diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-wrappers.S')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-wrappers.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S new file mode 100644 index 000000000..e5acc33b3 --- /dev/null +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -0,0 +1,63 @@ +/* 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 + ld r2,PACATOC(r13) + ld r0,PPC_LR_STKOFF(r1) + mtlr r0 + blr |