ARC: optimize kernel bss clearing in early boot code

	; Clear BSS before updating any globals

	; XXX: use ZOL here

	mov	r5, __bss_start

	mov	r6, __bss_stop

1:

	sub	r6, __bss_stop, r5

	lsr.f	lp_count, r6, 2

	lpnz	1f

	st.ab   0, [r5, 4]

	brlt    r5, r6, 1b

1:

	; Uboot - kernel ABI

	;    r0 = [0] No uboot interaction, [1] cmdline in r2, [2] DTB in r2

	_edata = .;

	BSS_SECTION(0, 0, 0)

	BSS_SECTION(4, 4, 4)

#ifdef CONFIG_ARC_DW2_UNWIND

	. = ALIGN(PAGE_SIZE);