path: root/include/asm-powerpc/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

/*
 * This gets called at the end of handling a page fault, when
 * the kernel has put a new PTE into the page table for the process.
 * We use it to ensure coherency between the i-cache and d-cache
 * for the page which has just been mapped in.
 * On machines which use an MMU hash table, we use this to put a
 * corresponding HPTE into the hash table ahead of time, instead of
 * waiting for the inevitable extra hash-table miss exception.
 */
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);

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