linux-vybrid_public/arch/arm/mach-prima2/headsmp.S

/*
 * Entry of the second core for CSR Marco dual-core SMP SoCs
 *
 * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
 *
 * Licensed under GPLv2 or later.
 */

#include <linux/linkage.h>
#include <linux/init.h>

	__INIT
/*
 * Cold boot and hardware reset show different behaviour,
 * system will be always panic if we warm-reset the board
 * Here we invalidate L1 of CPU1 to make sure there isn't
 * uninitialized data written into memory later
 */
ENTRY(v7_invalidate_l1)
	mov	r0, #0
	mcr	p15, 0, r0, c7, c5, 0	@ invalidate I cache
	mcr	p15, 2, r0, c0, c0, 0
	mrc	p15, 1, r0, c0, c0, 0

	ldr	r1, =0x7fff
	and	r2, r1, r0, lsr #13

	ldr	r1, =0x3ff

	and	r3, r1, r0, lsr #3	@ NumWays - 1
	add	r2, r2, #1		@ NumSets

	and	r0, r0, #0x7
	add	r0, r0, #4	@ SetShift

	clz	r1, r3		@ WayShift
	add	r4, r3, #1	@ NumWays
1:	sub	r2, r2, #1	@ NumSets--
	mov	r3, r4		@ Temp = NumWays
2:	subs	r3, r3, #1	@ Temp--
	mov	r5, r3, lsl r1
	mov	r6, r2, lsl r0
	orr	r5, r5, r6	@ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
	mcr	p15, 0, r5, c7, c6, 2
	bgt	2b
	cmp	r2, #0
	bgt	1b
	dsb
	isb
	mov	pc, lr
ENDPROC(v7_invalidate_l1)

/*
 * SIRFSOC specific entry point for secondary CPUs.  This provides
 * a "holding pen" into which all secondary cores are held until we're
 * ready for them to initialise.
 */
ENTRY(sirfsoc_secondary_startup)
	bl v7_invalidate_l1
        mrc     p15, 0, r0, c0, c0, 5
        and     r0, r0, #15
        adr     r4, 1f
        ldmia   r4, {r5, r6}
        sub     r4, r4, r5
        add     r6, r6, r4
pen:    ldr     r7, [r6]
        cmp     r7, r0
        bne     pen

        /*
         * we've been released from the holding pen: secondary_stack
         * should now contain the SVC stack for this core
         */
        b       secondary_startup
ENDPROC(sirfsoc_secondary_startup)

        .align
1:      .long   .
        .long   pen_release