mirror of
https://codeberg.org/ziglang/zig.git
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Alex Rønne Petersen
136 lines
4.3 KiB
C
Vendored
136 lines
4.3 KiB
C
Vendored
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 Arm Ltd
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _MACHINE_CPU_FEAT_H_
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#define _MACHINE_CPU_FEAT_H_
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#include <sys/linker_set.h>
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#include <sys/sysctl.h>
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typedef enum {
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ERRATA_UNKNOWN, /* Unknown erratum */
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ERRATA_NONE, /* No errata for this feature on this system. */
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ERRATA_AFFECTED, /* There is errata on this system. */
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ERRATA_FW_MITIGAION, /* There is errata, and a firmware */
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/* mitigation. The mitigation may need a */
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/* kernel component. */
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} cpu_feat_errata;
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typedef enum {
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/*
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* Don't implement the feature or erratum wrokarount,
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* e.g. the feature is not implemented or erratum is
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* for another CPU.
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*/
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FEAT_ALWAYS_DISABLE,
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/*
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* Disable by default, but allow the user to enable,
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* e.g. For a rare erratum with a workaround, Arm
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* Category B (rare) or similar.
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*/
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FEAT_DEFAULT_DISABLE,
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/*
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* Enabled by default, bit allow the user to disable,
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* e.g. For a common erratum with a workaround, Arm
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* Category A or B or similar.
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*/
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FEAT_DEFAULT_ENABLE,
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/* We could add FEAT_ALWAYS_ENABLE if a need was found. */
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} cpu_feat_en;
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#define CPU_FEAT_STAGE_MASK 0x00000001
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#define CPU_FEAT_EARLY_BOOT 0x00000000
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#define CPU_FEAT_AFTER_DEV 0x00000001
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#define CPU_FEAT_SCOPE_MASK 0x00000010
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#define CPU_FEAT_PER_CPU 0x00000000
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#define CPU_FEAT_SYSTEM 0x00000010
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#define CPU_FEAT_USER_ENABLED 0x40000000
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#define CPU_FEAT_USER_DISABLED 0x80000000
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struct cpu_feat;
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typedef cpu_feat_en (cpu_feat_check)(const struct cpu_feat *, u_int);
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typedef bool (cpu_feat_has_errata)(const struct cpu_feat *, u_int,
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u_int **, u_int *);
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typedef bool (cpu_feat_enable)(const struct cpu_feat *, cpu_feat_errata,
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u_int *, u_int);
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typedef void (cpu_feat_disabled)(const struct cpu_feat *);
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struct cpu_feat {
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const char *feat_name;
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cpu_feat_check *feat_check;
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cpu_feat_has_errata *feat_has_errata;
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cpu_feat_enable *feat_enable;
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cpu_feat_disabled *feat_disabled;
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uint32_t feat_flags;
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bool feat_enabled;
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};
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SET_DECLARE(cpu_feat_set, struct cpu_feat);
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SYSCTL_DECL(_hw_feat);
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#define CPU_FEAT(name, descr, check, has_errata, enable, disabled, flags) \
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static struct cpu_feat name = { \
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.feat_name = #name, \
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.feat_check = check, \
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.feat_has_errata = has_errata, \
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.feat_enable = enable, \
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.feat_disabled = disabled, \
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.feat_flags = flags, \
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.feat_enabled = false, \
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}; \
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DATA_SET(cpu_feat_set, name); \
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SYSCTL_BOOL(_hw_feat, OID_AUTO, name, CTLFLAG_RD, &name.feat_enabled, \
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0, descr)
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/*
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* Allow drivers to mark an erratum as worked around, e.g. the Errata
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* Management ABI may know the workaround isn't needed on a given system.
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*/
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typedef cpu_feat_errata (*cpu_feat_errata_check_fn)(const struct cpu_feat *,
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u_int);
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void cpu_feat_register_errata_check(cpu_feat_errata_check_fn);
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void enable_cpu_feat(uint32_t);
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/* Check if an erratum is in the list of errata */
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static inline bool
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cpu_feat_has_erratum(u_int *errata_list, u_int errata_count, u_int erratum)
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{
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for (u_int i = 0; i < errata_count; i++)
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if (errata_list[0] == erratum)
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return (true);
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return (false);
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}
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#endif /* _MACHINE_CPU_FEAT_H_ */ |