1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * PowerNV OPAL API wrappers 4 * 5 * Copyright 2011 IBM Corp. 6 */ 7 8 #include <linux/jump_label.h> 9 #include <asm/ppc_asm.h> 10 #include <asm/hvcall.h> 11 #include <asm/asm-offsets.h> 12 #include <asm/opal.h> 13 #include <asm/asm-compat.h> 14 #include <asm/feature-fixups.h> 15 16 .section ".text" 17 18 /* 19 * r3-r10 - OPAL call arguments 20 * STK_PARAM(R11) - OPAL opcode 21 * STK_PARAM(R12) - MSR to restore 22 */ 23 _GLOBAL_TOC(__opal_call) 24 mflr r0 25 std r0,PPC_LR_STKOFF(r1) 26 ld r12,STK_PARAM(R12)(r1) 27 li r0,MSR_IR|MSR_DR|MSR_LE 28 andc r12,r12,r0 29 LOAD_REG_ADDR(r11, opal_return) 30 mtlr r11 31 LOAD_REG_ADDR(r11, opal) 32 ld r2,0(r11) 33 ld r11,8(r11) 34 mtspr SPRN_HSRR0,r11 35 mtspr SPRN_HSRR1,r12 36 /* set token to r0 */ 37 ld r0,STK_PARAM(R11)(r1) 38 hrfid 39 opal_return: 40 /* 41 * Restore MSR on OPAL return. The MSR is set to big-endian. 42 */ 43 #ifdef __BIG_ENDIAN__ 44 ld r11,STK_PARAM(R12)(r1) 45 mtmsrd r11 46 #else 47 /* Endian can only be switched with rfi, must byte reverse MSR load */ 48 .short 0x4039 /* li r10,STK_PARAM(R12) */ 49 .byte (STK_PARAM(R12) >> 8) & 0xff 50 .byte STK_PARAM(R12) & 0xff 51 52 .long 0x280c6a7d /* ldbrx r11,r10,r1 */ 53 .long 0x05009f42 /* bcl 20,31,$+4 */ 54 .long 0xa602487d /* mflr r10 */ 55 .long 0x14004a39 /* addi r10,r10,20 */ 56 .long 0xa64b5a7d /* mthsrr0 r10 */ 57 .long 0xa64b7b7d /* mthsrr1 r11 */ 58 .long 0x2402004c /* hrfid */ 59 #endif 60 ld r2,PACATOC(r13) 61 ld r0,PPC_LR_STKOFF(r1) 62 mtlr r0 63 blr 64