/* 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
LOAD_PACA_TOC()
ld r0,PPC_LR_STKOFF(r1)
mtlr r0
blr
Codebase Browser
linux