linux/arch/arm/mm/proc-macros.S

/*
 * We need constants.h for:
 *  VMA_VM_MM
 *  VMA_VM_FLAGS
 *  VM_EXEC
 */
#include <asm/asm-offsets.h>
#include <asm/thread_info.h>

/*
 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
 */
	.macro	vma_vm_mm, rd, rn
	ldr	\rd, [\rn, #VMA_VM_MM]
	.endm

/*
 * vma_vm_flags - get vma->vm_flags
 */
	.macro	vma_vm_flags, rd, rn
	ldr	\rd, [\rn, #VMA_VM_FLAGS]
	.endm

	.macro	tsk_mm, rd, rn
	ldr	\rd, [\rn, #TI_TASK]
	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
	.endm

/*
 * act_mm - get current->active_mm
 */
	.macro	act_mm, rd
	bic	\rd, sp, #8128
	bic	\rd, \rd, #63
	ldr	\rd, [\rd, #TI_TASK]
	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
	.endm

/*
 * mmid - get context id from mm pointer (mm->context.id)
 */
	.macro	mmid, rd, rn
	ldr	\rd, [\rn, #MM_CONTEXT_ID]
	.endm

/*
 * mask_asid - mask the ASID from the context ID
 */
	.macro	asid, rd, rn
	and	\rd, \rn, #255
	.endm

	.macro	crval, clear, mmuset, ucset
#ifdef CONFIG_MMU
	.word	\clear
	.word	\mmuset
#else
	.word	\clear
	.word	\ucset
#endif
	.endm

/*
 * cache_line_size - get the cache line size from the CSIDR register
 * (available on ARMv7+). It assumes that the CSSR register was configured
 * to access the L1 data cache CSIDR.
 */
	.macro	dcache_line_size, reg, tmp
	mrc	p15, 1, \tmp, c0, c0, 0		@ read CSIDR
	and	\tmp, \tmp, #7			@ cache line size encoding
	mov	\reg, #16			@ size offset
	mov	\reg, \reg, lsl \tmp		@ actual cache line size
	.endm