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Annotation of sys/arch/sgi/sgi/locore.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: locore.S,v 1.6 2004/12/24 22:50:31 miod Exp $ */
                      2:
                      3: /*
                      4:  * Copyright (c) 2001-2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
                      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 ``AS IS'' AND ANY EXPRESS
                     16:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     18:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
                     19:  * 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:  */
                     28: #include <sys/errno.h>
                     29: #include <sys/syscall.h>
                     30:
                     31: #include <machine/param.h>
                     32: #include <machine/psl.h>
                     33: #include <machine/asm.h>
                     34: #include <machine/cpu.h>
                     35: #include <machine/regnum.h>
                     36: #include <machine/cpustate.h>
                     37: #include <machine/pte.h>
                     38:
                     39: #include "assym.h"
                     40:
                     41:        .set    noreorder               # Noreorder is default style!
                     42:
                     43:        .globl  idle_stack      # idle stack just below kernel.
                     44: idle_stack:
                     45:
                     46:        .globl  start
                     47:        .globl  kernel_text
                     48: kernel_text = start
                     49: start:
                     50:        mfc0    v0, COP_0_STATUS_REG
                     51:        li      v1, ~SR_INT_ENAB
                     52:        and     v0, v1
                     53:        mtc0    v0, COP_0_STATUS_REG    # disable all interrupts
                     54:
                     55:        mtc0    zero, COP_0_CAUSE_REG   # Clear soft interrupts
                     56:
                     57: /*
                     58:  * Initialize stack and call machine startup.
                     59:  */
                     60:        LA      sp, start - FRAMESZ(CF_SZ)
                     61:        LA      gp, _gp
                     62:        jal     mips_init                       # mips_init(argc, argv, envp)
                     63:        sw      zero, CF_RA_OFFS(sp)            # Zero out old ra for debugger
                     64:
                     65:        move    sp, v0                          # switch to new stack
                     66:        jal     main                            # main(regs)
                     67:        move    a0, zero
                     68:        PANIC("Startup failed!")