source: mainline/arch/sparc64/loader/asm.S@ 2e672fd

#
# Copyright (C) 2006 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - 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.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# 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.
#

#define STACK_WINDOW_SAVE_AREA_SIZE     (16*8)

#define PSTATE_AM_BIT   8

.text

.global halt
.global memcpy
.global jump_to_kernel

halt:
        b halt
        nop
        
memcpy:
        .register       %g2, #scratch
        .register       %g3, #scratch
        add     %o1, 7, %g1
        and     %g1, -8, %g1
        cmp     %o1, %g1
        be,pn   %xcc, 3f
        add     %o0, 7, %g1
        mov     0, %g3
0:
        brz,pn  %o2, 2f
        mov     0, %g2
1:
        ldub    [%g3 + %o1], %g1
        add     %g2, 1, %g2
        cmp     %o2, %g2
        stb     %g1, [%g3 + %o0]
        bne,pt  %xcc, 1b
        mov     %g2, %g3
2:
        jmp     %o7 + 8                 ! exit point
        mov     %o1, %o0
3:
        and     %g1, -8, %g1
        cmp     %o0, %g1
        bne,pt  %xcc, 0b
        mov     0, %g3
        srlx    %o2, 3, %g4
        brz,pn  %g4, 5f
        mov     0, %g5
4:
        sllx    %g3, 3, %g2
        add     %g5, 1, %g3
        ldx     [%o1 + %g2], %g1
        mov     %g3, %g5
        cmp     %g4, %g3
        bne,pt  %xcc, 4b
        stx     %g1, [%o0 + %g2]
5:
        and     %o2, 7, %o2
        brz,pn  %o2, 2b
        sllx    %g4, 3, %g1
        mov     0, %g2
        add     %g1, %o0, %o0
        add     %g1, %o1, %g4
        mov     0, %g3
6:
        ldub    [%g2 + %g4], %g1
        stb     %g1, [%g2 + %o0]
        add     %g3, 1, %g2
        cmp     %o2, %g2
        bne,pt  %xcc, 6b
        mov     %g2, %g3

        jmp     %o7 + 8                 ! exit point
        mov     %o1, %o0

jump_to_kernel:
        set ofw_cif, %l0
        jmp %o0                         ! jump to kernel
        ldx [%l0], %o4                  ! pass OpenFirmware address in %o4

.global ofw
ofw:
        save %sp, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
        set ofw_cif, %l0
        ldx [%l0], %l0

        rdpr  %pstate, %l1
        and  %l1, ~PSTATE_AM_BIT, %l2
        wrpr  %l2, 0, %pstate
    
        jmpl %l0, %o7
        mov %i0, %o0

        wrpr %l1, 0, %pstate

        ret
        restore %o0, 0, %o0