arch/arm/include/asm/tlbflush.h

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

File Facts

System
Linux kernel
Corpus path
arch/arm/include/asm/tlbflush.h
Extension
.h
Size
18082 bytes
Lines
682
Domain
Architecture Layer
Bucket
arch/arm
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

struct cpu_tlb_fns {
	void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *);
	void (*flush_kern_range)(unsigned long, unsigned long);
	unsigned long tlb_flags;
};

/*
 * Select the calling method
 */
#ifdef MULTI_TLB

#define __cpu_flush_user_tlb_range	cpu_tlb.flush_user_range
#define __cpu_flush_kern_tlb_range	cpu_tlb.flush_kern_range

#else

#define __cpu_flush_user_tlb_range	__glue(_TLB,_flush_user_tlb_range)
#define __cpu_flush_kern_tlb_range	__glue(_TLB,_flush_kern_tlb_range)

extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);

#endif

extern struct cpu_tlb_fns cpu_tlb;

#define __cpu_tlb_flags			cpu_tlb.tlb_flags

/*
 *	TLB Management
 *	==============
 *
 *	The arch/arm/mm/tlb-*.S files implement these methods.
 *
 *	The TLB specific code is expected to perform whatever tests it
 *	needs to determine if it should invalidate the TLB for each
 *	call.  Start addresses are inclusive and end addresses are
 *	exclusive; it is safe to round these addresses down.
 *
 *	flush_tlb_all()
 *
 *		Invalidate the entire TLB.
 *
 *	flush_tlb_mm(mm)
 *
 *		Invalidate all TLB entries in a particular address
 *		space.
 *		- mm	- mm_struct describing address space
 *
 *	flush_tlb_range(vma,start,end)
 *
 *		Invalidate a range of TLB entries in the specified
 *		address space.
 *		- mm	- mm_struct describing address space
 *		- start - start address (may not be aligned)
 *		- end	- end address (exclusive, may not be aligned)
 *
 *	flush_tlb_page(vma, uaddr)
 *
 *		Invalidate the specified page in the specified address range.
 *		- vma	- vm_area_struct describing address range
 *		- vaddr - virtual address (may not be aligned)
 */

/*
 * We optimise the code below by:
 *  - building a set of TLB flags that might be set in __cpu_tlb_flags
 *  - building a set of TLB flags that will always be set in __cpu_tlb_flags
 *  - if we're going to need __cpu_tlb_flags, access it once and only once
 *
 * This allows us to build optimal assembly for the single-CPU type case,
 * and as close to optimal given the compiler constrants for multi-CPU
 * case.  We could do better for the multi-CPU case if the compiler
 * implemented the "%?" method, but this has been discontinued due to too
 * many people getting it wrong.
 */
#define possible_tlb_flags	(v4_possible_flags | \
				 v4wbi_possible_flags | \
				 fr_possible_flags | \
				 v4wb_possible_flags | \
				 fa_possible_flags | \
				 v6wbi_possible_flags | \
				 v7wbi_possible_flags)

#define always_tlb_flags	(v4_always_flags & \
				 v4wbi_always_flags & \
				 fr_always_flags & \
				 v4wb_always_flags & \
				 fa_always_flags & \
				 v6wbi_always_flags & \

Annotation

Implementation Notes