4wb_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wb
# endif
#else
# define v4wb_possible_flags  0
# define v4wb_always_flags    (-1UL)
#endif

#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BTB | \
                   TLB_V6_I_FULL | TLB_V6_D_FULL | \
                   TLB_V6_I_PAGE | TLB_V6_D_PAGE | \
                   TLB_V6_I_ASID | TLB_V6_D_ASID)

#ifdef CONFIG_CPU_TLB_V6
# define v6wbi_possible_flags v6wbi_tlb_flags
# define v6wbi_always_flags   v6wbi_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v6wbi
# endif
#else
# define v6wbi_possible_flags 0
# define v6wbi_always_flags   (-1UL)
#endif

#define v7wbi_tlb_flags_smp   (TLB_WB | TLB_DCLEAN | TLB_V7_IS_BTB | \
                   TLB_V7_UIS_FULL | TLB_V7_UIS_PAGE | TLB_V7_UIS_ASID)
#define v7wbi_tlb_flags_up    (TLB_WB | TLB_DCLEAN | TLB_BTB | \
                   TLB_V6_U_FULL | TLB_V6_U_PAGE | TLB_V6_U_ASID)

#ifdef CONFIG_CPU_TLB_V7

# ifdef CONFIG_SMP_ON_UP
#  define v7wbi_possible_flags      (v7wbi_tlb_flags_smp | v7wbi_tlb_flags_up)
#  define v7wbi_always_flags  (v7wbi_tlb_flags_smp & v7wbi_tlb_flags_up)
# elif defined(CONFIG_SMP)
#  define v7wbi_possible_flags      v7wbi_tlb_flags_smp
#  define v7wbi_always_flags  v7wbi_tlb_flags_smp
# else
#  define v7wbi_possible_flags      v7wbi_tlb_flags_up
#  define v7wbi_always_flags  v7wbi_tlb_flags_up
# endif
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v7wbi
# endif
#else
# define v7wbi_possible_flags 0
# define v7wbi_always_flags   (-1UL)
#endif

#ifndef _TLB
#error Unknown TLB model
#endif

#ifndef __ASSEMBLY__

#include <linux/sched.h>

struct cpu_tlb_fns {
      void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *);
      void (*flush_kern_range)(unsigned long, unsigned long);
      unsigned long tlb_flags;
};

/*
 * Select the calling method
 */
#ifdef MULTI_TLB

#define __cpu_flush_user_tlb_range  cpu_tlb.flush_user_range
#define __cpu_flush_kern_tlb_range  cpu_tlb.flush_kern_range

#else

#define __cpu_flush_user_tlb_range  __glue(_TLB,_flush_user_tlb_range)
#define __cpu_flush_kern_tlb_range  __glue(_TLB,_flush_kern_tlb_range)

extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);

#endif

extern struct cpu_tlb_fns cpu_tlb;

#define __cpu_tlb_flags             cpu_tlb.tlb_flags

/*
 *    TLB Management
 *    ==============
 *
 *    The arch/arm/mm/tlb-*.S files implement these methods.
 *
 *    The TLB specific code is expected to perform whatever tests it
 *    needs to determine if it should invalidate the TLB for each
 *    call.  Start addresses are inclusive and end addresses are
 *    exclusive; it is safe to round these addresses down.
 *
 *    flush_tlb_all()
 *
 *          Invalidate the entire TLB.
 *
 *    flush_tlb_mm(mm)
 *
 *          Invalidate all TLB entries in a particular address
 *          space.
 *          - mm  - mm_struct describing address space
 *
 *    flush_tlb_range(mm,start,end)
 *
 *          Invalidate a range of TLB entries in the specified
 *          address space.
 *          - mm  - mm_struct describing address space
 *          - start - start address (may not be aligned)
 *          - end - end address (exclusive, may not be aligned)
 *
 *    flush_tlb_page(vaddr,vma)
 *
 *          Invalidate the specified page in the specified address range.
 *          - vaddr - virtual address (may not be aligned)
 *          - vma - vma_struct describing address range
 *
 *    flush_kern_tlb_page(kaddr)
 *
 *          Invalidate the TLB entry for the specified page.  The address
 *          will be in the kernels virtual memory space.  Current uses
 *          only require the D-TLB to be invalidated.
 *          - kaddr - Kernel virtual memory address
 */

/*
 * We optimise the code below by:
 *  - building a set of TLB flags that might be set in __cpu_tlb_flags
 *  - building a set of TLB flags that will always be set in __cpu_tlb_flags
 *  - if we're going to need __cpu_tlb_flags, access it once and only once
 *
 * This allows us to build optimal assembly for the single-CPU type case,
 * and as close to optimal given the compiler constrants for multi-CPU
 * case.  We could do better for the multi-CPU case if the compiler
 * implemented the "%?" method, but this has been discontinued due to too
 * many people getting it wrong.
 */
#define possible_tlb_flags    (v3_possible_flags | \
                         v4_possible_flags | \
                         v4wbi_possible_flags | \
                         fr_possible_flags | \
                         v4wb_possible_flags | \
                         fa_possible_flags | \
                         v6wbi_possible_flags | \
                         v7wbi_possible_flags)

#define always_tlb_flags      (v3_always_flags & \
                         v4_always_flags & \
                         v4wbi_always_flags & \
                         fr_always_flags & \
                         v4wb_always_flags & \
                         fa_always_flags & \
                         v6wbi_always_flags & \
                         v7wbi_always_flags)

#define tlb_flag(f)     ((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f)))

static inline void local_flush_tlb_all(void)
{
      const int zero = 0;
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      if (tlb_flag(TLB_WB))
            dsb();

      if (tlb_flag(TLB_V3_FULL))
            asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc");
      if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL))
            asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc");
      if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL))
            asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc");
      if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL))
            asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");
      if (tlb_flag(TLB_V7_UIS_FULL))
            asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc");

      if (tlb_flag(TLB_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
      if (tlb_flag(TLB_V7_IS_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
}

static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
      const int zero = 0;
      const int asid = ASID(mm);
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      if (tlb_flag(TLB_WB))
            dsb();

      if (cpumask_test_cpu(get_cpu(), mm_cpumask(mm))) {
            if (tlb_flag(TLB_V3_FULL))
                  asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc");
            if (tlb_flag(TLB_V4_U_FULL))
                  asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc");
            if (tlb_flag(TLB_V4_D_FULL))
                  asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc");
            if (tlb_flag(TLB_V4_I_FULL))
                  asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");
      }
      put_cpu();

      if (tlb_flag(TLB_V6_U_ASID))
            asm("mcr p15, 0, %0, c8, c7, 2" : : "r" (asid) : "cc");
      if (tlb_flag(TLB_V6_D_ASID))
            asm("mcr p15, 0, %0, c8, c6, 2" : : "r" (asid) : "cc");
      if (tlb_flag(TLB_V6_I_ASID))
            asm("mcr p15, 0, %0, c8, c5, 2" : : "r" (asid) : "cc");
      if (tlb_flag(TLB_V7_UIS_ASID))
#ifdef CONFIG_ARM_ERRATA_720789
            asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc");
#else
            asm("mcr p15, 0, %0, c8, c3, 2" : : "r" (asid) : "cc");
#endif

      if (tlb_flag(TLB_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
            dsb();
      }
      if (tlb_flag(TLB_V7_IS_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
}

static inline void
local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
      const int zero = 0;
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm);

      if (tlb_flag(TLB_WB))
            dsb();

      if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
            if (tlb_flag(TLB_V3_PAGE))
                  asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (uaddr) : "cc");
            if (tlb_flag(TLB_V4_U_PAGE))
                  asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc");
            if (tlb_flag(TLB_V4_D_PAGE))
                  asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc");
            if (tlb_flag(TLB_V4_I_PAGE))
                  asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc");
            if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
                  asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");
      }

      if (tlb_flag(TLB_V6_U_PAGE))
            asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc");
      if (tlb_flag(TLB_V6_D_PAGE))
            asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc");
      if (tlb_flag(TLB_V6_I_PAGE))
            asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc");
      if (tlb_flag(TLB_V7_UIS_PAGE))
#ifdef CONFIG_ARM_ERRATA_720789
            asm("mcr p15, 0, %0, c8, c3, 3" : : "r" (uaddr & PAGE_MASK) : "cc");
#else
            asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (uaddr) : "cc");
#endif

      if (tlb_flag(TLB_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
            dsb();
      }
      if (tlb_flag(TLB_V7_IS_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
}

static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
{
      const int zero = 0;
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      kaddr &= PAGE_MASK;

      if (tlb_flag(TLB_WB))
            dsb();

      if (tlb_flag(TLB_V3_PAGE))
            asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V4_U_PAGE))
            asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V4_D_PAGE))
            asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V4_I_PAGE))
            asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc");
      if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
            asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");

      if (tlb_flag(TLB_V6_U_PAGE))
            asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V6_D_PAGE))
            asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V6_I_PAGE))
            asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc");
      if (tlb_flag(TLB_V7_UIS_PAGE))
            asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (kaddr) : "cc");

      if (tlb_flag(TLB_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
      if (tlb_flag(TLB_V7_IS_BTB)) {
            /* flush the branch target cache */
            asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
            dsb();
            isb();
      }
}

/*
 *    flush_pmd_entry
 *
 *    Flush a PMD entry (word aligned, or double-word aligned) to
 *    RAM if the TLB for the CPU we are running on requires this.
 *    This is typically used when we are creating PMD entries.
 *
 *    clean_pmd_entry
 *
 *    Clean (but don't drain the write buffer) if the CPU requires
 *    these operations.  This is typically used when we are removing
 *    PMD entries.
 */
static inline void flush_pmd_entry(pmd_t *pmd)
{
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      if (tlb_flag(TLB_DCLEAN))
            asm("mcr    p15, 0, %0, c7, c10, 1  @ flush_pmd"
                  : : "r" (pmd) : "cc");

      if (tlb_flag(TLB_L2CLEAN_FR))
            asm("mcr    p15, 1, %0, c15, c9, 1  @ L2 flush_pmd"
                  : : "r" (pmd) : "cc");

      if (tlb_flag(TLB_WB))
            dsb();
}

static inline void clean_pmd_entry(pmd_t *pmd)
{
      const unsigned int __tlb_flag = __cpu_tlb_flags;

      if (tlb_flag(TLB_DCLEAN))
            asm("mcr    p15, 0, %0, c7, c10, 1  @ flush_pmd"
                  : : "r" (pmd) : "cc");

      if (tlb_flag(TLB_L2CLEAN_FR))
            asm("mcr    p15, 1, %0, c15, c9, 1  @ L2 flush_pmd"
                  : : "r" (pmd) : "cc");
}

#undef tlb_flag
#undef always_tlb_flags
#undef possible_tlb_flags

/*
 * Convert calls to our calling convention.
 */
#define local_flush_tlb_range(vma,start,end)    __cpu_flush_user_tlb_range(start,end,vma)
#define local_flush_tlb_kernel_range(s,e) __cpu_flush_kern_tlb_range(s,e)

#ifndef CONFIG_SMP
#define flush_tlb_all         local_flush_tlb_all
#define flush_tlb_mm          local_flush_tlb_mm
#define flush_tlb_page        local_flush_tlb_page
#define flush_tlb_kernel_page local_flush_tlb_kernel_page
#define flush_tlb_range       local_flush_tlb_range
#define flush_tlb_kernel_range      local_flush_tlb_kernel_range
#else
extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
extern void flush_tlb_kernel_page(unsigned long kaddr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
#endif

/*
 * If PG_dcache_clean is not set for the page, we need to ensure that any
 * cache entries for the kernels virtual memory range are written
 * back to the page. On ARMv6 and later, the cache coherency is handled via
 * the set_pte_at() function.
 */
#if __LINUX_ARM_ARCH__ < 6
extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
      pte_t *ptep);
#else
static inline void update_mmu_cache(struct vm_area_struct *vma,
                            unsigned long addr, pte_t *ptep)
{
}
#endif

#endif

#endif /* CONFIG_MMU */

#endif

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