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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/* Copyright 2013-2019 IBM Corp. */
#ifndef __ASM_UTILS_H
#define __ASM_UTILS_H
/*
* Do NOT use the immediate load helpers with symbols
* only with constants. Symbols will _not_ be resolved
* by the linker since we are building -pie, and will
* instead generate relocs of a type our little built-in
* relocator can't handle
*/
/* Load an immediate 64-bit value into a register */
#define LOAD_IMM64(r, e) \
lis r,(e)@highest; \
ori r,r,(e)@higher; \
rldicr r,r, 32, 31; \
oris r,r, (e)@h; \
ori r,r, (e)@l;
/* Load an immediate 32-bit value into a register */
#define LOAD_IMM32(r, e) \
lis r,(e)@h; \
ori r,r,(e)@l;
/* Load an address via the TOC */
#define LOAD_ADDR_FROM_TOC(r, e) ld r,e@got(%r2)
/* This must preserve LR, may only clobber r11-r12, so can't use Linux kernel's
* FIXUP_ENDIAN */
#define SWITCH_ENDIAN \
.long 0xa600607d; /* mfmsr r11 */ \
.long 0x01006b69; /* xori r11,r11,1 */ \
.long 0xa64b7b7d; /* mthsrr1 r11 */ \
.long 0xa602687d; /* mflr r11 */ \
.long 0x05009f42; /* bcl 20,31,$+4 */ \
.long 0xa602887d; /* mflr r12 */ \
.long 0x14008c39; /* addi r12,r12,20 */ \
.long 0xa64b9a7d; /* mthsrr0 r12 */ \
.long 0xa603687d; /* mtlr r11 */ \
.long 0x2402004c /* hrfid */
#define FIXUP_ENDIAN \
tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
b 191f; /* Skip trampoline if endian is good */ \
SWITCH_ENDIAN; /* Do the switch */ \
191:
#if HAVE_BIG_ENDIAN
#define OPAL_ENTRY_TO_SKIBOOT_ENDIAN
#else
#define OPAL_ENTRY_TO_SKIBOOT_ENDIAN SWITCH_ENDIAN
#endif
#endif /* __ASM_UTILS_H */
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