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-rw-r--r--arch/riscv/include/asm/alternative.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/alternative.h b/arch/riscv/include/asm/alternative.h
new file mode 100644
index 000000000..6511dd73e
--- /dev/null
+++ b/arch/riscv/include/asm/alternative.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2021 Sifive.
+ */
+
+#ifndef __ASM_ALTERNATIVE_H
+#define __ASM_ALTERNATIVE_H
+
+#define ERRATA_STRING_LENGTH_MAX 32
+
+#include <asm/alternative-macros.h>
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_RISCV_ALTERNATIVE
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <asm/hwcap.h>
+
+#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 */
+
+void __init apply_boot_alternatives(void);
+void __init apply_early_boot_alternatives(void);
+void apply_module_alternatives(void *start, size_t length);
+
+struct alt_entry {
+ void *old_ptr; /* address of original instruciton or data */
+ void *alt_ptr; /* address of replacement instruction or data */
+ unsigned long vendor_id; /* cpu vendor id */
+ unsigned long alt_len; /* The replacement size */
+ unsigned int errata_id; /* The errata id */
+} __packed;
+
+struct errata_checkfunc_id {
+ unsigned long vendor_id;
+ bool (*func)(struct alt_entry *alt);
+};
+
+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