arch/xtensa/include/asm/tlbflush.h

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

File Facts

System
Linux kernel
Corpus path
arch/xtensa/include/asm/tlbflush.h
Extension
.h
Size
5622 bytes
Lines
206
Domain
Architecture Layer
Bucket
arch/xtensa
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 _XTENSA_TLBFLUSH_H
#define _XTENSA_TLBFLUSH_H

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

#define DTLB_WAY_PGD	7

#define ITLB_ARF_WAYS	4
#define DTLB_ARF_WAYS	4

#define ITLB_HIT_BIT	3
#define DTLB_HIT_BIT	4

#ifndef __ASSEMBLER__

/* TLB flushing:
 *
 *  - flush_tlb_all() flushes all processes TLB entries
 *  - flush_tlb_mm(mm) flushes the specified mm context TLB entries
 *  - flush_tlb_page(vma, page) flushes a single page
 *  - flush_tlb_range(vma, vmaddr, end) flushes a range of pages
 */

void local_flush_tlb_all(void);
void local_flush_tlb_mm(struct mm_struct *mm);
void local_flush_tlb_page(struct vm_area_struct *vma,
		unsigned long page);
void local_flush_tlb_range(struct vm_area_struct *vma,
		unsigned long start, unsigned long end);
void local_flush_tlb_kernel_range(unsigned long start, unsigned long end);

#ifdef CONFIG_SMP

void flush_tlb_all(void);
void flush_tlb_mm(struct mm_struct *);
void flush_tlb_page(struct vm_area_struct *, unsigned long);
void flush_tlb_range(struct vm_area_struct *, unsigned long,
		unsigned long);
void flush_tlb_kernel_range(unsigned long start, unsigned long end);

#else /* !CONFIG_SMP */

#define flush_tlb_all()			   local_flush_tlb_all()
#define flush_tlb_mm(mm)		   local_flush_tlb_mm(mm)
#define flush_tlb_page(vma, page)	   local_flush_tlb_page(vma, page)
#define flush_tlb_range(vma, vmaddr, end)  local_flush_tlb_range(vma, vmaddr, \
								 end)
#define flush_tlb_kernel_range(start, end) local_flush_tlb_kernel_range(start, \
									end)

#endif /* CONFIG_SMP */

/* TLB operations. */

static inline unsigned long itlb_probe(unsigned long addr)
{
	unsigned long tmp;
	__asm__ __volatile__("pitlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
	return tmp;
}

static inline unsigned long dtlb_probe(unsigned long addr)
{
	unsigned long tmp;
	__asm__ __volatile__("pdtlb  %0, %1\n\t" : "=a" (tmp) : "a" (addr));
	return tmp;
}

static inline void invalidate_itlb_entry (unsigned long probe)
{
	__asm__ __volatile__("iitlb  %0; isync\n\t" : : "a" (probe));
}

static inline void invalidate_dtlb_entry (unsigned long probe)
{
	__asm__ __volatile__("idtlb  %0; dsync\n\t" : : "a" (probe));
}

/* Use the .._no_isync functions with caution.  Generally, these are
 * handy for bulk invalidates followed by a single 'isync'.  The
 * caller must follow up with an 'isync', which can be relatively
 * expensive on some Xtensa implementations.
 */
static inline void invalidate_itlb_entry_no_isync (unsigned entry)
{
	/* Caller must follow up with 'isync'. */
	__asm__ __volatile__ ("iitlb  %0\n" : : "a" (entry) );
}

Annotation

Implementation Notes