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a35707c3d8
Some current cpus based on T-Head cores implement memory-types way different than described in the svpbmt spec even going so far as using PTE bits marked as reserved. Add the T-Head vendor-id and necessary errata code to replace the affected instructions. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Samuel Holland <samuel@sholland.org> Link: https://lore.kernel.org/r/20220511192921.2223629-13-heiko@sntech.de Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Sifive.
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*/
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#ifndef __ASM_ALTERNATIVE_H
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#define __ASM_ALTERNATIVE_H
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#define ERRATA_STRING_LENGTH_MAX 32
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#include <asm/alternative-macros.h>
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_RISCV_ALTERNATIVE
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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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#include <asm/hwcap.h>
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#define RISCV_ALTERNATIVES_BOOT 0 /* alternatives applied during regular boot */
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#define RISCV_ALTERNATIVES_MODULE 1 /* alternatives applied during module-init */
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#define RISCV_ALTERNATIVES_EARLY_BOOT 2 /* alternatives applied before mmu start */
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void __init apply_boot_alternatives(void);
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void __init apply_early_boot_alternatives(void);
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void apply_module_alternatives(void *start, size_t length);
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struct alt_entry {
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void *old_ptr; /* address of original instruciton or data */
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void *alt_ptr; /* address of replacement instruction or data */
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unsigned long vendor_id; /* cpu vendor id */
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unsigned long alt_len; /* The replacement size */
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unsigned int errata_id; /* The errata id */
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} __packed;
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struct errata_checkfunc_id {
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unsigned long vendor_id;
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bool (*func)(struct alt_entry *alt);
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};
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void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
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unsigned long archid, unsigned long impid,
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unsigned int stage);
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void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
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unsigned long archid, unsigned long impid,
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unsigned int stage);
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void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end,
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unsigned int stage);
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#else /* CONFIG_RISCV_ALTERNATIVE */
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static inline void apply_boot_alternatives(void) { }
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static inline void apply_early_boot_alternatives(void) { }
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static inline void apply_module_alternatives(void *start, size_t length) { }
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#endif /* CONFIG_RISCV_ALTERNATIVE */
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#endif
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#endif
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