include/asm/alternative.h

1 /* SPDX-License-Identifier: GPL-2.0 */
22  * Alternative inline assembly for SMP.
27  * SMP alternatives use the same data structures as the other
29  * UP system running a SMP kernel.  The existing apply_alternatives()
30  * works fine for patching a SMP kernel for UP.
32  * The SMP alternative tables can be kept after boot and contain both
33  * UP and SMP versions of the instructions to allow switching back to
34  * SMP at runtime, when hotplugging in a new CPU, which is especially
46 		".long 671f - .\n" /* offset */		\
78 	s32 repl_offset;	/* offset to replacement instruction */
159 #define alt_slen		"772b-771b"
160 #define alt_total_slen		"773b-771b"
161 #define alt_rlen		"775f-774f"
167 	".skip -(((" alt_rlen ")-(" alt_slen ")) > 0) * "		\
168 		"((" alt_rlen ")-(" alt_slen ")),0x90\n"		\
173 	" .long 771b - .\n"				/* label           */ \
174 	" .long 774f - .\n"				/* new instruction */ \
243  * constant expression with all syntax-specific punctuation omitted. %P
244  * is the x86-specific variant which can handle constants too, for
292 	     ".size " #func ", . - " #func "\n\t"	\
305 	.long 672b - .
331 	.long \orig - .
332 	.long \alt - .
352 	.skip -(((744f-743f)-(741b-740b)) > 0) * ((744f-743f)-(741b-740b)),0x90	;\
355 	altinstr_entry 740b,743f,flag,742b-740b,744f-743f ;		\
367 #define old_len			141b-140b
368 #define new_len1		144f-143f
369 #define new_len2		145f-144f
370 #define new_len3		146f-145f