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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Brandon Bergren <bdragon@FreeBSD.org>
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <machine/asm.h>
/**
* int openfirmware_trampoline(void *buf, int (*cb)(void *));
*/
ASENTRY_NOPROF(openfirmware_trampoline)
mflr %r0
stw %r0, 4(%r1)
stwu %r1, -16(%r1)
stw %r30, 8(%r1)
/* Save current MSR for restoration post-call. */
mfmsr %r30
mr %r5, %r30
/* Remove LE bit from MSR. */
clrrwi %r5, %r5, 1
mtsrr0 %r4
mtsrr1 %r5
LOAD_LR_NIA
1:
mflr %r4
addi %r4, %r4, (2f - 1b)
mtlr %r4
/* Switch to BE and transfer control to OF entry */
rfid
2:
/* Control is returned here, but in BE. */
.long 0x05009f42 /* LOAD_LR_NIA */
/* 0: */
.long 0xa603db7f /* mtsrr1 %r30 */
.long 0xa602c87f /* mflr %r30 */
.long 0x1400de3b /* addi %r30, %r30, (1f - 0b) */
.long 0xa603da7f /* mtsrr0 %r30 */
.long 0x2400004c /* rfid */
/* 1: */
1:
/* Back to normal. Tidy up for return. */
lwz %r30, 8(%r1)
lwz %r0, 20(%r1)
addi %r1, %r1, 16
mtlr %r0
blr
ASEND(openfirmware_trampoline)
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