asm_malta.S

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    1 /*-
    2  * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed by SRI International and the
    6  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
    7  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Portions of this software were developed by the University of Cambridge
   10  * Computer Laboratory as part of the CTSRD Project, with support from the
   11  * UK Higher Education Innovation Fund (HEIF).
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $FreeBSD: releng/12.0/sys/mips/malta/asm_malta.S 337769 2018-08-14 16:26:44Z br $
   35  */
   36 
   37 #include <machine/asm.h>
   38 
   39 #define VPECONF0_MVP    (1 << 1)
   40 #define VPECONF0_VPA    (1 << 0)
   41 
   42         .set noreorder
   43 
   44 #ifdef SMP
   45 /*
   46  * This function must be implemented in assembly because it is called early
   47  * in AP boot without a valid stack.
   48  */
   49 LEAF(platform_processor_id)
   50         .set push
   51         .set mips32r2
   52         mfc0    v0, $15, 1
   53         jr      ra
   54         andi    v0, 0x1f
   55         .set pop
   56 END(platform_processor_id)
   57 
   58 LEAF(malta_cpu_configure)
   59         .set push
   60         .set mips32r2
   61         .set noat
   62         li      t2, (VPECONF0_MVP | VPECONF0_VPA)
   63         move    $1, t2
   64         jr      ra
   65         .word   0x41810000 | (1 << 11) | 2      # mttc0 t2, $1, 2
   66         .set pop
   67 END(malta_cpu_configure)
   68 
   69 /*
   70  * Called on APs to wait until they are told to launch.
   71  */
   72 LEAF(malta_ap_wait)
   73         jal     platform_processor_id
   74         nop
   75 
   76         PTR_LA  t1, malta_ap_boot
   77 
   78 1:
   79         ll      t0, 0(t1)
   80         bne     v0, t0, 1b
   81         nop
   82 
   83         move    t0, zero
   84         sc      t0, 0(t1)
   85 
   86         beqz    t0, 1b
   87         nop
   88 
   89         j       mpentry
   90         nop
   91 END(malta_ap_wait)
   92 #endif

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