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66 lines
1.4 KiB
66 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef _ASM_POWERPC_JUMP_LABEL_H |
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#define _ASM_POWERPC_JUMP_LABEL_H |
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/* |
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* Copyright 2010 Michael Ellerman, IBM Corp. |
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*/ |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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#include <asm/feature-fixups.h> |
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#include <asm/asm-const.h> |
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#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) |
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#define JUMP_LABEL_NOP_SIZE 4 |
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static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
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{ |
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asm_volatile_goto("1:\n\t" |
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"nop # arch_static_branch\n\t" |
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".pushsection __jump_table, \"aw\"\n\t" |
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JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" |
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".popsection \n\t" |
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: : "i" (&((char *)key)[branch]) : : l_yes); |
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return false; |
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l_yes: |
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return true; |
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} |
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static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) |
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{ |
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asm_volatile_goto("1:\n\t" |
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"b %l[l_yes] # arch_static_branch_jump\n\t" |
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".pushsection __jump_table, \"aw\"\n\t" |
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JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" |
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".popsection \n\t" |
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: : "i" (&((char *)key)[branch]) : : l_yes); |
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return false; |
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l_yes: |
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return true; |
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} |
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#ifdef CONFIG_PPC64 |
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typedef u64 jump_label_t; |
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#else |
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typedef u32 jump_label_t; |
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#endif |
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struct jump_entry { |
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jump_label_t code; |
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jump_label_t target; |
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jump_label_t key; |
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}; |
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#else |
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#define ARCH_STATIC_BRANCH(LABEL, KEY) \ |
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1098: nop; \ |
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.pushsection __jump_table, "aw"; \ |
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FTR_ENTRY_LONG 1098b, LABEL, KEY; \ |
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.popsection |
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#endif |
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#endif /* _ASM_POWERPC_JUMP_LABEL_H */
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