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