#ifndef _ASM_X86_TLBFLUSH_H
#define _ASM_X86_TLBFLUSH_H

#include <linux/mm.h>
#include <linux/sched.h>

#include <asm/processor.h>
#include <asm/special_insns.h>

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#define __flush_tlb() __native_flush_tlb()
#define __flush_tlb_global() __native_flush_tlb_global()
#define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
#endif

static inline void __native_flush_tlb(void)
{
native_write_cr3(native_read_cr3());
}

static inline void __native_flush_tlb_global_irq_disabled(void)
{
unsigned long cr4;

cr4 = native_read_cr4();
/* clear PGE */
native_write_cr4(cr4 & ~X86_CR4_PGE);
/* write old PGE again and flush TLBs */
native_write_cr4(cr4);
}

static inline void __native_flush_tlb_global(void)
{
unsigned long flags;

/*
* Read-modify-write to CR4 - protect it from preemption and
* from interrupts. (Use the raw variant because this code can
* be called from deep inside debugging code.)
*/
raw_local_irq_save(flags);

__native_flush_tlb_global_irq_disabled();

raw_local_irq_restore(flags);
}

static inline void __native_flush_tlb_single(unsigned long addr)
{
asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
}

static inline void __flush_tlb_all(void)
{
if (cpu_has_pge)
__flush_tlb_global();
else
__flush_tlb();
}

static inline void __flush_tlb_one(unsigned long addr)
{
count_vm_event(NR_TLB_LOCAL_FLUSH_ONE);
__flush_tlb_single(addr);
}

#define TLB_FLUSH_ALL -1UL

/*
* 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(vma, start, end) flushes a range of pages
* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
* - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
*
* ..but the i386 has somewhat limited tlb flushing capabilities,
* and page-granular flushes are available only on i486 and up.
*/

#ifndef CONFIG_SMP

/* "_up" is for UniProcessor.
*
* This is a helper for other header functions. *Not* intended to be called
* directly. All global TLB flushes need to either call this, or to bump the
* vm statistics themselves.
*/
static inline void __flush_tlb_up(void)
{
count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
__flush_tlb();
}

static inline void flush_tlb_all(void)
{
count_vm_event(NR_TLB_LOCAL_FLUSH_ALL);
__flush_tlb_all();
}

static inline void flush_tlb(void)
{
__flush_tlb_up();
}

static inline void local_flush_tlb(void)
{
__flush_tlb_up();
}

static inline void flush_tlb_mm(struct mm_struct *mm)
{
if (mm == current->active_mm)
__flush_tlb_up();
}

static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
{
if (vma->vm_mm == current->active_mm)
__flush_tlb_one(addr);
}

static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
if (vma->vm_mm == current->active_mm)
__flush_tlb_up();
}

static inline void flush_tlb_mm_range(struct mm_struct *mm,
unsigned long start, unsigned long end, unsigned long vmflag)
{
if (mm == current->active_mm)
__flush_tlb_up();
}

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

static inline void reset_lazy_tlbstate(void)
{
}

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

#else /* SMP */

#include <asm/smp.h>

#define local_flush_tlb() __flush_tlb()

#define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)

#define flush_tlb_range(vma, start, end) \
flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)

extern void flush_tlb_all(void);
extern void flush_tlb_current_task(void);
extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long end, unsigned long vmflag);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);

#define flush_tlb() flush_tlb_current_task()

void native_flush_tlb_others(const struct cpumask *cpumask,
struct mm_struct *mm,
unsigned long start, unsigned long end);

#define TLBSTATE_OK 1
#define TLBSTATE_LAZY 2

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

static inline void reset_lazy_tlbstate(void)
{
this_cpu_write(cpu_tlbstate.state, 0);
this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
}

#endif /* SMP */

#ifndef CONFIG_PARAVIRT
#define flush_tlb_others(mask, mm, start, end) \
native_flush_tlb_others(mask, mm, start, end)
#endif

#endif /* _ASM_X86_TLBFLUSH_H */