cpu_subr64.S

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    1 /*-
    2  * Copyright (c) 2017-2018 QCM Technologies.
    3  * Copyright (c) 2017-2018 Semihalf.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD$
   28  */
   29 
   30 #include "assym.inc"
   31 
   32 #include <machine/asm.h>
   33 
   34         .p2align 3
   35 ENTRY(enter_idle_powerx)
   36         mfsprg0 %r3                     /* Get the pcpu pointer */
   37         ld      %r3,PC_CURTHREAD(%r3)   /* Get current thread */
   38         ld      %r3,TD_PCB(%r3)         /* Get PCB of current thread */
   39         std     %r12,PCB_CONTEXT(%r3)   /* Save the non-volatile GP regs. */
   40         std     %r13,PCB_CONTEXT+1*8(%r3)
   41         std     %r14,PCB_CONTEXT+2*8(%r3)
   42         std     %r15,PCB_CONTEXT+3*8(%r3)
   43         std     %r16,PCB_CONTEXT+4*8(%r3)
   44         std     %r17,PCB_CONTEXT+5*8(%r3)
   45         std     %r18,PCB_CONTEXT+6*8(%r3)
   46         std     %r19,PCB_CONTEXT+7*8(%r3)
   47         std     %r20,PCB_CONTEXT+8*8(%r3)
   48         std     %r21,PCB_CONTEXT+9*8(%r3)
   49         std     %r22,PCB_CONTEXT+10*8(%r3)
   50         std     %r23,PCB_CONTEXT+11*8(%r3)
   51         std     %r24,PCB_CONTEXT+12*8(%r3)
   52         std     %r25,PCB_CONTEXT+13*8(%r3)
   53         std     %r26,PCB_CONTEXT+14*8(%r3)
   54         std     %r27,PCB_CONTEXT+15*8(%r3)
   55         std     %r28,PCB_CONTEXT+16*8(%r3)
   56         std     %r29,PCB_CONTEXT+17*8(%r3)
   57         std     %r30,PCB_CONTEXT+18*8(%r3)
   58         std     %r31,PCB_CONTEXT+19*8(%r3)
   59 
   60         mfcr    %r16                    /* Save the condition register */
   61         std     %r16,PCB_CR(%r3)
   62         mflr    %r16                    /* Save the link register */
   63         std     %r16,PCB_LR(%r3)
   64         std     %r1,PCB_SP(%r3)         /* Save the stack pointer */
   65         std     %r2,PCB_TOC(%r3)        /* Save the TOC pointer */
   66 
   67         bl      1f
   68 1:      mflr    %r3
   69         addi    %r3,%r3,power_save_sequence-1b
   70         mtsrr0  %r3
   71 
   72         /* Set MSR */
   73         li      %r3,0
   74         ori     %r3,%r3,(PSL_ME | PSL_RI)
   75         li      %r8,0x9                 /* PSL_SF and PSL_HV */
   76         insrdi  %r3,%r8,4,0
   77         mtsrr1  %r3
   78 
   79         rfid
   80 
   81         .p2align 2
   82 power_save_sequence:
   83         bl      1f
   84         .llong  0x0                     /* Playground for power-save sequence */
   85 1:      mflr    %r3
   86 
   87         /* Start power-save sequence */
   88         std     %r2,0(%r3)
   89         ptesync
   90         ld      %r2,0(%r3)
   91 2:      cmpd    %r2,%r2
   92         bne     2b
   93         nap
   94         b       .

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FreeBSD/Linux Kernel Cross Reference sys/powerpc/powerpc/cpu_subr64.S

FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/cpu_subr64.S