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8d23e94a44
Instead of using absolute addresses for both the old instrucions and the alternative instructions, use offsets relative to the alt_entry values. So this not only cuts the size of the alternative entry, but also meets the prerequisite for patching alternatives in the vDSO, since absolute alternative entries are subject to dynamic relocation, which is incompatible with the vDSO building. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230128172856.3814-10-jszhang@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
71 lines
2.1 KiB
C
71 lines
2.1 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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/* add the relative offset to the address of the offset to get the absolute address */
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#define __ALT_PTR(a, f) ((void *)&(a)->f + (a)->f)
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#define ALT_OLD_PTR(a) __ALT_PTR(a, old_offset)
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#define ALT_ALT_PTR(a) __ALT_PTR(a, alt_offset)
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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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void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
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int patch_offset);
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struct alt_entry {
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s32 old_offset; /* offset relative to original instruction or data */
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s32 alt_offset; /* offset relative to replacement instruction or data */
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u16 vendor_id; /* cpu vendor id */
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u16 alt_len; /* The replacement size */
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u32 errata_id; /* The errata id */
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};
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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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