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Diffstat (limited to 'sys/arm64/include/cpu_feat.h')
| -rw-r--r-- | sys/arm64/include/cpu_feat.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sys/arm64/include/cpu_feat.h b/sys/arm64/include/cpu_feat.h new file mode 100644 index 000000000000..9fe6a9dd95d9 --- /dev/null +++ b/sys/arm64/include/cpu_feat.h @@ -0,0 +1,88 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2024 Arm Ltd + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef _MACHINE_CPU_FEAT_H_ +#define _MACHINE_CPU_FEAT_H_ + +#include <sys/linker_set.h> + +typedef enum { + ERRATA_UNKNOWN, /* Unknown erratum */ + ERRATA_NONE, /* No errata for this feature on this system. */ + ERRATA_AFFECTED, /* There is errata on this system. */ + ERRATA_FW_MITIGAION, /* There is errata, and a firmware */ + /* mitigation. The mitigation may need a */ + /* kernel component. */ +} cpu_feat_errata; + +#define CPU_FEAT_STAGE_MASK 0x00000001 +#define CPU_FEAT_EARLY_BOOT 0x00000000 +#define CPU_FEAT_AFTER_DEV 0x00000001 + +#define CPU_FEAT_SCOPE_MASK 0x00000010 +#define CPU_FEAT_PER_CPU 0x00000000 +#define CPU_FEAT_SYSTEM 0x00000010 + +struct cpu_feat; + +typedef bool (cpu_feat_check)(const struct cpu_feat *, u_int); +typedef bool (cpu_feat_has_errata)(const struct cpu_feat *, u_int, + u_int **, u_int *); +typedef void (cpu_feat_enable)(const struct cpu_feat *, cpu_feat_errata, + u_int *, u_int); + +struct cpu_feat { + const char *feat_name; + cpu_feat_check *feat_check; + cpu_feat_has_errata *feat_has_errata; + cpu_feat_enable *feat_enable; + uint32_t feat_flags; +}; +SET_DECLARE(cpu_feat_set, struct cpu_feat); + +/* + * Allow drivers to mark an erratum as worked around, e.g. the Errata + * Management ABI may know the workaround isn't needed on a given system. + */ +typedef cpu_feat_errata (*cpu_feat_errata_check_fn)(const struct cpu_feat *, + u_int); +void cpu_feat_register_errata_check(cpu_feat_errata_check_fn); + +void enable_cpu_feat(uint32_t); + +/* Check if an erratum is in the list of errata */ +static inline bool +cpu_feat_has_erratum(u_int *errata_list, u_int errata_count, u_int erratum) +{ + for (u_int i = 0; i < errata_count; i++) + if (errata_list[0] == erratum) + return (true); + + return (false); +} + +#endif /* _MACHINE_CPU_FEAT_H_ */ |