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asm/alternative.h contains both the macros needed to use alternatives, as well the type definitions and function prototypes for applying them. Split the header in two, so that alternatives can be used from core header files such as linux/compiler.h without the risk of circular includes Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
36 lines
1013 B
C
36 lines
1013 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ALTERNATIVE_H
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#define __ASM_ALTERNATIVE_H
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#include <asm/alternative-macros.h>
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#ifndef __ASSEMBLY__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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struct alt_instr {
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s32 orig_offset; /* offset to original instruction */
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s32 alt_offset; /* offset to replacement instruction */
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u16 cpufeature; /* cpufeature bit set for replacement */
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u8 orig_len; /* size of original instruction(s) */
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u8 alt_len; /* size of new instruction(s), <= orig_len */
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};
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typedef void (*alternative_cb_t)(struct alt_instr *alt,
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__le32 *origptr, __le32 *updptr, int nr_inst);
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void __init apply_boot_alternatives(void);
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void __init apply_alternatives_all(void);
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bool alternative_is_applied(u16 cpufeature);
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#ifdef CONFIG_MODULES
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void apply_alternatives_module(void *start, size_t length);
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#else
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static inline void apply_alternatives_module(void *start, size_t length) { }
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_ALTERNATIVE_H */
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