1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2021 Sifive. 4 */ 5 6 #ifndef __ASM_ALTERNATIVE_H 7 #define __ASM_ALTERNATIVE_H 8 9 #define ERRATA_STRING_LENGTH_MAX 32 10 11 #include <asm/alternative-macros.h> 12 13 #ifndef __ASSEMBLY__ 14 15 #ifdef CONFIG_RISCV_ALTERNATIVE 16 17 #include <linux/init.h> 18 #include <linux/types.h> 19 #include <linux/stddef.h> 20 #include <asm/hwcap.h> 21 22 void __init apply_boot_alternatives(void); 23 24 struct alt_entry { 25 void *old_ptr; /* address of original instruciton or data */ 26 void *alt_ptr; /* address of replacement instruction or data */ 27 unsigned long vendor_id; /* cpu vendor id */ 28 unsigned long alt_len; /* The replacement size */ 29 unsigned int errata_id; /* The errata id */ 30 } __packed; 31 32 struct errata_checkfunc_id { 33 unsigned long vendor_id; 34 bool (*func)(struct alt_entry *alt); 35 }; 36 37 void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end, 38 unsigned long archid, unsigned long impid); 39 40 #else /* CONFIG_RISCV_ALTERNATIVE */ 41 42 static inline void apply_boot_alternatives(void) { } 43 44 #endif /* CONFIG_RISCV_ALTERNATIVE */ 45 46 #endif 47 #endif 48