FreeBSD/Linux Kernel Cross Reference
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/sched.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(void)
    {
            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;
            schedinit_ap();
    
            /* XXX shouldn't the pcb_sp be checked/forced for alignment here?? */
    
            return (sp);
    }
    
    void
    cpudep_ap_setup(void)
    {
    }

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