/* SPDX-License-Identifier: GPL-2.0-or-later */
|
/*
|
* PowerNV OPAL API wrappers
|
*
|
* Copyright 2011 IBM Corp.
|
*/
|
|
#include <linux/jump_label.h>
|
#include <asm/ppc_asm.h>
|
#include <asm/hvcall.h>
|
#include <asm/asm-offsets.h>
|
#include <asm/opal.h>
|
#include <asm/asm-compat.h>
|
#include <asm/feature-fixups.h>
|
|
.section ".text"
|
|
/*
|
* r3-r10 - OPAL call arguments
|
* STK_PARAM(R11) - OPAL opcode
|
* STK_PARAM(R12) - MSR to restore
|
*/
|
_GLOBAL_TOC(__opal_call)
|
mflr r0
|
std r0,PPC_LR_STKOFF(r1)
|
ld r12,STK_PARAM(R12)(r1)
|
li r0,MSR_IR|MSR_DR|MSR_LE
|
andc r12,r12,r0
|
LOAD_REG_ADDR(r11, opal_return)
|
mtlr r11
|
LOAD_REG_ADDR(r11, opal)
|
ld r2,0(r11)
|
ld r11,8(r11)
|
mtspr SPRN_HSRR0,r11
|
mtspr SPRN_HSRR1,r12
|
/* set token to r0 */
|
ld r0,STK_PARAM(R11)(r1)
|
hrfid
|
opal_return:
|
/*
|
* Restore MSR on OPAL return. The MSR is set to big-endian.
|
*/
|
#ifdef __BIG_ENDIAN__
|
ld r11,STK_PARAM(R12)(r1)
|
mtmsrd r11
|
#else
|
/* Endian can only be switched with rfi, must byte reverse MSR load */
|
.short 0x4039 /* li r10,STK_PARAM(R12) */
|
.byte (STK_PARAM(R12) >> 8) & 0xff
|
.byte STK_PARAM(R12) & 0xff
|
|
.long 0x280c6a7d /* ldbrx r11,r10,r1 */
|
.long 0x05009f42 /* bcl 20,31,$+4 */
|
.long 0xa602487d /* mflr r10 */
|
.long 0x14004a39 /* addi r10,r10,20 */
|
.long 0xa64b5a7d /* mthsrr0 r10 */
|
.long 0xa64b7b7d /* mthsrr1 r11 */
|
.long 0x2402004c /* hrfid */
|
#endif
|
ld r2,PACATOC(r13)
|
ld r0,PPC_LR_STKOFF(r1)
|
mtlr r0
|
blr
|
