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142 lines
4.5 KiB
142 lines
4.5 KiB
/* 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_ERRATA_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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RISCV_PTR \oldptr |
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RISCV_PTR \newptr |
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REG_ASM \vendor_id |
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REG_ASM \new_len |
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.word \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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\new_c |
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889 : |
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.previous |
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.org . - (889b - 888b) + (887b - 886b) |
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.org . - (887b - 886b) + (889b - 888b) |
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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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\old_c |
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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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#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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#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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RISCV_PTR " " oldptr "\n" \ |
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RISCV_PTR " " newptr "\n" \ |
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REG_ASM " " vendor_id "\n" \ |
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REG_ASM " " newlen "\n" \ |
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".word " 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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new_c "\n" \ |
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"889 :\n" \ |
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".previous\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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".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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old_c "\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(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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#endif /* __ASSEMBLY__ */ |
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#else /* !CONFIG_RISCV_ERRATA_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, new_c, vendor_id, errata_id, CONFIG_k) \ |
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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, new_c, vendor_id, errata_id, CONFIG_k) \ |
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__ALTERNATIVE_CFG(old_c) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* CONFIG_RISCV_ERRATA_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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* .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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* 886 : |
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* \old_c |
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* 887 : |
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* ALT_NEW_CONTENT \vendor_id_1, \errata_id_1, \enable_1, \new_c_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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* |
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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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* |
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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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* |
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*/ |
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#endif
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