/*      $OpenBSD: locore.S,v 1.10 2026/04/06 19:34:08 mlarkin Exp $ */

/*
 * Copyright (c) 2001-2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
 *
 * 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/errno.h>
#include <sys/syscall.h>

#include <machine/param.h>
#include <machine/asm.h>
#include <machine/cpu.h>
#include <mips64/mips_cpu.h>
#include <machine/regnum.h>
#include <machine/cpustate.h>

#include "assym.h"

        .set    noreorder               # Noreorder is default style!

        .globl  locore_start
        .ent    locore_start, 0
locore_start:
        mfc0    v0, COP_0_STATUS_REG
        li      v1, ~SR_INT_ENAB
        and     v0, v1
        mtc0    v0, COP_0_STATUS_REG    # disable all interrupts

        mtc0    zero, COP_0_CAUSE_REG   # Clear soft interrupts

        /*
         * Initialize stack and call machine startup.
         */
        LA      t0, start - FRAMESZ(CF_SZ)
        PTR_S   ra, CF_RA_OFFS(t0)              # save pmon return address
        PTR_S   sp, 0(t0)                       # and stack
        move    sp, t0
        jal     mips_init                       # mips_init(argc, argv, envp,
        nop                                     #    callvec, esym)

        beqz    v0, 1f                          # upon failure, return to pmon
        nop

        PTR_S   zero, CF_RA_OFFS(sp)            # Zero out old ra for debugger
        move    sp, v0                          # switch to new stack
        jal     main                            # main(regs)
        move    a0, zero
        PANIC("Startup failed!")

1:      PTR_L   ra, CF_RA_OFFS(sp)
        PTR_L   sp, 0(sp)
        jr      ra
        nop
        .end    locore_start

#ifdef MULTIPROCESSOR

LEAF(hw_cpu_spinup_trampoline, 0)
        /* Disable interrupts. */
        mfc0    v0, COP_0_STATUS_REG
        li      v1, ~SR_INT_ENAB
        and     v0, v1
        mtc0    v0, COP_0_STATUS_REG

        /* Clear any pending soft interrupts. */
        mtc0    zero, COP_0_CAUSE_REG

        LA      t0, cpu_spinup_a0
        ld      a0, 0(t0)
        LA      t0, cpu_spinup_sp
        ld      sp, 0(t0)
        jal     hw_cpu_hatch
        nop
END(hw_cpu_spinup_trampoline)

LEAF(hw_getcurcpu, 0)
        GET_CPU_INFO(v0, v1)
        jr      ra
        nop
END(hw_getcurcpu)

LEAF(hw_setcurcpu, 0)
        dmtc0   a0, COP_0_ERROR_PC
        jr      ra
        nop
END(hw_setcurcpu)

#endif /* MULTIPROCESSOR */