diff options
| author | Heiko Stuebner <heiko@sntech.de> | 2022-05-11 21:29:21 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-05-11 21:36:33 -0700 |
| commit | a35707c3d850dda0ceefb75b1b3bd191921d5765 (patch) | |
| tree | 00188dae0c8c04eabd08b304924d1d84c92acbd1 /arch/riscv/include/asm/alternative.h | |
| parent | 1745cfafebdfb017f6871c80f9894910a76373a4 (diff) | |
riscv: add memory-type errata for T-Head
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>
Diffstat (limited to 'arch/riscv/include/asm/alternative.h')
| -rw-r--r-- | arch/riscv/include/asm/alternative.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/alternative.h b/arch/riscv/include/asm/alternative.h index 64936356c37c..6511dd73e812 100644 --- a/arch/riscv/include/asm/alternative.h +++ b/arch/riscv/include/asm/alternative.h @@ -21,8 +21,10 @@ #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 { @@ -41,6 +43,9 @@ struct errata_checkfunc_id { 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); @@ -48,6 +53,7 @@ void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end, #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 */ |