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#ifndef _I386_TLBFLUSH_H
#define _I386_TLBFLUSH_H
#include <linux/config.h>
#include <linux/mm.h>
#include <asm/processor.h>
#define __flush_tlb() \
do { \
unsigned int tmpreg; \
\
__asm__ __volatile__( \
"movl %%cr3, %0; \n" \
"movl %0, %%cr3; # flush TLB \n" \
: "=r" (tmpreg) \
:: "memory"); \
} while (0)
/*
* Global pages have to be flushed a bit differently. Not a real
* performance problem because this does not happen often.
*/
#define __flush_tlb_global() \
do { \
unsigned int tmpreg, cr4, cr4_orig; \
\
__asm__ __volatile__( \
"movl %%cr4, %2; # turn off PGE \n" \
"movl %2, %1; \n" \
"andl %3, %1; \n" \
"movl %1, %%cr4; \n" \
"movl %%cr3, %0; \n" \
"movl %0, %%cr3; # flush TLB \n" \
"movl %2, %%cr4; # turn PGE back on \n" \
: "=&r" (tmpreg), "=&r" (cr4), "=&r" (cr4_orig) \
: "i" (~X86_CR4_PGE) \
: "memory"); \
} while (0)
extern unsigned long pgkern_mask;
# define __flush_tlb_all() \
do { \
if (cpu_has_pge) \
__flush_tlb_global(); \
else \
__flush_tlb(); \
} while (0)
#define cpu_has_invlpg (boot_cpu_data.x86 > 3)
#define __flush_tlb_single(addr) \
__asm__ __volatile__("invlpg %0": :"m" (*(char *) addr))
#ifdef CONFIG_X86_INVLPG
# define __flush_tlb_one(addr) __flush_tlb_single(addr)
#else
# define __flush_tlb_one(addr) \
do { \
if (cpu_has_invlpg) \
__flush_tlb_single(addr); \
else \
__flush_tlb(); \
} while (0)
#endif
/*
* 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
*
* ..but the i386 has somewhat limited tlb flushing capabilities,
* and page-granular flushes are available only on i486 and up.
*/
#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
struct tlb_state
{
struct mm_struct *active_mm;
int state;
char __cacheline_padding[L1_CACHE_BYTES-8];
};
DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
#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)
{
/* i386 does not keep any page table caches in TLB */
}
#endif /* _I386_TLBFLUSH_H */
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