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/* Copyright 2013-2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
Test the SRESET OPAL call in Mambo by
having a bit of fun printing 'Hello World' from the SRESET vector.
*/
. = 0x0
.globl _start
_start:
/*
* Save some values passed in from skiboot into registers that are
* non-volatile over OPAL calls.
* r8 is the OPAL base
* r9 is the OPAL entry point point
*/
mr %r13, %r8
mr %r14, %r9
bl here
here: mflr %r8 /* work out where we are running */
subi %r8, %r8, here - _start
/* Stash OPAL base and entry point somewhere SRESET can find it */
li %r6, 0xe0
std %r13, 0(%r6)
std %r14, 8(%r6)
std %r8, 16(%r6)
addi %r6, %r8, sreset_code_end - _start
addi %r7, %r8, sreset_code - _start
li %r10, 0x100
c:
lwa %r9, 0(%r7)
stw %r9, 0(%r10)
addi %r7,%r7,4
addi %r10,%r10,4
cmpd %r7,%r6
bne c
sync
icbi 0,%r0
sync
isync
li %r0, 1 /* OPAL_CONSOLE_WRITE */
li %r3, 0 /* terminal 0 */
addi %r4, %r8, len - _start /* ptr to length of string */
addi %r5, %r8, str - _start /* ptr to string start */
mr %r2, %r13
mtctr %r14
bctrl
li %r0, 145 /* OPAL_SIGNAL_SYSTEM_RESET */
li %r3, -2 /* All *OTHER* CPUs */
mr %r2, %r13
mtctr %r14
bctrl
/* We shouldn't get here but if we do, just wait here */
b .
sreset_code:
li %r6, 0xe0
ld %r13, 0(%r6)
ld %r14, 8(%r6)
ld %r8, 16(%r6) /* "here" */
li %r0, 1 /* OPAL_CONSOLE_WRITE */
li %r3, 0 /* terminal 0 */
li %r4, len2 - _start
li %r5, str2 - _start
add %r4, %r8, %r4
add %r5, %r8, %r5
mr %r2, %r13
mtctr %r14
bctrl
li %r0, 5 /* OPAL_CEC_POWER_DOWN */
li %r3, 0 /* normal shutdown */
mr %r2, %r13
mtctr %r14
bctrl
/* We shouldn't get here but if we do, just wait here */
b .
sreset_code_end:
len:
.long 0x00
.long (strend - str)
str:
.string "Hello World!\n"
strend:
len2:
.long 0x00
.long (str2end - str2)
str2:
.string "Hello SRESET!\n"
str2end:
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