The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arch/score/kernel/head.S

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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    1 /*
    2  * arch/score/kernel/head.S
    3  *
    4  * Score Processor version.
    5  *
    6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
    7  *  Chen Liqin <liqin.chen@sunplusct.com>
    8  *  Lennox Wu <lennox.wu@sunplusct.com>
    9  *
   10  * This program is free software; you can redistribute it and/or modify
   11  * it under the terms of the GNU General Public License as published by
   12  * the Free Software Foundation; either version 2 of the License, or
   13  * (at your option) any later version.
   14  *
   15  * This program is distributed in the hope that it will be useful,
   16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18  * GNU General Public License for more details.
   19  *
   20  * You should have received a copy of the GNU General Public License
   21  * along with this program; if not, see the file COPYING, or write
   22  * to the Free Software Foundation, Inc.,
   23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   24  */
   25 #include <linux/init.h>
   26 #include <linux/linkage.h>
   27 
   28 #include <asm/asm-offsets.h>
   29 
   30         .extern start_kernel
   31         .global init_thread_union
   32         .global kernelsp
   33 
   34 __INIT
   35 ENTRY(_stext)
   36         la      r30, __bss_start        /* initialize BSS segment. */
   37         la      r31, _end
   38         xor     r8, r8, r8
   39 
   40 1:      cmp.c   r31, r30
   41         beq     2f
   42 
   43         sw      r8, [r30]               /* clean memory. */
   44         addi    r30, 4
   45         b       1b
   46 
   47 2:      la      r28, init_thread_union  /* set kernel stack. */
   48         mv      r0, r28
   49         addi    r0, KERNEL_STACK_SIZE - 32
   50         la      r30, kernelsp
   51         sw      r0, [r30]
   52         subi    r0, 4*4
   53         xor     r30, r30, r30
   54         ori     r30, 0x02               /* enable MMU. */
   55         mtcr    r30, cr4
   56         nop
   57         nop
   58         nop
   59         nop
   60         nop
   61         nop
   62         nop
   63 
   64         /* there is no parameter */
   65         xor     r4, r4, r4
   66         xor     r5, r5, r5
   67         xor     r6, r6, r6
   68         xor     r7, r7, r7
   69         la      r30, start_kernel       /* jump to init_arch */
   70         br      r30

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