| /* 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 |
