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#ifndef _X8664_TLBFLUSH_H
#define _X8664_TLBFLUSH_H
#include <linux/mm.h>
#include <asm/processor.h>
static inline unsigned long get_cr3(void)
{
unsigned long cr3;
asm volatile("mov %%cr3,%0" : "=r" (cr3));
return cr3;
}
static inline void set_cr3(unsigned long cr3)
{
asm volatile("mov %0,%%cr3" :: "r" (cr3) : "memory");
}
static inline void __flush_tlb(void)
{
set_cr3(get_cr3());
}
static inline unsigned long get_cr4(void)
{
unsigned long cr4;
asm volatile("mov %%cr4,%0" : "=r" (cr4));
return cr4;
}
static inline void set_cr4(unsigned long cr4)
{
asm volatile("mov %0,%%cr4" :: "r" (cr4) : "memory");
}
static inline void __flush_tlb_all(void)
{
unsigned long cr4 = get_cr4();
set_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
set_cr4(cr4); /* write old PGE again and flush TLBs */
}
#define __flush_tlb_one(addr) \
__asm__ __volatile__("invlpg (%0)" :: "r" (addr) : "memory")
/*
* 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_pgtables(mm, start, end) flushes a range of page tables
*
* x86-64 can only flush individual pages or full VMs. For a range flush
* we always do the full VM. Might be worth trying if for a small
* range a few INVLPGs in a row are a win.
*/
#ifndef CONFIG_SMP
#define flush_tlb() __flush_tlb()
#define flush_tlb_all() __flush_tlb_all()
#define local_flush_tlb() __flush_tlb()
static inline void flush_tlb_mm(struct mm_struct *mm)
{
if (mm == current->active_mm)
__flush_tlb();
}
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();
}
#else
#include <asm/smp.h>
#define local_flush_tlb() \
__flush_tlb()
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);
}
#define TLBSTATE_OK 1
#define TLBSTATE_LAZY 2
/* Roughly an IPI every 20MB with 4k pages for freeing page table
ranges. Cost is about 42k of memory for each CPU. */
#define ARCH_FREE_PTE_NR 5350
#endif
#define flush_tlb_kernel_range(start, end) flush_tlb_all()
static inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
/* x86_64 does not keep any page table caches in a software TLB.
The CPUs do in their hardware TLBs, but they are handled
by the normal TLB flushing algorithms. */
}
#endif /* _X8664_TLBFLUSH_H */
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