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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2021 Sifive.
*/
#ifndef __ASM_ALTERNATIVE_H
#define __ASM_ALTERNATIVE_H
#include <asm/alternative-macros.h>
#ifndef __ASSEMBLY__
#ifdef CONFIG_RISCV_ALTERNATIVE
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <asm/hwcap.h>
#define PATCH_ID_CPUFEATURE_ID(p) lower_16_bits(p)
#define PATCH_ID_CPUFEATURE_VALUE(p) upper_16_bits(p)
#define RISCV_ALTERNATIVES_BOOT 0 /* alternatives applied during regular boot */
#define RISCV_ALTERNATIVES_MODULE 1 /* alternatives applied during module-init */
#define RISCV_ALTERNATIVES_EARLY_BOOT 2 /* alternatives applied before mmu start */
/* add the relative offset to the address of the offset to get the absolute address */
#define __ALT_PTR(a, f) ((void *)&(a)->f + (a)->f)
#define ALT_OLD_PTR(a) __ALT_PTR(a, old_offset)
#define ALT_ALT_PTR(a) __ALT_PTR(a, alt_offset)
void __init apply_boot_alternatives(void);
void __init apply_early_boot_alternatives(void);
void apply_module_alternatives(void *start, size_t length);
void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
int patch_offset);
struct alt_entry {
s32 old_offset; /* offset relative to original instruction or data */
s32 alt_offset; /* offset relative to replacement instruction or data */
u16 vendor_id; /* CPU vendor ID */
u16 alt_len; /* The replacement size */
u32 patch_id; /* The patch ID (erratum ID or cpufeature ID) */
};
void andes_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid,
unsigned int stage);
void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid,
unsigned int stage);
void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid,
unsigned int stage);
void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned int stage);
#else /* CONFIG_RISCV_ALTERNATIVE */
static inline void apply_boot_alternatives(void) { }
static inline void apply_early_boot_alternatives(void) { }
static inline void apply_module_alternatives(void *start, size_t length) { }
#endif /* CONFIG_RISCV_ALTERNATIVE */
#endif
#endif
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