114a43e69SBenjamin Herrenschmidt/* 214a43e69SBenjamin Herrenschmidt * PowerNV OPAL API wrappers 314a43e69SBenjamin Herrenschmidt * 414a43e69SBenjamin Herrenschmidt * Copyright 2011 IBM Corp. 514a43e69SBenjamin Herrenschmidt * 614a43e69SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 714a43e69SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 814a43e69SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 914a43e69SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 1014a43e69SBenjamin Herrenschmidt */ 1114a43e69SBenjamin Herrenschmidt 1258995a9aSAnton Blanchard#include <linux/jump_label.h> 1314a43e69SBenjamin Herrenschmidt#include <asm/ppc_asm.h> 1414a43e69SBenjamin Herrenschmidt#include <asm/hvcall.h> 1514a43e69SBenjamin Herrenschmidt#include <asm/asm-offsets.h> 1614a43e69SBenjamin Herrenschmidt#include <asm/opal.h> 17ec0c464cSChristophe Leroy#include <asm/asm-compat.h> 182c86cd18SChristophe Leroy#include <asm/feature-fixups.h> 19c49f6353SAnton Blanchard 20c49f6353SAnton Blanchard .section ".text" 21c49f6353SAnton Blanchard 22c49f6353SAnton Blanchard/* 2375d9fc7fSNicholas Piggin * r3-r10 - OPAL call arguments 2475d9fc7fSNicholas Piggin * STK_PARAM(R11) - OPAL opcode 2575d9fc7fSNicholas Piggin * STK_PARAM(R12) - MSR to restore 26c49f6353SAnton Blanchard */ 2775d9fc7fSNicholas Piggin_GLOBAL_TOC(__opal_call) 2875d9fc7fSNicholas Piggin mflr r0 2975d9fc7fSNicholas Piggin std r0,PPC_LR_STKOFF(r1) 3075d9fc7fSNicholas Piggin ld r12,STK_PARAM(R12)(r1) 3175d9fc7fSNicholas Piggin li r0,MSR_IR|MSR_DR|MSR_LE 3275d9fc7fSNicholas Piggin andc r12,r12,r0 3375d9fc7fSNicholas Piggin LOAD_REG_ADDR(r11, opal_return) 3475d9fc7fSNicholas Piggin mtlr r11 3575d9fc7fSNicholas Piggin LOAD_REG_ADDR(r11, opal) 3675d9fc7fSNicholas Piggin ld r2,0(r11) 3775d9fc7fSNicholas Piggin ld r11,8(r11) 3875d9fc7fSNicholas Piggin mtspr SPRN_HSRR0,r11 3975d9fc7fSNicholas Piggin mtspr SPRN_HSRR1,r12 4075d9fc7fSNicholas Piggin /* set token to r0 */ 4175d9fc7fSNicholas Piggin ld r0,STK_PARAM(R11)(r1) 4214a43e69SBenjamin Herrenschmidt hrfid 43ad0289e4SAnton Blanchardopal_return: 44be401b37SBenjamin Herrenschmidt /* 4575d9fc7fSNicholas Piggin * Restore MSR on OPAL return. The MSR is set to big-endian. 46be401b37SBenjamin Herrenschmidt */ 4775d9fc7fSNicholas Piggin#ifdef __BIG_ENDIAN__ 4875d9fc7fSNicholas Piggin ld r11,STK_PARAM(R12)(r1) 4975d9fc7fSNicholas Piggin mtmsrd r11 5075d9fc7fSNicholas Piggin#else 5175d9fc7fSNicholas Piggin /* Endian can only be switched with rfi, must byte reverse MSR load */ 5275d9fc7fSNicholas Piggin .short 0x4039 /* li r10,STK_PARAM(R12) */ 5375d9fc7fSNicholas Piggin .byte (STK_PARAM(R12) >> 8) & 0xff 5475d9fc7fSNicholas Piggin .byte STK_PARAM(R12) & 0xff 5514a43e69SBenjamin Herrenschmidt 5675d9fc7fSNicholas Piggin .long 0x280c6a7d /* ldbrx r11,r10,r1 */ 5775d9fc7fSNicholas Piggin .long 0x05009f42 /* bcl 20,31,$+4 */ 5875d9fc7fSNicholas Piggin .long 0xa602487d /* mflr r10 */ 5975d9fc7fSNicholas Piggin .long 0x14004a39 /* addi r10,r10,20 */ 6075d9fc7fSNicholas Piggin .long 0xa64b5a7d /* mthsrr0 r10 */ 6175d9fc7fSNicholas Piggin .long 0xa64b7b7d /* mthsrr1 r11 */ 6275d9fc7fSNicholas Piggin .long 0x2402004c /* hrfid */ 6375d9fc7fSNicholas Piggin#endif 6475d9fc7fSNicholas Piggin ld r2,PACATOC(r13) 6575d9fc7fSNicholas Piggin ld r0,PPC_LR_STKOFF(r1) 66c49f6353SAnton Blanchard mtlr r0 67c49f6353SAnton Blanchard blr 68