freebsd-dev/sys/powerpc/booke/mp_cpudep.c
Nathan Whitehorn bdac436008 Follow up r223485, which made AIM use the ABI thread pointer instead of
PCPU fields for curthread, by doing the same to Book-E. This closes
some potential races switching between CPUs. As a side effect, it turns out
the AIM and Book-E swtch.S implementations were the same to within a few
registers, so move that to powerpc/powerpc.

MFC after: 3 months
2013-11-11 17:37:50 +00:00

91 lines
2.5 KiB
C

/*-
* 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, sp, csr;
/* 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 */
msr = PSL_ME;
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()
{
}