freebsd-dev/sys/powerpc/booke/mp_cpudep.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2008-2009 Semihalf, Rafal Jaworowski
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/smp.h>

#include <machine/pcb.h>
#include <machine/psl.h>
#include <machine/smp.h>
#include <machine/spr.h>

extern void dcache_enable(void);
extern void dcache_inval(void);
extern void icache_enable(void);
extern void icache_inval(void);

volatile void *ap_pcpu;

uintptr_t
cpudep_ap_bootstrap()
{
	uint32_t msr, csr;
	uintptr_t sp;

	/* Enable L1 caches */
	csr = mfspr(SPR_L1CSR0);
	if ((csr & L1CSR0_DCE) == 0) {
		dcache_inval();
		dcache_enable();
	}

	csr = mfspr(SPR_L1CSR1);
	if ((csr & L1CSR1_ICE) == 0) {
		icache_inval();
		icache_enable();
	}

	/* Set MSR */
#ifdef __powerpc64__
	msr = PSL_CM | PSL_ME;
#else
	msr = PSL_ME;
#endif
	mtmsr(msr);

	/* Assign pcpu fields, return ptr to this AP's idle thread kstack */
	pcpup->pc_curthread = pcpup->pc_idlethread;
#ifdef __powerpc64__
	__asm __volatile("mr 13,%0" :: "r"(pcpup->pc_curthread));
#else
	__asm __volatile("mr 2,%0" :: "r"(pcpup->pc_curthread));
#endif
	pcpup->pc_curpcb = pcpup->pc_curthread->td_pcb;
	sp = pcpup->pc_curpcb->pcb_sp;

	/* XXX shouldn't the pcb_sp be checked/forced for alignment here?? */

	return (sp);
}

void
cpudep_ap_setup()
{
}