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tlbflush.h

#ifndef _ASM_POWERPC_TLBFLUSH_H
#define _ASM_POWERPC_TLBFLUSH_H

/*
 * TLB flushing:
 *
 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
 *  - flush_tlb_page(vma, vmaddr) flushes one page
 *  - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
 *  - flush_tlb_range(vma, start, end) flushes a range of pages
 *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */
#ifdef __KERNEL__

#if defined(CONFIG_4xx) || defined(CONFIG_8xx) || defined(CONFIG_FSL_BOOKE)
/*
 * TLB flushing for software loaded TLB chips
 *
 * TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
 * flush_tlb_kernel_range are best implemented as tlbia vs
 * specific tlbie's
 */

#include <linux/mm.h>

extern void _tlbie(unsigned long address, unsigned int pid);

#if defined(CONFIG_40x) || defined(CONFIG_8xx)
#define _tlbia()  asm volatile ("tlbia; sync" : : : "memory")
#else /* CONFIG_44x || CONFIG_FSL_BOOKE */
extern void _tlbia(void);
#endif

static inline void flush_tlb_mm(struct mm_struct *mm)
{
      _tlbia();
}

static inline void flush_tlb_page(struct vm_area_struct *vma,
                          unsigned long vmaddr)
{
      _tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
}

static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
                               unsigned long vmaddr)
{
      _tlbie(vmaddr, vma ? vma->vm_mm->context.id : 0);
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
                           unsigned long start, unsigned long end)
{
      _tlbia();
}

static inline void flush_tlb_kernel_range(unsigned long start,
                                unsigned long end)
{
      _tlbia();
}

#elif defined(CONFIG_PPC32)
/*
 * TLB flushing for "classic" hash-MMMU 32-bit CPUs, 6xx, 7xx, 7xxx
 */
extern void _tlbie(unsigned long address);
extern void _tlbia(void);

extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr);
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);

#else
/*
 * TLB flushing for 64-bit has-MMU CPUs
 */

#include <linux/percpu.h>
#include <asm/page.h>

#define PPC64_TLB_BATCH_NR 192

struct ppc64_tlb_batch {
      int               active;
      unsigned long           index;
      struct mm_struct  *mm;
      real_pte_t        pte[PPC64_TLB_BATCH_NR];
      unsigned long           vaddr[PPC64_TLB_BATCH_NR];
      unsigned int            psize;
      int               ssize;
};
DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);

extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);

extern void hpte_need_flush(struct mm_struct *mm, unsigned long addr,
                      pte_t *ptep, unsigned long pte, int huge);

#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE

static inline void arch_enter_lazy_mmu_mode(void)
{
      struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);

      batch->active = 1;
}

static inline void arch_leave_lazy_mmu_mode(void)
{
      struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);

      if (batch->index)
            __flush_tlb_pending(batch);
      batch->active = 0;
}

#define arch_flush_lazy_mmu_mode()      do {} while (0)


extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
                      int ssize, int local);
extern void flush_hash_range(unsigned long number, int local);


static inline void flush_tlb_mm(struct mm_struct *mm)
{
}

static inline void flush_tlb_page(struct vm_area_struct *vma,
                          unsigned long vmaddr)
{
}

static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
                               unsigned long vmaddr)
{
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
                           unsigned long start, unsigned long end)
{
}

static inline void flush_tlb_kernel_range(unsigned long start,
                                unsigned long end)
{
}

/* Private function for use by PCI IO mapping code */
extern void __flush_hash_table_range(struct mm_struct *mm, unsigned long start,
                             unsigned long end);


#endif

#endif /*__KERNEL__ */
#endif /* _ASM_POWERPC_TLBFLUSH_H */

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