167 lines
5.0 KiB
C
167 lines
5.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ALTERNATIVE_MACROS_H
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#define __ASM_ALTERNATIVE_MACROS_H
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#ifdef CONFIG_RISCV_ALTERNATIVE
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#ifdef __ASSEMBLY__
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.macro ALT_ENTRY oldptr newptr vendor_id errata_id new_len
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.4byte \oldptr - .
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.4byte \newptr - .
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.2byte \vendor_id
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.2byte \new_len
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.4byte \errata_id
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.endm
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.macro ALT_NEW_CONTENT vendor_id, errata_id, enable = 1, new_c : vararg
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.if \enable
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.pushsection .alternative, "a"
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ALT_ENTRY 886b, 888f, \vendor_id, \errata_id, 889f - 888f
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.popsection
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.subsection 1
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888 :
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.option push
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.option norvc
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.option norelax
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\new_c
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.option pop
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889 :
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.org . - (889b - 888b) + (887b - 886b)
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.org . - (887b - 886b) + (889b - 888b)
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.previous
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.endif
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.endm
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.macro ALTERNATIVE_CFG old_c, new_c, vendor_id, errata_id, enable
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886 :
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.option push
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.option norvc
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.option norelax
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\old_c
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.option pop
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887 :
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ALT_NEW_CONTENT \vendor_id, \errata_id, \enable, \new_c
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.endm
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.macro ALTERNATIVE_CFG_2 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
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new_c_2, vendor_id_2, errata_id_2, enable_2
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ALTERNATIVE_CFG "\old_c", "\new_c_1", \vendor_id_1, \errata_id_1, \enable_1
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ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2
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.endm
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#define __ALTERNATIVE_CFG(...) ALTERNATIVE_CFG __VA_ARGS__
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#define __ALTERNATIVE_CFG_2(...) ALTERNATIVE_CFG_2 __VA_ARGS__
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#else /* !__ASSEMBLY__ */
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#include <asm/asm.h>
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#include <linux/stringify.h>
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#define ALT_ENTRY(oldptr, newptr, vendor_id, errata_id, newlen) \
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".4byte ((" oldptr ") - .) \n" \
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".4byte ((" newptr ") - .) \n" \
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".2byte " vendor_id "\n" \
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".2byte " newlen "\n" \
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".4byte " errata_id "\n"
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#define ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c) \
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".if " __stringify(enable) " == 1\n" \
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".pushsection .alternative, \"a\"\n" \
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ALT_ENTRY("886b", "888f", __stringify(vendor_id), __stringify(errata_id), "889f - 888f") \
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".popsection\n" \
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".subsection 1\n" \
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"888 :\n" \
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".option push\n" \
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".option norvc\n" \
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".option norelax\n" \
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new_c "\n" \
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".option pop\n" \
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"889 :\n" \
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".org . - (887b - 886b) + (889b - 888b)\n" \
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".org . - (889b - 888b) + (887b - 886b)\n" \
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".previous\n" \
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".endif\n"
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#define __ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, enable) \
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"886 :\n" \
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".option push\n" \
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".option norvc\n" \
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".option norelax\n" \
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old_c "\n" \
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".option pop\n" \
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"887 :\n" \
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ALT_NEW_CONTENT(vendor_id, errata_id, enable, new_c)
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#define __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \
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new_c_2, vendor_id_2, errata_id_2, enable_2) \
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__ALTERNATIVE_CFG(old_c, new_c_1, vendor_id_1, errata_id_1, enable_1) \
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ALT_NEW_CONTENT(vendor_id_2, errata_id_2, enable_2, new_c_2)
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#endif /* __ASSEMBLY__ */
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#define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \
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__ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, IS_ENABLED(CONFIG_k))
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#define _ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
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new_c_2, vendor_id_2, errata_id_2, CONFIG_k_2) \
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__ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, IS_ENABLED(CONFIG_k_1), \
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new_c_2, vendor_id_2, errata_id_2, IS_ENABLED(CONFIG_k_2))
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#else /* CONFIG_RISCV_ALTERNATIVE */
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#ifdef __ASSEMBLY__
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.macro ALTERNATIVE_CFG old_c
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\old_c
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.endm
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#define _ALTERNATIVE_CFG(old_c, ...) \
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ALTERNATIVE_CFG old_c
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#define _ALTERNATIVE_CFG_2(old_c, ...) \
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ALTERNATIVE_CFG old_c
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#else /* !__ASSEMBLY__ */
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#define __ALTERNATIVE_CFG(old_c) \
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old_c "\n"
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#define _ALTERNATIVE_CFG(old_c, ...) \
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__ALTERNATIVE_CFG(old_c)
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#define _ALTERNATIVE_CFG_2(old_c, ...) \
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__ALTERNATIVE_CFG(old_c)
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_RISCV_ALTERNATIVE */
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/*
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* Usage:
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* ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k)
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* in the assembly code. Otherwise,
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* asm(ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k));
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*
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* old_content: The old content which is probably replaced with new content.
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* new_content: The new content.
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* vendor_id: The CPU vendor ID.
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* errata_id: The errata ID.
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* CONFIG_k: The Kconfig of this errata. When Kconfig is disabled, the old
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* content will alwyas be executed.
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*/
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#define ALTERNATIVE(old_content, new_content, vendor_id, errata_id, CONFIG_k) \
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_ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k)
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/*
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* A vendor wants to replace an old_content, but another vendor has used
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* ALTERNATIVE() to patch its customized content at the same location. In
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* this case, this vendor can create a new macro ALTERNATIVE_2() based
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* on the following sample code and then replace ALTERNATIVE() with
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* ALTERNATIVE_2() to append its customized content.
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*/
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#define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
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new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) \
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_ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \
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new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2)
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#endif
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