/* MN10300 TLB flushing functions
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_TLBFLUSH_H
#define _ASM_TLBFLUSH_H

#include <linux/mm.h>
#include <asm/processor.h>

struct tlb_state {
struct mm_struct *active_mm;
int state;
};
DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);

/**
* local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
*/
static inline void local_flush_tlb(void)
{
int w;
asm volatile(
" mov %1,%0 \n"
" or %2,%0 \n"
" mov %0,%1 \n"
: "=d"(w)
: "m"(MMUCTR), "i"(MMUCTR_IIV|MMUCTR_DIV)
: "cc", "memory");
}

/**
* local_flush_tlb_all - Flush all entries from the local CPU's TLBs
*/
static inline void local_flush_tlb_all(void)
{
local_flush_tlb();
}

/**
* local_flush_tlb_one - Flush one entry from the local CPU's TLBs
*/
static inline void local_flush_tlb_one(unsigned long addr)
{
local_flush_tlb();
}

/**
* local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
* @mm: The MM to flush for
* @addr: The address of the target page in RAM (not its page struct)
*/
static inline
void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
{
unsigned long pteu, flags, cnx;

addr &= PAGE_MASK;

local_irq_save(flags);

cnx = 1;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
cnx = mm->context.tlbpid[smp_processor_id()];
#endif
if (cnx) {
pteu = addr;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
pteu |= cnx & xPTEU_PID;
#endif
IPTEU = pteu;
DPTEU = pteu;
if (IPTEL & xPTEL_V)
IPTEL = 0;
if (DPTEL & xPTEL_V)
DPTEL = 0;
}
local_irq_restore(flags);
}

/*
* TLB flushing:
*
* - flush_tlb() flushes the current mm struct TLBs
* - flush_tlb_all() flushes all processes TLBs
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(mm, start, end) flushes a range of pages
* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
*/
#ifdef CONFIG_SMP

#include <asm/smp.h>

extern void flush_tlb_all(void);
extern void flush_tlb_current_task(void);
extern void flush_tlb_mm(struct mm_struct *);
extern void flush_tlb_page(struct vm_area_struct *, unsigned long);

#define flush_tlb() flush_tlb_current_task()

static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
flush_tlb_mm(vma->vm_mm);
}

#else /* CONFIG_SMP */

static inline void flush_tlb_all(void)
{
preempt_disable();
local_flush_tlb_all();
preempt_enable();
}

static inline void flush_tlb_mm(struct mm_struct *mm)
{
preempt_disable();
local_flush_tlb_all();
preempt_enable();
}

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

#define flush_tlb_page(vma, addr) local_flush_tlb_page((vma)->vm_mm, addr)
#define flush_tlb() flush_tlb_all()

#endif /* CONFIG_SMP */

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

static inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}

#endif /* _ASM_TLBFLUSH_H */