arch/alpha/include/asm/tlbflush.h

Source file repositories/reference/linux-study-clean/arch/alpha/include/asm/tlbflush.h

File Facts

System
Linux kernel
Corpus path
arch/alpha/include/asm/tlbflush.h
Extension
.h
Size
2655 bytes
Lines
122
Domain
Architecture Layer
Bucket
arch/alpha
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ALPHA_TLBFLUSH_H
#define _ALPHA_TLBFLUSH_H

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

#ifndef __EXTERN_INLINE
#define __EXTERN_INLINE extern inline
#define __MMU_EXTERN_INLINE
#endif

extern void __load_new_mm_context(struct mm_struct *);


__EXTERN_INLINE void
ev5_flush_tlb_current(struct mm_struct *mm)
{
	__load_new_mm_context(mm);
}

/* Flush just one page in the current TLB set.  We need to be very
   careful about the icache here, there is no way to invalidate a
   specific icache page.  */

__EXTERN_INLINE void
ev5_flush_tlb_current_page(struct mm_struct * mm,
			   struct vm_area_struct *vma,
			   unsigned long addr)
{
	if (vma->vm_flags & VM_EXEC)
		__load_new_mm_context(mm);
	else
		tbi(2, addr);
}


#define flush_tlb_current	ev5_flush_tlb_current
#define flush_tlb_current_page	ev5_flush_tlb_current_page

#ifdef __MMU_EXTERN_INLINE
#undef __EXTERN_INLINE
#undef __MMU_EXTERN_INLINE
#endif

/* Flush current user mapping.  */
static inline void
flush_tlb(void)
{
	flush_tlb_current(current->active_mm);
}

/* Flush someone else's user mapping.  */
static inline void
flush_tlb_other(struct mm_struct *mm)
{
	unsigned long *mmc = &mm->context[smp_processor_id()];
	/* Check it's not zero first to avoid cacheline ping pong
	   when possible.  */

	if (READ_ONCE(*mmc))
		WRITE_ONCE(*mmc, 0);
}

#ifndef CONFIG_SMP
/* Flush everything (kernel mapping may also have changed
   due to vmalloc/vfree).  */
static inline void flush_tlb_all(void)
{
	tbia();
}

/* Flush a specified user mapping.  */
static inline void
flush_tlb_mm(struct mm_struct *mm)
{
	if (mm == current->active_mm)
		flush_tlb_current(mm);
	else
		flush_tlb_other(mm);
}

/* Page-granular tlb flush.  */
static inline void
flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm == current->active_mm)
		flush_tlb_current_page(mm, vma, addr);

Annotation

Implementation Notes